【坑】mybatis将整数0识别为null

<if test="deviceNum != null and deviceNum !=''"> AND dev_num = #{deviceNum} </if> 当参数值为0时会过滤掉，此时应该为web <if test="deviceNum != null "> AND dev_num = #{deviceNum} </if> 缘由是， 通常判断的是String类型 mybatis源

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