[刘阳Java]_MyBatis_注解基本用法_第10讲

MyBatis注解提出，可以说是非常好简化了MyBatis配置文件的使用。下面我们简单地来告诉大家如何使用MyBatis的注解

• 定义接口

package com.gxa.dao;

import java.util.List;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import com.gxa.pojo.Teacher;

public interface TeacherDao {
    
    @Insert("insert into teacher (t_id,t_name) values (#{t_id},#{t_name})")
    public intinsertTeacher(Teacher teacher);
    
    @Update("update teacher set t_name=#{t_name} where t_id=#{t_id}")
    public intupdateTeacher(Teacher teacher);
    
    @Delete("delete from teacher where t_id = #{t_id}")
    public intdeleteTeacher(intt_id);
    
    @Select("select * from teacher")
    public List<Teacher>getTeacher();
}

• 在MyBatis核心配置文件注册好映射接口

<mapper class="com.gxa.dao.TeacherDao"/>

• 马上来使用Java程序来测试一下

package com.gxa.test;

import java.io.IOException;
import java.io.Reader;
import java.util.List;

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 com.gxa.dao.TeacherDao;
import com.gxa.pojo.Student;
import com.gxa.pojo.Teacher;

public class Test04 {
    private static SqlSessionFactorysqlSessionFactory;
    private static Reader reader;
    
    static {
        try {
            reader = Resources.getResourceAsReader("config.xml");
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    @Test
    public void m01() {
        SqlSessionsqlSession = sqlSessionFactory.openSession();
        TeacherDaoteacherDao = sqlSession.getMapper(TeacherDao.class);
        List<Teacher> list = teacherDao.getTeacher();
        for (Teacher teacher : list) {
            System.out.println(teacher.getT_id() + "=====" + teacher.getT_name());
        }
        sqlSession.close();
    }
    
}