mybatis, a type byte for comparison

                                                           mybatis, a type byte for comparison

  mybatis, a type byte for comparison. Only need to test! = Null on the line.

In mybatis in for if some conditions are, we often use the "test! = Null && teat! = ''", But for byte class, the only test! = Null on the line.

Not just beginning to be known, then spent half a day in the pit. . So here, we intend to conduct some understanding of the pit, in order to avoid later into the pit.

mybatis if the condition determination, which is a digital type numberType (int, long, double, float, Integer ...) like one (if its non-null character is determined, and this time the digital type is 0, then Here is the first one if not enter execution.

 

<where>

<if test="numberType!= null and numberType!=''">

AND NUMBER_TYPE = #{numberType}

</if>

<if test=" businessEndTime != '' and businessEndTime != null">

<![CDATA[AND BUSINESS_TIME <= TO_DATE(#{businessEndTime},'yyyy-mm-dd hh24:MI:SS')]]>

</if>

</where>

Digital type of non-null character judgment itself unreasonable, produced this irrational situation is understandable. 0 is as false, so it will not enter the conditions, and the type of business involved judgment not on the sql in java in judgment, or poor maintenance.

 

reference:

https://blog.csdn.net/lich1n/article/details/73511180