To start with, let’s look at finding an element’s position within a page. You have a coupleelement properties at your disposal 在你支配下
1 概述最近维护系统时,客户经常反馈这样一个内容:要在查询列表上加上一个查询条件。这样的要求一点也不过分,并且看起来工作量也不大,不就是加一个WHERE条件嘛,但是当调试到DAL层时,立刻石化——遇到在SELECT子句中编写子查询的SQL,SELECT SO.order_no,(SELECT SUM(SOD.good_num) FROM [StockOrderDetails] AS SOD WHERE SOD.order_id=SO.id) AS order_numFROM [StockOrder] AS SO 这样的写法缺点如下:1>order_num不能在SELECT中继续使用2&g
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