Mybatis查询多条记录并返回List集合的方法

实体对象如下:

/**
使用lobmok插件
*/
@Getter
@Setter
@NoArgsConstructor
@ToString
@EqualsAndHashCode
public class Vendor {
private String vend_id;
private String vend_name;
private String vend_address;
private String vend_city;
private String vend_state;
private String vend_zip;
private String vend_country;
}

XML映射文件如下:

<select id="findVendorAll" resultType="vendor">
select * from Vendors
</select>

接口文件方法如下:

//查询所有记录
List<Vendor> findVendorAll();

测试文件如下:

try {
String resource = "mybatis-config.xml";
InputStream resourceAsStream = Resources.getResourceAsStream(resource);
SqlSessionFactory build = new SqlSessionFactoryBuilder().build(resourceAsStream,"development2");
//获取SQLSession
SqlSession openSession = build.openSession();
VendorMapper mapper = openSession.getMapper(VendorMapper.class);
List<Vendors> findVendorAll = mapper.findVendorAll();

System.out.println(findVendorAll);

} catch (IOException e) {
System.out.println("加载配置文件失败");
e.printStackTrace();
}

笔记:

• XML中只需resultType属性值为实体对象别名或全路径名。

• mybatis会通过接口文件的返回值类型来判断返回的是集合还是对象。如果是对象，则按常规查询并返回；如果是List集合，mybatis则会将查询到的多条记录设置进集合中并返回。
  

来源：https://blog.csdn.net/u014268482/article/details/80570508