mybatis框架 封装的工具类 主要功能是调用接口和配置和数据库建立联系

public class MyHelper
 
   {
    //把属性私用
    private SqlSessionFactory sf;
    private SqlSession ss;
    private Class e;
    public MyHelper(){
        InputStream i = null;
        try {
            i = Resources.getResourceAsStream("mybatis-config.xml");
            this.sf = new SqlSessionFactoryBuilder().build(i);
            this.ss = this.sf.openSession();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public SqlSessionFactory getSqlSessionFactory(){
        return this.sf;
    }

    public Connection getConn(){
        return this.ss.getConnection();
    }

    public MyHelper(Class e){
        InputStream i = null;
        try {
            i = Resources.getResourceAsStream("mybatis-config.xml");
            this.sf = new SqlSessionFactoryBuilder().build(i);
            this.ss = this.sf.openSession();
            this.e = e;
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }

   //获取session
    public SqlSession getSession(){
        return this.ss;
    }
   //无参数是调用的配置走的 StudentMapper.xml配置
    public E getMapper(){
        return (E)this.ss.getMapper(this.e);
    }
    //有参的是调用的配置走的 StudentMapper接口        
    public E getMapper(Class c){
        return (E)this.ss.getMapper(c);
    }


    //先提交后关闭session回话，之后无法再吊方法
    public void close(){
        if(this.ss!=null){
            this.ss.commit();
            this.ss.close();
        }
    }
}