main.go

package main

import (
	"database/sql"
	"fmt"

	_ "github.com/mattn/go-sqlite3"
)

func main() {
	db, err := sql.Open("sqlite3", "./books.db")
	if err != nil {
		panic(err)
	}
	defer db.Close()

	// Create books table
	createBooksTable := `
	CREATE TABLE IF NOT EXISTS books (
	id INTEGER PRIMARY KEY AUTOINCREMENT,
	TITLE TEXT,
	author TEXT,
	year INTEGER
	);`

	_, err = db.Exec(createBooksTable)
	if err != nil {
		panic(err)
	}

	fmt.Println("Books table created successfully.")

	createUsersTable := `
CREATE TABLE IF NOT EXISTS users (
id INTEGER PRIMARY KEY AUTOINCREMENT,
user TEXT NOT NULL UNIQUE,
password TEXT NOT NULL
);`
	_, err = db.Exec(createUsersTable)
	if err != nil {
		panic(err)
	}
	fmt.Println("Users table created.")

	// Example usage
	insertBook(db, "Go Programming", "Mosun", 2024)
	listsBooks(db)
	updateBookTitle(db, 1, "Go Programming Updated")
	deleteBook(db, 1)

	addUser(db, "mosun", "1234")
	loginUser(db, "mosun", "1234")

}

func insertBook(db *sql.DB, title, author string, year int) {
	stmt, _ := db.Prepare("INSERT INTO books(title, author, year) VALUES (?, ?, ?)")
	stmt.Exec(title, author, year)
	fmt.Println("Book inserted!")

}

func listsBooks(db *sql.DB) {
	rows, _ := db.Query("SELECT id, title, author, year FROM books")
	defer rows.Close()

	fmt.Println("Books:")
	for rows.Next() {
		var id, year int
		var title, author string
		rows.Scan(&id, &title, &author, &year)
		fmt.Printf("%d: %s by %s (%d)\n", id, title, author, year)
	}
}

func updateBookTitle(db *sql.DB, id int, newTitle string) {
	stmt, _ := db.Prepare("UPDATE books SET title = ? WHERE id = ?")
	stmt.Exec(newTitle, id)
	fmt.Println("Book updated.")
}

func deleteBook(db *sql.DB, id int) {
	stmt, _ := db.Prepare("DELETE FROM books WHERE id = ?")
	stmt.Exec(id)
	fmt.Println("Book deleted.")
}

func addUser(db *sql.DB, username, password string) {
	stmt, _ := db.Prepare("INSERT INTO users(username, password) VALUES (?, ?)")
	_, err := stmt.Exec(username, password)
	if err != nil {
		fmt.Println("Error:", err)

	} else {
		fmt.Println("User added.")
	}
}

func loginUser(db *sql.DB, username, password string) bool {
	var storePassword string
	row := db.QueryRow("SELECT password FROM users WHERE username = ?", username)
	err := row.Scan(&storePassword)
	if err != nil {
		fmt.Println("Login failed: User not found.")
		return false
	}

	if storePassword == password {
		fmt.Println("Login successful!")
		return true
	}

	fmt.Println("Login failed: Incorrect password.")
	return false
}