MyBatis 综合例子

步骤 1：创建数据库

/*
SQLyog Professional v12.08 (64 bit)
MySQL - 5.7.22-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 (
id int(11) NOT NULL AUTO_INCREMENT,
username varchar(100) DEFAULT NULL,
password varchar(100) DEFAULT NULL,
email varchar(100) DEFAULT NULL,
bio varchar(100) DEFAULT NULL,
favourite_section varchar(100) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=306 DEFAULT CHARSET=utf8;

/Data for the table author /

insert into author(id,username,password,email,bio,favourite_section) values (301,'克林顿','123456',' [email protected]','MyBatis团队成员','打球'),(302,'布兰登','123456',' [email protected]','MyBatis团队成员','听歌'),(303,'亚当','123456','[email protected]','MyBatis团队贡献者','游泳');

/Table structure for table blog /

DROP TABLE IF EXISTS blog;

CREATE TABLE blog (
id int(11) NOT NULL AUTO_INCREMENT,
title varchar(100) DEFAULT NULL,
author_id int(11) DEFAULT NULL,
content varchar(1000) DEFAULT NULL,
state varchar(100) DEFAULT NULL,
featured int(11) DEFAULT NULL,
PRIMARY KEY (id),
KEY author_id (author_id)
) ENGINE=InnoDB AUTO_INCREMENT=104 DEFAULT CHARSET=utf8;

/Data for the table blog /

insert into blog(id,title,author_id,content,state,featured) values (101,'MyBatis',301,'MyBatis https://mybatis.org/mybatis-3/','ACTIVE',1),(102,'MyBatis Github',302,'MyBatis Github https://github.com/mybatis/mybatis-3/tree/master/src/site','ACTIVE',2),(103,'MyBatis Blog',303,'MyBatis Blog https://blog.mybatis.org/','INACTIVE',3);

/Table structure for table comment /

DROP TABLE IF EXISTS comment;

CREATE TABLE comment (
id int(11) NOT NULL AUTO_INCREMENT,
post_id int(11) DEFAULT NULL,
name varchar(100) DEFAULT NULL,
comment varchar(100) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=605 DEFAULT CHARSET=utf8;

/Data for the table comment /

insert into comment(id,post_id,name,comment) values (601,501,'好评1','看起来不错！谢谢@ kazuki43zoo！'),(602,502,'好评2','非常感谢您的帮助@ huan0huan！'),(603,503,'差评3','为什么不保留Java中SQL的灵活性和语法感觉？'),(604,504,'好评4','非常感谢您的解答');

/Table structure for table person /

DROP TABLE IF EXISTS person;

CREATE TABLE person (
id int(11) NOT NULL AUTO_INCREMENT,
username varchar(100) DEFAULT NULL,
password varchar(100) DEFAULT NULL,
full_name varchar(100) DEFAULT NULL,
first_name varchar(100) DEFAULT NULL,
last_name varchar(100) DEFAULT NULL,
date_of_birth date DEFAULT NULL,
created_on date DEFAULT NULL,
update_on date DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=204 DEFAULT CHARSET=utf8;

/Data for the table person /

insert into person(id,username,password,full_name,first_name,last_name,date_of_birth,created_on,update_on) values (201,'emacarron','123456','爱德华多·马卡龙','爱德华多','马卡龙','2000-01-01','2020-01-01','2020-01-02'),(202,'mnesarco','123456','弗兰克·马丁内斯','弗兰克','马丁内斯','2000-01-01','2020-01-01','2020-01-02'),(203,'agustafson','123456','安德鲁·古斯塔夫森','安德鲁','古斯塔夫森','2000-01-01','2020-01-01','2020-01-02');

/Table structure for table post /

DROP TABLE IF EXISTS post;

CREATE TABLE post (
id int(11) NOT NULL AUTO_INCREMENT,
blog_id int(11) DEFAULT NULL,
author_id int(11) DEFAULT NULL,
created_on date DEFAULT NULL,
section varchar(100) DEFAULT NULL,
subject varchar(100) DEFAULT NULL,
draft int(11) DEFAULT NULL,
body varchar(1000) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=505 DEFAULT CHARSET=utf8;

/Data for the table post /

insert into post(id,blog_id,author_id,created_on,section,subject,draft,body) values (501,101,301,'2020-02-01','1','MyBatis 3.5.1',1,'以下是用户可见更改的列表。用参数名称指定的keyProperty可能导致ExecutorException。＃1485'),(502,102,302,'2020-02-02','2','MyBatis 3.5.2',1,'以下是用户可见更改的列表。SQL Builder现在支持LIMIT，OFFSET ＃1521和FETCH FIRST ＃1582。'),(503,103,303,'2020-02-03','3','MyBatis 3.5.3',1,'以下是用户可见更改的列表。在包含的的CDATA中支持变量替换。＃1615'),(504,101,301,'2020-02-01','1','MyBatis 3.5.4',1,'以下是用户可见更改的列表。用参数名称指定的keyProperty可能导致ExecutorException。＃4');

/Table structure for table post_tag /

DROP TABLE IF EXISTS post_tag;

CREATE TABLE post_tag (
id int(11) NOT NULL AUTO_INCREMENT,
post_id int(11) DEFAULT NULL,
tag_id int(11) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=805 DEFAULT CHARSET=utf8;

/Data for the table post_tag /

insert into post_tag(id,post_id,tag_id) values (801,501,701),(802,502,702),(803,503,703),(804,504,704);

/Table structure for table tag /

DROP TABLE IF EXISTS tag;

CREATE TABLE tag (
id int(11) NOT NULL AUTO_INCREMENT,
name varchar(100) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=705 DEFAULT CHARSET=utf8;

/Data for the table tag /

insert into tag(id,name) values (701,'Alpha'),(702,'Beta'),(703,'RC'),(704,'GA');

/Table structure for table users /

DROP TABLE IF EXISTS users;

CREATE TABLE users (
user_id int(11) NOT NULL AUTO_INCREMENT,
user_name varchar(100) DEFAULT NULL,
hashed_password varchar(100) DEFAULT NULL,
email varchar(100) DEFAULT NULL,
PRIMARY KEY (user_id)
) ENGINE=InnoDB AUTO_INCREMENT=413 DEFAULT CHARSET=utf8;

/Data for the table users /

insert into users(user_id,user_name,hashed_password,email) values (401,'admin','123456','admin@@gmail.com'),(402,'user','123456','[email protected]'),(403,'guest','123456','[email protected]'),(411,'test','123456','[email protected]'),(412,'test2','123456','[email protected]');

/Table structure for table vehicle /

DROP TABLE IF EXISTS vehicle;

CREATE TABLE vehicle (
id int(11) NOT NULL AUTO_INCREMENT,
vin varchar(100) DEFAULT NULL,
year varchar(100) DEFAULT NULL,
make varchar(100) DEFAULT NULL,
model varchar(100) DEFAULT NULL,
color varchar(100) DEFAULT NULL,
vehicle_type int(11) DEFAULT NULL,
door_count int(11) DEFAULT NULL,
box_size int(11) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=904 DEFAULT CHARSET=utf8;

/Data for the table vehicle /

insert into vehicle(id,vin,year,make,model,color,vehicle_type,door_count,box_size) values (901,'奔驰汽车','1883','德国奔驰汽车公司','AMG GT4','绿色',1,2,NULL),(902,'麦克卡车','1940','麦克制造公司','Mack NR','白色',2,NULL,4),(903,'雷诺货车','1941','美国雷诺货车公司','LCV','红色',3,NULL,NULL);

/ Procedure structure for procedure getBlogsAndAuthors /

/!50003 DROP PROCEDURE IF EXISTS getBlogsAndAuthors /;

DELIMITER $$

/!50003 CREATE DEFINER=root@localhost PROCEDURE getBlogsAndAuthors(IN blog_id INT, IN author_id INT)
BEGIN
SELECT FROM BLOG WHERE ID = blog_id;
SELECT FROM AUTHOR WHERE ID = author_id;
END /$$
DELIMITER ;

/ Procedure structure for procedure getBlogsAndPosts /

/!50003 DROP PROCEDURE IF EXISTS getBlogsAndPosts /;

DELIMITER $$

/!50003 CREATE DEFINER=root@localhost PROCEDURE getBlogsAndPosts(IN in_id INT)
BEGIN
SELECT FROM BLOG WHERE ID = in_id;
SELECT FROM POST WHERE BLOG_ID = in_id;
END /$$
DELIMITER ;

/!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 /;
步骤 2：使用IDE创建Maven项目

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">;
4.0.0
org.mybatis
example
0.0.1-SNAPSHOT
example
example

    
        org.mybatis
        mybatis
        3.5.4
    
    
        mysql
        mysql-connector-java
        5.1.48
    
    
        log4j
        log4j
        1.2.17
    
    
        junit
        junit
        4.12
    

步骤 3：配置MyBatis

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/mybatis
username=root
password_dev=123456
password_pro=12345678

PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">;

全局日志配置

log4j.rootLogger=ERROR, stdout

MyBatis 日志配置

log4j.logger.org.mybatis.example=DEBUG

控制台输出

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
步骤 4：创建MyBatis工具类

package org.mybatis.example.util;

import java.io.IOException;
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;

/**

• MyBatis工具类
• @author 大强

• */
  public class MyBatisUtil {

  public static SqlSessionFactory sqlSessionFactory;

  static {
  try {
  // 从类路径下加载资源文件mybatis-config.xml
  String resource = "org/mybatis/example/mybatis-config.xml";
  InputStream inputStream = Resources.getResourceAsStream(resource);
  // 由 SqlSessionFactoryBuilder创建SqlSessionFactory
  sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
  } catch (IOException e) {
  e.printStackTrace();
  }
  }

  /**

  • 由 SqlSessionFactory创建SqlSession
  • @return
    */
    public static SqlSession getSqlSession() {
    return sqlSessionFactory.openSession();
    }

  /**

  • 关闭SqlSession
  • @param sqlSession
    */
    public static void closeSqlSession(SqlSession sqlSession) {
    if (sqlSession != null) {
    sqlSession.close();
    }
    }

}
步骤 5：创建POJO类

package org.mybatis.example.domain;

/**

• 作者POJO类
• @author 大强

• */
  public class Author {
  public int id;
  // public int authorid;
  public String username;
  public String password;
  public String email;
  public String bio;
  public String favouriteSection;

// public int getAuthorid() {
// return authorid;
// }
//
// public void setAuthorid(int authorid) {
// this.authorid = authorid;
// }

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 getFavouriteSection() {
    return favouriteSection;
}

public void setFavouriteSection(String favouriteSection) {
    this.favouriteSection = favouriteSection;
}

}
package org.mybatis.example.domain;

import java.util.List;

/**

• 博客POJO类
• @author 大强

• */
  public class Blog {

  public int id;
  public String title;
  public String authorId;
  public String content;
  public String state;

  // 一对一
  // 作者
  public Author author;

  // 一对多
  // 文章
  public List posts;

  public Blog(Integer id) {
  super();
  this.id = id;
  }

  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 String getAuthorId() {
  return authorId;
  }

  public void setAuthorId(String authorId) {
  this.authorId = authorId;
  }

  public String getContent() {
  return content;
  }

  public void setContent(String content) {
  this.content = content;
  }

  public Author getAuthor() {
  return author;
  }

  public void setAuthor(Author author) {
  this.author = author;
  }

  public List getPosts() {
  return posts;
  }

  public void setPosts(List posts) {
  this.posts = posts;
  }

  public String getState() {
  return state;
  }

  public void setState(String state) {
  this.state = state;
  }

}
package org.mybatis.example.domain;

/**

• 汽车POJO类
• @author 大强

• */
  public class Car extends Vehicle {

  // Car
  public String doorCount;

  public String getDoorCount() {
  return doorCount;
  }

  public void setDoorCount(String doorCount) {
  this.doorCount = doorCount;
  }

}
package org.mybatis.example.domain;

/**

• 评论POJO类
• @author 大强

• */
  public class Comment {

  public int id;
  public int postId;
  public String name;
  public String comment;

  public int getId() {
  return id;
  }

  public void setId(int id) {
  this.id = id;
  }

  public int getPostId() {
  return postId;
  }

  public void setPostId(int postId) {
  this.postId = postId;
  }

  public String getName() {
  return name;
  }

  public void setName(String name) {
  this.name = name;
  }

  public String getComment() {
  return comment;
  }

  public void setComment(String comment) {
  this.comment = comment;
  }

}
package org.mybatis.example.domain;

/**

• 草稿文章POJO类
• @author 大强

• */
  public class DraftPost extends Post {

  public String draftBody;

  public String getDraftBody() {
  return draftBody;
  }

  public void setDraftBody(String draftBody) {
  this.draftBody = draftBody;
  }

}
package org.mybatis.example.domain;

import java.util.Date;

/**

• 人员POJO类
• @author 大强

• */
  public class Person {

  public int id;
  public String username;
  public String password;
  public String fullName;
  public String firstName;
  public String lastName;
  public Date dateOfBirth;
  public Date createdOn;
  public Date updateOn;

  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 getFullName() {
  return fullName;
  }

  public void setFullName(String fullName) {
  this.fullName = fullName;
  }

  public String getFirstName() {
  return firstName;
  }

  public void setFirstName(String firstName) {
  this.firstName = firstName;
  }

  public String getLastName() {
  return lastName;
  }

  public void setLastName(String lastName) {
  this.lastName = lastName;
  }

  public Date getDateOfBirth() {
  return dateOfBirth;
  }

  public void setDateOfBirth(Date dateOfBirth) {
  this.dateOfBirth = dateOfBirth;
  }

  public Date getCreatedOn() {
  return createdOn;
  }

  public void setCreatedOn(Date createdOn) {
  this.createdOn = createdOn;
  }

  public Date getUpdateOn() {
  return updateOn;
  }

  public void setUpdateOn(Date updateOn) {
  this.updateOn = updateOn;
  }

}
package org.mybatis.example.domain;

import java.util.Date;
import java.util.List;

/**

• 文章POJO类
• @author 大强

• */
  public class Post {

  public int id;
  public int blogId;
  public int authorId;
  public Date createdOn;
  public String section;
  public String subject;
  public String draft;
  public String body;

  public Author author;

  public List comments;

  public List tags;

  public int getId() {
  return id;
  }

  public void setId(int id) {
  this.id = id;
  }

  public int getBlogId() {
  return blogId;
  }

  public void setBlogId(int blogId) {
  this.blogId = blogId;
  }

  public int getAuthorId() {
  return authorId;
  }

  public void setAuthorId(int authorId) {
  this.authorId = authorId;
  }

  public Date getCreatedOn() {
  return createdOn;
  }

  public void setCreatedOn(Date createdOn) {
  this.createdOn = 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;
  }

  public List getComments() {
  return comments;
  }

  public void setComments(List comments) {
  this.comments = comments;
  }

  public List getTags() {
  return tags;
  }

  public void setTags(List tags) {
  this.tags = tags;
  }

  public Author getAuthor() {
  return author;
  }

  public void setAuthor(Author author) {
  this.author = author;
  }

}
package org.mybatis.example.domain;

/**

• 标签POJO类
• @author 大强

• */
  public class Tag {

  public int id;

  public String name;

  public int getId() {
  return id;
  }

  public void setId(int id) {
  this.id = id;
  }

  public String getName() {
  return name;
  }

  public void setName(String name) {
  this.name = name;
  }

}
package org.mybatis.example.domain;

/**

• 卡车POJO类
• @author 大强

• */
  public class Truck extends Vehicle {

  // Truck
  public String boxSize;

  public String getBoxSize() {
  return boxSize;
  }

  public void setBoxSize(String boxSize) {
  this.boxSize = boxSize;
  }

}
package org.mybatis.example.domain;

/**

• 用户POJO类
• @author 大强

• */
  public class User {

  public int id;
  public String username;
  public String password;
  // public String hashedPassword;
  public String email;

// public User(Integer id, String username, String password) {
// super();
// this.id = id;
// this.username = username;
// this.password = password;
// }

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 getHashedPassword() {
// return hashedPassword;
// }
//
// public void setHashedPassword(String hashedPassword) {
// this.hashedPassword = hashedPassword;
// }

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

}
package org.mybatis.example.domain;

/**

• 车辆POJO类
• @author 大强

• */
  public class Vehicle {

  public int id;
  public String vin;
  public String year;
  public String make;
  public String model;
  public String color;
  // 1:Car 2:Truck
  public String vehicleType;

  // Car
  // public String doorCount;

  // Truck
  // public String boxSize;

  public int getId() {
  return id;
  }

  public void setId(int id) {
  this.id = id;
  }

  public String getVin() {
  return vin;
  }

  public void setVin(String vin) {
  this.vin = vin;
  }

  public String getYear() {
  return year;
  }

  public void setYear(String year) {
  this.year = year;
  }

  public String getMake() {
  return make;
  }

  public void setMake(String make) {
  this.make = make;
  }

  public String getModel() {
  return model;
  }

  public void setModel(String model) {
  this.model = model;
  }

  public String getColor() {
  return color;
  }

  public void setColor(String color) {
  this.color = color;
  }

  public String getVehicleType() {
  return vehicleType;
  }

  public void setVehicleType(String vehicleType) {
  this.vehicleType = vehicleType;
  }

}
步骤 6：创建映射器接口类

package org.mybatis.example.mapper;

import java.util.List;

import org.mybatis.example.domain.Blog;

/**

• 博客映射器
• @author 大强

• */
  public interface BlogMapper {

  List selectBlogDetails(int id);

}
步骤 7：创建映射器XML文件

PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">;

    select
    B.id as blog_id,
    B.title as blog_title,
    B.author_id as blog_author_id,
    A.id as author_id,
    A.username as author_username,
    A.password as author_password,
    A.email as
    author_email,
    A.bio as author_bio,
    A.favourite_section as
    author_favourite_section,
    P.id as post_id,
    P.blog_id as post_blog_id,
    P.author_id as post_author_id,
    P.created_on as post_created_on,
    P.section as post_section,
    P.subject as post_subject,
    P.draft as draft,
    P.body as post_body,
    C.id as comment_id,
    C.post_id as comment_post_id,
    C.name as comment_name,
    C.comment as comment_text,
    T.id as tag_id,
    T.name as tag_name
    from Blog B
    left outer join Author A on B.author_id =
    A.id
    left outer join Post P on B.id = P.blog_id
    left outer join Comment
    C on P.id = C.post_id
    left outer join Post_Tag PT on PT.post_id = P.id
    left outer join Tag T on PT.tag_id = T.id
    where B.id = #{id}



    
        
    
    
    
        
        
        
        
        
        
    
    
        
        
        
        
            
        
        
            
        
        
            
        
    



    
    

package org.mybatis.example.mapper;

import java.util.List;

import org.apache.ibatis.session.SqlSession;
import org.apache.log4j.Logger;
import org.junit.Test;
import org.mybatis.example.domain.Blog;
import org.mybatis.example.util.MyBatisUtil;

/**

• Author测试类
• @author 大强

• */
  public class BlogMapperTest {

  Logger logger = Logger.getLogger(BlogMapperTest.class);

  // 注意：选中方法名，单击鼠标右键，选择 Run as -> JUnit Test，就能执行单个方法。

  /**

  • 非常复杂的结果映射测试方法br/>*/
    @Test
    public void detailedBlogResultMapTest() {
    logger.info("非常复杂的结果映射开始...");
    SqlSession session = MyBatisUtil.getSqlSession();
    BlogMapper mapper = session.getMapper(BlogMapper.class);
    List list = mapper.selectBlogDetails(101);
    if (list != null) {
    for (Blog blog : list) {
    logger.info(blog.getId());
    logger.info(blog.getTitle());
    }
    }
    MyBatisUtil.closeSqlSession(session);
    logger.info("非常复杂的结果映射结束");
    }

}