xquery if statement

About XQuery XQuery differs in many key ways from SQL, largely because the two languages are designed for two data models with different characteristics. XML documents contain hierarchies and have their intrinsic order. The tabular data structures supported by the SQL-BASED database management system are planar (flat) and are based on collections; therefore, there is no order between rows. The difference

XML involves a series of technical specifications and related technologies, with many and complex concepts. Here, we will briefly introduce four concepts: XPath, XSLT, XQuery, and xqueryx, which are W3C specifications. XPath is the XML Path Language. XPath provides general syntax and semantics for locating and linking information in an XML document. It is an expression language that can be used to easily identify nodes in XML documents. XPath is de

XQuery The language used to extract data from XML data fields is called XQuery. Example: First, create a database: Insert data into the table: Insert into [xmlstudy]. [DBO]. [purchaseorders] ([purchaseid], [purchaseorder]) values (2 ,'My style"Author ="Discuz! NT"Createdate ="2008-5-27"Ver ="2.5"Fordntver ="2.5"Copyright ="Copyright 2008 comsenz Inc."/> Insert into [xmlstudy]. [DBO]. [purc

A friend asked the following question: A table contains two fields of the XML field type, which store the old value and the updated value,For example: Now I want to compare the differences between the two values through an xquery. Do you have any good methods or suggestions? In fact, using SQL 2008/xQuery is very simple. Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlig

Copied from http://www.mssqltips.com/sqlservertip/1771/splitting-delimited-strings-using-xml-in-sql-server/DECLARE @t TABLE(IDINT IDENTITY, the dataVARCHAR( -) )INSERT into @t(data)SELECT 'Aa,ab,ac,ad'INSERT into @t(data)SELECT 'BA,BB,BC'SELECT * from @tSELECTID, data, D.r.value ('.','nvarchar ()') DD from ( SELECTID, data,CAST('' + REPLACE(Data,',','')+ '' asXML) XMLData from @t) A CrossAPPLY A.xmldata.nodes ('Data') asD (R)Split strings and convert single column to multiple rows by us

Although XPath and XQuery can achieve some of the same functionality, XPath is simpler and XQuery is more powerful and flexible. XPath is perfect for many queries. For example, creating an unordered list of phone numbers from some of the records in an XML document is easiest to use with XPath. However, if you need expressions that express more complex record selection criteria, convert a result set, or make

At present, many open-source organizations and companies have implemented query Engines Based on the XQuery reference standards. The Representative open-source XQuery engines are XQEngine, Saxon, Galax, and other open-source XQuery engines, dataDirect company's DataDirect Xquery. 1. Install datadirectxquery. jar to obt

FLWOR is a "for, let, Where, Order by, Return" acronym.The For statement extracts all the book elements under the bookstore element into a variable named $x.The WHERE statement selects the book element with the price element value greater than 30.The order BY statement defines the sort order. will be sorted according to the title element.The return

The source uses yesterday's example to load the Book.xml into the collection of the books database named novel.Check what's Inside:Se_term-query "for $p in Collection (' novel ')/books return $p" booksThe result under Windows is this:D:\sedna\bin>se_term-query "for $p in Collection (' novel ')/books return $p" booksResults under Linux:[Email protected] bin]$/se_term-query "for $p in Collection (' novel ')/books return $p" Bookssedna message:error XPST00 03It is a static error if an expression wa

Introduction to XQuery (II)Author: gobitan (rain) Date: Reprinted please indicate the source of http://blog.csdn.net/gobitan in the "XQuery use entry (a)" has been using Berkeley dB XML to build an experimental XQuery environment, now you can start learning XQuery. This article describes how to use XPath to query eleme

/*SQLGetting Started with XML:--by Jinjazz--http://blog.csdn.net/jinjazz1. xml: Ability to recognize elements, attributes, and values2. XPath: addressing language, lookup similar to Windows directory (go to the wall if you don't use the dir command)Syntax format, which can be combined as a condition:"." Express oneself, "..." Said the father, "/" said the Son, "//" to indicate the offspring,"Name" means find by First name, "@name" means find by propertySet [condition] represents a subset of the

Support Xquery,xquery in. Net1.2 the use of a query language called FLWOR (Tone flower). Examples are as follows: Using System; Using System.IO; Using System.Xml; Using System.Xml.Query; Using System.Data.SqlXml; Namespace xquery{ public class xquerysample{ public static void Main (string[] args) { System.Xml.XmlDataSourceResolver ds = new System.Xml.XmlDataSour

XSD xml schema definition (XML schema definition) can write XML that meets the requirements according to the given Architecture XPATH (XML query language). The path can be used to access the path. XSLT (extensible stylesheet language transformation) is a language used to convert XML documents into XHTML documents or other XML documents. Simple tutorial XQUERY is easier to use than XSLT. It is a query language designed by W3C for XML. Similar to

= re_letters | re_marks | re_numbers | re_punctuation | re_separators | re_symbols | re_others;// [29] letters: = 'l' [ultmo]?Re_letters = Qi: Char _ ('l')>-Qi: Char _ ("ultmo ");// [30] marks: = 'M' [nce]?Re_marks = Qi: Char _ ('M')>-Qi: Char _ ("nce ");// [31] numbers: = 'n' [DLO]?Re_numbers = Qi: Char _ ('n')>-Qi: Char _ ("DLO ");// [32] punctuation: = 'P' [cdseifo]?Re_punctuation = Qi: Char _ ('P')>-Qi: Char _ ("cdseifo ");// [33] separators: = 'Z' [SLP]?Re_separators = Qi: Char _ ('Z')>-Qi

One, for Loop statement practiceAbout the two problem types that exist for a for loopPoor lift: Do not know what the situation is really to find our results, we can let one after another go through.Iterative: In the existing conditions according to the law of constant solution, the intermediate situation, the final inferred results1, 99 multiplication table2, 100 within the base of the combined and (iterative cycle of death)3, the creation of man-mach

Python introductory statement, including if statement, while statement, for statement, for Python beginners reference. If statement Example name = ' Peirong '; if name = = ' Peirong ': print ' This is Peirong ', elif name== ' Maojun ': print ' this is Maojun '; else: pri

TAGS: LSE multi-debit value done condition test execution Sele AC lineMainly introduces the syntax of Shell Basic statementIf statement syntax1 single branch structure (if, then)If Or as follows:If ? Then? InstructionsFi2 Dual-branch structure (if, then, otherwise ...) )If ? Then? InstructionsElse? InstructionsFiMulti-branched structure (if, then, otherwise if, then, otherwise ...) )If ? Then? Instructionselif ? Then? InstructionsElse? InstructionsFiW

Tags:bms demo conversion berfor loops charoracletput execution --Multiple IF statements ( note: BEGIN END, IF condition then,elsif condition Then,else ... END IF ) begin if FALSE then Dbms_output.put_line (' Execute if statement ... '); elsif 　　True then Dbms_output.put_line (' Execute ELEIF1 statement ... '); elsif 　　TRUE then Dbms_output.put_line (' Execute ELEIF2