List<String> list=entitys.stream().map(x->x.getB().getAddress()).collect(Collectors.toList());;returnlist; } } 三,调用 List<Target> list = MyMapper.INSTANCE.convertList(List<Source>);
该Mapper有一个查询学生信息的方法对应studentMapper.xml里的selectStudentDetails。通过联合查询返回stuDtoResultMap,这是个resulMap类型,type="com.example.chapter3.dto.StudentDto"是学生的详细信息实体类,其中的 <collection property="courses" ofType="com.example.chapter3.model.Course" column="student_id" sele...
@Mapping(target= "uname", source = "sname")//多个属性不对应可以用 "," 隔开编写多个@Mapping//,@Mapping(target = "uname", source = "sname")}) User studentToUser(Student student); } (2) 转换集合list 当user 和 student 都是集合形式list 时应当如下转换 转化List<> 集合时必须有 实体转化,...
关于mapper层使用@Param注解(@Param的使用) 因为java没有保存行参的记录,所有java在运行的时候会把例如List queryAll(int offset,int limit);中的参数变成这样:queryAll(int arg0,int arg1),这样我们就没有办法去传递多个参数。所以需要使用@Param注解给方法参数命名,然后在xml文件的该dao层方法对应的sql语句中就可...
andEqualTo("userId",user.getUserId()); List<Orders> ordersList = orderDAO.selectByExample(example1); //3.将查询到订单集合设置到user user.setOrdersList(ordersList); System.out.println(user); } 也可自定义连接查询,在DAO接口中自定义方法,创建Mapper文件 六、逆向工程 逆向工程,根据创建好的数据...
java stream 返回map中所有的value对象集合 mapper 返回一个list,Mybatis查询结果返回Map、List<Map>、Pair0.测试数据1.查询返回单个结果1.1.返回单个MapPoemMapper.xmlPoemMapper.javaPoemMapperTest.java输出结果1.2.返回单个LinkedHashMapPoemMapper.xmlPoemMappe
com.microsoft.azure.elasticdb.shard.mapper.ListShardMapper public class ListShardMapper extends BaseShardMapper implements IShardMapper<PointMapping, Object> Mapper from single keys (points) to their corresponding shards. Constructor Summary 展开表 ...
public class ListShardMapper extends BaseShardMapper implements IShardMapper<PointMapping, Object>Mapper from single keys (points) to their corresponding shards.Constructor Summary 展開資料表 ConstructorDescription ListShardMapper(ShardMapManager shardMapManager, ShardMap sm) List shard mapper, which ...
AutoConfigurationPackages.has(this.beanFactory)){logger.debug("Could not determine auto-configuration package, automatic mapper scanning disabled.");return;}logger.debug("Searching for mappers annotated with @Mapper");// 获取自动扫描的路径List<String>packages=AutoConfigurationPackages.get(this.beanFactory...
sql.append("<bind name=\"listNotEmptyCheck\"value=\"@tk.mybatis.mapper.util.OGNL@notEmptyCollectionCheck(list, '"+ms.getId() +" 方法参数为空')\"/>"); sql.append(SqlHelper.insertIntoTable(entityClass,tableName(entityClass)));