mysql➕java实现增删改查

可以使用Java中的JDBC（Java Database Connectivity） API与MySQL数据库进行交互，实现增删改查操作。下面是一个简单的示例代码：

1. 引入MySQL的JDBC驱动包，可以从官网下载或使用Maven进行依赖管理。

2. 使用JDBC连接MySQL数据库，需要指定数据库的URL、用户名和密码。

// 加载驱动类
Class.forName("com.mysql.jdbc.Driver");

// 获取数据库连接
String url = "jdbc:mysql://localhost:3306/test";
String username = "root";
String password = "root";
Connection conn = DriverManager.getConnection(url, username, password);

3. 实现增删改查操作。

// 新增操作
String sql = "INSERT INTO user(name, age) VALUES (?, ?)";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, "Tom");
ps.setInt(2, 20);
ps.executeUpdate();

// 修改操作
String sql = "UPDATE user SET age = ? WHERE name = ?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setInt(1, 21);
ps.setString(2, "Tom");
ps.executeUpdate();

// 删除操作
String sql = "DELETE FROM user WHERE name = ?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, "Tom");
ps.executeUpdate();

// 查询操作
String sql = "SELECT * FROM user WHERE age > ?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setInt(1, 18);
ResultSet rs = ps.executeQuery();
while (rs.next()) {
    String name = rs.getString("name");
    int age = rs.getInt("age");
    System.out.println("Name: " + name + ", Age: " + age);
}

完整代码示例：

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

public class JdbcDemo {

    public static void main(String[] args) throws Exception {
        // 加载驱动类
        Class.forName("com.mysql.jdbc.Driver");

        // 获取数据库连接
        String url = "jdbc:mysql://localhost:3306/test";
        String username = "root";
        String password = "root";
        Connection conn = DriverManager.getConnection(url, username, password);

        // 新增操作
        String sql = "INSERT INTO user(name, age) VALUES (?, ?)";
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setString(1, "Tom");
        ps.setInt(2, 20);
        ps.executeUpdate();

        // 修改操作
        sql = "UPDATE user SET age = ? WHERE name = ?";
        ps = conn.prepareStatement(sql);
        ps.setInt(1, 21);
        ps.setString(2, "Tom");
        ps.executeUpdate();

        // 删除操作
        sql = "DELETE FROM user WHERE name = ?";
        ps = conn.prepareStatement(sql);
        ps.setString(1, "Tom");
        ps.executeUpdate();

        // 查询操作
        sql = "SELECT * FROM user WHERE age > ?";
        ps = conn.prepareStatement(sql);
        ps.setInt(1, 18);
        ResultSet rs = ps.executeQuery();
        while (rs.next()) {
            String name = rs.getString("name");
            int age = rs.getInt("age");
            System.out.println("Name: " + name + ", Age: " + age);
        }

        // 关闭连接
        rs.close();
        ps.close();
        conn.close();
    }

}