package com.xuweiwei.mybatis.mapper;

import com.xuweiwei.mybatis.pojo.Employee;
import org.apache.ibatis.annotations.ResultType;
import org.apache.ibatis.annotations.Select;

public interface EmployeeMapper {

    @Select("select id as id,last_name as lastName,gender as gender,email as email from employee where id = #{id}")
    @ResultType(Employee.class)
    Employee getBemployeeById(Integer id);

}

package com.xuweiwei.mybatis.test;

import com.xuweiwei.mybatis.mapper.EmployeeMapper;
import com.xuweiwei.mybatis.pojo.Employee;
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 org.junit.Test;

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

public class MybatisTest {

    /**
     * 测试增加
     *
     * @throws IOException
     */
    @Test
    public void test() throws IOException {
        /**
         * 创建SqlSessionFactory对象
         */
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        /**
         * 创建SqlSession
         */
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        EmployeeMapper employeeMapper = sqlSession.getMapper(EmployeeMapper.class);

        Employee employee = employeeMapper.getBemployeeById(1);
        System.out.println("====employee===："+employee);


        Employee employee2 = employeeMapper.getBemployeeById(1);
        System.out.println("====employee2===："+employee2);

        sqlSession.close();
    }
}