mybatis resultMap返回long mybatis 怎样通过resultMap 返回long

qq_16055765 2021-07-22 我要评论

想了解mybatis 怎样通过resultMap 返回long的相关内容吗，qq_16055765在本文为您仔细讲解mybatis resultMap返回long的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：mybatis,resultMap,resultMap返回long，下面大家一起来学习吧。

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。

mybatis resultMap返回long mybatis 怎样通过resultMap 返回long

mybatis resultMap 返回long

mybatis long 类型返回为null报异常

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