mybatis返回map结果集 mybatis怎么返回一个map?
mybatis怎么返回一个map?
MapParam.java 需要mybatis返回Map时需要指定参数类型为MapParam,可以通过构造函数单独指定Key
mybatis如何返回list
Mapper里面返回List,就是说Mapper里面的方法声明是
public List
dao、service层也作相应修改,改为返回List
SELECT count(*) value, c. NAME label, ifnull(b.device_status, 0) device_status
FROM td01_device a
LEFT OUTER JOIN td06_device_status b ON a.id = b.device_id
LEFT OUTER JOIN td05_dd_device_status c ON c.ID = ifnull(b.device_status, 0)
GROUP BY ifnull(b.device_status, 0), c. NAME
ORDER BY device_status
public interface OnlineStatMapper {
public List
}
mybatis怎么返回null值返回类型是个map?
创建mybatis-config.xml123456789<?xmlversion="1.0"encoding="UTF-8"?><!DOCTYPEconfigurationPUBLIC"-//mybatis.org//DTDConfig3.0//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--><settingname="callSettersOnNulls"value="true"/></settings></configuration>在配置数据源的配置文件中,配置Mybatis的SqlSessionFactoryBean123456789<beanid="sqlSessionFactory"class="org.mybatis.spring.SqlSessionFactoryBean"><propertyname="dataSource"ref="dataSource"/><propertyname="configLocation"value="classpath:/META-INF/spring/mybatis-config.xml"/><propertyname="mapperLocations"><array> <value>classpath*:/yunnex/saofu/shop/beibao/mappe
mybatisselectmap方法怎么用?
mybatis selectMap方法返回指定列为key的map集合或对象,它的value值得类型可以为Object或map,在不绑定bean下默认为Map
mybatis返回map结果集 mybatis返回map集合的格式 mybatis返回类型为map
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