MyBatis简单应用

 环境及软件：

MyEclipse 8,5 & mysql5.1 & jdk 1.6 

jar包：

mybatis-3.0.3.jar(可在网上下载http://code.google.com/p/mybatis/)

mysql-connector-java-5.1.6-bin.jar

 

配置文件：

db.properties：见ibatis简单应用

Configuration.xml：<?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>
	<properties resource="db.properties"/>
	<typeAliases>  
        <typeAlias type="Test" alias="Test"/>  
    </typeAliases> 
	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC" />
			<dataSource type="UNPOOLED">
				<property name="driver" value="${driver}" />
				<property name="url" value="${url}" />
				<property name="username" value="${username}" />
				<property name="password" value="${password}" />
			</dataSource>
		</environment>
	</environments>
	<mappers>
		<!-- sql映射文件 -->
		<mapper resource="Test.xml" />
	</mappers>
</configuration> 

 JavaBean：

见ibatis简单应用

 

JavaBean相应的sql映射文件：

Test.xml<?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="com.ontheway.mybatis">
	<select id="selectAll" resultType="Test">
		select * from test
	</select>
	<select parameterType="int" id="selectTestById" resultType="Test">
		select * from test where id=#{id}
	</select>
	<insert id="add" parameterType="test">
		insert into test(id,name)
		values(#{id},#{name})
	</insert>
	<update id="update" parameterType="Test">
		update test set name=#{name}
		where id=#{id}
	</update>
	<select id="fuzzyRetrieve" parameterType="String" resultType="Test">
		select * from test where name like #{name}
	</select>
	<delete id="delete" parameterType="int">
		delete from test where
		id=#{id}
	</delete>
</mapper>

 工具类：import java.io.IOException;

import java.io.Reader;


import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class SqlSessionFactoryUtil {
	private static SqlSessionFactory sqlSessionFactory = null;  
	static {  
		String resource = "Configuration.xml";  
		try {  
			Reader reader = Resources.getResourceAsReader(resource);  
			sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);  
		} catch (IOException e) {  
			e.printStackTrace();  
		}  
	}  

	public static SqlSessionFactory getSqlSessionFactory() {  
		return sqlSessionFactory;  
	}  

	public static SqlSession getSqlSession() {  
		return sqlSessionFactory.openSession();  
	}  

	public static void closeSession(SqlSession sqlSession) {  
		if(sqlSession != null) {  
			sqlSession.close();  
		}  
	}  
}

 接口：import java.util.List;

public interface TestDao {
	public void add(Test test);
	public void delete(int id);
	public void update(Test test);
	public List<Test>query();
	public List<Test> query(String name);
	public Test query(int id);
}

 

接口实现类：

import java.util.List;
import org.apache.ibatis.session.SqlSession;

public class ITestDaoImpl implements TestDao {
	public void add(Test test){
		SqlSession session = SqlSessionFactoryUtil.getSqlSession();
		try{
			session.insert("com.ontheway.mybatis.add",test);
			session.commit();
		}catch(Exception e){
			e.printStackTrace();
			session.rollback();
		}finally{
			SqlSessionFactoryUtil.closeSession(session); 
		}
	}

	public void delete(int id){
		SqlSession session = SqlSessionFactoryUtil.getSqlSession();
		try{
			session.delete("com.ontheway.mybatis.delete",id);
			session.commit();
		}catch(Exception e){
			e.printStackTrace();
			session.rollback();
		}finally{
			SqlSessionFactoryUtil.closeSession(session); 
		}
	}

	@SuppressWarnings("unchecked")
	public List<Test> query(){

		SqlSession session = SqlSessionFactoryUtil.getSqlSession();
		List<Test>list = null;
		try{
			list = session.selectList("com.ontheway.mybatis.selectAll");

		}catch(Exception e){
			e.printStackTrace();
		}finally{
			SqlSessionFactoryUtil.closeSession(session); 
		}
		return list;
	}

	@SuppressWarnings("unchecked")
	public List<Test> query(String name){

		SqlSession session = SqlSessionFactoryUtil.getSqlSession();
		List<Test>list = null;
		try{
			list = session.selectList("com.ontheway.mybatis.fuzzyRetrieve", name);

		}catch(Exception e){
			e.printStackTrace();
		}finally{
			SqlSessionFactoryUtil.closeSession(session); 
		}
		return list;
	}

	public Test query(int id){

		SqlSession session = SqlSessionFactoryUtil.getSqlSession();
		Test test = null;
		try{
			test = (Test)session.selectOne("com.ontheway.mybatis.selectTestById", id);
		}catch(Exception e){
			e.printStackTrace();
		}finally{
			SqlSessionFactoryUtil.closeSession(session); 
		}
		return test;
	}

	public void update(Test test){

		SqlSession session = SqlSessionFactoryUtil.getSqlSession();
		try{
			session.update("com.ontheway.mybatis.update", test);
			session.commit();
		}catch(Exception e){
			e.printStackTrace();
			session.rollback();
		}finally{
			SqlSessionFactoryUtil.closeSession(session); 
		}
	}

 现在的MyBatis即就是以前的ibatis，并且现在的写法和hibernate很相似的

sql语句还是自己写

没有类映射文件

这里只是列举了xml文件方式，还可以使用注解方式，只是如果sql比较复杂的话，建议使用配置文件方式