MyBitis(iBitis)系列随笔之一：MyBitis入门实例

MyBits前身是iBitis,相对于Hibernate而言,它是半自动化ORM框架。本着分享和学习的目的，笔者将陆续把学习笔记与代码贴出，希望对想学习mybitis的同窗们有所帮助。
鉴于我的测试数据库是mysql，同仁们现在把mysql装好，然后准备好mysql驱动以及从官网上下载mybitis(http://code.google.com/p/mybatis/)。我下载的是最新的mybatis-3.2.2.zip。

创建数据库test

然后创建表t_user

DROP TABLE IF EXISTS `t_user`;
CREATE TABLE `t_user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(20) DEFAULT NULL,
`pass` varchar(20) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=24 DEFAULT CHARSET=gbk;
INSERT INTO `t_user` VALUES ('1', 'ssssssssssssssss', 'ddsssssssdd');

然后创建与表对应的Java bean对象

<span style="color:#000000;">package com.jefry;
public class User {
private int id;
private String name;
private String pass;
public String getPass() {
return pass;
}
public void setPass(String pass) {
this.pass = pass;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}</span>

接下来，在classpath目录下面创建与配置mybatis-config.xml文件

内容如下：

<?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>
<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://127.0.0.1:3306/test"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/jefry/UserMapper.xml"/>
</mappers>
</configuration>

通过mybatis-config.xml中<mapper resource="com/jefry/UserMapper.xml"/>配置项，我们在包com.jefry下面创建文件UserMapper.xml
内容如下：

<?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="User">
<select id="selectUser" parameterType="int" resultType="com.jefry.User">
select * from t_user where id = #{id}
</select>
</mapper>

编写测试代码

package com.jefry;
import java.io.IOException;
import java.io.InputStream;
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 Test {
static String resource = "mybatis-config.xml";
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession session = sqlSessionFactory.openSession();
try {
//User.selectUser中User对应UserMapper.xml文件中标签<mapper namespace="User"> namespace的值
//selectUser 对应UserMapper.xml文件中标签<select id="selectUser" parameterType="int" resultType="com.jefry.User">中id值
User user = session.selectOne("User.selectUser", 1);
System.out.println("user.getName()=" + user.getName());
} finally {
session.close();
}
}
}

通过运行就可以结果：user.getName()=ssssssssssssssss

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MyBitis(iBitis)系列随笔之一：MyBitis入门实例

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