10_mybatis Developing DAO method--mapper Proxy implementation

"Engineering (several key red boxes)"

"Usermapper.xml"

<?XML version= "1.0" encoding= "UTF-8"?><!DOCTYPE Mapper Public "-//mybatis.org//dtd mapper 3.0//en" "Http://mybatis.org/dtd/mybatis-3-mapper.dtd "><Mappernamespace= "com. Higgin.Mybatis.mapper.UserMapper">    <SelectID= "Finduserbyid"ParameterType= "int"Resulttype= "com. Higgin.Mybatis.po.User ">SELECT * from USER WHERE Id=#{id}</Select> </Mapper>

"Usermapper.java"

 Package com. Higgin.Mybatis.mapper; Import com. Higgin.Mybatis.po.User;  Public Interface usermapper {    // query user information by ID public    finduserbyid(int  throws  Exception;}

"Sqlmapperconfig.xml"

Never configure the Usermapper.xml but forget to load!

    <!--Load Map File -    <mappers>        <MapperResource= "Sqlmap/user.xml"/>                  <mapper  resource= "Mapper/usermapper.xml"   /> <!-- here, don't forget to load-      </mappers>

"Usermappertest.java"

 Packagecom. Higgin.Mybatis.mapper.test;Import Staticorg.junit.assert.*;ImportJava.io.InputStream;Importorg.apache.ibatis.io.Resources;Importorg.apache.ibatis.session.SqlSession;Importorg.apache.ibatis.session.SqlSessionFactory;ImportOrg.apache.ibatis.session.SqlSessionFactoryBuilder;ImportOrg.junit.Before;Importorg.junit.Test;Importcom. Higgin.Mybatis.mapper.UserMapper;Importcom. Higgin.Mybatis.po.User; Public classUsermappertest {Privatesqlsessionfactory sqlsessionfactory; @Before Public voidSetUp ()throwsException {//Create Sqlsessionfactory//mybatis configuration fileString resource= "Sqlmapconfig.xml"; //get configuration file streamInputStream inputstream=Resources.getresourceasstream (Resource); //creating a session factory, passing in MyBatis profile informationsqlsessionfactory=NewSqlsessionfactorybuilder (). Build (InputStream); } @Test Public voidTestfinduserbyid ()throwsException {sqlsession sqlsession =sqlsessionfactory.opensession ();   // Create a Usermapper object, MyBatis automatically generate Mapper proxy object   usermapper usermapper =sqlsession. Getmapper (usermapper. class                );       //Tuneusing the Usermapper methodUser user = Usermapper.finduserbyid (5);    System.out.println (User.tostring ()); }}

"Run Results"

10_mybatis Developing DAO method--mapper Proxy implementation