mybatis入门

Posted 2020-09-20 奋斗的少年WH

1、导入jar包

2、导入配置文件

3、编写测试类

	//mybatis快速入门
	@Test
	public void test00() throws IOException{
		InputStream in = Resources.getResourceAsStream("mybatis.xml");
		SqlSessionFactory ssf=new SqlSessionFactoryBuilder().build(in);
		SqlSession ss=ssf.openSession();
		String string = ss.toString();
		System.out.println(string); 
	}

4、为方便而写的单例模式的测试类

package com.wh.mapperImpl;
/**
 * 将mybatis中事务管理这一块，用单例模式实现
 */
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 BaseDao {

	private static SqlSessionFactory ssf;
	public SqlSession ss;

	static {
		String resource = "mybatis.xml";
		try {
			// 读取配置文件
			InputStream in = Resources.getResourceAsStream(resource);
			// 创建连接工厂
			ssf = new SqlSessionFactoryBuilder().build(in);
		}
		catch (IOException e) {
			e.printStackTrace();
		}
	}

	// 获得连接
	public SqlSession openSession() {
		if (ss == null) {
			// 事务自动提交，默认是false不自动提交   true自动提交
			ss = ssf.openSession(true);
		}
		return ss;
	}

	// 提交
	public void commit() {
		if (ss != null) {
			ss.commit();
		}
	}

	// 回滚
	public void rollback() {
		if (ss != null) {
			ss.rollback();
		}
	}

	// 关闭连接
	public void close() {
		if (ss != null) {
			ss.close();
		}
	}
}

	//mybatis快速入门
	@Test
	public void test() throws IOException{
		//获得连接
		SqlSession ss=BaseDao.openSession();
		String string = ss.toString();
		System.out.println(string);
	}