三、基於註解入門實例
阿新 • • 發佈：2018-07-11
tid 定義 配置 alt lse href contain source factor
1、定義操作 user 表的註解接口 UserMapper.java
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package com.ys.annocation;
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.ys.po.User;
public interface UserMapper {
//根據 id 查詢 user 表數據
@Select("select * from user where id = #{id}")
public User selectUserById(int id) throws Exception;
//向 user 表插入一條數據
@Insert("insert into user(username,sex,birthday,address) value(#{username},#{sex},#{birthday},#{address})")
public void insertUser(User user) throws Exception;
//根據 id 修改 user 表數據
@Update("update user set username=#{username},sex=#{sex} where id=#{id}")
public void updateUserById(User user) throws Exception;
//根據 id 刪除 user 表數據
@Delete("delete from user where id=#{id}")
public void deleteUserById(int id) throws Exception;
}
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2、向 mybatis-configuration.xml 配置文件中註冊 UserMapper.java 文件
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<mappers>
<mapper class="com.ys.annocation.UserMapper"/>
</mappers>
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3、創建測試類
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package com.ys.test;
import java.io.InputStream;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;
import com.ys.annocation.UserMapper;
import com.ys.po.User;
public class UserAnnocationTest {
//定義 SqlSession
SqlSession session =null;
@Before
public void init(){
//定義mybatis全局配置文件
String resource = "mybatis-configuration.xml";
//加載 mybatis 全局配置文件
InputStream inputStream = CRUDTest.class.getClassLoader()
.getResourceAsStream(resource);
//構建sqlSession的工廠
SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//根據 sqlSessionFactory 產生 session
session = sessionFactory.openSession();
}
//註解的增刪改查方法測試
@Test
public void testAnncationCRUD() throws Exception{
//根據session獲取 UserMapper接口
UserMapper userMapper = session.getMapper(UserMapper.class);
//調用selectUserById()方法
User user = userMapper.selectUserById(1);
System.out.println(user);
//調用 insertUser() 方法
User user1 = new User();
user1.setUsername("aliks");
user1.setSex("不詳");
userMapper.insertUser(user1);
//調用 updateUserById() 方法
User user2 = new User();
user2.setId(6);
user2.setUsername("lbj");
userMapper.updateUserById(user2);
//調用 () 方法
userMapper.deleteUserById(6);
session.commit();
session.close();
}
}
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註意：註解配置我們不需要 userMapper.xml 文件了
三、基於註解入門實例