刚开始玩mysql if条件等于具体值 的判断
mysql等于具体某值的判断时,要加上.toString()函数<if test="dataSort !=null and dataSort !='' and dataSort =='1'.toString()">
order byprice asc
</if>
<if test="dataSort == null or dataSort =='0'.toString()">
order byaddtime desc
</if>
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