# MyBatis JPA Extra
   **MyBatis JPA Extra**对MyBatis进行了扩展，目的在于简化开发的难度，采用了JPA 2.1的注释，无需配置映射的XML文件，使用插件的方式动态生成SQL语句，实现对单表的操作的简化；另外使用Interceptor拦截需要分页的SELECT查询语句，根据不同的数据库完成分页查询。

相关资源

[MyBatis网站][1]

[MyBatis GitHub源码][2]


## 1、JavaBean注释简单

只支持4个注释
> * @Table
> * @Id
> * @Column
> * @GeneratedValue

@GeneratedValue有3中策略 

 1. **AUTO**
 
    uuid

    uuid.hex

    serial

 2. **SEQUENCE**
 
    generator值为数据库序列名

 3. **IDENTITY**
 
    generator无，根据数据库自动生成方式


```java
package org.apache.mybatis.jpa.test.domain;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

import org.apache.mybatis.jpa.persistence.JpaBaseDomain;



/*
   ID                   varchar(40)                    not null,
   NAME                 varchar(60)                    not null,
   STATUS               char(1)                        null,
   CREATEBY             varchar(40)                    null,
   CREATEDATE           date                           null,
   UPDATEBY             varchar(40)                    null,
   UPDATEDATE           date                           null,
   constraint PK_ROLES primary key clustered (ID)
 */
/**
 * @author Crystal.Sea
 *
 */
@Table(name = "STUDENTS")  
public class Students extends JpaBaseDomain implements Serializable{
	/**
	 * 
	 */
	private static final long serialVersionUID = -6928570405840778151L;
	
	@Id
	@Column
	@GeneratedValue(strategy=GenerationType.AUTO,generator="serial")
	//@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="SEQ_MYBATIS_STUD")
	//@GeneratedValue(strategy=GenerationType.IDENTITY,generator="SEQ_MYBATIS_STUD")
	private String id;
	@Column
	private String stdNo;
	@Column
	private String stdName;
	@Column
	private String stdGender;
	@Column
	private int stdAge;
	@Column
	private String stdMajor;
	@Column
	private String stdClass;
	
	
	public Students() {
		super();
	}


	public String getStdNo() {
		return stdNo;
	}


	public void setStdNo(String stdNo) {
		this.stdNo = stdNo;
	}


	public String getStdName() {
		return stdName;
	}


	public void setStdName(String stdName) {
		this.stdName = stdName;
	}





	public String getStdGender() {
		return stdGender;
	}


	public void setStdGender(String stdGender) {
		this.stdGender = stdGender;
	}


	public int getStdAge() {
		return stdAge;
	}


	public void setStdAge(int stdAge) {
		this.stdAge = stdAge;
	}


	public String getStdMajor() {
		return stdMajor;
	}


	public void setStdMajor(String stdMajor) {
		this.stdMajor = stdMajor;
	}


	public String getStdClass() {
		return stdClass;
	}


	public void setStdClass(String stdClass) {
		this.stdClass = stdClass;
	}


	public String getId() {
		return id;
	}


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


	@Override
	public String toString() {
		return "Students [stdNo=" + stdNo + ", stdName=" + stdName + ", stdgender=" + stdGender + ", stdAge=" + stdAge
				+ ", stdMajor=" + stdMajor + ", stdClass=" + stdClass + "]";
	}


	
	

}


```

## 2、单表新增、修改、删除、查询

```java
package org.apache.mybatis.jpa.test;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.mybatis.jpa.test.dao.service.StudentsService;
import org.apache.mybatis.jpa.test.domain.Students;
import org.apache.mybatis.jpa.util.WebContext;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class MyBatisTestRunner {
	private static final Logger _logger = LoggerFactory.getLogger(MyBatisTestRunner.class);
	
	public static ApplicationContext context;
	public static StudentsService service;
	
	@Test
	public void insert() throws Exception{
		_logger.info("insert...");
		Students student=new Students();
		student.setStdNo("10024");
		student.setStdGender("M");
		student.setStdName("司马昭");
		student.setStdAge(20);
		student.setStdMajor("政治");
		student.setStdClass("4");
		service.insert(student);
		Thread.sleep(1000);
		service.remove(student.getId());
	}
	
	@Test
	public void get() throws Exception{
		_logger.info("get...");
		Students student=service.get("921d3377-937a-4578-b1e2-92fb23b5e512");
		 _logger.info("Students "+student);

	}
	
	@Test
	public void remove() throws Exception{
		_logger.info("remove...");
		Students student=new Students();
		student.setId("921d3377-937a-4578-b1e2-92fb23b5e512");
		service.remove(student.getId());
		
	}
	
	@Test
	public void batchDelete() throws Exception{
		_logger.info("batchDelete...");
		List<String> idList=new ArrayList<String>();
		idList.add("8584804d-b5ac-45d2-9f91-4dd8e7a090a7");
		idList.add("ab7422e9-a91a-4840-9e59-9d911257c918");
		idList.add("12b6ceb8-573b-4f01-ad85-cfb24cfa007c");
		idList.add("dafd5ba4-d2e3-4656-bd42-178841e610fe");
		service.batchDelete(idList);
	}

	@Test
	public void findAll() throws Exception{
		_logger.info("findAll...");
		_logger.info("findAll "+service.findAll());
	}
	
	@Before
	public void initSpringContext(){
		if(context!=null) return;
		_logger.info("init Spring Context...");
		SimpleDateFormat sdf_ymdhms =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		String startTime=sdf_ymdhms.format(new Date());

		try{
			MyBatisTestRunner runner=new MyBatisTestRunner();
			runner.init();
			
		}catch(Exception e){
			e.printStackTrace();
		}
		
		_logger.info("-- --Init Start at " + startTime+" , End at  "+sdf_ymdhms.format(new Date()));
	}
	
	//Initialization ApplicationContext for Project
	public void init(){
		_logger.info("init ...");
		
		context = new ClassPathXmlApplicationContext(new String[] {"spring/applicationContext.xml"});
		
		WebContext.applicationContext=context;
		service =(StudentsService)WebContext.getBean("studentsService");
	}
	
}
```

## 3、支持分页查询

```java
package org.apache.mybatis.jpa.test;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.mybatis.jpa.test.dao.service.StudentsService;
import org.apache.mybatis.jpa.test.domain.Students;
import org.apache.mybatis.jpa.util.WebContext;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class MyBatisTestRunner {
	
	private static final Logger _logger = LoggerFactory.getLogger(MyBatisTestRunner.class);
	
	public static ApplicationContext context;

	@Test
	public void queryPageResults() throws Exception{
		_logger.info("queryPageResults...");
		 Students student=new Students();
		 //student.setId("af04d610-6092-481e-9558-30bd63ef783c");
		 student.setStdGender("M");
		 //student.setStdMajor(政治");
		 student.setPageResults(10);
		 student.setPage(2);
		 _logger.info("queryPageResults "+service.queryPageResults(student));
	}
	
	@Test
	public void queryPageResultsByMapperId() throws Exception{
		_logger.info("queryPageResults by mapperId...");
		 Students student=new Students();
		 student.setStdGender("M");
		 //student.setStdMajor(政治");
		 student.setPageResults(10);
		 student.setPage(2);
		 _logger.info("queryPageResults by mapperId "+service.queryPageResults("queryPageResults1",student));
		 
	}

	@Before
	public void initSpringContext(){
		if(context!=null) return;
		_logger.info("init Spring Context...");
		SimpleDateFormat sdf_ymdhms =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		String startTime=sdf_ymdhms.format(new Date());

		try{
			MyBatisTestRunner runner=new MyBatisTestRunner();
			runner.init();
			
		}catch(Exception e){
			e.printStackTrace();
		}
		
		_logger.info("-- --Init Start at " + startTime+" , End at  "+sdf_ymdhms.format(new Date()));
	}
	
	//Initialization ApplicationContext for Project
	public void init(){
		_logger.info("init ...");
		context = new ClassPathXmlApplicationContext(new String[] {"spring/applicationContext.xml"});
		WebContext.applicationContext=context;
		service =(StudentsService)WebContext.getBean("studentsService");
	}
	
}
```


## 4、映射文件配置

```xml
<mapper namespace="org.apache.mybatis.jpa.test.dao.persistence.StudentsMapper" >
	<sql id="sql_condition">
		WHERE	1	=	1
    	<if test="id != null">
			AND	ID	=	'${id}'
		</if>
		<if test="stdName != null  and stdName != '' ">
			AND STDNAME like '%${stdName}%'
		</if>
		<if test="stdGender != null  and stdGender != '' ">
			AND	STDGENDER	=	#{stdGender}
		</if>
		<if test="stdMajor != null">
			<![CDATA[AND	STDMAJOR	= #{stdMajor}]]>
		</if>
	</sql>
	
    <select id="queryPageResults" parameterType="Students" resultType="Students">
    	SELECT 
    		ID		   ,
			STDNO      ,
			STDNAME    ,
			STDGENDER  ,
			STDAGE     ,
			STDMAJOR   ,
			STDCLASS 
    	FROM STUDENTS 
    	<include refid="sql_condition"/>
    </select>
 
     <select id="queryPageResults1" parameterType="Students" resultType="Students">
    	SELECT 
    		ID		   ,
			STDNO      ,
			STDNAME    ,
			STDGENDER  ,
			STDAGE     ,
			STDMAJOR   ,
			STDCLASS 
    	FROM STUDENTS 
    	<include refid="sql_condition"/>
    </select>
       
     <select id="queryBy" parameterType="Students" resultType="Students">
    	SELECT 
    		ID		   ,
			STDNO      ,
			STDNAME    ,
			STDGENDER  ,
			STDAGE     ,
			STDMAJOR   ,
			STDCLASS 
    	FROM ROLES 
    	<include refid="sql_condition"/>
    </select>
  
    <delete id="delete" parameterType="Students" >
    	DELETE FROM STUDENTS WHERE ID=#{id}
    </delete>
    
```


##  5、Spring XML配置

```xml
  <tx:annotation-driven transaction-manager="txManager" />

  <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource" />
  </bean>

    <!-- enable autowire -->
    <context:annotation-config />

    <!-- enable transaction demarcation with annotations 
    <tx:annotation-driven />-->

	<!--<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">-->
	<bean id="sqlSessionFactory" class="org.apache.mybatis.jpa.MyBatisSessionFactoryBean">
		<property name="timeout" value="30" />
		<property name="dataSource" ref="dataSource" />
		<property name="mapperLocations" value="classpath*:/org/apache/mybatis/jpa/test/dao/persistence/xml/mysql/*.xml" />
		<property name="typeAliasesPackage" 
        		  value="
	        			org.apache.mybatis.jpa.test.domain,
        			" />
		<property name="transactionFactory">
			<bean class="org.apache.ibatis.transaction.managed.ManagedTransactionFactory" />
		</property>
		<property name="interceptors">
			<list>
					<bean class="org.apache.mybatis.jpa.StatementHandlerInterceptor">
						<property name="dialectString" value="org.apache.mybatis.jpa.dialect.MySQLDialect"/>
					</bean>
			</list>
		</property>
	</bean>

    <!-- scan for mappers and let them be autowired -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" 
        		  value="
        		  		org.apache.mybatis.jpa.test.dao.persistence,
        		  		" />
    </bean>

 	<!-- enable component scanning (beware that this does not enable mapper scanning!) -->    
    <context:component-scan base-package="org.apache.mybatis.jpa.test.dao.service" />
    
    <bean class ="org.apache.mybatis.jpa.id.IdentifierGeneratorFactory">
	    <property name="generatorStrategyMap" >
	    	<map>
		        <entry key="serial" >
		        	<bean class="org.apache.mybatis.jpa.id.SerialGenerator">
		        		<property name="ipAddressNodeValue"  value="F0-76-1C-B0-26-9C=02,"/>
		        	</bean></entry>
		    </map>
	    </property>
    </bean>
    
   	<!-- 
	<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
		<constructor-arg index="0" ref="sqlSessionFactory" />
	</bean>
	 -->
```


  [1]: http://www.mybatis.org/mybatis-3/
  [2]: https://github.com/mybatis/mybatis-3/
  [3]: http://shimingxy.blog.163.com/