mybatis long 类型返回为null报异常
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2022-07-01 07:53:51
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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
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