Mybatis连接工具类MybatisUtils,封装SQLSession的创建和关闭！

总结一下工具类备用：

MybatisUtil：

package com.macw.util;

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 MyBatisUtils {
	private static SqlSessionFactory factory = null;
	private static ThreadLocal tl = new ThreadLocal();
	static {
		// 1 读取配置文件 config.xml
		InputStream in = null;
		try {
			in = Resources.getResourceAsStream("mybatis-config.xml");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			throw new RuntimeException(e);
		}
		// 2 创建SqlSessionFactory
		factory = new SqlSessionFactoryBuilder().build(in);
	}

	public static SqlSession openSession() {
		// 3 创建SqlSession
		SqlSession sqlSession = tl.get();
		if (sqlSession == null) {
			sqlSession = factory.openSession();
			tl.set(sqlSession);
		}
		return sqlSession;

	}

	public static void close(SqlSession sqlSession) {

		if (sqlSession != null) {
			tl.remove();
			sqlSession.close();
		}

	}
}

所用到的mybatis-config.xml文件：

上面xml所用到的druid.properties文件：
连接Oracle数据库的配置文件

DriverClassName=oracle.jdbc.OracleDriver
url=jdbc:oracle:thin:@localhost:1521:xe
username=macw
password=macw
initialSize=10
maxActive=50
maxWait=60000

Mybatis工具类在ServiceImpl类下的使用：

package com.macw.service.impl;

import java.util.List;

import org.apache.ibatis.session.SqlSession;

import com.macw.dao.OrderDao;
import com.macw.entity.Order;
import com.macw.service.OrderService;
import com.macw.util.MyBatisUtils;

/**
 * @author 超伟
 * @2019年7月16日 上午10:41:20
 * @博客：https://blog.csdn.net/MacWx
 */
public class OrderServiceImpl implements OrderService {
	private OrderDao dao; 
	/* (non-Javadoc)
	 * @see com.macw.service.OrderService#insertOrder(com.macw.entity.Order)
	 */
	@Override
	public void insertOrder(Order order) {
		// TODO Auto-generated method stub
		SqlSession sqlSession = MyBatisUtils.openSession();
		dao = sqlSession.getMapper(OrderDao.class);
		try {
			dao.insertOrder(order);
			sqlSession.commit();
		} catch (Exception e) {
			// TODO: handle exception
			sqlSession.rollback();
		} finally {
			MyBatisUtils.close(sqlSession);
		}
	}
}

log4j.properties：

log4j.rootLogger=DEBUG, stdout

# SqlMap logging configuration...
log4j.logger.com.ibatis=DEBUG
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=DEBUG
log4j.logger.com.ibatis.sqlmap.engine.cache.CacheModel=DEBUG
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientImpl=DEBUG
log4j.logger.com.ibatis.sqlmap.engine.builder.xml.SqlMapParser=DEBUG
log4j.logger.com.ibatis.common.util.StopWatch=DEBUG
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG

# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n