mybatis的使用

1.导入jar包

asm-3.3.1.jar
cglib-2.2.2.jar
commons-logging-1.1.1.jar
log4j-1.2.16.jar
mybatis-3.1.1.jar
mysql-connector-java-5.1.10-bin.jar
slf4j-api-1.6.2.jar
slf4j-log4j12-1.6.2.jar

 

2.创建一个总的配置文件

 1 <?xml version="1.0" encoding="UTF-8" ?>

 2 <!DOCTYPE configuration

 3 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"

 4 "http://mybatis.org/dtd/mybatis-3-config.dtd">

 5 <configuration>

 6     <typeAliases>

 7         <!--给实体类起一个别名 user -->

 8         <typeAlias type="com.kite.mybatis.domain.User" alias="User" />

 9     </typeAliases>

10     <!-- 配置数据源 -->

11     <environments default="development">

12         <environment id="development">

13             <transactionManager type="jdbc" />

14             <dataSource type="POOLED">

15                 <property name="driver" value="com.mysql.jdbc.Driver" />

16                 <property name="url" value="jdbc:mysql://localhost:3306/mybatis" />

17                 <property name="username" value="root" />

18                 <property name="password" value="aaa123456" />

19             </dataSource>

20         </environment>

21     </environments>

22     <!-- 映射文件也是dao的实现类 -->

23     <mappers>

24         <mapper resource="com/kite/mybatis/domain/UserMapper.xml" />

25     </mappers>

26 </configuration>

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3.创建实体类

 1 package com.kite.mybatis.domain;

 2 

 3 public class User

 4 {

 5     private String id;

 6     private String name;

 7     private String age;

 8     public String getId()

 9     {

10         return id;

11     }

12     public void setId(String id)

13     {

14         this.id = id;

15     }

16     public String getName()

17     {

18         return name;

19     }

20     public void setName(String name)

21     {

22         this.name = name;

23     }

24     public String getAge()

25     {

26         return age;

27     }

28     public void setAge(String age)

29     {

30         this.age = age;

31     }

32     

33 }

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4.创建dao类  

 1 package com.kite.mybatis.dao;

 2 

 3 import java.util.List;

 4 

 5 import com.kite.mybatis.domain.User;

 6 

 7 public interface UserMapper

 8 {

 9     public List<User> selectAll();

10 }

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5.创建user的映射文件  因为要作为userMapper的实现所以在 文件的头部<mapper namespace="com.kite.mybatis.dao.UserMapper"> 必需与dao类对应

1 <?xml version="1.0" encoding="UTF-8" ?>

2 <!DOCTYPE mapper

3 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

4 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

5 <mapper namespace="com.kite.mybatis.dao.UserMapper">

6     <select id="selectAll"  resultType="user">

7         select * from user

8     </select>

9 </mapper>

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6.测试

 1 package com.kite.mybatis.test;

 2 

 3 import java.io.IOException;

 4 import java.util.List;

 5 

 6 import org.apache.ibatis.io.Resources;

 7 import org.apache.ibatis.session.SqlSession;

 8 import org.apache.ibatis.session.SqlSessionFactory;

 9 import org.apache.ibatis.session.SqlSessionFactoryBuilder;

10 

11 import com.kite.mybatis.dao.UserMapper;

12 import com.kite.mybatis.domain.User;

13 

14 public class MyBatisTest

15 {

16     public static void main(String[] args) throws IOException

17     {

18         //记载mybatis的配置文件

19         SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader("configuraction.xml"));

20         //创建打开sesison

21         SqlSession session =  factory.openSession();

22         UserMapper userDao = session.getMapper(UserMapper.class);

23         List<User> userList = userDao.selectAll();

24 

25         System.out.println(userList.size());

26     }

27 }

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一个mybatis的简单测试