java mysql锁表

// 设置锁等待超时时间为5秒
String url = "jdbc:mysql://localhost:3306/mydatabase?innodb_lock_wait_timeout=5";

-- 查看死锁信息
SHOW ENGINE INNODB STATUS;

// 使用行级锁
String sql = "SELECT * FROM mytable WHERE id = ? FOR UPDATE";

import java.sql.*;

public class LockExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            conn.setAutoCommit(false); // 开启事务

            String sql = "SELECT * FROM mytable WHERE id = ? FOR UPDATE";
            try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
                pstmt.setInt(1, 123);
                ResultSet rs = pstmt.executeQuery();

                // 处理结果集
                while (rs.next()) {
                    System.out.println(rs.getString("column_name"));
                }

                conn.commit(); // 提交事务
            } catch (SQLException e) {
                conn.rollback(); // 回滚事务
                e.printStackTrace();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}