feat: bug fixes, basic set of tests

Reviewed-on: https://gitea.homework.zip/shinya/Knihovna/pulls/1

.gitignore

@@ -1,3 +1,5 @@
+*.sqlite
+*.sln
 ## Ignore Visual Studio temporary files, build results, and
 ## files generated by popular Visual Studio add-ons.
 ##

Database.cs

@@ -0,0 +1,53 @@
+using System.Data;
+using Microsoft.Data.Sqlite;
+
+namespace Database
+{
+    public class Database
+    {
+        public static void CreateDatabaseQuery(SqliteConnection conn)
+        {
+			string createTableQuery = @"
+				CREATE TABLE [Books] (
+				    [ID] INTEGER PRIMARY KEY AUTOINCREMENT,
+				    [Name] TEXT NOT NULL,
+				    [YearOfRelease] INTEGER,
+				    [Total] INTEGER,
+				    [Available] INTEGER,
+				    [AuthorID] INTEGER,
+				    [PublisherID] INTEGER,
+				    FOREIGN KEY ([AuthorID]) REFERENCES [Authors]([ID]),
+				    FOREIGN KEY ([PublisherID]) REFERENCES [Publisher]([ID])
+				);
+				CREATE TABLE [Authors] (
+				    [ID] INTEGER PRIMARY KEY AUTOINCREMENT,
+				    [Name] TEXT,
+				    [Surname] TEXT,
+				    [DateOfBirth] DATE
+				);
+				CREATE TABLE [Publisher] (
+				    [ID] INTEGER PRIMARY KEY AUTOINCREMENT,
+				    [Name] TEXT,
+				    [State] TEXT
+				);
+				CREATE TABLE [Borrows] (
+				    [ID] INTEGER PRIMARY KEY AUTOINCREMENT,
+				    [DateOfBorrow] DATE,
+				    [DateOfReturn] DATE,
+				    [ReturnDue] DATE,
+				    [UserID] INTEGER,
+				    [BookID] INTEGER,
+				    FOREIGN KEY ([UserID]) REFERENCES [Users]([ID]),
+				    FOREIGN KEY ([BookID]) REFERENCES [Books]([ID])
+				);
+				CREATE TABLE [Users] (
+				    [ID] INTEGER PRIMARY KEY AUTOINCREMENT,
+				    [Name] TEXT,
+				    [Surname] TEXT
+				);";
+			SqliteCommand command = conn.CreateCommand();
+			command.CommandText = createTableQuery;
+			command.ExecuteNonQuery();
+        }
+    }
+}

Dockerfile

@@ -0,0 +1,16 @@
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build-env
+
+WORKDIR /app
+
+COPY *.csproj ./
+
+RUN dotnet restore
+
+RUN dotnet add package Microsoft.Data.Sqlite
+
+COPY . ./
+
+RUN dotnet build --configuration Debug
+
+CMD ["bash"]
+

Knihovna

@@ -0,0 +1 @@
+Subproject commit 9398c1a6de28adf3b2e7b9c41119a5d12c6488da

Knihovna.csproj

@@ -7,4 +7,12 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <Compile Remove="Normalizace/**/*.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Data.Sqlite" Version="9.0.10" />
+  </ItemGroup>
+
 </Project>

Normalizace/Normalizace.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Data.Sqlite" Version="9.0.9" />
+  </ItemGroup>
+
+</Project>

Normalizace/Program.cs

@@ -0,0 +1,102 @@
+using System;
+using Microsoft.Data.Sqlite;
+
+class Program
+{
+    static void Main()
+    {
+        using var conn = new SqliteConnection("Data Source=students.db;");
+        conn.Open();
+
+        void Exec(string sql)
+        {
+            using var cmd = conn.CreateCommand();
+            cmd.CommandText = sql;
+            cmd.ExecuteNonQuery();
+        }
+
+        // --- DDL + data (vložit SQL bloky z části #2) ---
+        Exec(@"
+PRAGMA foreign_keys = ON;
+DROP TABLE IF EXISTS StudentChoice; DROP TABLE IF EXISTS Friendship;
+DROP TABLE IF EXISTS Subject; DROP TABLE IF EXISTS Student;
+
+CREATE TABLE Student (id INTEGER PRIMARY KEY, full_name TEXT NOT NULL, abbrev TEXT);
+CREATE TABLE Subject (id INTEGER PRIMARY KEY, code TEXT NOT NULL UNIQUE, name TEXT NOT NULL);
+CREATE TABLE Friendship (student_id INTEGER NOT NULL, friend_id INTEGER NOT NULL,
+  PRIMARY KEY(student_id, friend_id),
+  FOREIGN KEY (student_id) REFERENCES Student(id) ON DELETE CASCADE,
+  FOREIGN KEY (friend_id)  REFERENCES Student(id) ON DELETE CASCADE);
+CREATE TABLE StudentChoice (student_id INTEGER NOT NULL, pref_order INTEGER NOT NULL CHECK(pref_order IN (1,2)),
+  subject_id INTEGER NOT NULL,
+  PRIMARY KEY(student_id, pref_order),
+  FOREIGN KEY (student_id) REFERENCES Student(id) ON DELETE CASCADE,
+  FOREIGN KEY (subject_id) REFERENCES Subject(id) ON DELETE RESTRICT);
+
+INSERT INTO Student (id, full_name, abbrev) VALUES
+(1,'Petr Zahradil','Za'),
+(2,'Antonín Neužil','Ne'),
+(3,'Eva Kárná','Ka'),
+(4,'Pavel Troup','Tr'),
+(5,'Jan Zavadil','Za'),
+(6,'Irina Kornienko','Ko'),
+(7,'Sabina Křížová','Kr');
+
+INSERT INTO Subject (id, code, name) VALUES
+(1,'MA','Matematika'),(2,'DEJ','Dějepis'),(3,'ANG','Angličtina'),
+(4,'TV','Tělesná výchova'),(5,'OS','Operační systémy'),
+(6,'NET','Počítačové sítě'),(7,'PRG','Programování');
+
+INSERT INTO Friendship VALUES
+(1,2),(1,3),(2,6),(2,7),(3,4),(3,1),(4,3),(4,1),(5,1),(5,3),(6,4),(6,2),(6,3),(7,2),(7,3);
+
+INSERT INTO StudentChoice VALUES
+(1,1,1),(1,2,2),
+(2,1,3),(2,2,4),
+(3,1,5),(3,2,1),
+(4,1,5),(4,2,6),
+(5,1,7),(5,2,3),
+(6,1,7),(6,2,4),
+(7,1,7),(7,2,5);
+");
+
+        string sql = @"
+WITH FriendsAgg AS (
+  SELECT f.student_id, GROUP_CONCAT(s2.abbrev, ', ') AS friends_abbrev
+  FROM Friendship f
+  JOIN Student s2 ON s2.id = f.friend_id
+  GROUP BY f.student_id
+),
+Choices AS (
+  SELECT
+    sc.student_id,
+    MAX(CASE WHEN sc.pref_order=1 THEN sub.code END) AS VolitPr1,
+    MAX(CASE WHEN sc.pref_order=2 THEN sub.code END) AS VolitPr2
+  FROM StudentChoice sc
+  JOIN Subject sub ON sub.id = sc.subject_id
+  GROUP BY sc.student_id
+)
+SELECT
+  s.full_name   AS Jmeno,
+  s.abbrev      AS Zkratka,
+  IFNULL(fa.friends_abbrev,'') AS Pratele,
+  c.VolitPr1,
+  c.VolitPr2
+FROM Student s
+LEFT JOIN FriendsAgg fa ON fa.student_id = s.id
+LEFT JOIN Choices   c  ON c.student_id  = s.id
+ORDER BY s.id;";
+
+using var cmd2 = conn.CreateCommand();
+cmd2.CommandText = sql;
+using var rdr = cmd2.ExecuteReader();
+
+Console.WriteLine("Jméno | Zkratka | Přátelé | VolitPr1 | VolitPr2");
+while (rdr.Read())
+{
+    Console.WriteLine(
+        $"{rdr.GetString(0)} | {rdr.GetString(1)} | {rdr.GetString(2)} | {rdr.GetString(3)} | {rdr.GetString(4)}"
+    );
+}
+    }
+}

Normalizace/bin/Debug/net9.0/Normalizace.deps.json

@@ -0,0 +1,237 @@
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+  "runtimeTarget": {
+    "name": ".NETCoreApp,Version=v9.0",
+    "signature": ""
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+  "targets": {
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+        "dependencies": {
+          "Microsoft.Data.Sqlite": "9.0.9"
+        },
+        "runtime": {
+          "Normalizace.dll": {}
+        }
+      },
+      "Microsoft.Data.Sqlite/9.0.9": {
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+        }
+      },
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+        "dependencies": {
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+            "fileVersion": "9.0.925.41909"
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Normalizace/bin/Debug/net9.0/Normalizace.runtimeconfig.json

@@ -0,0 +1,12 @@
+{
+  "runtimeOptions": {
+    "tfm": "net9.0",
+    "framework": {
+      "name": "Microsoft.NETCore.App",
+      "version": "9.0.0"
+    },
+    "configProperties": {
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
+    }
+  }
+}

Normalizace/obj/Debug/net9.0/.NETCoreApp,Version=v9.0.AssemblyAttributes.cs

@@ -0,0 +1,4 @@
+// <autogenerated />
+using System;
+using System.Reflection;
+[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETCoreApp,Version=v9.0", FrameworkDisplayName = ".NET 9.0")]

Normalizace/obj/Debug/net9.0/Normalizace.AssemblyInfo.cs

@@ -0,0 +1,22 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: System.Reflection.AssemblyCompanyAttribute("Normalizace")]
+[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
+[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0")]
+[assembly: System.Reflection.AssemblyProductAttribute("Normalizace")]
+[assembly: System.Reflection.AssemblyTitleAttribute("Normalizace")]
+[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
+
+// Generated by the MSBuild WriteCodeFragment class.
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Normalizace/obj/Debug/net9.0/Normalizace.GeneratedMSBuildEditorConfig.editorconfig

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+build_property.RootNamespace = Normalizace
+build_property.ProjectDir = /Users/hodan/Docs/Coding/ssps/ostrece/Normalizace/
+build_property.EnableComHosting = 
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+build_property.EffectiveAnalysisLevelStyle = 9.0
+build_property.EnableCodeStyleSeverity = 

Normalizace/obj/Debug/net9.0/Normalizace.GlobalUsings.g.cs

@@ -0,0 +1,8 @@
+// <auto-generated/>
+global using global::System;
+global using global::System.Collections.Generic;
+global using global::System.IO;
+global using global::System.Linq;
+global using global::System.Net.Http;
+global using global::System.Threading;
+global using global::System.Threading.Tasks;

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Normalizace/obj/Debug/net9.0/Normalizace.csproj.FileListAbsolute.txt

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Program.cs

@@ -1,3 +1,23 @@
-// See https://aka.ms/new-console-template for more information
-Console.WriteLine("Hello, World!");
-Console.WriteLine("Test");
+using System;
+using Microsoft.Data.Sqlite;
+using Database.Dto;
+using Team1;        // Team 1
+using Team2;        // Team 2
+using Team3;        // Team 3
+using Team4;        // Team 4
+
+
+public class Program
+{
+	public static void Main()
+	{
+		try
+		{
+			Tests.TestRunner.RunAll();
+		}
+		catch (SqliteException ex)
+		{
+			Console.WriteLine($"{ex.Source}: {ex.Message}");
+		}
+	}
+}

README.md

@@ -1,5 +1,116 @@
 # Knihovna
 
+## Struktura projektu
+
+Projekt je organizován do několika klíčových částí:
+
+```shell
+Knihovna/
+│
+├── src/ # Zdrojové soubory – zde bude vaše implementace
+│ ├── Funkce1.cs
+│ ├── Funkce2.cs
+│ └── ...
+│
+├── Database.cs # Definice databázových tabulek a datových modelů
+│
+├── Program.cs # Hlavní vstupní bod programu (spuštění aplikace)
+│
+└── docs/ # Dokumentace a zadání pro jednotlivé týmy
+├── TymA.md
+├── TymB.md
+└── ...
+```
+
+---
+
+## Popis hlavních souborů
+
+### `./src/`
+
+- každý tým implementuje své funkce **v samostatném souboru**, abychom se vyhnuli git konfliktům
+- Například funkci pro vyhledávání knih uložte do souboru `VyhledavaniKnih.cs`.
+- Tento přístup zajišťuje přehlednost, modularitu a snadné testování.
+
+> [!IMPORTANT]
+> Všechny proměnné se pojmenovávají v angličtině ve stylu PascalCase, to stejné platí pro názvy souborů.
+
+### `Database.cs`
+
+- Obsahuje **definici tabulek** a **datových struktur**, které reprezentují databázi (např. `Knihy`, `Ctenari`, `Vypujcky`).
+- Není vhodné měnit strukturu bez předchozí domluvy s ostatními členy týmu, protože soubor je sdílený v rámci celého projektu.
+
+![Databaze](docs/db-erd.svg)
+
+### `Program.cs`
+
+- Slouží jako **hlavní vstupní bod** aplikace.
+- Zde se spouští program, načítají data a volají funkce z adresáře `src`.
+- Tento soubor zajišťuje propojení všech částí projektu.
+
+---
+
+## Postup při přidávání vaší práce
+
+### Klonování repozitáře
+
+Stáhněte si projekt lokálně pomocí GITu:
+
+```bash
+git clone https://gitea.homework.zip/shinya/Knihovna.git
+```
+
+Tímto příkazem vytvoříte lokální kopii projektu na vašem počítači.
+
+## Úpravy a implementace
+
+Vytvořte nebo upravte soubory v adresáři ./src/.
+
+Dodržujte strukturu projektu a konvence psaní kódu.
+
+Průběžně testujte své změny (např. pomocí dotnet run).
+
+Pokud nemate dotnet tak docker compose up -d
+a docker exec -it knihovna bash
+Tam mate prostredi s nainstalovanym dotnetem a vsemi dependencies
+
+## Commit a push
+
+Jakmile máte změny hotové, proveďte následující příkazy:
+
+Dodržujte conventional commits:
+https://www.conventionalcommits.org/en/v1.0.0/
+
+Cheatsheet:
+https://ashababnoor.github.io/cheatsheets/cheatsheets/conventional-commits
+
+```bash
+git add .
+git commit -m "feat: funkce vyhledávání knih"
+git push
+```
+
+Tímto nahrajete změny zpět na server.
+
+Pozor: Před odesláním změn vždy nejprve stáhněte aktuální verzi projektu:
+
+```bash
+git pull
+```
+
+- a vyřešte případné konflikty, pokud se vyskytnou.
+
+## Zadání projektů
+
+V adresáři ./docs se nachází zadání pro jednotlivé týmy.
+Každý tým má svůj vlastní soubor (např. TymA.md, TymB.md), který obsahuje:
+
+- konkrétní popis úkolu,
+- technické požadavky,
+- a případně hodnoticí kritéria.
+
+## Info
+
 - Přidat, upravit, vypsat, vymazat knihy
 
 - Filtrace knih podle autora atd...
@@ -20,7 +131,7 @@
 
 1. Struktura databáze
 2. Informace z databáze zpracování
-3. 
+3.
 
 ## Funkce
 
@@ -28,7 +139,7 @@
     - GetBooksByAuthor() param. filter
     - GetBooksByName() param. filter
     - GetStolenBooks() param. filter
-    - GetAvailableBooks() param. filter 
+    - GetAvailableBooks() param. filter
 - GetBorrowedBooks() param. userID
 - GetBookInfo() param. knihaID
 - AddBook() param. KnihaInfo

docker-compose.yaml

@@ -0,0 +1,9 @@
+services:
+  knihovna:
+    build: .
+    container_name: knihovna
+    volumes:
+      - .:/app
+    tty: true
+    stdin_open: true
+

docs/test.md

@@ -0,0 +1,107 @@
+Testy:
+Jde pridat knihu
+Jde pridat autora
+Jde pridat publishera
+Jde zmenit pocet vytisku vlastnenych knihovnou
+Jde Vypsat vsechny knihy
+Jde provezt vypujcku
+Jde pridat ctenare
+Jde vratit vypujcku knihy
+Jde vyhledat knihu dle autora, jmena, nevypujcenych knih, a ztracenych knih
+Odstranit knhu
+Upravit autora
+
+Co maji handlovat:
+Prazdne inputy od uzivatele
+Consecutive r/w
+Type checking
+Fuzzing inputu
+
+-----------------------------------------
+
+Scénáře (přidání knihy) + očekávané výstupy
+
+- Předpoklady testů:
+  - Existuje `AuthorID` a `PublisherID` v DB (jinak přidání knihy selže a funkce vrátí null).
+  - Implementace `Team2.AddBook` vkládá přes `INSERT OR IGNORE` a následně dělá `SELECT ... LIMIT 1` podle kombinace `(Name, AuthorID, PublisherID, YearOfRelease)`.
+  - Poznámka ke schématu: pokud tabulka `Books` NEOBSAHUJE sloupec `Available`, vkládání selže SQL chybou a funkce vrátí null. Pokud `Available` existuje (v předem připravené DB), testy s `Available` dávají smysl.
+
+- Základní flow – úspěch:
+  - Vstup: validní `name`, existující `authorId`, existující `publisherId`, rozumný `year`, `total >= 0`, `available >= 0`.
+  - Očekávaný výstup: `BookDto` s nenulovým `Id`, hodnotami dle vstupu; návrat nenull.
+
+- Neexistující autor:
+  - Vstup: `authorId` neexistuje v `Authors`.
+  - Očekávaný výstup: nenastane insert, funkce vrátí `null`.
+
+- Neexistující publisher:
+  - Vstup: `publisherId` neexistuje v `Publisher`.
+  - Očekávaný výstup: nenastane insert, funkce vrátí `null`.
+
+- Duplicita knihy (stejný `name` + `authorId` + `publisherId` + `year`):
+  - Pokud v DB existuje unikátní omezení na tuto kombinaci: `INSERT OR IGNORE` neprovede insert a `SELECT ... LIMIT 1` vrátí existující řádek ⇒ `BookDto` (nenull), nezdvojené data.
+  - Pokud v DB NEexistuje žádné unikátní omezení (výchozí schema v `Database.cs` ho nemá): dojde ke vložení DUPLIKÁTNÍHO řádku, `SELECT ... LIMIT 1` vrátí libovolný první shodný záznam ⇒ `BookDto` (nenull), ale data jsou duplicitní v tabulce.
+
+- `name` prázdný řetězec:
+  - `Books.Name` je `NOT NULL`, ale prázdný řetězec NENÍ `NULL` ⇒ vložení projde.
+  - Očekávaný výstup: `BookDto` (nenull).
+
+- `name` = null:
+  - Při předání `null` jako parametru může dojít k chybě binderu parametrů nebo k pokusu vložit `NULL` do `NOT NULL` sloupce.
+  - Očekávaný výstup: SQL nebo parametrická výjimka uvnitř metody ⇒ metoda chytá výjimku a vrátí `null`.
+
+- `year` záporný nebo 0:
+  - Není validováno na aplikační úrovni ani ve schématu.
+  - Očekávaný výstup: vložení projde ⇒ `BookDto` (nenull).
+
+- `total` záporné číslo:
+  - Není validováno; ve schématu žádné omezení.
+  - Očekávaný výstup: vložení projde ⇒ `BookDto` (nenull). Pozn.: následné reporty mohou dávat nelogické výsledky.
+
+- `available` > `total`:
+  - Není validováno; pokud sloupec `Available` v DB existuje, vloží se bez kontroly.
+  - Očekávaný výstup: `BookDto` (nenull).
+
+- `available` záporné:
+  - Není validováno; pokud sloupec existuje, vloží se.
+  - Očekávaný výstup: `BookDto` (nenull).
+
+- Extrémně dlouhé `name`:
+  - Bez omezení délky; SQLite uloží. Může mít dopad na výkon a čitelnost.
+  - Očekávaný výstup: `BookDto` (nenull).
+
+- Speciální znaky / SQL injection v `name`:
+  - Parametrizované dotazy ⇒ bezpečné vůči SQLi.
+  - Očekávaný výstup: `BookDto` (nenull).
+
+- Současné (konkurenční) vkládání stejné knihy:
+  - Bez unikátního indexu hrozí race condition ⇒ vícenásobné duplicity.
+  - Očekávaný výstup: více identických řádků v `Books`.
+
+- Nesoulad schématu: chybějící `Available` ve `Books`:
+  - `INSERT` obsahuje `Available` sloupec; pokud DB nemá `Available`, dojde k SQL chybě.
+  - Očekávaný výstup: metoda vrátí `null`.
+
+-----------------------------------------
+
+Scénáře (autor) – “stejný autor včetně DOB”
+
+- Vytvoření autora se stejným `Name` + `Surname` + `DateOfBirth` opakovaně:
+  - Pokud existuje unikátní omezení nad (Name, Surname, DateOfBirth): `INSERT OR IGNORE` neprovede insert ⇒ vrácen bude existující autor (nenull).
+  - Pokud unikát neexistuje (výchozí schema v `Database.cs` jej nemá): vloží se DUPLIKÁT; následný `SELECT ... LIMIT 1` vrátí některého z nich ⇒ `AuthorDto` (nenull), ale v DB jsou duplicity.
+
+- Přidání knihy k “stejnému autorovi”:
+  - Logika knihy pracuje výhradně s `authorId`. Pokud existují 2 různé řádky autora se stejnými údaji (Name/Surname/DOB), ale rozdílným `ID`, přidání knihy proběhne ke kterékoliv instanci podle zvoleného `authorId`.
+  - Očekávaný výstup: `BookDto` (nenull), navázáno na konkrétní `AuthorID`, nikoli na shodu jména/DOB.
+
+-----------------------------------------
+
+Edge cases (souhrn)
+
+- Chybějící cizí klíče (`AuthorID`, `PublisherID`) ⇒ návrat `null`.
+- Duplicity bez unikátních indexů ⇒ v DB vznikají vícenásobné identické záznamy.
+- Schéma vs. kód: `Available` ve `Books` – pokud chybí, přidání knihy vždy selže ⇒ `null`.
+- `Name` prázdný vs `NULL`: prázdný projde, `NULL` vyvolá chybu kvůli `NOT NULL`.
+- Hodnoty mimo rozsah (záporné `year`/`total`/`available`) nejsou validovány.
+- Neprobíhá automatické snižování zásob po výpůjčce (`Borrows` neupravují `Books.Total/Available`).
+- Potenciálně nekonzistentní pluralita tabulek v jiných částech (např. `Publishers` vs `Publisher`) – neovlivňuje `Team2.AddBook`, ale je rizikem v integračních testech.

docs/tym1.md

@@ -0,0 +1,9 @@
+# Tým 1
+
+- Obsazení: Vítek (zen), Matyáš (Masro), Jakub (Kub1no23)
+- Termín odevzdání: 8.11.2025 23:59
+
+## Implementace
+
+- `AddAuthor(String Name, String LastName, DateTime BornDate)`
+- `AddPublisher(String Name, String State)`

docs/tym2.md

@@ -0,0 +1,10 @@
+# Tým 2
+
+- Obsazení: Aleš (geekon), Adam (adam)
+- Termín odevzdání: 8.11.2025 23:59
+
+## Implementace
+
+- `AddBook(String Name, DateTime Year, int Author, int Publisher, int Copies)`
+- `AddUser(String Name, String LastName)`
+- `AddBorrowedBookRecord(int Book, int User, DateTime BorrowedDate, int Days=30)`

docs/tym3.md

@@ -0,0 +1,11 @@
+# Tým 3
+
+- Obsazení: Fanda (divinity), Oliver (oliver), Sam (five)
+- Termín odevzdání: 8.11.2025 23:59
+
+## Implementace
+
+- `EditBook(book Book)`
+- `EditAuthor(author Author)`
+- `EditPublisher(publisher Publisher)`
+- `EditUser(user User)`

docs/tym4.md

@@ -0,0 +1,14 @@
+# Tým 4
+
+- Obsazení: Filip (shinya), Albert (haterdotdev), Skajp
+- Termín odevzdání: 8.11.2025 23:59
+
+## Implementace
+
+- `GetBooksByName`
+- `GetBooksByAuthor`
+- `GetBooksByAvailableBooks`
+- `GetStolenBooks`
+- `GetStolenBooksByUser`
+- `GetBooksBy`
+- `GetBorrowLogBy`

src/Dto/Author.cs

@@ -0,0 +1,14 @@
+namespace Database.Dto;
+
+
+public class CreateAuthorDto
+{
+  public string Name;
+  public string Surname;
+  public DateTime DateOfBirth;
+}
+
+public class AuthorDto : CreateAuthorDto
+{
+  public int Id;
+}

src/Dto/Book.cs

@@ -0,0 +1,17 @@
+namespace Database.Dto;
+
+public class CreateBookDto
+{
+
+  public string Name;
+  public int YearOfRelease;
+  public int Total;
+  public AuthorDto Author;
+  public Publisher Publisher;
+}
+
+public class BookDto : CreateBookDto
+{
+  public int Id;
+
+}

src/Dto/Borrow.cs

@@ -0,0 +1,16 @@
+namespace Database.Dto;
+
+
+public class BorrowCreateDto
+{
+  public DateTime DateOfBorrow;
+  public DateTime DateOfReturn;
+  public DateTime ReturnDue;
+  public UserDto User;
+  public BookDto Book;
+}
+
+public class Borrow : BorrowCreateDto
+{
+  public int Id;
+}

src/Dto/Publisher.cs

@@ -0,0 +1,14 @@
+namespace Database.Dto;
+
+
+public class CreatePublisherDto
+{
+  public string Name;
+  public string State;
+
+}
+
+public class Publisher : CreatePublisherDto
+{
+  public int Id;
+}

src/Dto/User.cs

@@ -0,0 +1,13 @@
+namespace Database.Dto;
+
+
+public class UserCreateDto
+{
+  public string Name;
+  public string Surname;
+}
+
+public class UserDto : UserCreateDto
+{
+  public int Id;
+}

src/Tests.cs

@@ -0,0 +1,572 @@
+using System;
+using System.Collections.Generic;
+using Microsoft.Data.Sqlite;
+using Database.Dto;
+using Team2;
+using Team3;
+using Team4;
+
+namespace Tests
+{
+	public static class TestRunner
+	{
+		private static int _passed;
+		private static int _failed;
+
+		public static void RunAll()
+		{
+			_passed = 0;
+			_failed = 0;
+
+			Run(Test_AddBook_Success);
+			Run(Test_AddBook_MissingAuthor_Fails);
+			Run(Test_AddBook_MissingPublisher_Fails);
+			Run(Test_AddBook_Duplicate_AllowsWithoutUniqueIndex);
+			Run(Test_AddBook_EmptyName_Succeeds);
+			Run(Test_AddBook_NullName_Fails);
+			Run(Test_AddBook_NegativeValues_Succeeds);
+			Run(Test_AddBook_AvailableGreaterThanTotal_Succeeds);
+			Run(Test_Author_DuplicateSameDOB_AllowedWithoutUniqueIndex);
+			Run(Test_AddAuthor_EmptyName_Succeeds_And_NullName_Fails);
+			Run(Test_AddPublisher_Success_Duplicates_And_NullName_Fails);
+			Run(Test_AddUser_Success_And_DuplicatesAllowed);
+			Run(Test_Borrow_Success);
+			Run(Test_Borrow_DueDate_Default_30Days);
+			Run(Test_Borrow_MissingUser_Fails);
+			Run(Test_Borrow_MissingBook_Fails);
+			Run(Test_GetBooksByName_MultipleMatches);
+			Run(Test_GetBooksByAuthor_ReturnsBooks);
+			Run(Test_GetBooksByAvailableBooks_Filter);
+			Run(Test_StolenBooks_Scenarios);
+			Run(Test_StolenBooks_None_ReturnsEmpty);
+			Run(Test_GetAuthorById_Success_And_NotFound);
+			Run(Test_Team4_Methods_Throw_On_ClosedConnection);
+			Run(Test_Team4_All_Methods_Throw_On_ClosedConnection);
+			Run(Test_Team4_NotImplemented_Methods_Throw);
+			Run(Test_EditAuthor_Success_And_NotFound);
+			Run(Test_EditPublisher_Success_And_NotFound);
+			Run(Test_EditUser_Success_And_NotFound);
+			Run(Test_EditBook_Success_And_Failures);
+
+			Console.WriteLine();
+			Console.WriteLine($"Tests finished. Passed: {_passed}, Failed: {_failed}");
+		}
+
+		private static void Run(Action test)
+		{
+			string name = test.Method.Name;
+			try
+			{
+				test();
+				_passed++;
+				Console.WriteLine($"[PASS] {name}");
+			}
+			catch (Exception ex)
+			{
+				_failed++;
+				Console.WriteLine($"[FAIL] {name}: {ex.Message}");
+			}
+		}
+
+		private static SqliteConnection NewMemoryConnection()
+		{
+			SqliteConnection conn = new SqliteConnection("Data Source=:memory:");
+			conn.Open();
+			Database.Database.CreateDatabaseQuery(conn);
+			return conn;
+		}
+
+		private static int CountBooks(SqliteConnection conn, string name, int authorId, int publisherId, int year)
+		{
+			using (SqliteCommand cmd = conn.CreateCommand())
+			{
+				cmd.CommandText = @"SELECT COUNT(*) FROM Books 
+									WHERE Name = @name AND AuthorID = @aid AND PublisherID = @pid AND YearOfRelease = @year;";
+				cmd.Parameters.AddWithValue("@name", name);
+				cmd.Parameters.AddWithValue("@aid", authorId);
+				cmd.Parameters.AddWithValue("@pid", publisherId);
+				cmd.Parameters.AddWithValue("@year", year);
+				return Convert.ToInt32(cmd.ExecuteScalar());
+			}
+		}
+
+		private static int CountAuthors(SqliteConnection conn, string name, string surname, DateTime dob)
+		{
+			using (SqliteCommand cmd = conn.CreateCommand())
+			{
+				cmd.CommandText = @"SELECT COUNT(*) FROM Authors 
+									WHERE Name = @name AND Surname = @surname AND DateOfBirth = @dob;";
+				cmd.Parameters.AddWithValue("@name", name);
+				cmd.Parameters.AddWithValue("@surname", surname);
+				cmd.Parameters.AddWithValue("@dob", dob.ToString("yyyy-MM-dd"));
+				return Convert.ToInt32(cmd.ExecuteScalar());
+			}
+		}
+
+		private static int CountUsers(SqliteConnection conn, string name, string surname)
+		{
+			using (SqliteCommand cmd = conn.CreateCommand())
+			{
+				cmd.CommandText = @"SELECT COUNT(*) FROM Users WHERE Name = @name AND Surname = @surname;";
+				cmd.Parameters.AddWithValue("@name", name);
+				cmd.Parameters.AddWithValue("@surname", surname);
+				return Convert.ToInt32(cmd.ExecuteScalar());
+			}
+		}
+
+		private static int CountBorrowsForUserBook(SqliteConnection conn, int userId, int bookId)
+		{
+			using (SqliteCommand cmd = conn.CreateCommand())
+			{
+				cmd.CommandText = @"SELECT COUNT(*) FROM Borrows WHERE UserID = @uid AND BookID = @bid;";
+				cmd.Parameters.AddWithValue("@uid", userId);
+				cmd.Parameters.AddWithValue("@bid", bookId);
+				return Convert.ToInt32(cmd.ExecuteScalar());
+			}
+		}
+
+		private static Publisher EnsurePublisher(SqliteConnection conn, string name = "Penguin", string state = "US")
+		{
+			Publisher p = Team2.Team2.AddPublisher(conn, name, state);
+			if (p == null || p.Id <= 0) throw new Exception("Publisher creation failed");
+			return p;
+		}
+
+		private static AuthorDto EnsureAuthor(SqliteConnection conn, string name = "John", string surname = "Doe", int year = 1990, int month = 1, int day = 1)
+		{
+			AuthorDto a = Team2.Team2.AddAuthor(conn, name, surname, new DateTime(year, month, day));
+			if (a == null || a.Id <= 0) throw new Exception("Author creation failed");
+			return a;
+		}
+
+		private static UserDto EnsureUser(SqliteConnection conn, string name = "Alice", string surname = "Smith")
+		{
+			UserDto u = Team2.Team2.AddUser(conn, name, surname);
+			if (u == null || u.Id <= 0) throw new Exception("User creation failed");
+			return u;
+		}
+
+		private static BookDto EnsureBook(SqliteConnection conn, string title = "Sample Book", int year = 2001, int total = 3, int available = 3)
+		{
+			AuthorDto author = EnsureAuthor(conn);
+			Publisher publisher = EnsurePublisher(conn);
+			BookDto book = Team2.Team2.AddBook(conn, title, author.Id, publisher.Id, year, total, available);
+			if (book == null || book.Id <= 0) throw new Exception("Book creation failed");
+			return book;
+		}
+
+		// Tests
+
+		// Team2 - Books
+		private static void Test_AddBook_Success()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				AuthorDto author = EnsureAuthor(conn);
+				Publisher publisher = EnsurePublisher(conn);
+				BookDto book = Team2.Team2.AddBook(conn, "Clean Code", author.Id, publisher.Id, 2008, 10, 10);
+				if (book == null || book.Id <= 0) throw new Exception("Expected book to be created");
+				if (book.Name != "Clean Code") throw new Exception("Name mismatch");
+				if (book.YearOfRelease != 2008) throw new Exception("Year mismatch");
+				if (book.Total != 10) throw new Exception("Total mismatch");
+				int cnt = CountBooks(conn, "Clean Code", author.Id, publisher.Id, 2008);
+				if (cnt != 1) throw new Exception("Expected exactly one row for the book");
+			}
+		}
+
+		private static void Test_AddBook_MissingAuthor_Fails()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				Publisher publisher = EnsurePublisher(conn);
+				BookDto book = Team2.Team2.AddBook(conn, "No Author Book", 99999, publisher.Id, 2020, 1, 1);
+				if (book != null) throw new Exception("Expected null when author does not exist");
+			}
+		}
+
+		private static void Test_AddBook_MissingPublisher_Fails()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				AuthorDto author = EnsureAuthor(conn);
+				BookDto book = Team2.Team2.AddBook(conn, "No Publisher Book", author.Id, 99999, 2020, 1, 1);
+				if (book != null) throw new Exception("Expected null when publisher does not exist");
+			}
+		}
+
+		private static void Test_AddBook_Duplicate_AllowsWithoutUniqueIndex()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				AuthorDto author = EnsureAuthor(conn);
+				Publisher publisher = EnsurePublisher(conn);
+				BookDto b1 = Team2.Team2.AddBook(conn, "Duplicate", author.Id, publisher.Id, 2021, 2, 2);
+				if (b1 == null) throw new Exception("First insert failed");
+				BookDto b2 = Team2.Team2.AddBook(conn, "Duplicate", author.Id, publisher.Id, 2021, 2, 2);
+				if (b2 == null) throw new Exception("Second insert unexpectedly failed");
+				int cnt = CountBooks(conn, "Duplicate", author.Id, publisher.Id, 2021);
+				if (cnt < 2) throw new Exception("Expected duplicates without a unique index");
+			}
+		}
+
+		private static void Test_AddBook_EmptyName_Succeeds()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				AuthorDto author = EnsureAuthor(conn);
+				Publisher publisher = EnsurePublisher(conn);
+				BookDto book = Team2.Team2.AddBook(conn, "", author.Id, publisher.Id, 2000, 1, 1);
+				if (book == null) throw new Exception("Empty string name should be allowed (NOT NULL != empty)");
+			}
+		}
+
+		private static void Test_AddBook_NullName_Fails()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				AuthorDto author = EnsureAuthor(conn);
+				Publisher publisher = EnsurePublisher(conn);
+				#pragma warning disable CS8625, CS8604, CS8600
+				BookDto book = Team2.Team2.AddBook(conn, (string)(object)null, author.Id, publisher.Id, 2000, 1, 1);
+				#pragma warning restore CS8625, CS8604, CS8600
+				if (book != null) throw new Exception("Expected null when inserting NULL into NOT NULL column");
+			}
+		}
+
+		private static void Test_AddBook_NegativeValues_Succeeds()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				AuthorDto author = EnsureAuthor(conn);
+				Publisher publisher = EnsurePublisher(conn);
+				BookDto book = Team2.Team2.AddBook(conn, "NegativeVals", author.Id, publisher.Id, -1, -5, -2);
+				if (book == null) throw new Exception("Negative values should not be validated at DB level here");
+				if (book.YearOfRelease != -1) throw new Exception("Year not stored as provided");
+				if (book.Total != -5) throw new Exception("Total not stored as provided");
+			}
+		}
+
+		private static void Test_AddBook_AvailableGreaterThanTotal_Succeeds()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				AuthorDto author = EnsureAuthor(conn);
+				Publisher publisher = EnsurePublisher(conn);
+				BookDto book = Team2.Team2.AddBook(conn, "AvailGtTotal", author.Id, publisher.Id, 2010, 1, 5);
+				if (book == null) throw new Exception("Available > Total currently not validated; insert should succeed");
+			}
+		}
+
+		private static void Test_Author_DuplicateSameDOB_AllowedWithoutUniqueIndex()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				string name = "Jane";
+				string surname = "Doe";
+				DateTime dob = new DateTime(1995, 5, 5);
+				AuthorDto a1 = Team2.Team2.AddAuthor(conn, name, surname, dob);
+				if (a1 == null) throw new Exception("First author insert failed");
+				AuthorDto a2 = Team2.Team2.AddAuthor(conn, name, surname, dob);
+				if (a2 == null) throw new Exception("Second author insert unexpectedly failed");
+				int cnt = CountAuthors(conn, name, surname, dob);
+				if (cnt < 2) throw new Exception("Expected duplicate authors without a unique index");
+			}
+		}
+
+		// Team2 - Users
+		private static void Test_AddAuthor_EmptyName_Succeeds_And_NullName_Fails()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				// Empty name should be allowed (NOT NULL != empty)
+				AuthorDto a1 = Team2.Team2.AddAuthor(conn, "", "S", new DateTime(1990, 1, 1));
+				if (a1 == null || a1.Id <= 0) throw new Exception("Empty author name should be allowed");
+				// Null name should fail and return null
+				#pragma warning disable CS8625, CS8604, CS8600
+				AuthorDto a2 = Team2.Team2.AddAuthor(conn, (string)(object)null, "S", new DateTime(1990, 1, 1));
+				#pragma warning restore CS8625, CS8604, CS8600
+				if (a2 != null) throw new Exception("Expected null when inserting NULL author name");
+			}
+		}
+
+		private static void Test_AddPublisher_Success_Duplicates_And_NullName_Fails()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				Publisher p1 = Team2.Team2.AddPublisher(conn, "PubX", "CZ");
+				if (p1 == null || p1.Id <= 0) throw new Exception("Publisher insert failed");
+				Publisher p2 = Team2.Team2.AddPublisher(conn, "PubX", "CZ");
+				if (p2 == null || p2.Id <= 0) throw new Exception("Duplicate publisher insert unexpectedly failed");
+				#pragma warning disable CS8625, CS8604, CS8600
+				Publisher p3 = Team2.Team2.AddPublisher(conn, (string)(object)null, "CZ");
+				#pragma warning restore CS8625, CS8604, CS8600
+				if (p3 != null) throw new Exception("Expected null when inserting NULL publisher name");
+			}
+		}
+
+		private static void Test_AddUser_Success_And_DuplicatesAllowed()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				UserDto u1 = Team2.Team2.AddUser(conn, "Bob", "Brown");
+				if (u1 == null || u1.Id <= 0) throw new Exception("User insert failed");
+				UserDto u2 = Team2.Team2.AddUser(conn, "Bob", "Brown");
+				if (u2 == null || u2.Id <= 0) throw new Exception("Duplicate user insert unexpectedly failed");
+				int cnt = CountUsers(conn, "Bob", "Brown");
+				if (cnt < 2) throw new Exception("Expected duplicate users without a unique index");
+			}
+		}
+
+		// Team2 - Borrow
+		private static void Test_Borrow_Success()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				UserDto user = EnsureUser(conn);
+				BookDto book = EnsureBook(conn, "Borrowed Book", 2015, 5, 5);
+				DateTime borrowed = DateTime.UtcNow.Date;
+				Borrow borrow = Team2.Team2.AddBorrowedBookRecord(conn, book.Id, user.Id, borrowed);
+				if (borrow == null || borrow.Id <= 0) throw new Exception("Borrow creation failed");
+				if (borrow.User == null || borrow.User.Id != user.Id) throw new Exception("Borrow.User mismatch");
+				if (borrow.Book == null || borrow.Book.Id != book.Id) throw new Exception("Borrow.Book mismatch");
+				int cnt = CountBorrowsForUserBook(conn, user.Id, book.Id);
+				if (cnt != 1) throw new Exception("Expected exactly one borrow record");
+			}
+		}
+
+		private static void Test_Borrow_DueDate_Default_30Days()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				UserDto user = EnsureUser(conn);
+				BookDto book = EnsureBook(conn, "Borrowed Book 2", 2016, 2, 2);
+				DateTime borrowed = new DateTime(2020, 1, 1);
+				Borrow borrow = Team2.Team2.AddBorrowedBookRecord(conn, book.Id, user.Id, borrowed);
+				if (borrow == null) throw new Exception("Borrow creation failed");
+				DateTime expectedDue = borrowed.AddDays(30);
+				if (borrow.ReturnDue.Date != expectedDue.Date) throw new Exception($"ReturnDue mismatch: got {borrow.ReturnDue.Date:yyyy-MM-dd}, expected {expectedDue:yyyy-MM-dd}");
+			}
+		}
+
+		private static void Test_Borrow_MissingUser_Fails()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				BookDto book = EnsureBook(conn);
+				Borrow borrow = Team2.Team2.AddBorrowedBookRecord(conn, book.Id, 999999, DateTime.UtcNow.Date);
+				if (borrow != null) throw new Exception("Expected null when borrowing with missing user");
+			}
+		}
+
+		private static void Test_Borrow_MissingBook_Fails()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				UserDto user = EnsureUser(conn);
+				Borrow borrow = Team2.Team2.AddBorrowedBookRecord(conn, 999999, user.Id, DateTime.UtcNow.Date);
+				if (borrow != null) throw new Exception("Expected null when borrowing with missing book");
+			}
+		}
+
+		// Team4 - Queries and exceptions
+		private static void Test_GetBooksByName_MultipleMatches()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				BookDto b1 = EnsureBook(conn, "SameName", 2000, 1, 1);
+				BookDto b2 = EnsureBook(conn, "SameName", 2001, 2, 2);
+				List<BookDto> books = Team4.Team4.GetBooksByName(conn, "SameName");
+				if (books == null || books.Count < 2) throw new Exception("Expected at least two books with same name");
+			}
+		}
+
+		private static void Test_GetBooksByAuthor_ReturnsBooks()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				AuthorDto author = EnsureAuthor(conn, "Auth", "One", 1980, 1, 1);
+				Publisher publisher = EnsurePublisher(conn, "P1", "US");
+				BookDto b1 = Team2.Team2.AddBook(conn, "ByAuthor1", author.Id, publisher.Id, 2010, 1, 1);
+				BookDto b2 = Team2.Team2.AddBook(conn, "ByAuthor2", author.Id, publisher.Id, 2011, 1, 1);
+				List<BookDto> books = Team4.Team4.GetBooksByAuthor(conn, author);
+				if (books == null || books.Count < 2) throw new Exception("Expected two books by author");
+			}
+		}
+
+		private static void Test_GetBooksByAvailableBooks_Filter()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				BookDto b1 = EnsureBook(conn, "Stock1", 2000, 0, 0);
+				BookDto b2 = EnsureBook(conn, "Stock2", 2001, 2, 2);
+				List<BookDto> books = Team4.Team4.GetBooksByAvailableBooks(conn, 1);
+				if (books == null) throw new Exception("Expected list, got null");
+				bool hasStock2 = false;
+				for (int i = 0; i < books.Count; i++)
+				{
+					if (books[i].Name == "Stock2") { hasStock2 = true; break; }
+				}
+				if (!hasStock2) throw new Exception("Expected Stock2 in results for minStock=1");
+			}
+		}
+
+		private static void Test_StolenBooks_Scenarios()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				UserDto user = EnsureUser(conn);
+				BookDto book = EnsureBook(conn, "Overdue", 2005, 1, 1);
+				// Borrow far in the past so ReturnDue < now
+				DateTime borrowedPast = DateTime.UtcNow.Date.AddDays(-60);
+				Borrow br = Team2.Team2.AddBorrowedBookRecord(conn, book.Id, user.Id, borrowedPast);
+				if (br == null) throw new Exception("Failed to create overdue borrow");
+				List<BookDto> stolenAll = Team4.Team4.GetStolenBooks(conn);
+				if (stolenAll == null || stolenAll.Count == 0) throw new Exception("Expected stolen books to include the overdue borrow");
+				List<BookDto> stolenByUser = Team4.Team4.GetStolenBooksByUser(conn, user);
+				if (stolenByUser == null || stolenByUser.Count == 0) throw new Exception("Expected stolen books by user");
+			}
+		}
+
+		private static void Test_StolenBooks_None_ReturnsEmpty()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				List<BookDto> stolenAll = Team4.Team4.GetStolenBooks(conn);
+				if (stolenAll == null) throw new Exception("Expected empty list, got null");
+				if (stolenAll.Count != 0) throw new Exception("Expected no stolen books initially");
+			}
+		}
+
+		private static void Test_GetAuthorById_Success_And_NotFound()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				AuthorDto a = EnsureAuthor(conn, "Lookup", "Author", 1970, 1, 1);
+				AuthorDto ok = Team4.Team4.GetAuthorById(conn, a.Id);
+				if (ok == null || ok.Id != a.Id) throw new Exception("Expected author lookup success");
+				AuthorDto missing = Team4.Team4.GetAuthorById(conn, 999999);
+				if (missing != null) throw new Exception("Expected null for missing author");
+			}
+		}
+
+		private static void Test_Team4_Methods_Throw_On_ClosedConnection()
+		{
+			SqliteConnection conn = new SqliteConnection("Data Source=:memory:");
+			conn.Open();
+			Database.Database.CreateDatabaseQuery(conn);
+			conn.Close();
+			bool threw = false;
+			try
+			{
+				List<BookDto> _ = Team4.Team4.GetBooksByName(conn, "Anything");
+			}
+			catch (Exception)
+			{
+				threw = true;
+			}
+			if (!threw) throw new Exception("Expected Team4.GetBooksByName to throw on closed connection");
+		}
+
+		private static void Test_Team4_All_Methods_Throw_On_ClosedConnection()
+		{
+			SqliteConnection conn = new SqliteConnection("Data Source=:memory:");
+			conn.Open();
+			Database.Database.CreateDatabaseQuery(conn);
+			conn.Close();
+			string fail(string method) { return $"Expected {method} to throw on closed connection"; }
+			try { Team4.Team4.GetBooksByAuthor(conn, new AuthorDto { Id = 1, Name = "", Surname = "", DateOfBirth = new DateTime(2000, 1, 1) }); throw new Exception(fail("GetBooksByAuthor")); } catch (Exception) { }
+			try { Team4.Team4.GetBooksByAvailableBooks(conn, 1); throw new Exception(fail("GetBooksByAvailableBooks")); } catch (Exception) { }
+			try { Team4.Team4.GetStolenBooks(conn); throw new Exception(fail("GetStolenBooks")); } catch (Exception) { }
+			try { Team4.Team4.GetStolenBooksByUser(conn, new UserDto { Id = 1, Name = "", Surname = "" }); throw new Exception(fail("GetStolenBooksByUser")); } catch (Exception) { }
+			try { Team4.Team4.GetAuthorById(conn, 1); throw new Exception(fail("GetAuthorById")); } catch (Exception) { }
+		}
+
+		private static void Test_Team4_NotImplemented_Methods_Throw()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				bool threw1 = false;
+				try { Team4.Team4.GetBooksBy(conn); } catch (NotImplementedException) { threw1 = true; }
+				if (!threw1) throw new Exception("Expected NotImplementedException from GetBooksBy");
+				bool threw2 = false;
+				try { Team4.Team4.GetBorrowLogBy(conn); } catch (NotImplementedException) { threw2 = true; }
+				if (!threw2) throw new Exception("Expected NotImplementedException from GetBorrowLogBy");
+			}
+		}
+
+		// Team3 - Edit operations
+		private static void Test_EditAuthor_Success_And_NotFound()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				AuthorDto a = EnsureAuthor(conn, "Old", "Name", 1985, 2, 2);
+				a.Name = "New";
+				a.Surname = "Surname";
+				AuthorDto? updated = EditRecords.EditAuthor(conn, a);
+				if (updated == null || updated.Name != "New" || updated.Surname != "Surname") throw new Exception("EditAuthor failed to update");
+				AuthorDto? notFound = EditRecords.EditAuthor(conn, new AuthorDto { Id = 999999, Name = "X", Surname = "Y", DateOfBirth = new DateTime(1990, 1, 1) });
+				if (notFound != null) throw new Exception("Expected null for non-existing author");
+			}
+		}
+
+		private static void Test_EditPublisher_Success_And_NotFound()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				Publisher p = EnsurePublisher(conn, "OldPub", "UK");
+				p.Name = "NewPub";
+				p.State = "CZ";
+				Publisher? updated = EditRecords.EditPublisher(conn, p);
+				if (updated == null || updated.Name != "NewPub" || updated.State != "CZ") throw new Exception("EditPublisher failed to update");
+				Publisher? notFound = EditRecords.EditPublisher(conn, new Publisher { Id = 999999, Name = "X", State = "Y" });
+				if (notFound != null) throw new Exception("Expected null for non-existing publisher");
+			}
+		}
+
+		private static void Test_EditUser_Success_And_NotFound()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				UserDto u = EnsureUser(conn, "Carl", "Jr");
+				u.Name = "Carlos";
+				u.Surname = "Senior";
+				UserDto? updated = EditRecords.EditUser(conn, u);
+				if (updated == null || updated.Name != "Carlos" || updated.Surname != "Senior") throw new Exception("EditUser failed to update");
+				UserDto? notFound = EditRecords.EditUser(conn, new UserDto { Id = 999999, Name = "X", Surname = "Y" });
+				if (notFound != null) throw new Exception("Expected null for non-existing user");
+			}
+		}
+
+		private static void Test_EditBook_Success_And_Failures()
+		{
+			using (SqliteConnection conn = NewMemoryConnection())
+			{
+				// Seed original
+				AuthorDto a1 = EnsureAuthor(conn, "A", "One", 1970, 1, 1);
+				Publisher p1 = EnsurePublisher(conn, "Pub1", "US");
+				BookDto b = Team2.Team2.AddBook(conn, "Original", a1.Id, p1.Id, 1999, 1, 1);
+				if (b == null) throw new Exception("Seeding book failed");
+				// Prepare updates
+				AuthorDto a2 = EnsureAuthor(conn, "A", "Two", 1975, 1, 1);
+				Publisher p2 = EnsurePublisher(conn, "Pub2", "DE");
+				b.Name = "Updated";
+				b.Author = a2;
+				b.Publisher = p2;
+				b.YearOfRelease = 2000;
+				b.Total = 5;
+				BookDto? updated = EditRecords.EditBook(conn, b);
+				if (updated == null || updated.Name != "Updated" || updated.Author.Id != a2.Id || updated.Publisher.Id != p2.Id) throw new Exception("EditBook failed to update");
+				// Not found
+				BookDto? notFound = EditRecords.EditBook(conn, new BookDto { Id = 999999, Name = "X", YearOfRelease = 2000, Total = 1, Author = a2, Publisher = p2 });
+				if (notFound != null) throw new Exception("Expected null for non-existing book");
+				// Invalid author
+				BookDto invalidAuthor = new BookDto { Id = b.Id, Name = "X", YearOfRelease = 2001, Total = 1, Author = new AuthorDto { Id = 999999, Name = "Na", Surname = "Na", DateOfBirth = new DateTime(1970, 1, 1) }, Publisher = p2 };
+				if (EditRecords.EditBook(conn, invalidAuthor) != null) throw new Exception("Expected null when editing with non-existing author");
+				// Invalid publisher
+				BookDto invalidPublisher = new BookDto { Id = b.Id, Name = "X", YearOfRelease = 2001, Total = 1, Author = a2, Publisher = new Publisher { Id = 999999, Name = "Na", State = "Na" } };
+				if (EditRecords.EditBook(conn, invalidPublisher) != null) throw new Exception("Expected null when editing with non-existing publisher");
+			}
+		}
+	}
+}
+

src/team1.cs

@@ -0,0 +1,36 @@
+using System;
+using Microsoft.Data.Sqlite;
+
+namespace Team1
+{
+    class Library
+    {
+        private SqliteConnection connection;
+        public Library(SqliteConnection connection)
+        {
+            this.connection = connection;
+        }
+        public static void AddAuthor(string name, string lastName, DateTime dateOfBirth, SqliteConnection connection)
+        {
+            string sql = @"INSERT INTO Authors (Name, Surname, DateOfBirth) VALUES (@name, @lastName, @dateOfBirth)";
+            using (var com = new SqliteCommand(sql, connection))
+            {
+                com.Parameters.AddWithValue("@name", name);
+                com.Parameters.AddWithValue("@lastName", lastName);
+                com.Parameters.AddWithValue("@dateOfBirth", dateOfBirth);
+                com.ExecuteNonQuery();
+            }
+        }
+
+        public static void AddPublisher(string name, string state, SqliteConnection connection)
+        {
+            string sql = @"INSERT INTO Publishers (Name, State) VALUES (@name, @state)";
+            using (var com = new SqliteCommand(sql, connection))
+            {
+                com.Parameters.AddWithValue("@name", name);
+                com.Parameters.AddWithValue("@state", state);
+                com.ExecuteNonQuery();
+            }
+        }
+    }
+}

src/team2.cs

@@ -0,0 +1,265 @@
+using System;
+using Microsoft.Data.Sqlite;
+using Database.Dto;
+
+namespace Team2
+{
+    public static class Team2
+{
+    public static AuthorDto AddAuthor(SqliteConnection connection, string name, string surname, DateTime dateOfBirth)
+    {
+        try
+        {
+            var dob = dateOfBirth.ToString("yyyy-MM-dd");
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = "INSERT OR IGNORE INTO Authors (Name, Surname, DateOfBirth) VALUES (@name, @surname, @dob);";
+                cmd.Parameters.AddWithValue("@name", name);
+                cmd.Parameters.AddWithValue("@surname", surname);
+                cmd.Parameters.AddWithValue("@dob", dob);
+                cmd.ExecuteNonQuery();
+            }
+
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = "SELECT ID, Name, Surname, DateOfBirth FROM Authors WHERE Name = @name AND Surname = @surname AND DateOfBirth = @dob LIMIT 1;";
+                cmd.Parameters.AddWithValue("@name", name);
+                cmd.Parameters.AddWithValue("@surname", surname);
+                cmd.Parameters.AddWithValue("@dob", dob);
+
+                using (var reader = cmd.ExecuteReader())
+                {
+                    if (!reader.Read()) return null;
+                    var a = new AuthorDto
+                    {
+                        Id = reader.IsDBNull(0) ? 0 : reader.GetInt32(0),
+                        Name = reader.IsDBNull(1) ? "" : reader.GetString(1),
+                        Surname = reader.IsDBNull(2) ? "" : reader.GetString(2),
+                        DateOfBirth = reader.IsDBNull(3) ? DateTime.MinValue : reader.GetDateTime(3)
+                    };
+                    return a;
+                }
+            }
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    public static Publisher AddPublisher(SqliteConnection connection, string name, string state)
+    {
+        try
+        {
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = "INSERT OR IGNORE INTO Publisher (Name, State) VALUES (@name, @state);";
+                cmd.Parameters.AddWithValue("@name", name);
+                cmd.Parameters.AddWithValue("@state", state);
+                cmd.ExecuteNonQuery();
+            }
+
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = "SELECT ID, Name, State FROM Publisher WHERE Name = @name AND State = @state LIMIT 1;";
+                cmd.Parameters.AddWithValue("@name", name);
+                cmd.Parameters.AddWithValue("@state", state);
+
+                using (var reader = cmd.ExecuteReader())
+                {
+                    if (!reader.Read()) return null;
+                    return new Publisher
+                    {
+                        Id = reader.IsDBNull(0) ? 0 : reader.GetInt32(0),
+                        Name = reader.IsDBNull(1) ? "" : reader.GetString(1),
+                        State = reader.IsDBNull(2) ? "" : reader.GetString(2)
+                    };
+                }
+            }
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    public static BookDto AddBook(SqliteConnection connection, string name, int authorId, int publisherId, int year, int total, int available)
+    {
+        try
+        {
+            // check author
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = "SELECT 1 FROM Authors WHERE ID = @Aid;";
+                cmd.Parameters.AddWithValue("@Aid", authorId);
+                using (var r = cmd.ExecuteReader())
+                {
+                    if (!r.HasRows) return null;
+                }
+            }
+
+            // check publisher
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = "SELECT 1 FROM Publisher WHERE ID = @Pid;";
+                cmd.Parameters.AddWithValue("@Pid", publisherId);
+                using (var r = cmd.ExecuteReader())
+                {
+                    if (!r.HasRows) return null;
+                }
+            }
+
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = @"INSERT OR IGNORE INTO Books (Name, AuthorID, PublisherID, YearOfRelease, Total, Available) 
+                                    VALUES (@name, @author, @publisher, @year, @total, @available);";
+                cmd.Parameters.AddWithValue("@name", name);
+                cmd.Parameters.AddWithValue("@author", authorId);
+                cmd.Parameters.AddWithValue("@publisher", publisherId);
+                cmd.Parameters.AddWithValue("@year", year);
+                cmd.Parameters.AddWithValue("@total", total);
+                cmd.Parameters.AddWithValue("@available", available);
+                cmd.ExecuteNonQuery();
+            }
+
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = @"SELECT ID, Name, AuthorID, PublisherID, YearOfRelease, Total, Available 
+                                    FROM Books 
+                                    WHERE Name = @name AND AuthorID = @author AND PublisherID = @publisher AND YearOfRelease = @year
+                                    LIMIT 1;";
+                cmd.Parameters.AddWithValue("@name", name);
+                cmd.Parameters.AddWithValue("@author", authorId);
+                cmd.Parameters.AddWithValue("@publisher", publisherId);
+                cmd.Parameters.AddWithValue("@year", year);
+
+                using (var reader = cmd.ExecuteReader())
+                {
+                    if (!reader.Read()) return null;
+                    return new BookDto
+                    {
+                        Id = reader.IsDBNull(0) ? 0 : reader.GetInt32(0),
+                        Name = reader.IsDBNull(1) ? "" : reader.GetString(1),
+                        YearOfRelease = reader.IsDBNull(4) ? 0 : reader.GetInt32(4),
+                        Total = reader.IsDBNull(5) ? 0 : reader.GetInt32(5),
+                        Author = new AuthorDto { Id = reader.IsDBNull(2) ? 0 : reader.GetInt32(2) },
+                        Publisher = new Publisher { Id = reader.IsDBNull(3) ? 0 : reader.GetInt32(3) }
+                    };
+                }
+            }
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    public static UserDto AddUser(SqliteConnection connection, string name, string surname)
+    {
+        try
+        {
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = "INSERT OR IGNORE INTO Users (Name, Surname) VALUES (@name, @surname);";
+                cmd.Parameters.AddWithValue("@name", name);
+                cmd.Parameters.AddWithValue("@surname", surname);
+                cmd.ExecuteNonQuery();
+            }
+
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = "SELECT ID, Name, Surname FROM Users WHERE Name = @name AND Surname = @surname LIMIT 1;";
+                cmd.Parameters.AddWithValue("@name", name);
+                cmd.Parameters.AddWithValue("@surname", surname);
+
+                using (var reader = cmd.ExecuteReader())
+                {
+                    if (!reader.Read()) return null;
+                    return new UserDto
+                    {
+                        Id = reader.IsDBNull(0) ? 0 : reader.GetInt32(0),
+                        Name = reader.IsDBNull(1) ? "" : reader.GetString(1),
+                        Surname = reader.IsDBNull(2) ? "" : reader.GetString(2)
+                    };
+                }
+            }
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    public static Borrow AddBorrowedBookRecord(SqliteConnection connection, int bookId, int userId, DateTime borrowedDate, int days = 30)
+    {
+        try
+        {
+            var borrowed = borrowedDate.ToString("yyyy-MM-dd");
+            var due = borrowedDate.AddDays(days).ToString("yyyy-MM-dd");
+
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = "SELECT 1 FROM Users WHERE ID = @Uid;";
+                cmd.Parameters.AddWithValue("@Uid", userId);
+                using (var r = cmd.ExecuteReader())
+                {
+                    if (!r.HasRows) return null;
+                }
+            }
+
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = "SELECT 1 FROM Books WHERE ID = @Bid;";
+                cmd.Parameters.AddWithValue("@Bid", bookId);
+                using (var r = cmd.ExecuteReader())
+                {
+                    if (!r.HasRows) return null;
+                }
+            }
+
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = @"INSERT OR IGNORE INTO Borrows (DateOfBorrow, ReturnDue, UserID, BookID) 
+                                    VALUES (@borrowed, @due, @user, @book);";
+                cmd.Parameters.AddWithValue("@borrowed", borrowed);
+                cmd.Parameters.AddWithValue("@due", due);
+                cmd.Parameters.AddWithValue("@user", userId);
+                cmd.Parameters.AddWithValue("@book", bookId);
+                cmd.ExecuteNonQuery();
+            }
+
+            using (var cmd = connection.CreateCommand())
+            {
+                cmd.CommandText = @"SELECT ID, DateOfBorrow, ReturnDue, DateOfReturn, UserID, BookID 
+                                    FROM Borrows 
+                                    WHERE DateOfBorrow = @borrowed AND ReturnDue = @due AND UserID = @user AND BookID = @book
+                                    LIMIT 1;";
+                cmd.Parameters.AddWithValue("@borrowed", borrowed);
+                cmd.Parameters.AddWithValue("@due", due);
+                cmd.Parameters.AddWithValue("@user", userId);
+                cmd.Parameters.AddWithValue("@book", bookId);
+
+                using (var reader = cmd.ExecuteReader())
+                {
+                    if (!reader.Read()) return null;
+                    var b = new Borrow
+                    {
+                        Id = reader.IsDBNull(0) ? 0 : reader.GetInt32(0),
+                        DateOfBorrow = reader.IsDBNull(1) ? DateTime.MinValue : reader.GetDateTime(1),
+                        ReturnDue = reader.IsDBNull(2) ? DateTime.MinValue : reader.GetDateTime(2),
+                        DateOfReturn = reader.IsDBNull(3) ? DateTime.MinValue : reader.GetDateTime(3),
+                        User = new UserDto { Id = reader.IsDBNull(4) ? 0 : reader.GetInt32(4) },
+                        Book = new BookDto { Id = reader.IsDBNull(5) ? 0 : reader.GetInt32(5) }
+                    };
+                    return b;
+                }
+            }
+        }
+        catch
+        {
+            return null;
+        }
+    }
+}
+
+}

src/team3.cs

@@ -0,0 +1,286 @@
+using System;
+using Microsoft.Data.Sqlite;
+using Database.Dto;
+
+namespace Team3
+{
+    class EditRecords
+    {
+        public static AuthorDto? EditAuthor(SqliteConnection connection, AuthorDto author)
+        {
+            using (var command = new SqliteCommand())
+            {
+                command.Connection = connection;
+                try
+                {
+                    // Check if author exists
+                    command.CommandText = "SELECT 1 FROM Authors WHERE ID = @id;";
+                    command.Parameters.AddWithValue("@id", author.Id);
+                    using (var reader = command.ExecuteReader())
+                    {
+                        if (!reader.HasRows)
+                        {
+                            Console.WriteLine($"Author with ID {author.Id} does not exist.");
+                            return null;
+                        }
+                    }
+
+                    // Update author
+                    command.CommandText = @"UPDATE Authors 
+                                       SET Name = @name, Surname = @surname, DateOfBirth = @dob 
+                                       WHERE ID = @id;";
+                    command.Parameters.Clear();
+                    command.Parameters.AddWithValue("@name", author.Name);
+                    command.Parameters.AddWithValue("@surname", author.Surname);
+                    command.Parameters.AddWithValue("@dob", author.DateOfBirth.ToString("yyyy-MM-dd"));
+                    command.Parameters.AddWithValue("@id", author.Id);
+                    command.ExecuteNonQuery();
+
+                    // Retrieve updated author
+                    command.CommandText = "SELECT ID, Name, Surname, DateOfBirth FROM Authors WHERE ID = @id;";
+                    command.Parameters.Clear();
+                    command.Parameters.AddWithValue("@id", author.Id);
+                    using (var reader = command.ExecuteReader())
+                    {
+                        if (reader.Read())
+                        {
+                            var updatedAuthor = new AuthorDto
+                            {
+                                Id = reader.GetInt32(0),
+                                Name = reader.GetString(1),
+                                Surname = reader.GetString(2),
+                                DateOfBirth = DateTime.Parse(reader.GetString(3))
+                            };
+                            Console.WriteLine("Author updated successfully.");
+                            return updatedAuthor;
+                        }
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"EditAuthor failed: {ex.Message}");
+                }
+            }
+            return null;
+        }
+
+        public static Publisher? EditPublisher(SqliteConnection connection, Publisher publisher)
+        {
+            using (var command = new SqliteCommand())
+            {
+                command.Connection = connection;
+                try
+                {
+                    // Check if publisher exists
+                    command.CommandText = "SELECT 1 FROM Publisher WHERE ID = @id;";
+                    command.Parameters.AddWithValue("@id", publisher.Id);
+                    using (var reader = command.ExecuteReader())
+                    {
+                        if (!reader.HasRows)
+                        {
+                            Console.WriteLine($"Publisher with ID {publisher.Id} does not exist.");
+                            return null;
+                        }
+                    }
+
+                    // Update publisher
+                    command.CommandText = @"UPDATE Publisher 
+                                       SET Name = @name, State = @state 
+                                       WHERE ID = @id;";
+                    command.Parameters.Clear();
+                    command.Parameters.AddWithValue("@name", publisher.Name);
+                    command.Parameters.AddWithValue("@state", publisher.State);
+                    command.Parameters.AddWithValue("@id", publisher.Id);
+                    command.ExecuteNonQuery();
+
+                    // Retrieve updated publisher
+                    command.CommandText = "SELECT ID, Name, State FROM Publisher WHERE ID = @id;";
+                    command.Parameters.Clear();
+                    command.Parameters.AddWithValue("@id", publisher.Id);
+                    using (var reader = command.ExecuteReader())
+                    {
+                        if (reader.Read())
+                        {
+                            var updatedPublisher = new Publisher
+                            {
+                                Id = reader.GetInt32(0),
+                                Name = reader.GetString(1),
+                                State = reader.GetString(2)
+                            };
+                            Console.WriteLine("Publisher updated successfully.");
+                            return updatedPublisher;
+                        }
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"EditPublisher failed: {ex.Message}");
+                }
+            }
+            return null;
+        }
+
+        public static BookDto? EditBook(SqliteConnection connection, BookDto book)
+        {
+            using (var command = new SqliteCommand())
+            {
+                command.Connection = connection;
+                try
+                {
+                    // Check if book exists
+                    command.CommandText = "SELECT 1 FROM Books WHERE ID = @id;";
+                    command.Parameters.AddWithValue("@id", book.Id);
+                    using (var reader = command.ExecuteReader())
+                    {
+                        if (!reader.HasRows)
+                        {
+                            Console.WriteLine($"Book with ID {book.Id} does not exist.");
+                            return null;
+                        }
+                    }
+
+                    // Check if author exists
+                    command.CommandText = "SELECT 1 FROM Authors WHERE ID = @aid;";
+                    command.Parameters.Clear();
+                    command.Parameters.AddWithValue("@aid", book.Author.Id);
+                    using (var reader = command.ExecuteReader())
+                    {
+                        if (!reader.HasRows)
+                        {
+                            Console.WriteLine($"Author with ID {book.Author.Id} does not exist.");
+                            return null;
+                        }
+                    }
+
+                    // Check if publisher exists
+                    command.CommandText = "SELECT 1 FROM Publisher WHERE ID = @pid;";
+                    command.Parameters.Clear();
+                    command.Parameters.AddWithValue("@pid", book.Publisher.Id);
+                    using (var reader = command.ExecuteReader())
+                    {
+                        if (!reader.HasRows)
+                        {
+                            Console.WriteLine($"Publisher with ID {book.Publisher.Id} does not exist.");
+                            return null;
+                        }
+                    }
+
+                    // Update book
+                    command.CommandText = @"UPDATE Books 
+                                       SET Name = @name, AuthorID = @author, PublisherID = @publisher, 
+                                           YearOfRelease = @year, Total = @total 
+                                       WHERE ID = @id;";
+                    command.Parameters.Clear();
+                    command.Parameters.AddWithValue("@name", book.Name);
+                    command.Parameters.AddWithValue("@author", book.Author.Id);
+                    command.Parameters.AddWithValue("@publisher", book.Publisher.Id);
+                    command.Parameters.AddWithValue("@year", book.YearOfRelease);
+                    command.Parameters.AddWithValue("@total", book.Total);
+                    command.Parameters.AddWithValue("@id", book.Id);
+                    command.ExecuteNonQuery();
+
+                    // Retrieve updated book with joins
+                    command.CommandText = @"SELECT b.ID, b.Name, b.YearOfRelease, b.Total,
+                                              a.ID, a.Name, a.Surname, a.DateOfBirth,
+                                              p.ID, p.Name, p.State
+                                       FROM Books b
+                                       JOIN Authors a ON b.AuthorID = a.ID
+                                       JOIN Publisher p ON b.PublisherID = p.ID
+                                       WHERE b.ID = @id;";
+                    command.Parameters.Clear();
+                    command.Parameters.AddWithValue("@id", book.Id);
+                    using (var reader = command.ExecuteReader())
+                    {
+                        if (reader.Read())
+                        {
+                            var updatedBook = new BookDto
+                            {
+                                Id = reader.GetInt32(0),
+                                Name = reader.GetString(1),
+                                YearOfRelease = reader.GetInt32(2),
+                                Total = reader.GetInt32(3),
+                                Author = new AuthorDto
+                                {
+                                    Id = reader.GetInt32(4),
+                                    Name = reader.GetString(5),
+                                    Surname = reader.GetString(6),
+                                    DateOfBirth = DateTime.Parse(reader.GetString(7))
+                                },
+                                Publisher = new Publisher
+                                {
+                                    Id = reader.GetInt32(8),
+                                    Name = reader.GetString(9),
+                                    State = reader.GetString(10)
+                                }
+                            };
+                            Console.WriteLine("Book updated successfully.");
+                            return updatedBook;
+                        }
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"EditBook failed: {ex.Message}");
+                }
+            }
+            return null;
+        }
+
+        public static UserDto? EditUser(SqliteConnection connection, UserDto user)
+        {
+            using (var command = new SqliteCommand())
+            {
+                command.Connection = connection;
+                try
+                {
+                    // Check if user exists
+                    command.CommandText = "SELECT 1 FROM Users WHERE ID = @id;";
+                    command.Parameters.AddWithValue("@id", user.Id);
+                    using (var reader = command.ExecuteReader())
+                    {
+                        if (!reader.HasRows)
+                        {
+                            Console.WriteLine($"User with ID {user.Id} does not exist.");
+                            return null;
+                        }
+                    }
+
+                    // Update user
+                    command.CommandText = @"UPDATE Users 
+                                       SET Name = @name, Surname = @surname 
+                                       WHERE ID = @id;";
+                    command.Parameters.Clear();
+                    command.Parameters.AddWithValue("@name", user.Name);
+                    command.Parameters.AddWithValue("@surname", user.Surname);
+                    command.Parameters.AddWithValue("@id", user.Id);
+                    command.ExecuteNonQuery();
+
+                    // Retrieve updated user
+                    command.CommandText = "SELECT ID, Name, Surname FROM Users WHERE ID = @id;";
+                    command.Parameters.Clear();
+                    command.Parameters.AddWithValue("@id", user.Id);
+                    using (var reader = command.ExecuteReader())
+                    {
+                        if (reader.Read())
+                        {
+                            var updatedUser = new UserDto
+                            {
+                                Id = reader.GetInt32(0),
+                                Name = reader.GetString(1),
+                                Surname = reader.GetString(2)
+                            };
+                            Console.WriteLine("User updated successfully.");
+                            return updatedUser;
+                        }
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"EditUser failed: {ex.Message}");
+                }
+            }
+            return null;
+        }
+    }
+
+}

src/team4.cs

@@ -0,0 +1,334 @@
+using System;
+using Microsoft.Data.Sqlite;
+using Database.Dto;
+
+
+namespace Team4
+{
+    public class Team4
+    {
+        public static List<BookDto> GetBooksByName(SqliteConnection conn, string name)
+        {
+            try
+            {
+                using (var command = conn.CreateCommand())
+                {
+                    command.CommandText = @"
+                        SELECT book.ID, book.Name, book.YearOfRelease, book.Total,
+                            author.ID, author.Name, author.Surname, author.DateOfBirth,
+                            publisher.ID, publisher.Name, publisher.State
+                        FROM Books book
+                        LEFT JOIN Authors author ON book.AuthorID = author.ID
+                        LEFT JOIN Publisher publisher ON book.PublisherID = publisher.ID
+                        WHERE book.Name = @name;";
+                    command.Parameters.AddWithValue("@name", name);
+
+                    var books = new List<BookDto>();
+                    using (var reader = command.ExecuteReader())
+                    {
+                        while (reader.Read())
+                        {
+                            var book = new BookDto
+                            {
+                                Id = reader.GetInt32(0),
+                                Name = reader.GetString(1),
+                                YearOfRelease = reader.IsDBNull(2) ? 0 : reader.GetInt32(2),
+                                Total = reader.IsDBNull(3) ? 0 : reader.GetInt32(3),
+                                Author = new AuthorDto
+                                {
+                                    Id = reader.IsDBNull(4) ? 0 : reader.GetInt32(4),
+                                    Name = reader.IsDBNull(5) ? "" : reader.GetString(5),
+                                    Surname = reader.IsDBNull(6) ? "" : reader.GetString(6),
+                                    DateOfBirth = reader.IsDBNull(7) ? DateTime.MinValue : reader.GetDateTime(7)
+                                },
+                                Publisher = new Publisher
+                                {
+                                    Id = reader.IsDBNull(8) ? 0 : reader.GetInt32(8),
+                                    Name = reader.IsDBNull(9) ? "" : reader.GetString(9),
+                                    State = reader.IsDBNull(10) ? "" : reader.GetString(10)
+                                }
+                            };
+                            books.Add(book);
+                        }
+                    }
+                    return books;
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error in GetBooksByName: {ex.Message}");
+                throw;
+            }
+        }
+        public static List<BookDto> GetBooksByAuthor(SqliteConnection conn, AuthorDto author)
+        {
+            try
+            {
+                using (var command = conn.CreateCommand())
+                {
+                    command.CommandText = @"
+                        SELECT book.ID, book.Name, book.YearOfRelease, book.Total,
+                            publisher.ID, publisher.Name, publisher.State
+                        FROM Books book
+                        LEFT JOIN Publisher publisher ON book.PublisherID = publisher.ID
+                        WHERE book.AuthorID = @id;";
+                    command.Parameters.AddWithValue("@id", author.Id);
+
+                    var books = new List<BookDto>();
+
+                    using (var reader = command.ExecuteReader())
+                    {
+                        while (reader.Read())
+                        {
+                            books.Add(new BookDto
+                            {
+                                Id = reader.GetInt32(0),
+                                Name = reader.GetString(1),
+                                YearOfRelease = reader.IsDBNull(2) ? 0 : reader.GetInt32(2),
+                                Total = reader.IsDBNull(3) ? 0 : reader.GetInt32(3),
+                                Author = author,
+                                Publisher = new Publisher
+                                {
+                                    Id = reader.IsDBNull(4) ? 0 : reader.GetInt32(4),
+                                    Name = reader.IsDBNull(5) ? "" : reader.GetString(5),
+                                    State = reader.IsDBNull(6) ? "" : reader.GetString(6)
+                                }
+                            });
+                        }
+                    }
+                    return books;
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error in GetBooksByAuthor: {ex.Message}");
+                throw;
+            }
+        }
+
+        public static List<BookDto> GetBooksByAvailableBooks(SqliteConnection conn, int minStock = 1)
+        {
+            try
+            {
+                using (var command = conn.CreateCommand())
+                {
+                    command.CommandText = @"
+                        SELECT book.ID, book.Name, book.YearOfRelease, book.Total
+                        FROM Books book
+                        WHERE book.Total >= @min;";
+                    command.Parameters.AddWithValue("@min", minStock);
+
+                    var books = new List<BookDto>();
+
+                    using (var reader = command.ExecuteReader())
+                    {
+                        while (reader.Read())
+                        {
+                            books.Add(new BookDto
+                            {
+                                Id = reader.GetInt32(0),
+                                Name = reader.GetString(1),
+                                YearOfRelease = reader.IsDBNull(2) ? 0 : reader.GetInt32(2),
+                                Total = reader.IsDBNull(3) ? 0 : reader.GetInt32(3)
+                            });
+                        }
+                    }
+                    return books;
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error in GetBooksByAvailableBooks: {ex.Message}");
+                throw;
+            }
+        }
+
+        public static List<BookDto> GetStolenBooks(SqliteConnection conn)
+        {
+            try
+            {
+                using (var command = conn.CreateCommand())
+                {
+                    command.CommandText = @"
+                        SELECT book.ID, book.Name, book.YearOfRelease, book.Total
+                        FROM Borrows borrow
+                        INNER JOIN Books book ON borrow.BookID = book.ID
+                        WHERE borrow.DateOfReturn IS NULL AND borrow.ReturnDue < DATE('now');";
+
+                    var books = new List<BookDto>();
+                    using (var reader = command.ExecuteReader())
+                    {
+                        while (reader.Read())
+                        {
+                            books.Add(new BookDto
+                            {
+                                Id = reader.GetInt32(0),
+                                Name = reader.GetString(1),
+                                YearOfRelease = reader.IsDBNull(2) ? 0 : reader.GetInt32(2),
+                                Total = reader.IsDBNull(3) ? 0 : reader.GetInt32(3)
+                            });
+                        }
+                    }
+                    return books;
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error in GetStolenBooks: {ex.Message}");
+                throw;
+            }
+        }
+
+        public static List<BookDto> GetStolenBooksByUser(SqliteConnection conn, UserDto user)
+        {
+            try
+            {
+                using (var command = conn.CreateCommand())
+                {
+                    command.CommandText = @"
+                        SELECT book.ID, book.Name, book.YearOfRelease, book.Total
+                        FROM Borrows borrow
+                        INNER JOIN Books book ON borrow.BookID = book.ID
+                        WHERE borrow.UserID = @uid AND borrow.DateOfReturn IS NULL AND borrow.ReturnDue < DATE('now');";
+                    command.Parameters.AddWithValue("@uid", user.Id);
+
+                    var books = new List<BookDto>();
+                    using (var reader = command.ExecuteReader())
+                    {
+                        while (reader.Read())
+                        {
+                            books.Add(new BookDto
+                            {
+                                Id = reader.GetInt32(0),
+                                Name = reader.GetString(1),
+                                YearOfRelease = reader.IsDBNull(2) ? 0 : reader.GetInt32(2),
+                                Total = reader.IsDBNull(3) ? 0 : reader.GetInt32(3)
+                            });
+                        }
+                    }
+                    return books;
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error in GetStolenBooksByUser: {ex.Message}");
+                throw;
+            }
+        }
+
+        public static AuthorDto GetAuthorById(SqliteConnection conn, int authorID)
+        {
+            try
+            {
+                using (var command = conn.CreateCommand())
+                {
+                    command.CommandText = @"
+                        SELECT *
+                        FROM Authors author
+                        WHERE author.ID = @aid;";
+                    command.Parameters.AddWithValue("@aid", authorID);
+
+                    using (var reader = command.ExecuteReader())
+                    {
+                        while (reader.Read())
+                        {
+                            return new AuthorDto
+                            {
+                                Id = reader.GetInt32(0),
+                                Name = reader.GetString(1),
+                                Surname = reader.GetString(2),
+                                DateOfBirth = reader.GetDateTime(3)
+                            };
+                        }
+                    }
+                    return null;
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error in GetAuthorById: {ex.Message}");
+                throw;
+            }
+        }
+        public static List<Dictionary<int, string[]>> GetAuthorNameId(SqliteConnection conn)
+        {
+            try
+            {
+                using (var command = conn.CreateCommand())
+                {
+                    command.CommandText = @"
+                        SELECT author.ID, author.Name, author.Surname
+                        FROM Authors author";
+
+                    var authors = new List<Dictionary<int, string[]>>();
+
+                    using (var reader = command.ExecuteReader())
+                    {
+                        while (reader.Read())
+                        {
+                            int id = reader.GetInt32(0);
+                            string name = reader.IsDBNull(1) ? "" : reader.GetString(1);
+                            string surname = reader.IsDBNull(2) ? "" : reader.GetString(2);
+
+                            authors.Add(new Dictionary<int, string[]>
+                            {
+                                { id, new[] { name, surname } }
+                            });
+                        }
+                    }
+                    return authors;
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error in GetAuthorNameId: {ex.Message}");
+                throw;
+            }
+        }
+
+        public static List<Dictionary<int, string>> GetPublisherNameId(SqliteConnection conn)
+        {
+            try
+            {
+                using (var command = conn.CreateCommand())
+                {
+                    command.CommandText = @"
+                        SELECT publisher.ID, publisher.Name
+                        FROM Publisher publisher";
+
+                    var publishers = new List<Dictionary<int, string>>();
+
+                    using (var reader = command.ExecuteReader())
+                    {
+                        while (reader.Read())
+                        {
+                            int id = reader.GetInt32(0);
+                            string name = reader.IsDBNull(1) ? "" : reader.GetString(1);
+
+                            publishers.Add(new Dictionary<int, string>
+                            {
+                                { id, name }
+                            });
+                        }
+                    }
+                    return publishers;
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Error in GetAuthorNameId: {ex.Message}");
+                throw;
+            }
+        }
+
+        public static void GetBooksBy(SqliteConnection conn)
+        {
+            throw new NotImplementedException();
+        }
+
+        public static void GetBorrowLogBy(SqliteConnection conn)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}