iBatis3 Note（二） : 初识Hello World

和学习所有框架API一样，有个HelloWorld的例子

本着1+1=2学习的逻辑，以下继续对iBatis3做一些简单实现

 

熟悉Hibernate的都知道如下几步

/**
   *  1.  create Configuration
   *  2.  build SessionFactory
   *  3.  open Session
   *  4.  begin Transaction
   *  5.  do crud operation
   *       flush commit rollback
   *  6.  close resource
   */

 

 

 而iBatis3会有如下几步

 

/**
 *  1.  create SqlSessionFactoryBuilder
 *  2.  read config file
 *  3.  build Factory
 *  4.  open session
 *  5.  do crud operations
 *  6.  close session
 */

 

第一个实现Hello World，

 

先看下文件结构

 

 

既然是iBatis，首先创建脚本，用的是mysql

DROP TABLE IF EXISTS `ibatis`.`t_helloworld`;
CREATE TABLE  `ibatis`.`t_helloworld` (
  `hw_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(45) NOT NULL,
  `age` int(2) unsigned NOT NULL,
  PRIMARY KEY (`hw_id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

 

 数据如下

 

 

 

同时关注几个文件

1. ibatis-config.xml
2. config.properties
3. helloworld.map.xml

 

1. ibatis-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//ibatis.apache.org//DTD Config 3.0//EN" "http://ibatis.apache.org/dtd/ibatis-3-config.dtd">
<configuration>
	<!-- 数据库配置文件 -->
	<properties resource="basic/config.properties"/>
	<!-- default属性一定要指定为其中某一environment的id -->
	<environments default="helloworld">
		<environment id="helloworld">
			<!-- type暂时用最简单的JDBC，其他可选项MANAGED -->
			<transactionManager type="JDBC" />
			<!-- type暂时用最简单的POOLED，其他可选项UNPOOLED,JNDI -->
			<dataSource type="POOLED">
				<property name="driver"   value="${driver}"/>
				<property name="url"      value="${url}"/>
				<property name="username" value="${username}"/>
				<property name="password" value="${password}"/>
				
				<!-- property name="driver"   value="com.mysql.jdbc.Driver"/>
				<property name="url"      value="jdbc:mysql://localhost:3306/ibatis"/>
				<property name="username" value="root"/>
				<property name="password" value="abcdef"/ -->
			</dataSource>
		</environment>
	</environments>
	<!-- 映射文件 -->
	<mappers>
		<mapper resource="basic/helloworld.map.xml"/>
	</mappers>
</configuration>

 

 

     2.   config.properties

driver=com.mysql.jdbc.Driver
url=jdbc\:mysql\://localhost\:3306/ibatis
username=root
password=abcdef

 

    3.   helloworld.map.xml

 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD iBatis Mapper 3.0 //EN" "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">
<mapper namespace="basic.HelloWorld">
	<select id="getHelloworlds" resultType="java.util.List">
		select * from t_helloworld
	</select>
	<select id="getHelloworldsByHwId" resultType="java.util.List" parameterType="int">
		select * from t_helloworld where hw_id = #{hw_id}
	</select>
</mapper>

 

 

FirstTest.java

package basic;

import java.io.IOException;
import java.io.Reader;
import java.util.List;

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 FirstTest {
	
	public static void main(String[] args) throws IOException {
		String configXml = "basic/ibatis-config.xml";
		SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
		Reader config = Resources.getResourceAsReader(configXml);
		SqlSessionFactory factory = builder.build(config);
		SqlSession session = factory.openSession();
		
		List<HelloWorld> list = null;
		try {
			list = session.selectList("getHelloworlds");
			System.out.println(list.size());
			
			list = session.selectList("getHelloworldsByHwId", 1);
			System.out.println(list.size());
		} finally {
			session.close();
		}
	}
	
}