MyBatis 学习 - 注解

 

首先，POJO

/**
 * @Title: Question.java
 * @Package com.test.model
 * @Description: TODO(POJO Question)
 * Copyright: Copyright (c) 2012 Company China Foreign Exchange Trade System and National Interbank Funding Center.
 * Building 24,1387 ZhangDong Road, Shanghai, China.
 * All Rights Reserved. 
 * Company: Insigma HT
 * @author Ares
 * @date 2013-06-24 下午3:48:31
 *
 * Revision History
 *
 * Date            Programmer              Notes
 * ---------    ---------------------  --------------------------------------------
 * 2013-06-24         Ares                    initial
 */
package com.test.model;

import java.util.Date;

/** 
 * 
 * @author Ares
 * @Describe TODO(POJO Question)
 * 
 */
public class Question {

    private String id;
    private int qorder;
    private String qname;
    private String qcontent;
    private Date updateTime;
    
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public int getQorder() {
        return qorder;
    }
    public void setQorder(int qorder) {
        this.qorder = qorder;
    }
    public String getQname() {
        return qname;
    }
    public void setQname(String qname) {
        this.qname = qname;
    }
    public String getQcontent() {
        return qcontent;
    }
    public void setQcontent(String qcontent) {
        this.qcontent = qcontent;
    }
    public Date getUpdateTime() {
        return updateTime;
    }
    public void setUpdateTime(Date updateTime) {
        this.updateTime = updateTime;
    }
    
}

 

继续，Mapper

/**
 * @Title: QuestionDAO.java
 * @Package com.test.dao
 * @Description: TODO(Question Mapper)
 * Copyright: Copyright (c) 2012 Company China Foreign Exchange Trade System and National Interbank Funding Center.
 * Building 24,1387 ZhangDong Road, Shanghai, China.
 * All Rights Reserved. 
 * Company: Insigma HT
 * @author Ares
 * @date 2013-06-24 下午3:48:31
 *
 * Revision History
 *
 * Date            Programmer              Notes
 * ---------    ---------------------  --------------------------------------------
 * 2013-06-24         Ares                    initial
 */
package com.test.dao;

import java.util.List;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.InsertProvider;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import com.test.model.Question;

/** 
 * 
 * @author Ares
 * @Describe TODO(Question Mapper)
 * 
 */
public interface QuestionDAO {
    
    /**
     * AddBy Ares
     * TODO(find all questions)
     */
    @Select("SELECT * FROM Question")
    public List<Question> findAll();
    
    /**
     * AddBy Ares
     * TODO(find question by ID)
     */
    @Select("SELECT * FROM Question WHERE ID = #{id}")
    public Question findByID(@Param("id")String id);
    
    /**
     * AddBy Ares
     * TODO(just save one question)
     */
    @Insert("INSERT INTO Question VALUES(#{id},#{qorder},#{qname},#{qcontent},#{updateTime})")
    public void save(Question question);
    
    /**
     * AddBy Ares
     * TODO(save all questions in list)
     */
    @InsertProvider(type=SqlProvider.class, method="saveAll")
    public void saveAll(List<Question> list);
    
}

上面的Mapper中，saveAll方法使用了SqlProvider，这个是用作批量添加使用的。

/**
 * @Title: SqlProvider.java
 * @Package com.test.dao
 * @Description: TODO(SqlProvider)
 * Copyright: Copyright (c) 2012 Company China Foreign Exchange Trade System and National Interbank Funding Center.
 * Building 24,1387 ZhangDong Road, Shanghai, China.
 * All Rights Reserved. 
 * Company: Insigma HT
 * @author Ares
 * @date 2013-6-24 下午3:48:31
 *
 * Revision History
 *
 * Date            Programmer              Notes
 * ---------    ---------------------  --------------------------------------------
 * 2013-6-24       Ares                    initial
 */
package com.test.dao;

import java.text.MessageFormat;
import java.util.List;
import java.util.Map;

import com.test.model.Question;

/**
 * @author Ares
 * TODO(SqlProvider)
 */
public class SqlProvider {
    
    private static final String TABLE = "question";

    public String saveAll(Map<String, List<Question>> params){
        List<Question> list = (List<Question>)params.get("list");
        if(list!=null){
            StringBuffer sb = new StringBuffer("insert into ").append(TABLE).append(" values ");
            MessageFormat mf = new MessageFormat("(#'{'list[{0}].id}, #'{'list[{0}].qorder}, #'{'list[{0}].qname}, #'{'list[{0}].qcontent}, #'{'list[{0}].updateTime})");
            for (int i=0; i<list.size(); i++) {
                sb.append(mf.format(new Object[]{i}));  
                if (i < list.size() - 1) {  
                    sb.append(",");  
                }  
            }
            System.out.println(sb.toString());
            return sb.toString();
        }
        return null;
    }
    
}

接下来，把配置文件拿过来，

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
    "mybatis-3-config.dtd">

<configuration>

    <typeAliases>
        <package name="com.test.model"/>
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="jdbc" />
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true"/>
                <property name="username" value="root"/>
                <property name="password" value="test"/>
            </dataSource>
        </environment>
    </environments>
    
    <mappers>
        <package name="com.test.dao"/>
    </mappers>
    <!-- 
    <mappers>
        <mapper resource="com/test/model/Question.xml"/>
    </mappers>
     -->
</configuration>

最后，开始测试

/**
 * @Title: MyBatisTest.java
 * @Package com.test.test
 * @Description: TODO(MyBatisTest)
 * Copyright: Copyright (c) 2012 Company China Foreign Exchange Trade System and National Interbank Funding Center.
 * Building 24,1387 ZhangDong Road, Shanghai, China.
 * All Rights Reserved. 
 * Company: Insigma HT
 * @author Ares
 * @date 2013-06-24 下午3:48:31
 *
 * Revision History
 *
 * Date            Programmer              Notes
 * ---------    ---------------------  --------------------------------------------
 * 2013-06-24       Ares                    initial
 */
package com.test.test;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import com.test.dao.QuestionDAO;
import com.test.model.Question;

/**
 * @author Ares
 * TODO(MyBatisTest)
 */
public class MyBatisTest {

    @Test
    public void testMyBatis(){
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(this.getClass().getResourceAsStream("/com/test/cfg/sqlMapClient.xml"));
        SqlSession sqlSession = sqlSessionFactory.openSession();
        QuestionDAO questionDao = sqlSession.getMapper(QuestionDAO.class);
        
        List<Question> list = new ArrayList<Question>();
        Question q = new Question();
        q.setId(UUID.randomUUID().toString());
        q.setQname("Are you ok?");
        q.setQcontent("I'm ok.");
        q.setQorder(6);
        q.setUpdateTime(new Date());
        list.add(q);
        
        Question q2 = new Question();
        q2.setId(UUID.randomUUID().toString());
        q2.setQname("How are you?");
        q2.setQcontent("I'm ok.");
        q2.setQorder(6);
        q2.setUpdateTime(new Date());
        list.add(q2);
        
        questionDao.saveAll(list);
        sqlSession.commit();
        
        List<Question> questions = questionDao.findAll();
        for (Question question : questions) {
            System.out.println(question.getQname() + " \tReply: "+question.getQcontent());
        }
        
        sqlSession.close();
    }
}