注解开发中一对一关系的处理方式

Posted 2020-11-22 newcityboy

package com.hope.dao;

import com.hope.domain.Account;
import org.apache.ibatis.annotations.One;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.mapping.FetchType;

import java.util.List;

/**
 * @author newcityman
 * @date 2019/11/17 - 19:50
 */
public interface IAccountDao {
    /**
     * 查询所有账户信息
     */
    @Select("select * from account")
   @Results( id = "accountMap",value={
           @Result(id=true,column = "id",property = "id"),
           @Result(column = "uid",property = "uid"),
           @Result(column = "money",property = "money"),
           @Result(column = "uid",property = "user",
           one=@One(select = "com.hope.dao.IUserDao.findOne",
               fetchType = FetchType.EAGER
           ))
   })
    public List<Account> findAll();
}

package com.hope.test;

import com.hope.dao.IAccountDao;
import com.hope.domain.Account;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.InputStream;
import java.util.List;

/**
 * @author newcityman
 * @date 2019/11/17 - 20:02
 */
public class AccountTest {
    private InputStream in;
    private SqlSessionFactory factory;
    private SqlSession sqlSession;
    private IAccountDao accountDao;

    @Before
    public void init() throws Exception {
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        factory = new SqlSessionFactoryBuilder().build(in);
        sqlSession = factory.openSession();
        accountDao = sqlSession.getMapper(IAccountDao.class);
    }
   @After
    public void destroy()throws  Exception{
        sqlSession.close();
        in.close();
    }

    @Test
    public void testFindAll() {
        List<Account> accounts = accountDao.findAll();
        for(Account account:accounts){
            System.out.println(account);
            System.out.println(account.getUser());
        }
    }
}