idea连接mysql数据库增删改查

import java.sql.*;

public class Main {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "root";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            String sql = "INSERT INTO users (name, email) VALUES (?, ?)";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, "John Doe");
            pstmt.setString(2, "john@example.com");
            int rowsInserted = pstmt.executeUpdate();
            System.out.println(rowsInserted + " row(s) inserted.");
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

String sql = "DELETE FROM users WHERE id = ?";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, 1); // 删除id为1的用户
int rowsDeleted = pstmt.executeUpdate();
System.out.println(rowsDeleted + " row(s) deleted.");

String sql = "UPDATE users SET email = ? WHERE id = ?";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, "newemail@example.com");
pstmt.setInt(2, 1); // 更新id为1的用户邮箱
int rowsUpdated = pstmt.executeUpdate();
System.out.println(rowsUpdated + " row(s) updated.");

String sql = "SELECT id, name, email FROM users";
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(sql);

while (rs.next()) {
    int id = rs.getInt("id");
    String name = rs.getString("name");
    String email = rs.getString("email");
    System.out.println("ID: " + id + ", Name: " + name + ", Email: " + email);
}