mysql 触发java代码

DELIMITER //
CREATE TRIGGER after_user_insert
AFTER INSERT ON user
FOR EACH ROW
BEGIN
    -- 调用存储过程来执行Java代码
    CALL execute_java_code(NEW.id);
END;
//
DELIMITER ;

DELIMITER //
CREATE PROCEDURE execute_java_code(IN user_id INT)
BEGIN
    -- 这里假设我们有一个名为execute_java_method的函数，它能够调用Java代码
    SELECT execute_java_method('send_welcome_email', user_id);
END;
//
DELIMITER ;

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

public class EmailSender {
    public static void sendWelcomeEmail(int userId) {
        try {
            // 连接到数据库
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "username", "password");

            // 调用存储过程
            String sql = "{call execute_java_code(?)}";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setInt(1, userId);
            pstmt.execute();

            // 关闭连接
            pstmt.close();
            conn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        // 假设这里是从触发器中调用的
        sendWelcomeEmail(1);
    }
}