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mysql query 条件中为空时忽略

时间:2018-05-16 11:36:15      阅读:335      评论:0      收藏:0      [点我收藏+]
1.    q.ques_group传入为null或‘‘的时候不查询此条件:
          value = "SELECT *             FROM question q WHERE  1=1 AND (q.ques_group = :quesGroup or :quesGroup is null or :quesGroup=‘‘) AND q.type = :type",

        1: (q.ques_group = :quesGroup or :quesGroup is null or :quesGroup=‘‘)
        2: (q.ques_group = ISNULL(:quesGroup, q.ques_group) OR q.ques_group = (CASE WHEN :quesGroup = ‘‘ THEN q.ques_group ELSE :quesGroup END)) :分解:
            SELECT *             FROM question q WHERE  
            1=1 AND (q.ques_group = IFNULL(:quesGroup, q.ques_group) OR q.ques_group = (CASE WHEN :quesGroup = ‘‘ THEN q.ques_group ELSE :quesGroup END)) 
            AND q.type = :type",
        3WHERE       (@AgentID=‘‘) OR (@AgentID<>‘‘ AND  A.AgentID = @AgentID)     

 

mysql query 条件中为空时忽略

原文:https://www.cnblogs.com/hahajava/p/9044909.html

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