<collection property="posts"  ofType="Post">
            <id property="id" column="post_id"/>
            <result property="subject" column="post_subject"/>
            <result property="body" column="post_body"/>
      </collection>

	private List<Post> posts; 

This time federate blog tables and article tables (a blog_id can correspond to many articles) SQL is as follows:

<resultMap id="blogResult" type="Blog">
	<id property="id" column="blog_id"/>
	<result property="title" column="blog_title"/>
	<collection property="posts" ofType="Post">
		<id property="id" column="post_id"/>
		<result property="subject" column="post_subject"/>
		<result property="body" column="post_body"/>
	</collection>
</resultMap>

Advanced associations and set mappings have a lot to think about.Just let the collection mapping described by the face tidy up a little (there are many articles under a blog).

First create the tables you need and insert some data into them.

package com.mybatis.model;
/**
 * Author class
 * @author Administrator
 *
 */
public class Author {
	
	private int id;
	private String username;
	private String password;
	private String email;
	private String bio; //personal data
	private String favourite_section; //Favourite..
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	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;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public String getBio() {
		return bio;
	}
	public void setBio(String bio) {
		this.bio = bio;
	}
	public String getFavourite_section() {
		return favourite_section;
	}
	public void setFavourite_section(String favouriteSection) {
		favourite_section = favouriteSection;
	}
	
}

package com.mybatis.model;

import java.util.List;

/**
 * Blog Class
 * @author Administrator
 *
 */
public class Blog {
	private int id;
	private String title;
	private Author author;
	private List<Post> posts; //The blog class has many articles corresponding to the blog_id in the post table
	
	public List<Post> getPosts() {
		return posts;
	}
	public void setPosts(List<Post> posts) {
		this.posts = posts;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	public Author getAuthor() {
		return author;
	}
	public void setAuthor(Author author) {
		this.author = author;
	}
	
}

package com.mybatis.model;

import java.util.Date;

/**
 * Article Class
 * @author Administrator
 *
 */
public class Post {
	private int id;
	private int blog_id;
	private int author_id;
	private Date created_on;
	private String section;
	private String subject;
	private String draft;
	private String body;
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public int getBlog_id() {
		return blog_id;
	}
	public void setBlog_id(int blogId) {
		blog_id = blogId;
	}
	public int getAuthor_id() {
		return author_id;
	}
	public void setAuthor_id(int authorId) {
		author_id = authorId;
	}
	public Date getCreated_on() {
		return created_on;
	}
	public void setCreated_on(Date createdOn) {
		created_on = createdOn;
	}
	public String getSection() {
		return section;
	}
	public void setSection(String section) {
		this.section = section;
	}
	public String getSubject() {
		return subject;
	}
	public void setSubject(String subject) {
		this.subject = subject;
	}
	public String getDraft() {
		return draft;
	}
	public void setDraft(String draft) {
		this.draft = draft;
	}
	public String getBody() {
		return body;
	}
	public void setBody(String body) {
		this.body = body;
	}
	
}

<?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>
    <!-- Alias an entity class  -->
	  <typeAlias type="com.mybatis.model.Blog" alias="Blog"/> 
	  <typeAlias type="com.mybatis.model.Post" alias="Post"/>
  </typeAliases>
  
  <!-- Data source configuration, used here MySQL data base -->
  <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="root"/>
		   <property name="password" value="123456"/>
	   </dataSource>
     </environment>
  </environments>
  
  <mappers>
	  <mapper resource="com/mybatis/model/Blog.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="com.mybatis.dao.IBlogDao">

<!-- Map blogs with a collection of article mappings -->
<resultMap id="blogResult" type="Blog">
	<id property="id" column="blog_id"/>
	<result property="title" column="blog_title"/>
	
	<!--Collection of Articles -->
	<collection property="posts" ofType="Post">
		<id property="id" column="post_id"/>
		<result property="subject" column="post_subject"/>
		<result property="body" column="post_body"/>
	</collection>
</resultMap>

<select id="selectBlog" parameterType="int" resultMap="blogResult">
		 select 
			 b.id as blog_id ,
			 b.title as blog_title,
			 b.author_id as blog_author_id,
			 p.id as post_id,
			 p.subject as post_subject,
			 p.body as post_body
		   from blog b
			   left outer join  post p on b.id=p.blog_id
			   where b.id=#{id}  
</select>
</mapper>

DEBUG [com.mybatis.dao.IBlogDao.selectBlog] - ooo Using Connection [com.mysql.jdbc.Connection@e00ed0]
DEBUG [com.mybatis.dao.IBlogDao.selectBlog] - ==>  Preparing: select b.id as blog_id , b.title as blog_title, b.author_id as blog_author_id, p.id as post_id, p.subject as post_subject, p.body as post_body from blog b left outer join post p on b.id=p.blog_id where b.id=? 
DEBUG [com.mybatis.dao.IBlogDao.selectBlog] - ==> Parameters: 1(Integer)
//Ultimate Martial Gods
//Dominant
//Spiritual Fields

This article was adapted from http://blog.csdn.net/yulei_qq/article/details/22057633