If the first application automates the delivery of a query to a particular database and the formatting of the returned data, let's start with its database and query.
第一个应用程序自动化针对特定数据库的查询递送以及对所返回数据的格式化，我们不妨从其数据库和查询开始。
For sparse lookup, a database query is generated based on each input record and the query is sent to the target database to get the result.
对于稀疏查找来说，它将根据每条输入记录来生成数据库查询，并且查询将被发送给目标数据库以获取结果。
Although the query looks simpler than the XQuery, we must query the database for each item in the cart, resulting in increased database traffic and slightly more loop-oriented application code.
虽然查询看起来比XQuery简单，但我们必须为购物车中的每个货品查询数据库，导致数据库流量增加，应用程序代码有些更面向循环。
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