正文
mysql query 条件中为空时忽略
小程序：扫一扫查出行【扫一扫了解最新限行尾号】
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☆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",
3：WHERE (@AgentID='') OR (@AgentID<>'' AND A.AgentID = @AgentID)
