第一步:建立一个source 资源文件,在文件下创建 Configuration.xml 如下:
<?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>
<!-- 引入database.properties文件 -->
<properties resource="database.properties"></properties>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${name}"/>
<property name="password" value="${pass}"/>
</dataSource>
</environment>
</environments>
<mappers>
<!-- 将mapper文件加入到配置文件中 -->
<mapper resource="cn/yct/mapper/FactoryMapper.xml"/> 对应第二步的包名加上XML的名称
</mappers>
</configuration>
第二步:创建一个包 cn.yct.mapper 在包下创建一个XML 为 FactoryMapper.xml 代码如下:
<?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="cn.yct.mapper.FactoryMapper"> 对应自己的包名再加上 FactoryMapper
<select id="selectBlog" parameterType="int" resultType="cn.yct.entiy.factory"> 实体层
SELECT * FROM factory_info WHERE factory_time >'2015'
</select>
</mapper>
第三步 创建一个Servlet 代码如下:
String source="configuration.xml"; 对应第一步的 XMl 名称
InputStream is=Resources.getResourceAsStream(source);
SqlSessionFactory factory=new SqlSessionFactoryBuilder().build(is);
SqlSession sqlSession=factory.openSession();
List<factory> list=new ArrayList<factory>();
try{
list=sqlSession.selectList("cn.yct.mapper.FactoryMapper.selectBlog"); 获取的是集合对象 对应的是第二步的包名+FactoryMapper+第二步的select 里面的id
}finally{
sqlSession.close();
}
for(factory factory2:list){
out.print("类型:"+factory2.getFactory_type()+"<br>价格"+factory2.getFactory_price()+"<br>出厂日期:"+factory2.getFactory_time());
}