java连接mysql数据库实例

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class MySQLConnectionExample {
    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);
            System.out.println("Connected to MySQL database!");
            conn.close();
        } catch (SQLException e) {
            System.out.println("Failed to connect to MySQL database.");
            e.printStackTrace();
        }
    }
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class MySQLPreparedStatementExample {
    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 = "SELECT * FROM users WHERE username = ?";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, "admin");
            pstmt.executeQuery();
            conn.close();
        } catch (SQLException e) {
            System.out.println("Failed to execute query.");
            e.printStackTrace();
        }
    }
}