mybatis 如何通过resultMap 返回long
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mybatis resultMap 返回long
<resultMap id="ResultOfLong" type="java.lang.Long">
<result column="budget" property="budget" javaType="long"/>
</resultMap> mybatis long 类型返回为null报异常
Mapper method 'com.mpn.dao.TWeatherMapper.avgWeatherTemperature attempted to return null from a method with a primitive return type (long).
<select id="avgWeatherTemperature" resultType="java.lang.Long" parameterType="java.lang.String" >
SELECT IFNULL(AVG(WeatherTemperature),0) AS OrderAverage FROM t_weather WHERE WeatherDate= #{date,jdbcType=VARCHAR};
</select>
<select id="sumWeatherRainfall" resultType="java.lang.Long" parameterType="java.lang.String" >
SELECT SUM(WeatherTemperature) AS OrderAverage FROM t_weather WHERE WeatherDate= #{date,jdbcType=VARCHAR};
</select>
<select id="avghumidity" resultType="java.lang.Long" parameterType="java.lang.String" >
SELECT IFNULL(AVG(WeatherHumidity),0) AS OrderAverage FROM t_weather WHERE WeatherDate= #{date,jdbcType=VARCHAR};
</select>由于返回为空long中没有此类型所以抛异常，改为
<!-- 根据日期来进行计算平局值与 -->
<select id="avgWeatherTemperature" resultType="java.lang.Long" parameterType="java.lang.String" >
SELECT IFNULL(AVG(WeatherTemperature),0) AS OrderAverage FROM t_weather WHERE WeatherDate= #{date,jdbcType=VARCHAR};
</select>
<select id="sumWeatherRainfall" resultType="java.lang.Long" parameterType="java.lang.String" >
SELECT IFNULL(SUM(WeatherTemperature),0) AS OrderAverage FROM t_weather WHERE WeatherDate= #{date,jdbcType=VARCHAR};
</select>
<select id="avghumidity" resultType="java.lang.Long" parameterType="java.lang.String" >
SELECT IFNULL(AVG(WeatherHumidity),0) AS OrderAverage FROM t_weather WHERE WeatherDate= #{date,jdbcType=VARCHAR};
</select>用IFNULL来进行判断！
以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
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