myBatis

1、pom.xml

<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
  		<groupId>org.mybatis</groupId>
  		<artifactId>mybatis</artifactId>
  		<version>3.4.6</version>
	</dependency>
	<dependency>
  		 <groupId>mysql</groupId>
  		 <artifactId>mysql-connector-java</artifactId>
         <version>5.1.21</version>
	</dependency>	
  </dependencies>

2、结构图

3、User

public class User {
	private String username;
	private String password;
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}

}

4、User.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.wyj.mybatis.UserMapper">
	<select id="GetUserByID" parameterType="String" resultType="User">
		select * from `user` where username = #{username}
    </select>
</mapper>

5、Configure.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>
	<typeAliases>
		<typeAlias alias="User" type="com.wyj.mybatis.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://127.0.0.1:3306/test" />
			    <property name="username" value="wyj" />
			    <property name="password" value="20131983" />
             </dataSource>
		</environment>
	</environments>

	<mappers>
	     <mapper resource="User.xml" />
	</mappers>
</configuration>

6、主函数

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;

public class App 
{
	private static SqlSessionFactory sqlSessionFactory;
	private static Reader reader;

	static {
		try {
			reader = Resources.getResourceAsReader("Configure.xml");
			sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	public static SqlSessionFactory getSession() {
		return sqlSessionFactory;
	}

	public static void main(String[] args) {
		SqlSession session = sqlSessionFactory.openSession();
		try {
			User user = (User) session.selectOne(
					"com.wyj.mybatis.UserMapper.GetUserByID", "zy");
			if(user!=null){
				String userInfo = "名字："+user.getUsername()+", 所属部门："+user.getPassword();
				System.out.println(userInfo);
			}
		} finally {
			session.close();
		}
	}
}