mybatis的使用

1.導入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.建立一個總的配置文件

 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         <!--給實體類起一個別名 user -->
 8         <typeAlias type="com.kite.mybatis.domain.User" alias="User" />
 9     </typeAliases>
10     <!-- 配置數據源 -->
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的實現類 -->
23     <mappers>
24         <mapper resource="com/kite/mybatis/domain/UserMapper.xml" />
25     </mappers>
26 </configuration>

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3.建立實體類

 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.建立dao類  

 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.建立user的映射文件  由於要做爲userMapper的實現因此在 文件的頭部<mapper namespace="com.kite.mybatis.dao.UserMapper"> 必需與dao類對應

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.測試

 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         //記載mybatis的配置文件
19         SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader("configuraction.xml")); 20         //建立打開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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一個mybatis的簡單測試