<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<!--namespace对应mapper接口所在的位置-->
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<mapper namespace="com.dy.pipIrrGlobal.daoDemo.DemoTestMapper">
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<!--对应mapper接口中的方法public Integer queryCount();-->
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<select id="queryCount" resultType="java.lang.Integer">
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select count(*) from demo_test ;
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</select>
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</mapper>
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