数据库ORM框架mybatis 学习篇
1,老套路加载依赖库或者jar
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.7</version>
</dependency>```
<!-- mysql驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.18</version>
</dependency>
2.配置mybatis-config.xml
<?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>
<typeAliases>
<typeAlias alias="Demo" type="bean.Demo"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql:///stu"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="DemoMapper.xml"/>
</mappers>
</configuration>
3 配置"DemoMapper.xml
<?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">
<mapper namespace="bean.Demo.UserMapper">
<select id="selectUserByID" parameterType="int" resultType="Demo">
select * from demo where id = #{id}
</select>
</mapper>
4测试 注明(持久化对象,创建数据库略过)这里认为你是 熟悉Java的童鞋
@Test*斜体样式*
public void testMybatis() {
String resource = "mybatis-config.xml";**//注意配置classpath 下**
InputStream inputStream;
try {
inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSession s= sqlSessionFactory.openSession();
Demo d= (Demo)s.selectOne("bean.Demo.UserMapper.selectUserByID", 3);
System.out.println("----"+d.getId());
System.out.println("----"+d.getName());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}