无论内部代码如何，mysql事务都会失败

Question

我正在尝试在mySQL中编写一个事务，但无论我在标记之间放置什么都有错误。

start transaction;
set @email = "FOO";
PRINT @email;
commit; 

此块总是会产生错误：

SQL Error [1064] [42000]: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'set @email_name = "FOO";
PRINT @email_name;
commit' at line 2
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'set @email_name = "FOO";
PRINT @email_name;
commit' at line 2

无论在事务中放置什么代码，都会发生此行为，如果有相关内容，则会出现此问题。

Answer 1

没有PRINT，请改用SELECT。