Mybatis 개발 환경 구축 데이터 삭제 검사 기능 구현

<?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>
<!-- 
 ， db.properties 
driver=com.MySQL.jdbc.Driver
url=jdbc:mysql://localhost:3306/usertest
username=root
password=root
--!>
<properties resource="db.properties">
</properties>
<!--  --!>
<typeAliases>
<!-- <package name="com.leige.entity" /> -->
<typeAlias type="com.leige.entity.User" alias="user"/>
</typeAliases>
<!-- development  ，work  -->
<environments default="development">
<environment id="development">
<transactionManager type="jdbc"></transactionManager>
<!--   -->
<dataSource type="POOLED">
<!--   -->
<property name="driver" value="${driver}"/>
<!--   -->
<property name="url" value="${url}"/>
<!--   -->
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<!--  xml，mapper resource --!>
<!-- <mappers>
<mapper resource="com/leige/entity/UserMappen.xml"></mapper>
</mappers> -->
<!-- ，mapper class， --!>
<mappers>
<mapper class="com.leige.impl.UserImpl"/>
</mappers>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--  ： xml( )，  -->
<mapper namespace="com.leige.entity.UserMappen">
<!--   -->
<select id="selectAll" resultType="user">
select * from user
</select>
<!--   -->
<update id="insertUser" parameterType="user">
insert into user values (null,#{name},#{password},#{age})
</update>
</mapper>
 
public interface UserImpl {
// ， @update， @select， @insert， @delete 
@Update("update user set name=#{name} where id=#{id}")
public void updateUser(User user);
}
demo 
public class Demo {
static InputStream in = null;
static SqlSessionFactory ssf = null;
static{
in = Demo.class.getClassLoader().getResourceAsStream("config.xml");
ssf = new SqlSessionFactoryBuilder().build(in);
}
public static void main(String[] args) {
//selectAll();
//insertUser();
updateUser();
}
// 
public static void selectAll(){
SqlSession session = ssf.openSession();
List<User> list = session.selectList("com.leige.entity.UserMappen.selectAll");
System.out.println(list);
session.close();
}
// 
public static void insertUser(){
SqlSession session = ssf.openSession();
User user = new User();
user.setName(" ");
user.setPassword("aaaaa");
user.setAge(25);
int num = session.insert("com.leige.entity.UserMappen.insertUser",user);
session.commit();
System.out.println(num);
session.close();
}
// 
public static void updateUser(){
SqlSession session = ssf.openSession();
UserImpl userImpl = session.getMapper(UserImpl.class);
User user = new User();
user.setName(" ");
user.setPassword("aaaaa");
user.setAge(25);
user.setId(79);
userImpl.updateUser(user);
session.commit();
session.close();
}
}
</configuration>