java如何编写操作mysql数据库增删改查？

在Java中操作MySQL数据库，通常使用JDBC（Java Database Connectivity）API。以下是一个简单的示例，展示了如何连接到MySQL数据库、执行增删改查操作。

import java.sql.*;

public class MySQLExample {
    // JDBC URL, username, and password of MySQL server
    static final String JDBC_URL = "jdbc:mysql://localhost:3306/mydb";
    static final String USER = "username";
    static final String PASS = "password";

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        try {
            // 1. Register JDBC driver
            Class.forName("com.mysql.cj.jdbc.Driver");

            // 2. Open a connection
            System.out.println("Connecting to database...");
            conn = DriverManager.getConnection(JDBC_URL, USER, PASS);

            // 3. Execute a query
            System.out.println("Creating statement...");
            stmt = conn.createStatement();

            // Insert operation
            String sqlInsert = "INSERT INTO employees (id, name, age, position) VALUES (1, 'John Doe', 30, 'Manager')";
            stmt.executeUpdate(sqlInsert);
            System.out.println("Inserted record into the table...");

            // Update operation
            String sqlUpdate = "UPDATE employees SET age = 31 WHERE id = 1";
       ...

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