SSM-MyBatis-10:Mybatis中SqlSession的getMapper()和简单的工具类MyBatisUtils

时间:2021-01-21 23:23:08
------------吾亦无他,唯手熟尔,谦卑若愚,好学若饥-------------

getMapper的作用,获取到接口,直接通过点的方式调用方法,以免直接手打的方式写错方法名,(强类型的方式)

例子:

IBookDAO mapper = session.getMapper(IBookDAO.class);
List<Book> list = mapper.findAllBook();

那个工具类,主要是获取SqlSession对象,写法

package cn.dawn.util;

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; /**
* Created by Dawn on 2018/2/24.
*/
public class MyBatisUtils { static String path = "mybatis-config.xml";
static InputStream e;
static SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
static SqlSessionFactory factory;
static {
try {
e = Resources.getResourceAsStream(path);
factory = builder.build(e);
} catch (IOException e1) {
e1.printStackTrace();
}
} public static SqlSession getSession(){
return factory.openSession();
}
}

他这个方法怎么使用呢?

如下:

SqlSession session= MyBatisUtils.getSession();