MyBatis3入门样例

User.java

  
    

   
     package
   
      com.archie.domain;


   
     import
   
      java.io.Serializable;

@SuppressWarnings(
   
     "
   
     serial
   
     "
   
     )

   
     public
   
      
   
     class
   
      User 
   
     implements
   
      Serializable{

 
   
     private
   
      
   
     int
   
      uid;
 
   
     private
   
      String uname;
 
   
     private
   
      String upwd;
 
 
   
     public
   
      
   
     int
   
      getUid() {
 
   
     return
   
      uid;
 }
 
   
     public
   
      
   
     void
   
      setUid(
   
     int
   
      uid) {
 
   
     this
   
     .uid 
   
     =
   
      uid;
 }
 
   
     public
   
      String getUname() {
 
   
     return
   
      uname;
 }
 
   
     public
   
      
   
     void
   
      setUname(String uname) {
 
   
     this
   
     .uname 
   
     =
   
      uname;
 }
 
   
     public
   
      String getUpwd() {
 
   
     return
   
      upwd;
 }
 
   
     public
   
      
   
     void
   
      setUpwd(String upwd) {
 
   
     this
   
     .upwd 
   
     =
   
      upwd;
 }
 @Override
 
   
     public
   
      String toString() {
 
   
     return
   
      
   
     "
   
     User [uid=
   
     "
   
      
   
     +
   
      uid 
   
     +
   
      
   
     "
   
     , uname=
   
     "
   
      
   
     +
   
      uname 
   
     +
   
      
   
     "
   
     , upwd=
   
     "
   
      
   
     +
   
      upwd 
   
     +
   
      
   
     "
   
     ]
   
     "
   
     ;
 }
 
}
  
    

UserMapper.java

  
    

   
      
   
     

   
     package
   
      com.archie.persistence;


   
     import
   
      com.archie.domain.User;


   
     public
   
      
   
     interface
   
      UserMapper {

 User getUserByName(String uname);
}
  
    

UserMapper.xml

  
    

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

   
     <!
   
     DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 
"http://mybatis.org/dtd/mybatis-3-mapper.dtd"
   
     >
   
     


   
     <
   
     mapper 
   
     namespace
   
     ="com.archie.persistence.UserMapper"
   
     >
   
     

 
   
     <
   
     cache 
   
     />
   
     
 
 
   
     <
   
     select 
   
     id
   
     ="getUserByName"
   
      resultType
   
     ="User"
   
      parameterType
   
     ="string"
   
     >
   
     
 select * from t_user
 where uname=#{uname}
 
   
     </
   
     select
   
     >
   
     


   
     </
   
     mapper
   
     >
  
    

mybatis-config.xml

  
    

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

   
     <!
   
     DOCTYPE configuration
 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 "http://mybatis.org/dtd/mybatis-3-config.dtd"
   
     >
   
     


   
     <
   
     configuration
   
     >
   
     
 
   
     <
   
     settings
   
     >
   
     
 
   
     <!--
   
      changes from the defaults 
   
     -->
   
     
 
   
     <
   
     setting 
   
     name
   
     ="lazyLoadingEnabled"
   
      value
   
     ="false"
   
      
   
     />
   
     
 
   
     </
   
     settings
   
     >
   
     

 
   
     <
   
     typeAliases
   
     >
   
     

 
   
     <
   
     typeAlias 
   
     alias
   
     ="User"
   
      type
   
     ="com.archie.domain.User"
   
      
   
     />
   
     

 
   
     </
   
     typeAliases
   
     >
   
     

 
   
     <
   
     environments 
   
     default
   
     ="development"
   
     >
   
     

 
   
     <
   
     environment 
   
     id
   
     ="development"
   
     >
   
     

 
   
     <
   
     transactionManager 
   
     type
   
     ="JDBC"
   
      
   
     />
   
     

 
   
     <
   
     dataSource 
   
     type
   
     ="POOLED"
   
     >
   
     

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

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

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

 
   
     <
   
     property 
   
     name
   
     ="password"
   
      value
   
     ="root"
   
      
   
     />
   
     

 
   
     </
   
     dataSource
   
     >
   
     

 
   
     </
   
     environment
   
     >
   
     

 
   
     </
   
     environments
   
     >
   
     

 
   
     <
   
     mappers
   
     >
   
     

 
   
     <
   
     mapper 
   
     resource
   
     ="com/archie/persistence/UserMapper.xml"
   
      
   
     />
   
     

 
   
     </
   
     mappers
   
     >
   
     


   
     </
   
     configuration
   
     >
  
    

MyBatisTest.java  

  
    

   
      
   
     package
   
      com.archie.test;


   
     import
   
      java.io.IOException;

   
     import
   
      java.io.Reader;


   
     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
   
      com.archie.domain.User;


   
     /**
   
     
 * MyBatis内部测试
 * 
   
     @author
   
      archie2010
 * since 2011-3-2 下午02:34:17
 
   
     */
   
     

   
     public
   
      
   
     class
   
      MyBatisTest {

 
   
     public
   
      
   
     static
   
      
   
     void
   
      main(String[] args) 
   
     throws
   
      IOException {
 
 String resource
   
     =
   
     "
   
     mybatis-config.xml
   
     "
   
     ;
 
 Reader reader 
   
     =
   
      Resources.getResourceAsReader(resource);
 SqlSessionFactory sessionFactory
   
     =
   
     new
   
      SqlSessionFactoryBuilder().build(reader);
 
 SqlSession session
   
     =
   
     sessionFactory.openSession();
 
 User user
   
     =
   
     (User) session.selectOne(
   
     "
   
     com.archie.persistence.UserMapper.getUserByName
   
     "
   
     , 
   
     "
   
     archie
   
     "
   
     );
 
 System.out.println(user.toString());
 
 session.close();
 }
}