2011年6月iBatis 更名为 MyBatis，从 iBatis 到 MyBatis，不只是名称上的变化，MyBatis 提供了更为强大的功能，同时并没有损失其易用性，相反，在很多地方都借助于 JDK 的泛型和注解特性进行了简化。所以你懂的，开始学习就从MyBatis吧．
例子使用MyBatis+Oracle实现一个用户表的查询，如下：
①数据库 在MySQL中，test数据库下，简历user表，字段：iid，ifullname，ipassword，建表语句略。
②需导入的包 只有两个： mybatis-3.4.4.jar 和 ojdbc14.jar（JDBC包）
③目录结构 采用最简单的结构，com.mybatis包下有且仅有四个文件 configuration.xml user.xml User.java Test.java
④mybatis配置文件configuration.xml，
[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>
<typeAliases>
<typeAlias alias="User" type="com.mybatis.User"></typeAlias>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"></transactionManager>
<dataSource type="POOLED">
<property name="driver" value="oracle.jdbc.driver.OracleDriver" />
<property name="url" value="jdbc:oracle:thin:@192.168.0.87:1526:entegor" />
<property name="username" value="ideal" />
<property name="password" value="ideal" />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="user.xml"/>
</mappers>
</configuration>
User表sql文件User.xml，
[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="User">
<select id="selectUser" parameterType="int" resultType="User">
SELECT * FROM user WHERE id = #{id}
</select>
<select id="selectUsers" resultType="User">
SELECT * FROM user
</select>
</mapper>
表结构文件User.java
package com.mybatis;
public class User {
private int iid;
private String ifullname;
private String iloginname;
private String ipassword;
public User(){}
public User(int id, String name) {
this.iid = id;
this.ifullname = name;
}
public String getIfullname() {
return ifullname;
}
public int getIid() {
return iid;
}
public void setIid(int iid) {
this.iid = iid;
}
public void setIfullname(String ifullname) {
this.ifullname = ifullname;
}
public String getIloginname() {
return iloginname;
}
public void setIloginname(String iloginname) {
this.iloginname = iloginname;
}
public String getIpassword() {
return ipassword;
}
public void setIpassword(String ipassword) {
this.ipassword = ipassword;
}
}
⑦测试用例Test.java
package com.controller;
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;
import com.mybatis.User;
public class Test {
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
String resource = "configuration.xml";
Reader reader = Resources.getResourceAsReader(resource);
SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader);
SqlSession session = ssf.openSession();
try{
User user = session.selectOne("selectUser", 2);
System.out.println(user.getIfullname());
System.out.println(user);
System.out.println("--------------分隔线---------------");
List<User> users = session.selectList("selectUsers");
for(int i=0; i<users.size(); i++) {
System.out.println(users.get(i).getIfullname());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
}
}
