20170725

链接语句：

int count =0 ;
InputStream is=null;
SqlSession sqlSession=null;

try {
is=Resources.getResourceAsStream("mybatis-config.xml");
SqlSessionFactory factory =new SqlSessionFactoryBuilder().build(is);
sqlSession = factory.openSession();

读取语句：

count= sqlSession.selectOne("com.yy.dao.UserDao.count");

xml：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mypper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper  namespace="com.yy.dao.UserDao">




<select id="count" resultType="int">
select count(*) from jdbc
</select>

<mapper>

导入po包：

配置：

<mappers>
<mapper resource="com/yy/dao/UserMapper.xml"/>
</mappers>

加入jar包：