如何在MySQL中的单引号中执行select Query

Question

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

上面的查询RefID中的

是过程中的参数 和RefID值是'DelFlg = 0和EnquirySource = 3'

那么如何在MYSQL中执行Q1？

Answer 1

试试这个：

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

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