Mybatis_笔记

2017-03-10 本文已影响0人 bboymonk

mybatis-config.xml

1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 3  "http://mybatis.org/dtd/mybatis-3-config.dtd"> 
 4  
 5  <configuration>
 6      <properties resource="jdbc.properties">
 7          
 8      </properties>
 9      <environments default="development">
10          <environment id="development">
11             <transactionManager type="JDBC"/>         
12              <dataSource type="POOLED">
13                  <property name="driver" value="${driver}"/>
14                  <property name="url" value="${url}"/>
15                  <property name="username" value="${username}"/>
16                  <property name="password" value="${password}"/>
17              </dataSource>
18          </environment>
19      </environments>
20      
21      <mappers>
22          <mapper resource="dao/UserMapper.xml"/>
23      </mappers>
24  </configuration>

UserMapper.xml

1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 
 3 "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 
 4 
 5 <mapper namespace="dao.UserMapper">
 6     <select id="count" resultType="int">
 7         select count(1) from user
 8     </select>
 9     
10 </mapper>

UserTest

1 package test;
 2 
 3 import static org.junit.Assert.*;
 4 
 5 import java.io.IOException;
 6 import java.io.InputStream;
 7 
 8 import org.apache.ibatis.io.Resources;
 9 import org.apache.ibatis.session.SqlSession;
10 import org.apache.ibatis.session.SqlSessionFactory;
11 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
12 import org.apache.log4j.Logger;
13 import org.junit.Test;
14 
15 public class UserTest {
16     private Logger logger = Logger.getLogger(UserTest.class);
17         
18     @Test
19     public void countTest() {
20         String resource = "mybatis-config.xml";
21         int count = 0;
22         SqlSession sqlSession = null;
23         //1,读取配置文件mybatis-config.xml输入流
24         try {
25             InputStream is = Resources.getResourceAsStream(resource);
26             //2,创建sqlsessionfactory
27             SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
28             //3,创建sqlsession
29             sqlSession =     factory.openSession();
30             //4,调用mapper配置文件
31             count = sqlSession.selectOne("dao.UserMapper.count");
32             
33             logger.debug(count);
34         } catch (IOException e) {
35             e.printStackTrace();
36         }finally{
37             sqlSession.close();
38         }
39         
40         
41         
42     }
43 
44 }