Question

mybatis 怎么 返回 null 值 返回类型 是个map

Answer 1

创建mybatis-config.xml

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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<!-- 当返回数据类型为map，设置callSettersOnNulls会把值为null的key也返回 -->
<setting name="callSettersOnNulls" value="true"/>
</settings>
</configuration>

在配置数据源的配置文件中，配置Mybatis的SqlSessionFactoryBean

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<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:/META-INF/spring/mybatis-config.xml" />
<property name="mapperLocations">
<array>
　　<value>classpath*:/yunnex/saofu/shop/beibao/mappe