Mybatis学习2传统dao开发

传统dao开发

在mybati基础上

dao和daoimpl

1.工厂工具类

获得SqlSessionFactory

SqlSessionFactoryUtil.java

 package util;

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

 import org.apache.ibatis.io.Resources;
 import org.apache.ibatis.session.SqlSessionFactory;
 import org.apache.ibatis.session.SqlSessionFactoryBuilder;

 public class SqlSessionFactoryUtil {
     public static SqlSessionFactory sqlSessionFactory;
     static {
         try {
             SqlSessionFactoryBuilder ssfb = new SqlSessionFactoryBuilder();
             //2.配置核心文件输入流
             InputStream resourceAsStream = Resources.getResourceAsStream("sqlMapperConfig.xml");
             //通过输入流创建SqlSessionFactory
             sqlSessionFactory = ssfb.build(resourceAsStream);
             System.out.println("SqlSessionFactoryBuilder===========");
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
     public static SqlSessionFactory getSqlSessionFactory() {
         return sqlSessionFactory;
     }

 }

接口

UserDao.java

 package dao;

 import java.util.List;

 import pojo.User;

 public interface UserDao {
     User getUserBYId(Integer id);
     List<User> getUSerByUserName(String userName);
 }

实现

daoimpl

package dao.impl;

import java.util.List;

import org.apache.ibatis.session.SqlSession;

import dao.UserDao;
import pojo.User;
import util.SqlSessionFactoryUtil;

public class UserDaoImpl implements UserDao{

    public User getUserBYId(Integer id) {
        SqlSession openSession = SqlSessionFactoryUtil.getSqlSessionFactory().openSession();
        User selectOne = openSession.selectOne("test.getUserById", 1);
        // TODO Auto-generated method stub
        return selectOne;
    }

    public List<User> getUSerByUserName(String userName) {
        // TODO Auto-generated method stub
        return null;
    }

}
测试

 package dao.impl;
 import static org.junit.Assert.*;
 import org.junit.Test;
 import mapper.UserMapper;
 import pojo.User;
 public class UserDaoImplTest {
     @Test
     public void test() {
         UserMapper userDao = new UserDaoImpl();
         User user = userDao.getUserBYId(1);
         System.out.println(user);
     }
 }