mybatis判断list不为空/大小的问题
目录
- mybatis判断list不为空
- mybatis判断两个集合是否为空
mybatis判断list不为空
<if test="status != null and status.size()>0" > and s.orderstatus in <foreach collection="status" item="listItem" open="(" close=")" separator="," > #{listItem} </foreach> </if>
建议对特殊字符进行处理
<if test="status != null and status.size() > 0" > and s.orderstatus in <foreach collection="status" item="listItem" open="(" close=")" separator="," > #{listItem} </foreach> </if>
mybatis判断两个集合是否为空
在工作中遇到mybatis中判断两个集合是否为空,不为空的话遍历;都为空执行 1=0 or 1=0,则查询出来空集合
select login,name,email from users u where <choose> <when test="sameEmailList != null and sameEmailList.size > 0 "> email in <foreach collection="sameEmailList" item="email" open="(" separator="," close=")"> #{email, jdbcType=VARCHAR} </foreach> </when> <otherwise> 1 = 0 </otherwise> </choose> <choose> <when test="sameNameList != null and sameNameList.size > 0"> or name in <foreach collection="sameNameList" item="name" open="(" separator="," close=")"> #{name, jdbcType=VARCHAR} </foreach> </when> <otherwise> or 1 = 0 </otherwise> </choose> ORDER by name, email ASC
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