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

 1 package util;
 2 
 3 import java.io.IOException;
 4 import java.io.InputStream;
 5 
 6 import org.apache.ibatis.io.Resources;
 7 import org.apache.ibatis.session.SqlSessionFactory;
 8 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 9 
10 public class SqlSessionFactoryUtil {
11     public static SqlSessionFactory sqlSessionFactory;
12     static {
13         try {
14             SqlSessionFactoryBuilder ssfb = new SqlSessionFactoryBuilder();
15             //2.配置核心文件输入流
16             InputStream resourceAsStream = Resources.getResourceAsStream("sqlMapperConfig.xml");
17             //通过输入流创建SqlSessionFactory
18             sqlSessionFactory = ssfb.build(resourceAsStream);
19             System.out.println("SqlSessionFactoryBuilder===========");
20         } catch (IOException e) {
21             e.printStackTrace();
22         }
23     }
24     public static SqlSessionFactory getSqlSessionFactory() {
25         return sqlSessionFactory;
26     }
27     
28     
29 }

接口

UserDao.java

 1 package dao;
 2 
 3 import java.util.List;
 4 
 5 import pojo.User;
 6 
 7 public interface UserDao {
 8     User getUserBYId(Integer id);
 9     List<User> getUSerByUserName(String userName);
10 }

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

 1 package dao.impl;
 2 import static org.junit.Assert.*;
 3 import org.junit.Test;
 4 import mapper.UserMapper;
 5 import pojo.User;
 6 public class UserDaoImplTest {
 7     @Test
 8     public void test() {
 9         UserMapper userDao = new UserDaoImpl();
10         User user = userDao.getUserBYId(1);
11         System.out.println(user);
12     }
13 }