Mysql存储过程中的动态查询不起作用

Question

我将一些现有的存​​储过程从SQL Server移到MySQL 5.1.67。

我在我的存储过程中使用动态查询，有时（随机但经常）我在执行动态查询时遇到错误，然后进入Exit Handler。我已经打印了动态查询，并且能够单独执行它而没有任何问题。 如果我做错了什么，任何人都可以告诉我。

这是我构建的动态查询 -

SELECT T1.`R_Approved By1` AS `R_Approved By1`, 
  CAST(DATE_FORMAT(STR_TO_DATE(T1.`R_Approved Date1`,'%m/%d/%Y'),'%m/%d/%Y') AS CHAR) AS `R_Approved Date1`, 
  T1.`R_Status1` AS `R_Status1`, 
  T1.`R_Comments1` AS `R_Comments1`, 
  T1.`R_Approved By2` AS `R_Approved By2`, 
  CAST(DATE_FORMAT(STR_TO_DATE(T1.`R_Approved Date2`,'%m/%d/%Y'),'%m/%d/%Y') AS CHAR) AS `R_Approved Date2`, 
  T1.`R_Status2` AS `R_Status2`, 
  T1.`R_Comments2` AS `R_Comments2`, 
  T1.`R_Approved By3` AS `R_Approved By3`, 
  CAST(DATE_FORMAT(STR_TO_DATE(T1.`R_Approved Date3`,'%m/%d/%Y'),'%m/%d/%Y') AS CHAR) AS `R_Approved Date3`, 
  T1.`R_Status3` AS `R_Status3`, 
  T1.`R_Comments3` AS `R_Comments3` 
FROM `GROUP_1` AS T1 
WHERE T1.ID = 2;