MyBatis Tutorial – CRUD Operations and Mapping Relationships – Part 1---- reference

http://www.javacodegeeks.com/2012/11/mybatis-tutorial-crud-operations-and-mapping-relationships-part-1.html

CRUD Operations
MyBatis is an SQL Mapper tool which greatly simplifies the database programing when compared to using JDBC directly.

Step1: Create a Maven project and configure MyBatis dependencies.

01 <project xmlns=‘http://maven.apache.org/POM/4.0.0‘
02  xmlns:xsi=‘http://www.w3.org/2001/XMLSchema-instance‘
03  xsi:schemaLocation=‘http://maven.apache.org/POM/4.0.0
04  
05 http://maven.apache.org/xsd/maven-4.0.0.xsd‘>
06  
07  <modelVersion>4.0.0</modelVersion>
08  
09  <groupId>com.sivalabs</groupId>
10  <artifactId>mybatis-demo</artifactId>
11  <version>0.0.1-SNAPSHOT</version>
12  <packaging>jar</packaging>
13  
14  <name>mybatis-demo</name>
15  <url>http://maven.apache.org</url>
16  
17  <properties>
18   <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
19  </properties>
20  
21  <build>
22   <plugins>
23    <plugin>
24     <groupId>org.apache.maven.plugins</groupId>
25     <artifactId>maven-compiler-plugin</artifactId>
26     <version>2.3.2</version>
27     <configuration>
28      <source>1.6</source>
29      <target>1.6</target>
30      <encoding>${project.build.sourceEncoding}</encoding>
31     </configuration>
32    </plugin>
33   </plugins>
34  </build>
35  
36  <dependencies>
37   <dependency>
38    <groupId>junit</groupId>
39    <artifactId>junit</artifactId>
40    <version>4.10</version>
41    <scope>test</scope>
42   </dependency>
43  
44   <dependency>
45       <groupId>org.mybatis</groupId>
46       <artifactId>mybatis</artifactId>
47       <version>3.1.1</version>
48   </dependency>
49   <dependency>
50              <groupId>mysql</groupId>
51              <artifactId>mysql-connector-java</artifactId>
52              <version>5.1.21</version>
53              <scope>runtime</scope>
54          </dependency>
55  </dependencies>
56 </project>

Step#2: Create the table USER and a Java domain Object User as follows:

1 CREATE TABLE  user (
2   user_id int(10) unsigned NOT NULL auto_increment,
3   email_id varchar(45) NOT NULL,
4   password varchar(45) NOT NULL,
5   first_name varchar(45) NOT NULL,
6   last_name varchar(45) default NULL,
7   PRIMARY KEY  (user_id),
8   UNIQUE KEY Index_2_email_uniq (email_id)
9 ) ENGINE=InnoDB DEFAULT CHARSET=latin1;
01 package com.sivalabs.mybatisdemo.domain;
02 public class User
03 {
04  private Integer userId;
05  private String emailId;
06  private String password;
07  private String firstName;
08  private String lastName;
09  
10  @Override
11  public String toString() {
12   return ‘User [userId=‘ + userId + ‘, emailId=‘ + emailId
13     + ‘, password=‘ + password + ‘, firstName=‘ + firstName
14     + ‘, lastName=‘ + lastName + ‘]‘;
15  }
16  //setters and getters
17 }

Step#3: Create MyBatis configuration files.

a) Create jdbc.properties file in src/main/resources folder

1 jdbc.driverClassName=com.mysql.jdbc.Driver
2 jdbc.url=jdbc:mysql://localhost:3306/mybatis-demo
3 jdbc.username=root
4 jdbc.password=admin

b) Create mybatis-config.xml file in src/main/resources folder

01 <?xml version=‘1.0‘ encoding=‘UTF-8‘ ?>
02 <!DOCTYPE configuration
03   PUBLIC ‘-//mybatis.org//DTD Config 3.0//EN‘
04   ‘http://mybatis.org/dtd/mybatis-3-config.dtd‘>
05 <configuration>
06  <properties resource=‘jdbc.properties‘/>
07  <typeAliases>
08   <typeAlias type=‘com.sivalabs.mybatisdemo.domain.User‘ alias=‘User‘></typeAlias>
09  </typeAliases>
10  <environments default=‘development‘>
11   <environment id=‘development‘>
12     <transactionManager type=‘JDBC‘/>
13     <dataSource type=‘POOLED‘>   
14    <property name=‘driver‘ value=‘${jdbc.driverClassName}‘/>
15    <property name=‘url‘ value=‘${jdbc.url}‘/>
16    <property name=‘username‘ value=‘${jdbc.username}‘/>
17    <property name=‘password‘ value=‘${jdbc.password}‘/>
18     </dataSource>
19   </environment>
20   </environments>
21   <mappers>
22  <mapper resource=‘com/sivalabs/mybatisdemo/mappers/UserMapper.xml‘/>
23   </mappers>
24 </configuration>

Step#4: Create an interface UserMapper.java in src/main/java folder in com.sivalabs.mybatisdemo.mappers package.

01 package com.sivalabs.mybatisdemo.mappers;
02  
03 import java.util.List;
04 import com.sivalabs.mybatisdemo.domain.User;
05  
06 public interface UserMapper
07 {
08  
09  public void insertUser(User user);
10  
11  public User getUserById(Integer userId);
12  
13  public List<User> getAllUsers();
14  
15  public void updateUser(User user);
16  
17  public void deleteUser(Integer userId);
18  
19 }

Step#5: Create UserMapper.xml file in src/main/resources folder in com.sivalabs.mybatisdemo.mappers package.

01 <?xml version=‘1.0‘ encoding=‘UTF-8‘ ?>
02 <!DOCTYPE mapper PUBLIC ‘-//mybatis.org//DTD Mapper 3.0//EN‘
03   ‘http://mybatis.org/dtd/mybatis-3-mapper.dtd‘>
04  
05 <mapper namespace=‘com.sivalabs.mybatisdemo.mappers.UserMapper‘>
06  
07   <select id=‘getUserById‘ parameterType=‘int‘ resultType=‘com.sivalabs.mybatisdemo.domain.User‘>
08      SELECT
09       user_id as userId,
10       email_id as emailId ,
11       password,
12       first_name as firstName,
13       last_name as lastName
14      FROM USER
15      WHERE USER_ID = #{userId}
16   </select>
17   <!-- Instead of referencing Fully Qualified Class Names we can register Aliases in mybatis-config.xml and use Alias names. -->
18    <resultMap type=‘User‘ id=‘UserResult‘>
19     <id property=‘userId‘ column=‘user_id‘/>
20     <result property=‘emailId‘ column=‘email_id‘/>
21     <result property=‘password‘ column=‘password‘/>
22     <result property=‘firstName‘ column=‘first_name‘/>
23     <result property=‘lastName‘ column=‘last_name‘/>  
24    </resultMap>
25  
26   <select id=‘getAllUsers‘ resultMap=‘UserResult‘>
27    SELECT * FROM USER
28   </select>
29  
30   <insert id=‘insertUser‘ parameterType=‘User‘ useGeneratedKeys=‘true‘ keyProperty=‘userId‘>
31    INSERT INTO USER(email_id, password, first_name, last_name)
32     VALUES(#{emailId}, #{password}, #{firstName}, #{lastName})
33   </insert>
34  
35   <update id=‘updateUser‘ parameterType=‘User‘>
36     UPDATE USER
37     SET
38      PASSWORD= #{password},
39      FIRST_NAME = #{firstName},
40      LAST_NAME = #{lastName}
41     WHERE USER_ID = #{userId}
42   </update>
43  
44   <delete id=‘deleteUser‘ parameterType=‘int‘>
45     DELETE FROM USER WHERE USER_ID = #{userId}
46   </delete>
47  
48 </mapper>

Step#6: Create MyBatisUtil.java to instantiate SqlSessionFactory.

01 package com.sivalabs.mybatisdemo.service;
02  
03 import java.io.IOException;
04 import java.io.Reader;
05 import org.apache.ibatis.io.Resources;
06 import org.apache.ibatis.session.SqlSessionFactory;
07 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
08  
09 public class MyBatisUtil
10 {
11  private static SqlSessionFactory factory;
12  
13  private MyBatisUtil() {
14  }
15  
16  static
17  {
18   Reader reader = null;
19   try {
20    reader = Resources.getResourceAsReader(‘mybatis-config.xml‘);
21   } catch (IOException e) {
22    throw new RuntimeException(e.getMessage());
23   }
24   factory = new SqlSessionFactoryBuilder().build(reader);
25  }
26  
27  public static SqlSessionFactory getSqlSessionFactory()
28  {
29   return factory;
30  }
31 }

Step#7: Create UserService.java in src/main/java folder.

01 package com.sivalabs.mybatisdemo.service;
02  
03 import java.util.List;
04 import org.apache.ibatis.session.SqlSession;
05 import com.sivalabs.mybatisdemo.domain.User;
06 import com.sivalabs.mybatisdemo.mappers.UserMapper;
07  
08 public class UserService
09 {
10  
11  public void insertUser(User user) {
12   SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
13   try{
14   UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
15   userMapper.insertUser(user);
16   sqlSession.commit();
17   }finally{
18    sqlSession.close();
19   }
20  }
21  
22  public User getUserById(Integer userId) {
23   SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
24   try{
25   UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
26   return userMapper.getUserById(userId);
27   }finally{
28    sqlSession.close();
29   }
30  }
31  
32  public List<User> getAllUsers() {
33   SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
34   try{
35   UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
36   return userMapper.getAllUsers();
37   }finally{
38    sqlSession.close();
39   }
40  }
41  
42  public void updateUser(User user) {
43   SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
44   try{
45   UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
46   userMapper.updateUser(user);
47   sqlSession.commit();
48   }finally{
49    sqlSession.close();
50   }
51  
52  }
53  
54  public void deleteUser(Integer userId) {
55   SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
56   try{
57   UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
58   userMapper.deleteUser(userId);
59   sqlSession.commit();
60   }finally{
61    sqlSession.close();
62   }
63  
64  }
65  
66 }

Step#8: Create a JUnit Test class to test UserService methods.

01 package com.sivalabs.mybatisdemo;
02  
03 import java.util.List;
04  
05 import org.junit.AfterClass;
06 import org.junit.Assert;
07 import org.junit.BeforeClass;
08 import org.junit.Test;
09  
10 import com.sivalabs.mybatisdemo.domain.User;
11 import com.sivalabs.mybatisdemo.service.UserService;
12  
13 public class UserServiceTest
14 {
15  private static UserService userService;
16  
17  @BeforeClass
18     public static void setup()
19  {
20   userService = new UserService();
21  }
22  
23  @AfterClass
24     public static void teardown()
25  {
26   userService = null;
27  }
28  
29     @Test
30  public void testGetUserById()
31  {
32   User user = userService.getUserById(1);
33   Assert.assertNotNull(user);
34   System.out.println(user);
35  }
36  
37     @Test
38     public void testGetAllUsers()
39     {
40   List<User> users = userService.getAllUsers();
41   Assert.assertNotNull(users);
42   for (User user : users)
43   {
44    System.out.println(user);
45   }
46  
47  }
48  
49     @Test
50     public void testInsertUser()
51     {
52      User user = new User();
53      user.setEmailId(‘test_email_‘+System.currentTimeMillis()+‘@gmail.com‘);
54      user.setPassword(‘secret‘);
55      user.setFirstName(‘TestFirstName‘);
56      user.setLastName(‘TestLastName‘);
57  
58      userService.insertUser(user);
59   Assert.assertTrue(user.getUserId() != 0);
60   User createdUser = userService.getUserById(user.getUserId());
61   Assert.assertNotNull(createdUser);
62   Assert.assertEquals(user.getEmailId(), createdUser.getEmailId());
63   Assert.assertEquals(user.getPassword(), createdUser.getPassword());
64   Assert.assertEquals(user.getFirstName(), createdUser.getFirstName());
65   Assert.assertEquals(user.getLastName(), createdUser.getLastName());
66  
67  }
68  
69     @Test
70     public void testUpdateUser()
71     {
72      long timestamp = System.currentTimeMillis();
73   User user = userService.getUserById(2);
74   user.setFirstName(‘TestFirstName‘+timestamp);
75      user.setLastName(‘TestLastName‘+timestamp);
76      userService.updateUser(user);
77   User updatedUser = userService.getUserById(2);
78   Assert.assertEquals(user.getFirstName(), updatedUser.getFirstName());
79   Assert.assertEquals(user.getLastName(), updatedUser.getLastName());
80  }
81  
82    @Test
83    public void testDeleteUser()
84    {
85      User user = userService.getUserById(4);
86      userService.deleteUser(user.getUserId());
87   User deletedUser = userService.getUserById(4);
88   Assert.assertNull(deletedUser);  
89  
90  }
91 }

Now, I will explain how to perform CRUD operations using MyBatis Annotation support without need of Queries configuration in XML mapper files.
 
Step#1: Create a table BLOG and a java domain Object Blog.

1 CREATE TABLE  blog (
2   blog_id int(10) unsigned NOT NULL auto_increment,
3   blog_name varchar(45) NOT NULL,
4   created_on datetime NOT NULL,
5   PRIMARY KEY  (blog_id)
6 ) ENGINE=InnoDB DEFAULT CHARSET=latin1;
01 package com.sivalabs.mybatisdemo.domain;
02  
03 import java.util.Date;
04  
05 public class Blog {
06  
07  private Integer blogId;
08  private String blogName;
09  private Date createdOn;
10  
11  @Override
12  public String toString() {
13   return ‘Blog [blogId=‘ + blogId + ‘, blogName=‘ + blogName
14     + ‘, createdOn=‘ + createdOn + ‘]‘;
15  }
16  //Seeters and getters
17 }

Step#2: Create UserMapper.java interface with SQL queries in Annotations.

01 package com.sivalabs.mybatisdemo.mappers;
02  
03 import java.util.List;
04  
05 import org.apache.ibatis.annotations.Delete;
06 import org.apache.ibatis.annotations.Insert;
07 import org.apache.ibatis.annotations.Options;
08 import org.apache.ibatis.annotations.Result;
09 import org.apache.ibatis.annotations.Results;
10 import org.apache.ibatis.annotations.Select;
11 import org.apache.ibatis.annotations.Update;
12  
13 import com.sivalabs.mybatisdemo.domain.Blog;
14  
15 public interface BlogMapper
16 {
17  @Insert(‘INSERT INTO BLOG(BLOG_NAME, CREATED_ON) VALUES(#{blogName}, #{createdOn})‘)
18  @Options(useGeneratedKeys=true, keyProperty=‘blogId‘)
19  public void insertBlog(Blog blog);
20  
21  @Select(‘SELECT BLOG_ID AS blogId, BLOG_NAME as blogName, CREATED_ON as createdOn FROM BLOG WHERE BLOG_ID=#{blogId}‘)
22  public Blog getBlogById(Integer blogId);
23  
24  @Select(‘SELECT * FROM BLOG ‘)
25  @Results({
26   @Result(id=true, property=‘blogId‘, column=‘BLOG_ID‘),
27   @Result(property=‘blogName‘, column=‘BLOG_NAME‘),
28   @Result(property=‘createdOn‘, column=‘CREATED_ON‘) 
29  })
30  public List<Blog> getAllBlogs();
31  
32  @Update(‘UPDATE BLOG SET BLOG_NAME=#{blogName}, CREATED_ON=#{createdOn} WHERE BLOG_ID=#{blogId}‘)
33  public void updateBlog(Blog blog);
34  
35  @Delete(‘DELETE FROM BLOG WHERE BLOG_ID=#{blogId}‘)
36  public void deleteBlog(Integer blogId);
37  
38 }

Step#3: Configure BlogMapper in mybatis-config.xml

01 <?xml version=‘1.0‘ encoding=‘UTF-8‘ ?>
02 <!DOCTYPE configuration
03   PUBLIC ‘-//mybatis.org//DTD Config 3.0//EN‘
04   ‘http://mybatis.org/dtd/mybatis-3-config.dtd‘>
05 <configuration>
06  <properties resource=‘jdbc.properties‘/>
07  <environments default=‘development‘>
08   <environment id=‘development‘>
09     <transactionManager type=‘JDBC‘/>
10     <dataSource type=‘POOLED‘>
11    <!-- <property name=‘driver‘ value=‘com.mysql.jdbc.Driver‘/>
12    <property name=‘url‘ value=‘jdbc:mysql://localhost:3306/mybatis-demo‘/>
13    <property name=‘username‘ value=‘root‘/>
14    <property name=‘password‘ value=‘admin‘/> -->
15    <property name=‘driver‘ value=‘${jdbc.driverClassName}‘/>
16    <property name=‘url‘ value=‘${jdbc.url}‘/>
17    <property name=‘username‘ value=‘${jdbc.username}‘/>
18    <property name=‘password‘ value=‘${jdbc.password}‘/>
19     </dataSource>
20   </environment>
21   </environments>
22   <mappers>
23     <mapper class=‘com.sivalabs.mybatisdemo.mappers.BlogMapper‘/>
24   </mappers>
25 </configuration>

Step#4: Create BlogService.java

01 package com.sivalabs.mybatisdemo.service;
02  
03 import java.util.List;
04  
05 import org.apache.ibatis.session.SqlSession;
06  
07 import com.sivalabs.mybatisdemo.domain.Blog;
08 import com.sivalabs.mybatisdemo.mappers.BlogMapper;
09  
10 public class BlogService
11 {
12  
13  public void insertBlog(Blog blog) {
14   SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
15   try{
16   BlogMapper blogMapper = sqlSession.getMapper(BlogMapper.class);
17   blogMapper.insertBlog(blog);
18   sqlSession.commit();
19   }finally{
20    sqlSession.close();
21   }
22  }
23  
24  public Blog getBlogById(Integer blogId) {
25   SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
26   try{
27   BlogMapper blogMapper = sqlSession.getMapper(BlogMapper.class);
28   return blogMapper.getBlogById(blogId);
29   }finally{
30    sqlSession.close();
31   }
32  }
33  
34  public List<Blog> getAllBlogs() {
35   SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
36   try{
37   BlogMapper blogMapper = sqlSession.getMapper(BlogMapper.class);
38   return blogMapper.getAllBlogs();
39   }finally{
40    sqlSession.close();
41   }
42  }
43  
44  public void updateBlog(Blog blog) {
45   SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
46   try{
47   BlogMapper blogMapper = sqlSession.getMapper(BlogMapper.class);
48   blogMapper.updateBlog(blog);
49   sqlSession.commit();
50   }finally{
51    sqlSession.close();
52   } 
53  }
54  
55  public void deleteBlog(Integer blogId) {
56   SqlSession sqlSession = MyBatisUtil.getSqlSessionFactory().openSession();
57   try{
58   BlogMapper blogMapper = sqlSession.getMapper(BlogMapper.class);
59   blogMapper.deleteBlog(blogId);
60   sqlSession.commit();
61   }finally{
62    sqlSession.close();
63   }
64  
65  }
66  
67 }

Step#5: Create JUnit Test for BlogService methods

01 package com.sivalabs.mybatisdemo;
02  
03 import java.util.Date;
04 import java.util.List;
05  
06 import org.junit.AfterClass;
07 import org.junit.Assert;
08 import org.junit.BeforeClass;
09 import org.junit.Test;
10  
11 import com.sivalabs.mybatisdemo.domain.Blog;
12 import com.sivalabs.mybatisdemo.service.BlogService;
13  
14 public class BlogServiceTest
15 {
16  private static BlogService blogService;
17  
18  @BeforeClass
19     public static void setup()
20  {
21   blogService = new BlogService();
22  }
23  
24  @AfterClass
25     public static void teardown()
26  {
27   blogService = null;
28  }
29  
30     @Test
31  public void testGetBlogById()
32  {
33   Blog blog = blogService.getBlogById(1);
34   Assert.assertNotNull(blog);
35   System.out.println(blog);
36  }
37  
38     @Test
39     public void testGetAllBlogs()
40     {
41   List<Blog> blogs = blogService.getAllBlogs();
42   Assert.assertNotNull(blogs);
43   for (Blog blog : blogs)
44   {
45    System.out.println(blog);
46   }
47  
48  }
49  
50     @Test
51     public void testInsertBlog()
52     {
53      Blog blog = new Blog();
54      blog.setBlogName(‘test_blog_‘+System.currentTimeMillis());
55      blog.setCreatedOn(new Date());
56  
57      blogService.insertBlog(blog);
58   Assert.assertTrue(blog.getBlogId() != 0);
59   Blog createdBlog = blogService.getBlogById(blog.getBlogId());
60   Assert.assertNotNull(createdBlog);
61   Assert.assertEquals(blog.getBlogName(), createdBlog.getBlogName());
62  
63  }
64  
65     @Test
66     public void testUpdateBlog()
67     {
68      long timestamp = System.currentTimeMillis();
69   Blog blog = blogService.getBlogById(2);
70   blog.setBlogName(‘TestBlogName‘+timestamp);
71      blogService.updateBlog(blog);
72   Blog updatedBlog = blogService.getBlogById(2);
73   Assert.assertEquals(blog.getBlogName(), updatedBlog.getBlogName());
74  }
75  
76    @Test
77    public void testDeleteBlog()
78    {
79      Blog blog = blogService.getBlogById(4);
80      blogService.deleteBlog(blog.getBlogId());
81   Blog deletedBlog = blogService.getBlogById(4);
82   Assert.assertNull(deletedBlog);
83  }
84 }
时间： 2024-08-01 12:11:58

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