mybatis 中if判断把零识别为null

<!-- java代码中传递的整数0在mybatis中被识别成null-->
<if test="maps.pay_amount !=null and maps.pay_amount !='' or maps.pay_amount == 0">
	pay_amount=#{maps.pay_amount},
</if>
<if test="maps.parking_amount !=null and maps.parking_amount !='' or maps.parking_amount == 0">
	parking_amount=#{maps.parking_amount},
</if>

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