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Description: delphi 控件,SQL执行引擎控件,用于数据二次分析。-delphi Control, the implementation of the SQL engine controls for secondary data analysis.
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Description: delphi 控件,SQL执行引擎控件,用于数据二次分析。-delphi Control, the implementation of the SQL engine controls for secondary data analysis.
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Size: 1134592 |
Author: zwldelphi |
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Description: XML Query(XQuery)是在 XML 数据中搜索特定信息的功能强大的新方法。与 XPath 2.0 的起源相同,XQuery 的某些方面 — 如传统的 XPath 表达式 — 看上去很熟悉,而其它方面(如 FLWR 和条件语句)则是全新的。为了帮助消除解释问题,XQuery 工作组创建了“XML Query Use Cases”文档(请参阅参考资料,它提供了样本查询及其预期的结果。本教程中的示例都基于为该文档创建的样本数据。
XQuery 是 XML 规范和 W3C 建议书之间相互关系的优秀示例。XQuery 工作组与 XSL 工作组还一起负责 XPath 2.0 工作草案,XPath 2.0 将包括许多为 XQuery 开发的功能。
除了对 XPath 的增强外,XQuery 还允许您通过嵌套类 SQL 的子句来创建复杂查询,以及通过将 XML 构造器直接包括在输出中来创建复杂结果。本章概述了 XQuery 的这些方面,然后将更详细地讨论每个方面。-XML Query (XQuery) is in the XML data in the powerful search certain information of new methods. XPath 2.0 origin with the same XQuery, some aspects of the traditional XPath expression-- such as very familiar, but look-- other aspects (such as FLWR and conditionals) is new. In order to help eliminate explain a problem, created "XQuery group Use Query XML document on" (please refer to reference material, it provides samples and inquires. This tutorial examples for this document creation based on the sample data.
W3C XML standard and XQuery is the relationship between the proposal outstanding examples. Working with XSL working XQuery XPath 2.0 is responsible for working together, XPath 2.0 will include the draft for the XQuery function of many development.
In addition to the enhancement, XPath XQuery also allow you through the nested class SQL clauses to create complex queries, and through XML constructor directly included in the output to create complex results. This chapter summari
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