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03-mybatis注解开发-注解完成基本的crud

发布时间：2025-02-03 09:57:18编辑：雪饮阅读（）

接续上篇，只不过这次不用UserMapper.xml而是采取注解的方式，所以将之前的resources/sp29/mapper/UserMapper.xml删除就行了。实际连resources/sp29/删除都是可以的。
然后我们之前的sqlMapConfig.xml中将配置接口扫描所在的接口所在的包，因为我们将为接口进行注解。
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <properties resource="jdbc.properties"/>

    <typeAliases>
        <typeAlias type="sp29.domain.User" alias="user"/>
    </typeAliases>
    <typeHandlers>
        <typeHandler handler="sp29.handler.DateTypeHandler"/>
    </typeHandlers>
    <environments default="developement">
        <environment id="developement">
            <transactionManager type="JDBC"></transactionManager>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
   

   <!--加载映射关系-->
    <mappers>
        <!--指定接口所在的包-->
        <package name="sp29.dao"/>
    </mappers>
</configuration>
然后我们的UserMapper.java这个接口中将原本在UserMapper.xml中的sql都对应注解过来。
package sp29.dao;


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 sp29.domain.User;

import java.util.List;

public interface UserMapper {
    @Select("select * from user")
    public List<User> findAll();

    @Select("select * from user where id=#{id}")
    public User findById(int id);

    @Delete("delete from user where id=#{id}")
    public void delete(int id);

    @Update("update user set username=#{username},password=#{password} where id=#{id}")
    public void update(User user);

    @Insert("insert into user values(#{id},#{username},#{password},'','',#{birthday})")
    public void save(User user);
}
然后之前的测试类MapperTest.java保持不变：
package sp29;

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.Before;
import org.junit.Test;
import sp29.dao.UserMapper;
import sp29.domain.User;

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

public class MapperTest {
    private UserMapper mapper;
    @Before
    public void before() throws IOException{
        InputStream resourceAsStream= Resources.getResourceAsStream("sqlMapConfig.xml");
        SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(resourceAsStream);
        SqlSession sqlSession=sqlSessionFactory.openSession(true);
         mapper=sqlSession.getMapper(UserMapper.class);
    }
    @Test
    public void testSave(){
        User user=new User();
        user.setUsername("kasumi");
        user.setPassword("abc");
        mapper.save(user);
    }
    @Test
    public void testUpdate(){
        User user=new User();
        user.setId(17);
        user.setUsername("kasumi");
        user.setPassword("456");
        mapper.update(user);
    }
    @Test
    public void testDelete(){
        mapper.delete(17);
    }
    @Test
    public void testFindById(){
        User user=mapper.findById(1);
        System.out.println(user);
    }
    @Test
    public void testFindAll(){
        List<User> userList=mapper.findAll();
        for (User user:userList) {
            System.out.println(user);
        }
    }
}
再次进行crud测试即可。