MyBatis阶段性总结

创建好maven项目之后修改pom.xml配置文件

修改打包方式为war

    4.0.0

    org.example
    mybatis_demo03
    1.0-SNAPSHOT
    war

在webapp目录下添加WEB-INF目录

在WEB-INF下添加web.xml配置文件

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在pom.xml中添加两个依赖

    
    
        javax.servlet
        javax.servlet-api
        4.0.1
        provided
    


    
    
        javax.servlet
        jsp-api
        2.0
        provided
    

    org.mybatis
    mybatis
    3.4.6




    mysql
    mysql-connector-java
    5.1.47

MyBatisUtil

package com.ccl.Utils;

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 java.io.IOException;
import java.io.InputStream;


public class MyBatisUtil {
    private static SqlSessionFactory factory;
    private static final ThreadLocal local = new ThreadLocal();


    static{
        try {
            InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
            SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
            factory = builder.build(is);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public static SqlSessionFactory  getFactory(){
        return factory;
    }

    private static SqlSession getSqlSession(boolean isAutoCommit){
        SqlSession session = local.get();
        if (session == null){
            session = factory.openSession(isAutoCommit);
            local.set(session);
        }
        return session;
    }

    public static SqlSession getSqlSession(){
        return getSqlSession(false);
    }

    public static  T getMapper (Class c){
        SqlSession session = getSqlSession(true);
        T dao = session.getMapper(c);
        return dao;
    }
    
}