MyBatis入门（五）---延时加载、缓存

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发布时间：2019-06-09

本文共 27943 字，大约阅读时间需要 93 分钟。

一、创建数据库

1.1、建立数据库

/*SQLyog Enterprise v12.09 (64 bit)MySQL - 5.7.9-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 */;CREATE DATABASE /*!32312 IF NOT EXISTS*/`mybatis` /*!40100 DEFAULT CHARACTER SET utf8 */;USE `mybatis`;/*Table structure for table `author` */DROP TABLE IF EXISTS `author`;CREATE TABLE `author` (  `author_id` int(11) unsigned NOT NULL AUTO_INCREMENT COMMENT '作者ID主键',  `author_username` varchar(30) NOT NULL COMMENT '作者用户名',  `author_password` varchar(32) NOT NULL COMMENT '作者密码',  `author_email` varchar(50) NOT NULL COMMENT '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` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '注册时间',  PRIMARY KEY (`author_id`)) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=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'),(8,'fdsf','ffff','fdsfds',NULL,NULL),(9,'fdsf','ffff','fdsfds',NULL,NULL),(10,'aaaa','bbbb','ddd@qq.com','这家伙很赖，什么也没留下','2015-10-29 22:07:45');/*Table structure for table `blog` */DROP TABLE IF EXISTS `blog`;CREATE TABLE `blog` (  `blog_id` int(11) unsigned NOT NULL AUTO_INCREMENT COMMENT 'BlogId主键',  `blog_title` varchar(255) NOT NULL COMMENT 'blog标题',  `author_id` int(11) unsigned NOT NULL COMMENT '作者ID外键',  PRIMARY KEY (`blog_id`),  KEY `fk_author_id` (`author_id`),  CONSTRAINT `fk_author_id` FOREIGN KEY (`author_id`) REFERENCES `author` (`author_id`)) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;/*Data for the table `blog` */insert  into `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` */DROP TABLE IF EXISTS `posts`;CREATE TABLE `posts` (  `post_id` int(11) unsigned NOT NULL AUTO_INCREMENT COMMENT '文章主键ID',  `post_subject` varchar(255) NOT NULL COMMENT '文章主题，标题',  `post_body` text NOT NULL COMMENT '文章内容最大3000个字符',  `blog_id` int(11) unsigned NOT NULL COMMENT 'Blog主键做外键',  `createtime` datetime DEFAULT CURRENT_TIMESTAMP COMMENT '文章创建时间',  PRIMARY KEY (`post_id`),  KEY `fk_blog_id` (`blog_id`),  CONSTRAINT `fk_blog_id` FOREIGN KEY (`blog_id`) REFERENCES `blog` (`blog_id`)) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8mb4;/*Data for the table `posts` */insert  into `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 */;

数据表和数据

二、创建项目

2.1、创建项目

三、建立实体类与Mapper接口

3.1、3个实体类

package com.pb.mybatis.po;import java.util.Date;/** * * @ClassName: Author* @Description: TODO(作者)* @author 刘楠* @date 2015-10-31 下午12:39:33* */public class Author {    //作者id    private Integer authorId;    //作者姓名    private String authorUserName;    //作者密码    private String authorPassword;    //作者邮箱    private String authorEmail;    //作者介绍    private String authroBio;    //注册时间    private Date registerTime;                public Integer getAuthorId() {        return authorId;    }    public void setAuthorId(Integer authorId) {        this.authorId = authorId;    }    public String getAuthorUserName() {        return authorUserName;    }    public void setAuthorUserName(String authorUserName) {        this.authorUserName = authorUserName;    }    public String getAuthorPassword() {        return authorPassword;    }    public void setAuthorPassword(String authorPassword) {        this.authorPassword = authorPassword;    }    public String getAuthorEmail() {        return authorEmail;    }    public void setAuthorEmail(String authorEmail) {        this.authorEmail = authorEmail;    }    public String getAuthroBio() {        return authroBio;    }    public void setAuthroBio(String authroBio) {        this.authroBio = authroBio;    }    public Date getRegisterTime() {        return registerTime;    }    public void setRegisterTime(Date registerTime) {        this.registerTime = registerTime;    }    @Override    public String toString() {        return "Author [authorId=" + authorId + ", authorUserName="                + authorUserName + ", authorPassword=" + authorPassword                + ", authorEmail=" + authorEmail + ", authroBio=" + authroBio                + ", registerTime=" + registerTime + "]";    }        }

package com.pb.mybatis.po;import java.util.List;public class Blog {        //Blog,ID    private Integer blogId;    //Blog 名称标题    private String blogTitle;    //外键authorId    //作者    private Author author;    //文章 列表    private Integer authorId;        //文章列表    private List
     
       postsList;            public Integer getBlogId() {        return blogId;    }    public void setBlogId(Integer blogId) {        this.blogId = blogId;    }    public String getBlogTitle() {        return blogTitle;    }    public void setBlogTitle(String blogTitle) {        this.blogTitle = blogTitle;    }    public Author getAuthor() {        return author;    }    public void setAuthor(Author author) {        this.author = author;    }    public Integer getAuthorId() {        return authorId;    }    public void setAuthorId(Integer authorId) {        this.authorId = authorId;    }    public List
      
        getPostsList() {        return postsList;    }    public void setPostsList(List
       
         postsList) {        this.postsList = postsList;    }            @Override    public String toString() {        return "Blog [blogId=" + blogId + ", blogTitle=" + blogTitle                +  ", authorId=" + authorId + "]";    }                    }

package com.pb.mybatis.po;import java.util.Date;public class Posts {    //文章ID    private Integer postId;    //文章标题    private String postTitle;    //文章主体内容    private String postBody;        //外键    private Integer blogId;    //建立时间    private Date createTime;            public Integer getPostId() {        return postId;    }    public void setPostId(Integer postId) {        this.postId = postId;    }    public String getPostTitle() {        return postTitle;    }    public void setPostTitle(String postTitle) {        this.postTitle = postTitle;    }    public String getPostBody() {        return postBody;    }    public void setPostBody(String postBody) {        this.postBody = postBody;    }    public Date getCreateTime() {        return createTime;    }    public void setCreateTime(Date createTime) {        this.createTime = createTime;    }            public Integer getBlogId() {        return blogId;    }    public void setBlogId(Integer blogId) {        this.blogId = blogId;    }    @Override    public String toString() {        return "Posts [postId=" + postId + ", postTitle=" + postTitle                + ", postBody=" + postBody + ", createTime=" + createTime                + ", blogId=" + blogId + "]";    }                        }

3.2、3个接口

package com.pb.mybatis.mapper;import com.pb.mybatis.po.Author;public interface AuthorMapper {    /**     *         * @Title: findAuthorById        * @Description: TODO(根据id查找)        * @param @param id    * @param @return    设定文件        * @return Author    返回类型        * @throws     */    public Author findAuthorById(int id);}

package com.pb.mybatis.mapper;import com.pb.mybatis.po.Blog;public interface BlogMapper {        /**     *         * @Title: findBlogById        * @Description: TODO(根据BLOGID查找BLOG，并关联author，与posts实现延时加载)        * @param @param id    * @param @return    设定文件        * @return Blog    返回类型        * @throws     */    public Blog findBlogById(int blogId);}

package com.pb.mybatis.mapper;import java.util.List;import com.pb.mybatis.po.Posts;public interface PostsMapper {    /**     *         * @Title: findPostsByBlogId        * @Description: TODO(根据BLOGID查找文章列表)        * @param @param blogId    * @param @return    设定文件        * @return List
     
          返回类型        * @throws     */    public List
      
        findPostsByBlogId(int blogId);}

四、建立mapper.xml与confinguration.xml

4.1、相对应的mapper.xml

AuthorMapper.xml

BlogMapper.xml

PostsMapper.xml

4.2、configuration.xml

db.properties

driver=com.mysql.jdbc.Driverurl=jdbc:mysql://localhost:3306/mybatis?character=utf8username=rootpassword=root

开启延时加载，同时关闭立即加载

五、测试

5.1、JUNIT

package com.pb.mybatis.mapper;import java.io.InputStream;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;import org.junit.Before;import org.junit.Test;import com.pb.mybatis.po.Blog;import com.pb.mybatis.po.Posts;public class BlogMapperTest {    private SqlSessionFactory sqlSessionFactory;    @Before    public void setUp() throws Exception {        String config="configuration.xml";        InputStream resource=Resources.getResourceAsStream(config);        sqlSessionFactory=new SqlSessionFactoryBuilder().build(resource);    }    /**     *         * @Title: testFindBlogs        * @Description: TODO(延时加载)        * @param     设定文件        * @return void    返回类型        * @throws     */    @Test    public void testFindBlogById() {        //建立会话        SqlSession sqlSession=sqlSessionFactory.openSession();        //获取Mapper接口对象        BlogMapper blogMapper=sqlSession.getMapper(BlogMapper.class);        //调用Mapper方法         Blog blog=blogMapper.findBlogById(1);                System.out.println(blog.getBlogId()+"..."+blog.getBlogTitle());        System.out.println("===========开始延时加载作者Author===========");        System.out.println(blog.getAuthor());        System.out.println("===========开始延时加载文章===========");        List
     
       list=blog.getPostsList();        /*int count=0;        for(Posts p:list){            System.out.println("count+"+count++);            System.out.println(p.getPostId());            System.out.println(p.getPostTitle());            System.out.println(p.getPostBody());            System.out.println(p.getCreateTime());            System.out.println(p.getBlogId());        }*/            }}

结果：

DEBUG [main] - ==>  Preparing: SELECT * FROM blog WHERE blog_id=? DEBUG [main] - ==> Parameters: 1(Integer)DEBUG [main] - <==      Total: 11...小张的Blog===========开始延时加载作者Author===========DEBUG [main] - ==>  Preparing: select * from author where author_id=? DEBUG [main] - ==> Parameters: 1(Integer)DEBUG [main] - <==      Total: 1Author [authorId=1, authorUserName=张三, authorPassword=123456, authorEmail=123@qq.com, authroBio=张三是个新手，刚开始注册, registerTime=Thu Oct 29 10:23:59 CST 2015]===========开始延时加载文章===========DEBUG [main] - ==>  Preparing: select * from posts where blog_id=? DEBUG [main] - ==> Parameters: 1(Integer)DEBUG [main] - <==      Total: 2

六、一级缓存

6.1、mybatis一级缓存

mybatis，默认开启了一级缓存，sqlSession中默认有一个hashMap

当查询时，先去hashMap中查找，

如果有就直接，取出，不再操作数据库

如果没有就去数据库查找，并放在haspMap中

当做事物时，如添加，删除，修改，后有commit时会清空一级缓存

sqlSession是互不影响的，一级缓存

6.2、还是上级的例子

测试:查询用户

package com.pb.mybatis.mapper;import static org.junit.Assert.*;import java.io.InputStream;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 org.junit.Before;import org.junit.Test;import com.pb.mybatis.po.Author;public class AuthorMapperTest {    private SqlSessionFactory sqlSessionFactory;    @Before    public void setUp() throws Exception {        String config="configuration.xml";        InputStream resource=Resources.getResourceAsStream(config);        sqlSessionFactory=new SqlSessionFactoryBuilder().build(resource);    }    @Test    public void testFindAuthorById() {        //获取会话工厂        SqlSession sqlSession=sqlSessionFactory.openSession();        AuthorMapper authorMapper=sqlSession.getMapper(AuthorMapper.class);        //第一次查询        Author author1=authorMapper.findAuthorById(2);        System.out.println(author1);        //再次查询同样的        Author author2=authorMapper.findAuthorById(2);        System.out.println(author2);                //再次查询不的同样的        Author author3=authorMapper.findAuthorById(4);        System.out.println(author3);    }}

结果：

DEBUG [main] - ==>  Preparing: select * from author where author_id=? DEBUG [main] - ==> Parameters: 2(Integer)DEBUG [main] - <==      Total: 1Author [authorId=2, authorUserName=李四, authorPassword=123asf, authorEmail=lisi@163.com, authroBio=魂牵梦萦 , registerTime=Thu Oct 29 10:24:29 CST 2015]Author [authorId=2, authorUserName=李四, authorPassword=123asf, authorEmail=lisi@163.com, authroBio=魂牵梦萦 , registerTime=Thu Oct 29 10:24:29 CST 2015]DEBUG [main] - ==>  Preparing: select * from author where author_id=? DEBUG [main] - ==> Parameters: 4(Integer)DEBUG [main] - <==      Total: 1Author [authorId=4, authorUserName=赵六, authorPassword=123098sdfa, authorEmail=zhaoliu@qq.com, authroBio=花午骨, registerTime=Thu Oct 29 10:26:09 CST 2015]

6.3、当查询后，做事务，再查询第一次的

接口中做添加方法

/**     *         * @Title: addAuthor        * @Description: TODO(添加)        * @param @param author    * @param @return    设定文件        * @return int    返回类型        * @throws     */    public int addAuthor(Author author);

mapper.xml中做同样的select


     
     
      INSERT INTO author(author_username,author_password,author_email,author_bio)VALUES(#{authorUserName},#{authorPassword},#{authorEmail},#{authroBio})

测试

package com.pb.mybatis.mapper;import static org.junit.Assert.*;import java.io.InputStream;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 org.junit.Before;import org.junit.Test;import com.pb.mybatis.po.Author;public class AuthorMapperTest {    private SqlSessionFactory sqlSessionFactory;    @Before    public void setUp() throws Exception {        String config="configuration.xml";        InputStream resource=Resources.getResourceAsStream(config);        sqlSessionFactory=new SqlSessionFactoryBuilder().build(resource);    }    @Test    public void testFindAuthorById() {        //获取会话工厂        SqlSession sqlSession=sqlSessionFactory.openSession();        AuthorMapper authorMapper=sqlSession.getMapper(AuthorMapper.class);        //第一次查询        Author author1=authorMapper.findAuthorById(2);        System.out.println(author1);        System.out.println("=======下面有事务处理========");        Author newAuthor=new Author();        newAuthor.setAuthorEmail("qq.com@qq.com");        newAuthor.setAuthorPassword("fdsfds");        newAuthor.setAuthorUserName("郭靖");        newAuthor.setAuthroBio("射雕英雄传");        int num=authorMapper.addAuthor(newAuthor);        sqlSession.commit();                System.out.println(newAuthor.getAuthorId());        System.out.println("num="+num);        System.out.println("再次查询");        //再次查询同样的        Author author2=authorMapper.findAuthorById(2);        System.out.println(author2);        }    }

结果：

DEBUG [main] - ==>  Preparing: select * from author where author_id=? DEBUG [main] - ==> Parameters: 2(Integer)DEBUG [main] - <==      Total: 1Author [authorId=2, authorUserName=李四, authorPassword=123asf, authorEmail=lisi@163.com, authroBio=魂牵梦萦 , registerTime=Thu Oct 29 10:24:29 CST 2015]=======下面有事务处理========DEBUG [main] - ==>  Preparing: INSERT INTO author(author_username,author_password,author_email,author_bio) VALUES(?,?,?,?) DEBUG [main] - ==> Parameters: 郭靖(String), fdsfds(String), qq.com@qq.com(String), 射雕英雄传(String)DEBUG [main] - <==    Updates: 1DEBUG [main] - Committing JDBC Connection [com.mysql.jdbc.JDBC4Connection@42bb0406]11num=1再次查询DEBUG [main] - ==>  Preparing: select * from author where author_id=? DEBUG [main] - ==> Parameters: 2(Integer)DEBUG [main] - <==      Total: 1Author [authorId=2, authorUserName=李四, authorPassword=123asf, authorEmail=lisi@163.com, authroBio=魂牵梦萦 , registerTime=Thu Oct 29 10:24:29 CST 2015]

七、二级缓存

7.1、mybatis二级缓存与一级缓存

sqlSession是互不影响的，一级缓存

Mapper(namespace)是二级缓存

多个sqlSession可以共享一个Mapper的二级缓存区域

二级缓存按namespace分，其它的mapper也有自己的二级缓存区域namespace

第一个namespace的mapper都有一个二级缓存区域，2个mapper的namespace如果相同，这2个mapper执行sql查询数据将存在相同的二级缓存区域中.

7.2、开启二级缓存

1.二级缓存是mapper范围级别的，除了在configuration.xml设置二级缓存的总开关，还在在个体的mapper.xml中开启二级缓存

2.mapper对就的pojo类，实现序列化

3.在authorMapper中开启二级缓存

7.3、测试

@Test    public void testCache() {        // 获取会话工厂        SqlSession sqlSession1 = sqlSessionFactory.openSession();        AuthorMapper authorMapper1 = sqlSession1.getMapper(AuthorMapper.class);        // 第一次查询        Author author1 = authorMapper1.findAuthorById(2);        //必须关闭不数据无法写到缓存区域        sqlSession1.close();        // 获取会话工厂        /*SqlSession sqlSession2 = sqlSessionFactory.openSession();        AuthorMapper authorMapper2 = sqlSession2.getMapper(AuthorMapper.class);        sqlSession2.close();*/        // 获取会话工厂        SqlSession sqlSession3 = sqlSessionFactory.openSession();        AuthorMapper authorMapper3 = sqlSession3.getMapper(AuthorMapper.class);        // 第一次查询        Author author3 = authorMapper3.findAuthorById(2);        sqlSession3.close();    }

DEBUG [main] - Cache Hit Ratio [com.pb.mybatis.mapper.AuthorMapper]: 0.0DEBUG [main] - Opening JDBC ConnectionDEBUG [main] - Created connection 873769339.DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - ==>  Preparing: select * from author where author_id=? DEBUG [main] - ==> Parameters: 2(Integer)DEBUG [main] - <==      Total: 1DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - Returned connection 873769339 to pool.DEBUG [main] - Cache Hit Ratio [com.pb.mybatis.mapper.AuthorMapper]: 0.5

中间增加commit操作

@Test    public void testCache() {        // 获取会话工厂        SqlSession sqlSession1 = sqlSessionFactory.openSession();        AuthorMapper authorMapper1 = sqlSession1.getMapper(AuthorMapper.class);        // 第一次查询        Author author1 = authorMapper1.findAuthorById(2);        //必须关闭不数据无法写到缓存区域        sqlSession1.close();        // 获取会话工厂        SqlSession sqlSession2 = sqlSessionFactory.openSession();        AuthorMapper authorMapper2 = sqlSession2.getMapper(AuthorMapper.class);        Author author2 = authorMapper2.findAuthorById(2);        //更新        author2.setAuthorUserName("董事长");        author2.setAuthroBio("公司");        authorMapper2.updateAuthor(author2);        //commit会清空缓存区域        sqlSession2.commit();        sqlSession2.close();        // 获取会话工厂        SqlSession sqlSession3 = sqlSessionFactory.openSession();        AuthorMapper authorMapper3 = sqlSession3.getMapper(AuthorMapper.class);        // 第一次查询        Author author3 = authorMapper3.findAuthorById(2);        sqlSession3.close();    }

结果：

DEBUG [main] - Cache Hit Ratio [com.pb.mybatis.mapper.AuthorMapper]: 0.0DEBUG [main] - Opening JDBC ConnectionDEBUG [main] - Created connection 873769339.DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - ==>  Preparing: select * from author where author_id=? DEBUG [main] - ==> Parameters: 2(Integer)DEBUG [main] - <==      Total: 1DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - Returned connection 873769339 to pool.DEBUG [main] - Cache Hit Ratio [com.pb.mybatis.mapper.AuthorMapper]: 0.5DEBUG [main] - Opening JDBC ConnectionDEBUG [main] - Checked out connection 873769339 from pool.DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - ==>  Preparing: update author SET author_username=?, author_password=?, author_email=?, author_bio=?, register_time=? where author_id=? DEBUG [main] - ==> Parameters: 董事长(String), 123asf(String), lisi@163.com(String), 公司(String), 2015-10-29 10:24:29.0(Timestamp), 2(Integer)DEBUG [main] - <==    Updates: 1DEBUG [main] - Committing JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - Returned connection 873769339 to pool.DEBUG [main] - Cache Hit Ratio [com.pb.mybatis.mapper.AuthorMapper]: 0.3333333333333333DEBUG [main] - Opening JDBC ConnectionDEBUG [main] - Checked out connection 873769339 from pool.DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - ==>  Preparing: select * from author where author_id=? DEBUG [main] - ==> Parameters: 2(Integer)DEBUG [main] - <==      Total: 1DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@3414a97b]DEBUG [main] - Returned connection 873769339 to pool.

八、Mybatis与ehcache整合

8.1、把jar包导入项目

8.2、建立ehcache.xml

ehcache.xml

8.3、在mapper的cache中指定type

8.4、测试

@Test    public void testCache() {        // 获取会话工厂        SqlSession sqlSession1 = sqlSessionFactory.openSession();        AuthorMapper authorMapper1 = sqlSession1.getMapper(AuthorMapper.class);        // 第一次查询        Author author1 = authorMapper1.findAuthorById(2);        //必须关闭不数据无法写到缓存区域        sqlSession1.close();        // 获取会话工厂        SqlSession sqlSession2 = sqlSessionFactory.openSession();        AuthorMapper authorMapper2 = sqlSession2.getMapper(AuthorMapper.class);        Author author2 = authorMapper2.findAuthorById(2);        //更新        author2.setAuthorUserName("董事长");        author2.setAuthroBio("公司");        authorMapper2.updateAuthor(author2);        //commit会清空缓存区域        sqlSession2.commit();        sqlSession2.close();        // 获取会话工厂        SqlSession sqlSession3 = sqlSessionFactory.openSession();        AuthorMapper authorMapper3 = sqlSession3.getMapper(AuthorMapper.class);        // 第一次查询        Author author3 = authorMapper3.findAuthorById(2);        sqlSession3.close();    }

结果：

DEBUG [main] - Configuring ehcache from ehcache.xml found in the classpath: file:/E:/mywork/MybatisDemo2/bin/ehcache.xmlDEBUG [main] - Configuring ehcache from URL: file:/E:/mywork/MybatisDemo2/bin/ehcache.xmlDEBUG [main] - Configuring ehcache from InputStreamDEBUG [main] - Ignoring ehcache attribute xmlns:xsiDEBUG [main] - Ignoring ehcache attribute xsi:noNamespaceSchemaLocationDEBUG [main] - Disk Store Path: F:\develop\ehcacheDEBUG [main] - Creating new CacheManager with default configDEBUG [main] - propertiesString is null.DEBUG [main] - No CacheManagerEventListenerFactory class specified. Skipping...DEBUG [main] - No BootstrapCacheLoaderFactory class specified. Skipping...DEBUG [main] - CacheWriter factory not configured. Skipping...DEBUG [main] - No CacheExceptionHandlerFactory class specified. Skipping...DEBUG [main] - Initialized net.sf.ehcache.store.NotifyingMemoryStore for com.pb.mybatis.mapper.AuthorMapperDEBUG [main] - Initialised cache: com.pb.mybatis.mapper.AuthorMapperDEBUG [main] - CacheDecoratorFactory not configured for defaultCache. Skipping for 'com.pb.mybatis.mapper.AuthorMapper'.DEBUG [main] - Cache Hit Ratio [com.pb.mybatis.mapper.AuthorMapper]: 0.0DEBUG [main] - Opening JDBC ConnectionDEBUG [main] - Created connection 1286943672.DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@4cb533b8]DEBUG [main] - ==>  Preparing: select * from author where author_id=? DEBUG [main] - ==> Parameters: 2(Integer)DEBUG [main] - <==      Total: 1DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@4cb533b8]DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@4cb533b8]DEBUG [main] - Returned connection 1286943672 to pool.DEBUG [main] - Cache Hit Ratio [com.pb.mybatis.mapper.AuthorMapper]: 0.5DEBUG [main] - Opening JDBC ConnectionDEBUG [main] - Checked out connection 1286943672 from pool.DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@4cb533b8]DEBUG [main] - ==>  Preparing: update author SET author_username=?, author_password=?, author_email=?, author_bio=?, register_time=? where author_id=? DEBUG [main] - ==> Parameters: 董事长(String), 123asf(String), lisi@163.com(String), 公司(String), 2015-10-29 10:24:29.0(Timestamp), 2(Integer)DEBUG [main] - <==    Updates: 1DEBUG [main] - Committing JDBC Connection [com.mysql.jdbc.JDBC4Connection@4cb533b8]DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@4cb533b8]DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@4cb533b8]DEBUG [main] - Returned connection 1286943672 to pool.DEBUG [main] - Cache Hit Ratio [com.pb.mybatis.mapper.AuthorMapper]: 0.3333333333333333DEBUG [main] - Opening JDBC ConnectionDEBUG [main] - Checked out connection 1286943672 from pool.DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@4cb533b8]DEBUG [main] - ==>  Preparing: select * from author where author_id=? DEBUG [main] - ==> Parameters: 2(Integer)DEBUG [main] - <==      Total: 1DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@4cb533b8]DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@4cb533b8]DEBUG [main] - Returned connection 1286943672 to pool.

转载于:https://www.cnblogs.com/liunanjava/p/4925553.html

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