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MyBatis 综合例子

运维开发网 https://www.qedev.com 2020-04-15 18:01 出处：51CTO 作者：dahua012
步骤1：创建数据库/*SQLyogProfessionalv12.08(64bit)MySQL-5.7.22-log:Database-mybatis*//!40101SETNAMESutf8/;/!40101SETSQL_MODE=''/;/!40014SET@OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS,UNIQUE_CHECKS=0/;/!40014SE
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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',' clinton.begin@gmail.com','MyBatis团队成员','打球'),(302,'布兰登','123456',' brandon.goodin@gmail.com','MyBatis团队成员','听歌'),(303,'亚当','123456','adam.gent@evocatus.com','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<sql />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','user@gmail.com'),(403,'guest','123456','guest@gmail.com'),(411,'test','123456','test@gmail.com'),(412,'test2','123456','test2@gmail.com');

/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

<project xmlns="http://maven.apache.org/POM/4.0.0"

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">

<modelVersion>4.0.0</modelVersion>

<groupId>org.mybatis</groupId>

<artifactId>example</artifactId>

<version>0.0.1-SNAPSHOT</version>

<name>example</name>

<description>example</description>

<dependencies>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.4</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.48</version>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
</dependencies>

</project>

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

<?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>

<!-- 属性（properties） -->

<properties resource="org/mybatis/example/config.properties">

<!-- <property name="username" value="root" /> -->

<!-- <property name="password" value="123456" /> -->

</properties>

<!-- 设置（settings） -->
<settings>
    <setting name="cacheEnabled" value="true" />
    <setting name="autoMappingBehavior" value="PARTIAL" />
    <setting name="logImpl" value="LOG4J" />
</settings>

<!-- 类型别名（typeAliases） -->

<!-- <typeAliases> -->
<!-- <typeAlias alias="Blog" type="org.mybatis.example.Blog" /> -->
<!-- </typeAliases> -->

<typeAliases>
    <package name="org.mybatis.example.domain" />
</typeAliases>

<!-- 环境配置（environments） -->
<environments default="development">
    <environment id="development">
        <transactionManager type="JDBC" />
        <dataSource type="POOLED">
            <property name="driver" value="${driver}" />
            <property name="url" value="${url}" />
            <property name="username" value="${username}" />
            <property name="password" value="${password_dev}" />
        </dataSource>
    </environment>
    <environment id="production">
        <transactionManager type="JDBC" />
        <dataSource type="POOLED">
            <property name="driver" value="${driver}" />
            <property name="url" value="${url}" />
            <property name="username" value="${username}" />
            <property name="password" value="${password_pro}" />
        </dataSource>
    </environment>
</environments>

<!-- 数据库厂商标识（databaseIdProvider） -->
<databaseIdProvider type="DB_VENDOR">
    <property name="MySQL" value="mysql" />
    <property name="SQL Server" value="sqlserver" />
    <property name="DB2" value="db2" />
    <property name="Oracle" value="oracle" />
</databaseIdProvider>

<!-- 映射器（mappers） -->
<!-- <mappers> -->
<!-- <mapper resource="org/mybatis/example/BlogMapper.xml" /> -->
<!-- <mapper resource="org/mybatis/example/PersonMapper.xml" /> -->
<!-- </mappers> -->
<mappers>
    <package name="org.mybatis.example.mapper" />
</mappers>

</configuration>

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<Post> 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<Post> getPosts() {

    return posts;

    }

    public void setPosts(List<Post> 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<Comment> comments;

    public List<Tag> 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<Comment> getComments() {

    return comments;

    }

    public void setComments(List<Comment> comments) {

    this.comments = comments;

    }

    public List<Tag> getTags() {

    return tags;

    }

    public void setTags(List<Tag> 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<Blog> selectBlogDetails(int id);

}

步骤 7：创建映射器XML文件

<?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="org.mybatis.example.mapper.BlogMapper">

<!-- 非常复杂的语句 -->
<select id="selectBlogDetails" resultMap="detailedBlogResultMap">
    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}
</select>

<resultMap id="detailedBlogResultMap" type="Blog">
    <constructor>
        <idArg column="blog_id" javaType="int" />
    </constructor>
    <result property="title" column="blog_title" />
    <association property="author" javaType="Author">
        <id property="id" column="author_id" />
        <result property="username" column="author_username" />
        <result property="password" column="author_password" />
        <result property="email" column="author_email" />
        <result property="bio" column="author_bio" />
        <result property="favouriteSection"
            column="author_favourite_section" />
    </association>
    <collection property="posts" ofType="Post">
        <id property="id" column="post_id" />
        <result property="subject" column="post_subject" />
        <association property="author" javaType="Author" />
        <collection property="comments" ofType="Comment">
            <id property="id" column="comment_id" />
        </collection>
        <collection property="tags" ofType="Tag">
            <id property="id" column="tag_id" />
        </collection>
        <discriminator javaType="int" column="draft">
            <case value="1" resultMap="draftPostResult" />
        </discriminator>
    </collection>
</resultMap>

<resultMap id="draftPostResult" type="DraftPost">
    <result property="subject" column="post_subject" />
    <result property="draftBody" column="post_body" />
</resultMap>

</mapper>

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*/

      @Test
      br/>*/

      @Test
      logger.info("非常复杂的结果映射开始...");

      SqlSession session = MyBatisUtil.getSqlSession();

      BlogMapper mapper = session.getMapper(BlogMapper.class);

      List<Blog> 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");

      }

}

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