四、实现一对一 - 王朝网络宽屏版

一、创建数据库表1.1、创建数据表同时插入数据

/*SQLyog EnterPRise v12.09 (64 bit)MySQL- 5.6.27-log : Database - mybatis

**********************************************************************//*!40101 SET NAMES utf8*/;/*!40101 SET SQL_MODE=''*/;/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0*/;/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0*/;/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO'*/;/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0*/;CREATEDATABASE/*!32312 IF NOT EXISTS*/`mybatis`/*!40100 DEFAULT CHARACTER SET utf8*/;USE`mybatis`;/*Table structure for table `author`*/DROPTABLEIFEXISTS`author`;CREATETABLE`author` (

`author_id`int(11) unsignedNOTNULLAUTO_INCREMENT COMMENT'作者ID主键',

`author_username`varchar(30)NOTNULLCOMMENT'作者用户名',

`author_passWord`varchar(32)NOTNULLCOMMENT'作者密码',

`author_email`varchar(50)NOTNULLCOMMENT'作者邮箱',

`author_bio`varchar(1000)DEFAULT'这家伙很赖，什么也没留下'COMMENT'作者简介',

`register_time`datetimeDEFAULTCURRENT_TIMESTAMPCOMMENT'注册时间',PRIMARYKEY(`author_id`)

) ENGINE=InnoDB AUTO_INCREMENT=6DEFAULTCHARSET=utf8;/*Data for the table `author`*/

insert into `author`(`author_id`,`author_username`,`author_password`,`author_email`,`author_bio`,`register_time`) values (1,'张三','123456','123@QQ.com','张三是个新手，刚开始注册','2015-10-29 10:23:59'),(2,'李四','123asf','lisi@163.com','魂牵梦萦 ','2015-10-29 10:24:29'),(3,'王五','dfsd342','ww@sina.com','康熙王朝','2015-10-29 10:25:23'),(4,'赵六','123098sdfa','zhaoliu@qq.com','花午骨','2015-10-29 10:26:09'),(5,'钱七','zxasqw','qianqi@qq.com','这家伙很赖，什么也没留下','2015-10-29 10:27:04'),(6,'张三丰','123456','zhangsf@qq.com','这家伙很赖，什么也没留下','2015-10-29 11:48:00'),(7,'张无忌','qwertyuiop','wuji@163.com','这家伙很赖，什么也没留下','2015-10-29 11:48:24');

/*Table structure for table `blog`*/DROPTABLEIFEXISTS`blog`;CREATETABLE`blog` (

`blog_id`int(11) unsignedNOTNULLAUTO_INCREMENT COMMENT'BlogId主键',

`blog_title`varchar(255)NOTNULLCOMMENT'blog标题',

`author_id`int(11) unsignedNOTNULLCOMMENT'作者ID外键',PRIMARYKEY(`blog_id`),KEY`fk_author_id` (`author_id`),CONSTRAINT`fk_author_id`FOREIGNKEY(`author_id`)REFERENCES`author` (`author_id`)

) ENGINE=InnoDB AUTO_INCREMENT=6DEFAULTCHARSET=utf8;/*Data for the table `blog`*/insertinto`blog`(`blog_id`,`blog_title`,`author_id`)values(1,'小张的Blog',1),(2,'小李',2),(3,'王五不是人',3),(4,'赵地人',4),(5,'钱钱钱',5);/*Table structure for table `posts`*/DROPTABLEIFEXISTS`posts`;CREATETABLE`posts` (

`post_id`int(11) unsignedNOTNULLAUTO_INCREMENT COMMENT'文章主键ID',

`post_subject`varchar(255)NOTNULLCOMMENT'文章主题，标题',

`post_body`textNOTNULLCOMMENT'文章内容最大3000个字符',

`blog_id`int(11) unsignedNOTNULLCOMMENT'Blog主键做外键',

`createtime`datetimeDEFAULTCURRENT_TIMESTAMPCOMMENT'文章创建时间',PRIMARYKEY(`post_id`),KEY`fk_blog_id` (`blog_id`),CONSTRAINT`fk_blog_id`FOREIGNKEY(`blog_id`)REFERENCES`blog` (`blog_id`)

) ENGINE=InnoDB AUTO_INCREMENT=8DEFAULTCHARSET=utf8mb4;/*Data for the table `posts`*/insertinto`posts`(`post_id`,`post_subject`,`post_body`,`blog_id`,`createtime`)values(1,'Mybatis入门一','什么是 MyBatis ？\r\nMyBatis 是支持定制化 SQL、存储过程以及高级映射的优秀的持久层框架。MyBatis 避免了几乎所有的 JDBC 代码和手动设置参数以及获取结果集。MyBatis 可以对配置和原生Map使用简单的xml或注解，将接口和java的 POJOs(Plain Old Java Objects,普通的 Java对象)映射成数据库中的记录。',1,'2015-10-29 10:32:21'),(2,'Mybatis入门二','要使用 MyBatis，只需将 mybatis-x.x.x.jar 文件置于 classpath 中即可。',1,'2015-10-29 10:32:52'),(3,'Oracle学习','Oracle Database，又名Oracle RDBMS，或简称Oracle。是甲骨文公司的一款关系数据库管理系统',2,'2015-10-29 10:33:26'),(4,'JAVA学习一','Java是由Sun Microsystems公司于1995年5月推出的Java面向对象程序设计语言和Java平台的总称',3,'2015-10-29 10:34:17'),(5,'PL/SQL','PL/SQL也是一种程序语言，叫做过程化SQL语言（Procedural Language/SQL）。PL/SQL是Oracle数据库对SQL语句的扩展',4,'2015-10-29 10:37:52'),(6,'CSS标签选择器','标签选择器\r\nID选择器\r\n类选择器\r\n特殊选择器',5,'2015-10-29 10:39:44'),(7,'javascript','js:是前端脚本语言',2,'2015-10-29 10:40:18');/*!40101 SET SQL_MODE=@OLD_SQL_MODE*/;/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS*/;/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS*/;/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES*/;

二、创建项目2.1、创建项目并加入jar包

2.2、创建实体类以author为例

packagecom.pb.mybatis.po;importjava.util.Date;/***

* @Title: Author.java

* @Package com.pb.mybatis.po

* @ClassName Author

* @Description: TODO(Blog作者类)

*@author刘楠

* @date 2015-10-29 上午9:27:53

*@versionV1.0*/publicclassAuthor {//作者IDprivateintauthorId;//作者用户名privateString authorUserName;//作者密码privateString authorPassword;//作者邮箱privateString authorEmail;//作者介绍privateintauthorBio;//注册时间privateDate registerTime;/***@returnthe authorId*/publicintgetAuthorId() {returnauthorId;

}/***@paramauthorId the authorId to set*/publicvoidsetAuthorId(intauthorId) {this.authorId =authorId;

}/***@returnthe authorUserName*/publicString getAuthorUserName() {returnauthorUserName;

}/***@paramauthorUserName the authorUserName to set*/publicvoidsetAuthorUserName(String authorUserName) {this.authorUserName =authorUserName;

}/***@returnthe authorPassword*/publicString getAuthorPassword() {returnauthorPassword;

}/***@paramauthorPassword the authorPassword to set*/publicvoidsetAuthorPassword(String authorPassword) {this.authorPassword =authorPassword;

}/***@returnthe authorEmail*/publicString getAuthorEmail() {returnauthorEmail;

}/***@paramauthorEmail the authorEmail to set*/publicvoidsetAuthorEmail(String authorEmail) {this.authorEmail =authorEmail;

}/***@returnthe authorBio*/publicintgetAuthorBio() {returnauthorBio;

}/***@paramauthorBio the authorBio to set*/publicvoidsetAuthorBio(intauthorBio) {this.authorBio =authorBio;

}/***@returnthe registerTime*/publicDate getRegisterTime() {returnregisterTime;

}/***@paramregisterTime the registerTime to set*/publicvoidsetRegisterTime(Date registerTime) {this.registerTime =registerTime;

}/**(non Javadoc)

* <p>Title: toString</p>

* <p>Description:重写toString方法 </p>

*@return*@seejava.lang.Object#toString()*/@OverridepublicString toString() {return"Author [authorId=" + authorId + ", authorUserName="

+ authorUserName + ", authorPassword=" +authorPassword+ ", authorEmail=" + authorEmail + ", authorBio=" +authorBio+ ", registerTime=" + registerTime + "]";

}

2.3、创建mybatis配置文件

<?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><propertiesresource="db.properties"/><typeAliases><packagename="com.pb.mybatis.po"/></typeAliases><environmentsdefault="development"><environmentid="development"><transactionManagertype="JDBC"/><dataSourcetype="POOLED"><propertyname="driver"value="${jdbc.driver}"/><propertyname="url"value="${jdbc.url}"/><propertyname="username"value="${jdbc.username}"/><propertyname="password"value="${jdbc.password}"/></dataSource></environment></environments><mappers><packagename="com.pb.mybatis.mapper"/></mappers></configuration>

2.4、创建实体类对象的接口以author为例

/***/packagecom.pb.mybatis.mapper;importjava.util.List;importcom.pb.mybatis.po.Author;/*** @Title: AuthorMapper.java

* @Package com.pb.mybatis.mapper

* @ClassName AuthorMapper

* @Description: TODO(作者接口)

*@author刘楠

* @date 2015-10-29 上午11:13:10

*@versionV1.0*/publicinterfaceAuthorMapper {/***

* @Title: findById

* @Description: TODO(根据查找一个用户)

*@paramid

*@returnAuthor*/publicAuthor findAuthorById(intauthorId);/***

* @Title: findByName

* @Description: TODO(根据用户名，模糊查询)

*@paramname

*@returnList<Author>*/publicList<Author>findAuthorByName(String name);/***

* @Title: addAuthor

* @Description: TODO(添加作者)

*@paramauthor

*@returnint*/publicintaddAuthor(Author author);/***

* @Title: updateAuthor

* @Description: TODO(修改用户)

*@paramauthro

*@returnint*/publicintupdateAuthor(Author authro);/***

* @Title: deleteAturho

* @Description: TODO(根据ID删除作者)

*@paramid

*@returnint*/publicintdeleteAuthor(intauthorId);

}

2.5、创建接口对应的mapper.xm以author为例

<?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"><mappernamespace="com.pb.mybatis.mapper.AuthorMapper"><resultMaptype="Author"id="authorResultMap"><idproperty="authorId"column="author_id"/><resultproperty="authorUserName"column="author_username"/><resultproperty="authorPassword"column="author_password"/><resultproperty="authorEmail"column="author_email"/><resultproperty="authorBio"column="author_bio"/><resultproperty="registerTime"column="register_time"/></resultMap><selectid="findAuthorById"parameterType="int"resultMap="authorResultMap">SELECT * FROM author

WHERE author_id=#{authorId}</select><selectid="findAuthorByName"parameterType="String"resultMap="authorResultMap">SELECT * FROM author

WHERE author_username LIKE "%"#{name}"%"</select><!--添加用户

useGeneratedKeys="true" 使用数据库自增序列

keyProperty="authorId"将主键返回

#号中写PO类中的属性--><insertid="addAuthor"parameterType="Author"useGeneratedKeys="true"keyProperty="authorId">INSERT INTO author(author_username,author_password,author_email,author_bio,register_time)

VALUES(#{authorUserName},#{authorPassword},#{authorEmail},#{authorBio},#{registerTime})</insert><updateid="updateAuthor"parameterType="Author">update author

set

author_username=#{authorUserName},

author_password=#{authorPassword},

author_email=#{authorEmail},

author_bio=#{authorBio},

register_time=#{registerTime}

where author_id=#{authorId}</update><deleteid="deleteAuthor"parameterType="int">delete from author

where author_id=#{authorId}</delete></mapper>

三、简单实现增删改查

3.1、测试类以author为例

/***/packagecom.pb.mybatis.mapper;importjava.io.InputStream;importjava.util.Date;importjava.util.List;importorg.apache.ibatis.io.Resources;importorg.apache.ibatis.session.SqlSession;importorg.apache.ibatis.session.SqlSessionFactory;importorg.apache.ibatis.session.SqlSessionFactoryBuilder;importorg.junit.Before;importorg.junit.Test;importcom.pb.mybatis.po.Author;/*** @Title: AuthorMapperTest.java

* @Package com.pb.mybatis.mapper

* @ClassName AuthorMapperTest

* @Description: TODO(测试)

*@author刘楠

* @date 2015-10-29 上午11:57:21

*@versionV1.0*/publicclassAuthorMapperTest {privateSqlSessionFactory sqlSessionFactory;/***

* @Title: setUp

* @Description: TODO(在每个方法前执行的方法)

*@throwsException void*/@BeforepublicvoidsetUp()throwsException {

String resource="configuration.xml";

InputStream in=Resources.getResourceAsStream(resource);//获取会话工厂sqlSessionFactory=newSqlSessionFactoryBuilder().build(in);

}/***

* @Title: testFindAuthorById

* @Description: TODO(根据查找一个用户)

void*/@TestpublicvoidtestFindAuthorById() {//获取会话SqlSession sqlSession=sqlSessionFactory.openSession();//Mapper接口AuthorMapper authorMapper=sqlSession.getMapper(AuthorMapper.class);//调用方法Author author=authorMapper.findAuthorById(2);

System.out.println(author);//关闭会话sqlSession.close();

}/***

* @Title: testFindAuthorByName

* @Description: TODO(根据用户名，模糊查询)

void*/@TestpublicvoidtestFindAuthorByName() {//获取会话SqlSession sqlSession=sqlSessionFactory.openSession();//Mapper接口AuthorMapper authorMapper=sqlSession.getMapper(AuthorMapper.class);//调用方法List<Author> authors=authorMapper.findAuthorByName("张");

System.out.println(authors);//关闭会话sqlSession.close();for(Author a:authors){

System.out.println(a.toString());

}

}/***

* @Title: testAddAuthor

* @Description: TODO(添加作者)

void*/@TestpublicvoidtestAddAuthor() {//获取会话SqlSession sqlSession=sqlSessionFactory.openSession();//Mapper接口AuthorMapper authorMapper=sqlSession.getMapper(AuthorMapper.class);//调用方法Author author=newAuthor();

author.setAuthorUserName("不知道");

author.setAuthorPassword("1234567890");

author.setAuthorEmail("123456@qq.com");

author.setAuthorBio("知道是个什么");

author.setRegisterTime(newDate());intnum=authorMapper.addAuthor(author);

System.out.println("num="+num);

System.out.println("authorId="+author.getAuthorId());

sqlSession.commit();//关闭会话sqlSession.close();

}/***

* @Title: testUpdateAuthor

* @Description: TODO(修改用户)

void*/@TestpublicvoidtestUpdateAuthor() {//获取会话SqlSession sqlSession=sqlSessionFactory.openSession();//Mapper接口AuthorMapper authorMapper=sqlSession.getMapper(AuthorMapper.class);//调用方法Author author=authorMapper.findAuthorById(8);

author.setAuthorUserName("知道了");

author.setAuthorPassword("456789");

author.setAuthorEmail("456789@qq.com");

author.setAuthorBio("哈哈哈哈哈雅虎");

author.setRegisterTime(newDate());intnum=authorMapper.updateAuthor(author);

System.out.println("num="+num);

System.out.println("authorId="+author.getAuthorId());

sqlSession.commit();//关闭会话sqlSession.close();

}/***

* @Title: testDeleteAuthor

* @Description: TODO(根据ID删除作者)

void*/@TestpublicvoidtestDeleteAuthor() {//获取会话SqlSession sqlSession=sqlSessionFactory.openSession();//Mapper接口AuthorMapper authorMapper=sqlSession.getMapper(AuthorMapper.class);//调用方法intnum=authorMapper.deleteAuthor(10);

System.out.println("num="+num);

sqlSession.commit();//关闭会话sqlSession.close();

}

四、实现一对一4.1、建立Blog类

packagecom.pb.mybatis.po;/*** @Title: Blog.java

* @Package com.pb.mybatis.po

* @ClassName Blog

* @Description: TODO(博客)

*@author刘楠

* @date 2015-10-29 上午9:32:56

*@versionV1.0*/publicclassBlog {//博客IDprivateintblogId;//标题privateString blogTitle;//博客作者privateAuthor author;/***@returnthe blogId*/publicintgetBlogId() {returnblogId;

}/***@paramblogId the blogId to set*/publicvoidsetBlogId(intblogId) {this.blogId =blogId;

}/***@returnthe blogTitle*/publicString getBlogTitle() {returnblogTitle;

}/***@paramblogTitle the blogTitle to set*/publicvoidsetBlogTitle(String blogTitle) {this.blogTitle =blogTitle;

}/***@returnthe author*/publicAuthor getAuthor() {returnauthor;

}/***@paramauthor the author to set*/publicvoidsetAuthor(Author author) {this.author =author;

}/**(non Javadoc)

* <p>Title: toString</p>

* <p>Description: 重写toString方法</p>

*@return*@seejava.lang.Object#toString()*/@OverridepublicString toString() {return"Blog [blogId=" + blogId + ", blogTitle=" +blogTitle+ ", author=" + author + "]";

}

4.2、建立BlogMapper接口

/***/packagecom.pb.mybatis.mapper;importjava.util.List;importcom.pb.mybatis.po.Author;importcom.pb.mybatis.po.Blog;/*** @Title: BlogMapper.java

* @Package com.pb.mybatis.mapper

* @ClassName BlogMapper

* @Description: TODO(用一句话描述该文件做什么)

*@author刘楠

* @date 2015-10-29 上午11:13:21

*@versionV1.0*/publicinterfaceBlogMapper {/***

* @Title: findBlogById

* @Description: TODO(根据ID查找BLOG)

*@paramid

*@returnBlog*/publicBlog findBlogById(intid);/***

* @Title: findByName

* @Description: TODO(根据博客名查找)

*@paramname

*@returnList<Blog>*/publicList<Blog>findBlogByName(String blogTitle);/***

* @Title: addBlog

* @Description: TODO(添加博客)

*@paramblog

*@returnint*/publicintaddBlog(Blog blog);/***

* @Title: updateBlog

* @Description: TODO(修改博客)

*@paramblog

*@returnint*/publicintupdateBlog(Blog blog);/***

* @Title: deleteBlog

* @Description: TODO(删除博客)

*@paramid

*@returnint*/publicintdeleteBlog(intid);

}

4.3、建立mapper.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"><mappernamespace="com.pb.mybatis.mapper.BlogMapper"><resultMaptype="Blog"id="blogResultMap"><idproperty="blogId"column="blog_id"/><resultproperty="blogTitle"column="blog_title"/><associationproperty="author"resultMap="authorResultMap"/><!--第二种

把作者类再映射在一个resultMap中

普通属性与表中的字段对应

</association>--></resultMap><resultMaptype="Author"id="authorResultMap"><idproperty="authorId"column="author_id"/><resultproperty="authorUserName"column="author_username"/><resultproperty="authorPassword"column="author_password"/><resultproperty="authorEmail"column="author_email"/><resultproperty="authorBio"column="author_bio"/><resultproperty="registerTime"column="register_time"/></resultMap><selectid="findBlogById"parameterType="int"resultMap="blogResultMap">SELECT blog.blog_id,blog.blog_title,author.author_id,author.author_username,author.author_password,author.author_email,author.author_bio,author.register_time

FROM blog,author

WHERE blog.author_id=author.author_id

AND blog.blog_id=#{blogId}</select><selectid="findBlogByName"parameterType="String"resultMap="blogResultMap">SELECT blog.blog_id,blog.blog_title,author.author_id,author.author_username,author.author_password,author.author_email,author.author_bio,author.register_time

FROM blog,author

WHERE blog.author_id=author.author_id

AND blog_title LIKE "%"#{blogTitle}"%"</select><insertid="addBlog"parameterType="Blog"useGeneratedKeys="true"keyProperty="blogId">INSERT INTO blog(blog_title,author_id)

VALUES(#{blogTitle},#{author.authorId})</insert><updateid="updateBlog"parameterType="Blog">UPDATE blog

SET blog_title=#{blogTitle},

author_id=#{author.authorId}

WHERE blog_id=#{blogId}</update><deleteid="deleteBlog"parameterType="int">delete from blog where blog_id=#{blogId}</delete></mapper>

4.1、测试类

packagecom.pb.mybatis.mapper;importstaticorg.junit.Assert.*;importjava.io.InputStream;importjava.util.List;importorg.apache.ibatis.io.Resources;importorg.apache.ibatis.session.SqlSession;importorg.apache.ibatis.session.SqlSessionFactory;importorg.apache.ibatis.session.SqlSessionFactoryBuilder;importorg.junit.Before;importorg.junit.Test;importcom.pb.mybatis.po.Author;importcom.pb.mybatis.po.Blog;/*** @Title: BlogMapperTest.java

* @Package com.pb.mybatis.mapper

* @ClassName BlogMapperTest

* @Description: TODO(用一句话描述该文件做什么)

*@author刘楠

* @date 2015-10-29 下午3:12:52

*@versionV1.0*/publicclassBlogMapperTest {privateSqlSessionFactory sqlSessionFactory;

@BeforepublicvoidsetUp()throwsException {

String resource="configuration.xml";

InputStream in=Resources.getResourceAsStream(resource);//获取会话工厂sqlSessionFactory=newSqlSessionFactoryBuilder().build(in);

}/*** Test method for {@linkcom.pb.mybatis.mapper.BlogMapper#findBlogById(int)}.*/@TestpublicvoidtestFindBlogById() {//获取会话SqlSession sqlSession=sqlSessionFactory.openSession();//Mapper接口BlogMapper blogMapper=sqlSession.getMapper(BlogMapper.class);//调用方法Blog blog=blogMapper.findBlogById(2);

System.out.println(blog);//关闭会话sqlSession.close();

}/*** Test method for {@linkcom.pb.mybatis.mapper.BlogMapper#findBlogByName(java.lang.String)}.*/@TestpublicvoidtestFindBlogByName() {//获取会话SqlSession sqlSession=sqlSessionFactory.openSession();//Mapper接口BlogMapper blogMapper=sqlSession.getMapper(BlogMapper.class);//调用方法List<Blog> blogs=blogMapper.findBlogByName("小");

System.out.println(blogs);//关闭会话sqlSession.close();

}/*** Test method for {@linkcom.pb.mybatis.mapper.BlogMapper#addBlog(com.pb.mybatis.po.Blog)}.*/@TestpublicvoidtestAddBlog() {//获取会话SqlSession sqlSession=sqlSessionFactory.openSession();//Mapper接口BlogMapper blogMapper=sqlSession.getMapper(BlogMapper.class);

Blog blog=newBlog();

blog.setBlogTitle("倚天屠龙记");

AuthorMapper authorMapper=sqlSession.getMapper(AuthorMapper.class);//调用方法Author author=authorMapper.findAuthorById(2);

blog.setAuthor(author);intnum=blogMapper.addBlog(blog);

System.out.println("num="+num);

System.out.println(blog.getBlogId());

sqlSession.commit();

sqlSession.close();

}/*** Test method for {@linkcom.pb.mybatis.mapper.BlogMapper#updateBlog(com.pb.mybatis.po.Blog)}.*/@TestpublicvoidtestUpdateBlog() {//获取会话SqlSession sqlSession=sqlSessionFactory.openSession();//Mapper接口BlogMapper blogMapper=sqlSession.getMapper(BlogMapper.class);//调用方法Blog blog=blogMapper.findBlogById(8);

blog.setBlogTitle("笑傲江湖");

Author author=blog.getAuthor();

author.setAuthorUserName("金庸");

AuthorMapper authorMapper=sqlSession.getMapper(AuthorMapper.class);intauthorNum=authorMapper.updateAuthor(author);intnum=blogMapper.updateBlog(blog);

System.out.println("authorNum="+authorNum);

System.out.println("num="+num);

sqlSession.commit();//关闭会话sqlSession.close();

}/*** Test method for {@linkcom.pb.mybatis.mapper.BlogMapper#deleteBlog(int)}.*/@TestpublicvoidtestDeleteBlog() {//获取会话SqlSession sqlSession=sqlSessionFactory.openSession();//Mapper接口BlogMapper blogMapper=sqlSession.getMapper(BlogMapper.class);intnum=blogMapper.deleteBlog(11);

System.out.println("num="+num);

sqlSession.commit();

sqlSession.close();

}

五、一对多

5.1、建立Posts类

packagecom.pb.mybatis.po;importjava.util.Date;/*** @Title: Posts.java

* @Package com.pb.mybatis.po

* @ClassName Posts

* @Description: TODO(Blog文章)

*@author刘楠

* @date 2015-10-29 上午9:31:22

*@versionV1.0*/publicclassPosts {//文章IDprivateintpostId;//文件主题privateString postSubject;//主体内容privateString postBody;//文章建立时间privateDate createTime;/***@returnthe postId*/publicintgetPostId() {returnpostId;

}/***@parampostId the postId to set*/publicvoidsetPostId(intpostId) {this.postId =postId;

}/***@returnthe postSubject*/publicString getPostSubject() {returnpostSubject;

}/***@parampostSubject the postSubject to set*/publicvoidsetPostSubject(String postSubject) {this.postSubject =postSubject;

}/***@returnthe postBody*/publicString getPostBody() {returnpostBody;

}/***@parampostBody the postBody to set*/publicvoidsetPostBody(String postBody) {this.postBody =postBody;

}/***@returnthe createTime*/publicDate getCreateTime() {returncreateTime;

}/***@paramcreateTime the createTime to set*/publicvoidsetCreateTime(Date createTime) {this.createTime =createTime;

}/**(non Javadoc)

* <p>Title: toString</p>

* <p>Description:重写toString方法</p>

*@return*@seejava.lang.Object#toString()*/@OverridepublicString toString() {return"Posts [postId=" + postId + ", postSubject=" +postSubject+ ", postBody=" + postBody +", createTime="

+ createTime + "]";

}

5.2、在blog类中添加List

packagecom.pb.mybatis.po;importjava.util.List;/*** @Title: Blog.java

* @Package com.pb.mybatis.po

* @ClassName Blog

* @Description: TODO(博客)

*@author刘楠

* @date 2015-10-29 上午9:32:56

*@versionV1.0*/publicclassBlog {//博客IDprivateintblogId;//标题privateString blogTitle;//博客作者privateAuthor author;//文章ListprivateList<Posts>posts;/***@returnthe blogId*/publicintgetBlogId() {returnblogId;

}/***@paramblogId the blogId to set*/publicvoidsetBlogId(intblogId) {this.blogId =blogId;

}/***@returnthe blogTitle*/publicString getBlogTitle() {returnblogTitle;

}/***@paramblogTitle the blogTitle to set*/publicvoidsetBlogTitle(String blogTitle) {this.blogTitle =blogTitle;

}/***@returnthe author*/publicAuthor getAuthor() {returnauthor;

}/***@paramauthor the author to set*/publicvoidsetAuthor(Author author) {this.author =author;

}/***@returnthe posts*/publicList<Posts>getPosts() {returnposts;

}/***@paramposts the posts to set*/publicvoidsetPosts(List<Posts>posts) {this.posts =posts;

}/**(non Javadoc)

* <p>Title: toString</p>

* <p>Description: </p>

*@return*@seejava.lang.Object#toString()*/@OverridepublicString toString() {return"Blog [blogId=" + blogId + ", blogTitle=" +blogTitle+ ", author=" + author + ", posts=" + posts + "]";

}

5.3、修改blogMapper.xml

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

PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

把作者类再映射在一个resultMap中

普通属性与表中的字段对应

</association>--></resultMap><resultMaptype="Posts"id="postsResultMap"><idproperty="postId"column="post_id"/><resultproperty="postSubject"column="post_subject"/><resultproperty="postBody"column="post_body"/><resultproperty="createTime"column="createtime"/></resultMap><resultMaptype="Author"id="authorResultMap"><idproperty="authorId"column="author_id"/><resultproperty="authorUserName"column="author_username"/><resultproperty="authorPassword"column="author_password"/><resultproperty="authorEmail"column="author_email"/><resultproperty="authorBio"column="author_bio"/><resultproperty="registerTime"column="register_time"/></resultMap><selectid="findBlogById"parameterType="int"resultMap="blogResultMap">SELECT blog.blog_id,blog.blog_title,

author.author_id,author.author_username,author.author_password,author.author_email,author.author_bio,author.register_time,

posts.post_id,posts.post_subject,posts.post_body,posts.createtime,posts.blog_id

FROM blog,author,posts

WHERE blog.author_id=author.author_id

AND blog.blog_id=posts.blog_id

FROM blog,author

WHERE blog.author_id=author.author_id

AND blog_title LIKE "%"#{blogTitle}"%"</select><insertid="addBlog"parameterType="Blog"useGeneratedKeys="true"keyProperty="blogId">INSERT INTO blog(blog_title,author_id)

VALUES(#{blogTitle},#{author.authorId})</insert><updateid="updateBlog"parameterType="Blog">UPDATE blog

SET blog_title=#{blogTitle},

author_id=#{author.authorId}

WHERE blog_id=#{blogId}</update><deleteid="deleteBlog"parameterType="int">delete from blog where blog_id=#{blogId}</delete></mapper>

5.4、测试

测试类不变