README.md

    MyBatis JPA Extra

    MyBatis JPA Extra对MyBatis扩展JPA功能

    1.基于JPA 2.1的注释简化CUID操作;

    2.用Interceptor实现数据库SELECT分页查询;

    3.提供mybatis-jpa-extra-spring-boot-starter,简化SpringBoot集成;

    1、JavaBean注释简单

    仅有6个注释

    • @Entity
    • @table
    • @Column
    • @Id
    • @GeneratedValue
    • @Transient

    @GeneratedValue有4中策略

    1. AUTO

      snowflakeid

      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

    package org.apache.mybatis.jpa.test.entity;
    
    import java.io.Serializable;
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.GenerationType;
    import javax.persistence.Id;
    import javax.persistence.Table;
    import org.apache.mybatis.jpa.persistence.JpaBaseEntity;
    
    @Entity
    @Table(name = "STUDENTS")  
    public class Students extends JpaBaseEntity implements Serializable{
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = -6928570405840778151L;
    	
    	@Id
    	@Column
    	@GeneratedValue(strategy=GenerationType.AUTO,generator="snowflakeid")
    	//@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;
    	
    	@Column
    	private byte[] images;
    	
    	
    	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;
    	}
    
    
    	public byte[] getImages() {
    		return images;
    	}
    
    
    	public void setImages(byte[] images) {
    		this.images = images;
    	}
    
    }
    
    

    2、单表新增、修改、删除、查询、分页查询

    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.entity.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.setId("10024");
    		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);
    		_logger.info("insert id " + student.getId());
    		//service.remove(student.getId());
    		
    	}
    	
    	
    	@Test
    	public void merge() throws Exception{
    		_logger.info("merge...");
    		Students student=new Students();
    		//student.setId("10024");
    		student.setStdNo("10024");
    		student.setStdGender("M");
    		student.setStdName("司马昭");
    		student.setStdAge(20);
    		student.setStdMajor("政治");
    		student.setStdClass("4");
    		service.merge(student);
    		
    		Thread.sleep(1000);
    		_logger.info("insert id " + student.getId());
    		//service.remove(student.getId());
    		
    	}
    	
    	@Test
    	public void get() throws Exception{
    		_logger.info("get...");
    		Students student=service.get("317d5eda-927c-4871-a916-472a8062df23");
    		
    		System.out.println("Students "+student);
    		 _logger.info("Students "+student);
    	}
    	
    	@Test
    	public void update() throws Exception{
    		_logger.info("get...");
    		Students student=service.get("317d5eda-927c-4871-a916-472a8062df23");
    		System.out.println("Students "+student);
    		 _logger.info("Students "+student);
    		 
    		 _logger.info("update...");
    		 student.setImages(null);
    		 service.update(student);
    		 _logger.info("updateed.");
    		 
    		 student.setImages("ssss".getBytes());
    		 service.update(student);
    		 _logger.info("updateed2.");
    	}
    	
    	
    	@Test
    	public void find() throws Exception{
    		_logger.info("find...");
    		Students student=service.find(Students.class,"317d5eda-927c-4871-a916-472a8062df23");
    		
    		System.out.println("Students "+student);
    		 _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 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.setPageSize(10);
    		 student.setPageNumber(1);
    		 List<Students> allListStudents = 
    				 service.queryPageResults(student).getRows();
    		 for (Students s : allListStudents) {
    			 _logger.info("Students "+s);
    		 }
    	}
    	
    	@Test
    	public void queryPageResultsByMapperId() throws Exception{
    
    		_logger.info("queryPageResults by mapperId...");
    		 Students student=new Students();
    		 student.setStdGender("M");
    		 //student.setStdMajor(政治");
    		 student.setPageSize(10);
    		 student.setPageNumber(2);
    		 
    		 List<Students> allListStudents = 
    				 service.queryPageResults("queryPageResults1",student).getRows();
    		 for (Students s : allListStudents) {
    			 _logger.info("Students "+s);
    		 }
    		 
    	}
    	
    	
    	
    	@Test
    	public void findAll() throws Exception{
    		_logger.info("findAll...");
    		List<Students> allListStudents =service.findAll();
    		 for (Students s : allListStudents) {
    			 _logger.info("Students "+s);
    		 }
    	}
    	
    	@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("Application dir "+System.getProperty("user.dir"));
    		context = new ClassPathXmlApplicationContext(new String[] {"spring/applicationContext.xml"});
    		
    		WebContext.applicationContext=context;
    		service =(StudentsService)WebContext.getBean("studentsService");
    		
    	}
    	
    }
    

    3、映射文件配置

    <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>
        

    4、SpringBoot配置

    #
    spring.datasource.username=root
    spring.datasource.password=maxkey
    spring.datasource.url=jdbc:mysql://localhost/test?autoReconnect=true&characterEncoding=UTF-8&serverTimezone=UTC
    spring.datasource.driver-class-name=com.mysql.jdbc.Driver
    spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
    
    mybatis.dialect=mysql
    mybatis.type-aliases-package=org.apache.mybatis.jpa.test.entity
    mybatis.mapper-locations=classpath*:/org/apache/mybatis/jpa/test/dao/persistence/xml/${mybatis.dialect}/*.xml
    mybatis.table-column-escape=true
    mybatis.table-column-snowflake-datacenter-id=1
    mybatis.table-column-snowflake-machine-id=1
    #mybatis.table-column-escape-char=`

    5、相关资源

    MyBatis网站

    MyBatis GitHub源码

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