Php 在mysql中创建存储过程时显示语法错误 错误1064（42000）：您的SQL语法有错误；检查手册 对应于您的MySQL服务器版本，以便使用“from”附近的正确语法 tbl_PurchaseReturn详细信息 其中（purchaseDetailsId=p_purchaseDetailsId）’位于第5行

试试这个：

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 'from tbl_PurchaseReturnDetails where (purchaseDetailsId = p_purchaseDetailsId)' at line 5

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每个错误消息都显示可能的错误所在。
在你的例子中，它说，

。。。对于要使用near'from的正确语法
tbl_PurchaseReturnDetails…

当它在附近显示

时，表示错误在该特定语句之前。

因此，来自

的

前面的语句是错误的。你把右括号放错地方了

更改语句：

create procedure purchaseDetailsCheckOnDelete(p_purchaseDetailsId varchar(50))
begin
    declare p_Exist tinyint(1);
    set p_Exist = False ;
    select p_Exist = case  count(purchaseDetailsId) when '0' then False else True end  from tbl_PurchaseReturnDetails
    where purchaseDetailsId = p_purchaseDetailsId;
    select p_Exist ;

end

至：

select p_Exist =
  ( case count(purchaseDetailsId) when '0' then False else True end
from tbl_PurchaseReturnDetails
  where (purchaseDetailsId = p_purchaseDetailsId) );

如果决定使用括号，则缺少一个
select
，即

select p_Exist =
  ( case count(purchaseDetailsId) when '0' then False else True end )
from tbl_PurchaseReturnDetails
  where (purchaseDetailsId = p_purchaseDetailsId);


或者，放下支架

    select p_Exist = 
      (select case count(purchaseDetailsId) 


编辑

更简短的是：

    select p_Exist = case count(purchaseDetailsId) 
              when '0' then False else True end  
       from tbl_PurchaseReturnDetails
       where purchaseDetailsId = p_purchaseDetailsId;        

使用此代码段

    SELECT IFNULL((select 1 from tbl_PurchaseReturnDetails
       WHERE purchaseDetailsId = p_purchaseDetailsId), 0) AS p_Exist;

不可能。。（没有错误）
    SELECT IFNULL((select 1 from tbl_PurchaseReturnDetails
       WHERE purchaseDetailsId = p_purchaseDetailsId), 0) AS p_Exist;

delimiter //
drop procedure if exists purchaseDetailsCheckOnDelete;
create procedure purchaseDetailsCheckOnDelete(p_purchaseDetailsId varchar(50))
   begin
       declare p_Exist tinyint(1);
       set p_Exist = False ;
       select p_Exist = (case  count(purchaseDetailsId) when '0' then False else True end) as 'P_EXIST'
       from tbl_PurchaseReturnDetails
       where (purchaseDetailsId = p_purchaseDetailsId);
       select p_Exist ;
   end//