xxxMapper.xml简单crud

<?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">
<!-- namespce是查找sql映射文件的唯一标识，必须唯一 -->
<mapper namespace="org.mybatis.example.BlogMapper">
	<!-- id是sql映射文件中方法的唯一标识 -->
	<!-- parameterType是参数数据类型 -->
	<!-- resultType是实体类的全类名 -->
	<select id="getBlog" parameterType="int" resultTYpe="org.mybatis.example.Blog">
		select * from Blog where id = #{id}
	</select>
	
	<!--新增时parameterType是对象类型，值为全类名  -->
	<insert id="addBlog" parameterType="org.mybatis.example.Blog">
		<!-- 占位符中的名称要和对象的属性名称一致 -->
	  		insert into blog(name,age) values(#{name},#{age})
	</insert>
	
	<delete id="deleteBlog" parameterType="int">
	 		delete from blod where id=#{id}
	</delete>
	
	<update id="updateBlog" parameterType="org.mybatis.example.Blog">
			update blog set name=#{name},age=#{age} where id=#{id}
	</update>
</mapper>

factory.openSession(true);//true会自动自提事物