User manual MACROMEDIA COLDFUSION 4.5-DEVELOPING WEB APPLICATIONS

[. . . ] Developing Web Applications with ColdFusion ColdFusion 4. 5 Allaire Corporation Copyright Notice © 1999 Allaire Corporation. This manual, as well as the software described in it, is furnished under license and may be used or copied only in accordance with the terms of such license. The content of this manual is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by Allaire Corporation. Allaire Corporation assumes no responsibility or liability for any errors or inaccuracies that may appear in this book. [. . . ] Operators are normally surrounded by angle brackets < >. However, you can use the AND, OR, and NOT operators in a simple query without using angle brackets. A simple query employs the STEM operator and the MANY modifier. STEM searches for words that derive from those entered in the query expression, so that entering "find" will return documents that contain "find, " "finding, " "finds, " etc. The MANY modifier forces the documents returned in the search to be presented in a list based on a relevancy score. Explicit query expressions Explicit queries can be constructed using a variety of operators, which are described below. Most operators in an explicit query expression are surrounded by angle brackets < >. You can use the AND, OR, and NOT operators without angle brackets. Expression syntax You can use either simple or explicit syntax when stating simple query syntax. The syntax you use determines whether the search words you enter will be stemmed, and whether the words that are found will contribute to relevance-ranked scoring. Simple syntax When you use simple syntax, the search engine implicitly interprets single words as if they were modified by the MANY and STEM operators. By implicitly applying the MANY modifier, the search engine calculates each document's score based on the Chapter 11: Indexing and Searching Data 167 density of the search term in the searched documents. The more frequent the occurrence of a word in a document, the higher the document's score. As a result, the search engine ranks documents according to word density as it searches for the word you specify, as well as words that have the same stem. For example, "films, " "filmed, " and "filming" are stemmed variations of the word "film. " To search for documents containing the word "film" and its stem words, you can enter the word "film" without modification. When documents are ranked by relevance, they appear in a list with the most relevant documents at the top. Explicit syntax When you use explicit syntax, the search engine interprets the search terms you enter as literals. For example, by entering the word "film" (including quotation marks) using explicit syntax, the stemmed versions of the word "film", "films, " "filmed, " and "filming" are ignored. The following table shows all operators available for conducting searches of ColdFusion Verity collections. Verity Search Operators < <= = > >= Accrue AND CONTAINS ENDS MATCHES NEAR NEAR/N OR PARAGRAPH PHRASE SENTENCE STARTS STEM SUBSTRING WILDCARD WORD 168 Developing Web Applications with ColdFusion Special characters A number of characters are handled in particular ways by the search engine. Special Search Characters Characters , () [ = > <!' @ ` < {[! Description These characters end a text token. They are terminated by an associated end character. These characters signify the start of a delimited token. They are terminated by an associated end character. A backslash (\) removes special meaning from whatever character follows it. To enter a literal backslash in a query, use two in succession, such as this examples: <FREETEXT>("\"Hello\", said Packard. ") "backslash (\\)" Composing Search Expressions The following rules apply for composing search expressions. Precedence rules Expressions are read from left to right. The AND operator takes precedence over OR operators. However, terms enclosed in parenteses are evaluated first. [. . . ] 347 Deleting Registry Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348 346 Developing Web Applications with ColdFusion Overview of Registry Access in ColdFusion ColdFusion includes the CFREGISTRY tag, which allows you to get, set, and delete registry values. The registry is a database that Windows uses to maintain hierarchical information about users, hardware, and software. Under UNIX, ColdFusion includes functionality that emulates the registry. [. . . ]