mybatis resultMap 返回long
|
1
2
3
|
<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).
|
1
2
3
4
5
6
7
8
9
10
11
|
<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
|
1
2
3
4
5
6
7
8
9
10
11
12
|
<!-- 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服务器之家。
原文链接：https://blog.csdn.net/qq_16055765/article/details/79665579
