一个简单的MyBatisDemo

首先写一个连接数据库的XML文件，想要连接oracle数据库的话，jdbc驱动需要ojdbc6以上

<?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">

				<!--向java程序注册Oracle JDBC驱动程序-->
				<property name="driver"
					value="oracle.jdbc.driver.OracleDriver" />

				<!-- 配置数据库地址-->
				<property name="url"
					value="jdbc:oracle:thin:@192.168.43.58:1521:SID" />
					<!-- 用户名 -->
				<property name="username" value="xxxxxx" />
				<!-- 用户密码 -->
				<property name="password" value="xxxxxxxxxx" />
			</dataSource>
		</environment>
	</environments>
	
<!-- 映射文件 -->
<mappers>
		<mapper resource="com/probie/operate.xml"></mapper>
</mappers>
</configuration>

数据库连接上了，接下来的当然就是对数据库进行操作了。我们需要在XML文件中写SQL语句

<?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.probie.operate">
	<select id="select" resultType="com.probie.Goods">
		select * from goods
	</select>
</mapper>

namespace+id的值用来标识具体的某个对数据库的操作

resultType : 用来封装返回的数据，它的值是一个类的路径。下面的就是这个类

package com.probie;

public class Goods {
	private int id;
	private String name;
	private int num;
	private int price;
	
	
	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;
	}
	public int getNum() {
		return num;
	}
	public void setNum(int num) {
		this.num = num;
	}
	public int getPrice() {
		return price;
	}
	public void setPrice(int price) {
		this.price = price;
	}
	
	
}

package com.probie;

import java.io.IOException;
import java.io.InputStream;
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 Test {
	public static void main(String[] args) {
		SqlSession session;
		try {
			InputStream inputStream = Resources.getResourceAsStream("com/probie/database.xml");
			SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
			session = factory.openSession();
			//System.out.println(session);
			List<Goods> list = session.selectList("com.probie.operate.select");
			for (int i = 0; i < list.size(); i++) {
				Goods goods = list.get(i);
				System.out.println(goods.getId()+"   "
				+goods.getName()+"  "+goods.getNum()+"  "+goods.getPrice());
			}
		
		
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		
	}
}