java连接mysql 增删改

import java.sql.*;

public class JDBCDemo {
    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        try {
            // 加载MySQL驱动程序
            Class.forName("com.mysql.cj.jdbc.Driver");
            // 获取数据库连接
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "password");
            // 创建Statement对象
            stmt = conn.createStatement();
            
            // 插入记录
            String insertSql = "INSERT INTO users (name, age) VALUES ('张三', 25)";
            stmt.executeUpdate(insertSql);
            
            // 更新记录
            String updateSql = "UPDATE users SET age = 26 WHERE name = '张三'";
            stmt.executeUpdate(updateSql);
            
            // 删除记录
            String deleteSql = "DELETE FROM users WHERE name = '张三'";
            stmt.executeUpdate(deleteSql);
            
        } catch (ClassNotFoundException | SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}