Verify DAO

DAO verify
a package created in a DAO DAO interface, XxxDao.
Method: List <Xxx> queryXxx () ;
while introducing two packages:
util.list and com.xxx.xxx.entity.Xxx ;
. In two sric / main create the corresponding / resources / mapper xml file folder achieve DAO interface

1. First added

<?xml version="1.0" encoding="UTF-8" ?> 
<!DOCTYPE configuration  PUBLIC "-//mybatis.org//DTD mapper 3.0//EN"  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

2. Write code that implements the interface

<mapper namespace="com.xxx.xxx.dao.XxxDao(DAO接口的位置)">
(以下为查询语句，首先数据库中要有数据才能查询)
<select id="接口中的方法名" resultType="(希望当条记录返回值的类型)com.xxx.xxx.entity.Xxx">
 SELECT xxx,xxx,xxx,xxx,xxx,xxx(数据库字段名)
 FROM xxx(数据表名)
 ORDER BY xxx DESC(按照权重xxx降序排列，最大的最先查询出来，排在最前面)
</select>
 </mapper>

III. Unit test
1. Create a com.xxx.xxx.dao package in src / test / java and create a class in which, XxxDaoTest.java
2. com.xxx in src / test / java in. xxx package to create a base class BaseTest.java (Junit integrated to configure the spring and, when the container is loaded SpringIOC Junit startup)
content:

import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
//告诉junit spring配置文件的位置
@ContextConfiguration({"classpath:spring/spring-dao.xml"})
public class BaseTest{

}

3.XxxDaoTest.java written content

首先这个类extends BaseTest
@Autowired
//注入接口的实体类，里面有方法queryXxx
private XxxDao xxxDao;

@Test
public void testQueryXxx{
  //用一个<Xxx>的List集合来接受queryXxx方法查询到的结果
  List<Xxx> xxxList = xxxDao.queryXxx();
  //判断取出来的数据为n个的话，则测试成功
  assertEquals(n,xxxList.size());
}

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