05.MyBatis中当实体类中的属性名和表中的字段名不一样怎么办 ？.zip

package com.atguigu.mybatis.test; import java.io.IOException; import java.io.InputStream; 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.jupiter.api.Test; import com.atguigu.mybatis.entities.Employee; import com.atguigu.mybatis.mapper.EmployeeMapper; class MyBatisTest { //1.MyBatis中当实体类中的属性名和表中的字段名不一样 ，怎么办 ？ /* * 解决方案： * 1.写sql语句时起别名 * 2.在MyBatis的全局配置文件中开启驼峰命名规则 * 3.在Mapper映射文件中使用resultMap来自定义映射规则 */ @Test void testGetEmployee() throws IOException { //1.创建SqlSessionFactory对象 String resource = "mybatis-config.xml"; InputStream inputStream = Resources.getResourceAsStream(resource); SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); //2.获取sqlSession，sqlSession就相当于JDBC中的connection SqlSession sqlSession = sqlSessionFactory.openSession(); try { //3.获取Mapper对象 EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class); //4.调用EmployeeMapper中获取Employee的方法 Employee employee = mapper.getEmployeeById(1); System.out.println(employee); } finally { //5.关闭sqlSession sqlSession.close(); } } }