如何在MySQL中使用单引号执行选择查询

Question

set Q1= 'SELECT ID, EnquiryID, EnquiryDate, CompanyName, ContactPerson FROM EnquiryHeader WHERE ';
set Q1 = concat(Q1,RefID);

以上查询中的RefID是过程中的参数，并且RefID值为'DelFlg = 0和EnquirySource = 3'

那么如何在MYSQL中执行Q1？

Answer 1

尝试这个：

set @Q1 = CONCAT('SELECT ID, EnquiryID, EnquiryDate, CompanyName, ContactPerson FROM Syscon.EnquiryHeader WHERE ',RefID);

PREPARE makeQ FROM @Q1;
EXECUTE makeQ;
DEALLOCATE PREPARE makeQ;