Java持久层框架MyBatis简单实例

<?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> 
<typeAliases> 
<typeAlias alias="User" type="com.mybatis.User"></typeAlias> 
</typeAliases> 
<environments default="development"> 
<environment id="development"> 
<transactionManager type="JDBC"></transactionManager> 
<dataSource type="POOLED"> 
<property name="driver" value="com.mysql.jdbc.Driver" /> 
<property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8" /> 
<property name="username" value="root" /> 
<property name="password" value="123456" /> 
</dataSource> 
</environment> 
</environments> 
<mappers> 
<mapper resource="user.xml"/> 
</mappers> 
</configuration>

<?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="User"> 
<select id="selectUser" parameterType="int" resultType="User"> 
SELECT * FROM user WHERE id = #{id} 
</select> 
<select id="selectUsers" resultType="User"> 
SELECT * FROM user 
</select> 
</mapper>

package com.mybatis; 
public class User { 
private int id; 
private String name; 
private String password; 
public User(){} 
public User(int id, String name) { 
this.id = id; 
this.name = name; 
} 
public int getId() { 
return this.id; 
} 
public void setId(int id) { 
this.id = id; 
} 
public String getName() { 
return this.name; 
} 
public void setName(String name) { 
this.name = name; 
} 
public String getPassword() { 
return this.password; 
} 
public void setPassword(String password) { 
this.password = password; 
} 
@Override 
public String toString() { 
return "User [id=" + this.id + ", name=" + this.name + ", password=" + this.password + "]"; 
} 
}

package com.mybatis; 
import java.io.IOException; 
import java.io.Reader; 
import java.util.List; 
import org.apache.ibatis.io.Resources; 
import org.apache.ibatis.session.SqlSession; 
import org.apache.ibatis.session.SqlSessionFactory; 
import org.apache.ibatis.session.SqlSessionFactoryBuilder; 
public class Test { 
public static void main(String[] args) throws IOException { 
String resource = "configuration.xml"; 
Reader reader = Resources.getResourceAsReader(resource); 
SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader); 
SqlSession session = ssf.openSession(); 
try{ 
User user = session.selectOne("selectUser", "1"); 
System.out.println(user.getName()); 
System.out.println(user); 
System.out.println("--------------分隔线---------------"); 
List<User> users = session.selectList("selectUsers"); 
for(int i=0; i<users.size(); i++) { 
System.out.println(users.get(i).getName()); 
} 
} catch (Exception e) { 
e.printStackTrace(); 
} finally { 
session.close(); 
} 
} 
}