java - 创建事件以删除表中的记录

Question

我正在尝试让我的 mysql 事件正常工作，但我遇到的问题是在没有 autoDelete 事件的情况下创建总线表，并且我没有收到任何错误。我通过在 sql 浏览器中执行此语句 show events 检查了 phpmyadmin 中的表，我得到的结果是空结果，因为我说总线表在那里？!

我在 phpmyadmin sql 浏览器中检查了 EVENT 语法代码，它有效吗？

DatabaseMetaData dbm = con.getMetaData();
        ResultSet tables = dbm.getTables(null, null, "bus", null);
        if (tables.next()) {
            // here if the table exist just update data. I have the most of my code her.
            return status;
        } else {
            // Create bus table
            stt.execute("CREATE TABLE IF NOT EXISTS bus"
                    + "(id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,"
                    + "mac VARCHAR(30) NOT NULL UNIQUE,"
                    + "route int(11) NOT NULL,"
                    + "latitude FLOAT(10,6) NOT NULL,"
                    + "longitude FLOAT(10,6) NOT NULL,"
                    + "created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP)");

        stt.execute("CREATE EVENT AutoDelete"
                    + "ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 3 MINUTE "
                    + "DO "
                    + "DELETE FROM bus WHERE created_at < (NOW() - INTERVAL 3 MINUTE)");
            insert_update_data(mac, route, latD, longD, con);
            return status;

        }

Answer 1

尝试在事件名称后添加空格

"CREATE EVENT AutoDelete "

我认为您的代码当前正在创建一个如下所示的字符串:

CREATE EVENT AutoDeleteON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 3 MINUTE DO DELETE FROM bus WHERE created_at < (NOW() - INTERVAL 3 MINUTE)

虽然我很惊讶这没有抛出 SQLException