mybatis判断集合为空或者元素个数为零 ,mybatis判断list为空或null,在xml文件中,持久层写法:
file file
<if test="questionIds!= null and questionIds.size()>0" > WHERE id in <foreach collection="questionIds" index="index" item="item" open="(" separator="," close=")"> #{item} </foreach> </if>
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