BEGINSET @baseStr= "SELECT * FROM tbName WHERE 1=1 ";SET @_where="";IF 1=1 THEN　　SET @_where= CONCAT(@_where," AND sourcedomain=\"www.baidu.com\" ");END IF;IF 2=2 THEN 　　SET @_where=CONCAT(@_where," AND userId =4444");END IF;  SET @sentence =CONCAT(@baseStr,@_where) ; -- 连接字符串生成要执行的SQL语句  prepare stmt from @sentence; -- 预编释一下。 “stmt”预编释变量的名称，  execute stmt; -- 执行SQL语句  deallocate prepare stmt;    -- 释放资源END

 

2.out赋值

SET @_rowCount=0; -- 变量SET @_count =CONCAT("SELECT COUNT(*) INTO @_rowCount ",@baseStr,@_where);prepare stmt from @_count;execute stmt;deallocate prepare stmt;SET _pageCount=@_rowCount;