attempted to return null from a method with a primitive return type (int).
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<select id="getMaxHitEventId" parameterType="string" resultType="int"> select max(app_hitEventID） from hits_tab_app where app_hitV=#{app_hitV}</select>mybatis+mysql查询出来会报如下错误：attempted to return null from a method with a primitive return type (int).
我的返回值类型为int，但是查询出来的结果有空值，所以会出现如上的异常，以下为解决办法：
1.当查询出来为空时，给赋值一个默认值：
select IFNULL(max(app_hitEventID),0) from hits_tab_app where app_hitV=#{app_hitV}2.将返回值类型改为Integer，然后由业务代码去进行判断：
<select id="getMaxHitEventId" parameterType="string" resultType="Integer"> select max(app_hitEventID） from hits_tab_app where app_hitV=#{app_hitV}</select>阅读全文
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