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Thursday, November 26, 2020 | History

4 edition of Rewriting queries over XML views found in the catalog.

Rewriting queries over XML views

Theophanis Tsandilas

Rewriting queries over XML views

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  • 35 Currently reading

Published by National Library of Canada in Ottawa .
Written in English


Edition Notes

Thesis (M.Sc.) -- University of Toronto, 2001.

SeriesCanadian theses = -- Thèses canadiennes
The Physical Object
FormatMicroform
Pagination1 microfiche : negative.
ID Numbers
Open LibraryOL20976625M
ISBN 100612629740
OCLC/WorldCa52460262

page_with_curl: Format, Query and Pretty Print 'HTML'/'XML' Content in R (RStudio viewer or browser) - hrbrmstr/xmlview.


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Rewriting queries over XML views by Theophanis Tsandilas Download PDF EPUB FB2

Query rewriting plan answering plan for views set V efficiently. Query Rewriting over the Multiple Views System Infrastructure Recall the basic process to generate the query rewriting plan over the single XML view first.

Given one XPath view and one XPath query, we try to match the main path of the query against the main path of the view. Rewriting Queries over XML Views. Article January Several XML-based query languages have been proposed, each oriented toward a specific category of information.

Quilt is a new proposal. of XML queries over XML type tables and views to be transformed into their semantically equivalent relational or object relational queries. These queries are then amenable to classical relational optimisations yielding XML query performance comparable to relational.

Furthermore, this rewrite technique lays out a foundation to enable rewrite of. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract XML query rewriting in the distributed computing environment receives high attention recently.

Different from existing work, we focus on the query rewriting in the cases that there are multiple views at the client side. We design two data structures to manage the multiple XML views.

@MISC{Tsandilas01rewritingqueries, author = {Theophanis Tsandilas and Theophanis Tsandilas}, title = {Rewriting Queries over XML Views}, year = {}} Share.

OpenURL. Abstract. A thesis submitted in conformity with the requirements. Keyphrases. xml view Powered by: About CiteSeerX; Submit and Index Documents.

To avoid the overhead of view Rewriting queries over XML views book in query answering, these queries later undergo rewriting so that they are valid over the original DTD schema, and thus the query answer is computed from the original XML data. We provide an algorithm for query rewriting and show its performance compared with the naive approach, i.e.

the approach. Query Rewriting over Generalized XML Security Views - CORE. by combining at every step, a smaller rewriting with an extra view.

The combination either produces a rewriting over a bigger view set, or fails if it is non-minimal, i.e., if the new view was redundant with respect to the smaller rewriting. Second, we consider a rich dialect of XQuery, where a single query (respectively, view) can return.

IHAC which asked for a rewrite, where the original query is. These pages will show you more about how to query XML in T-SQL: Querying XML fields using t-sql. Flattening XML Data in SQL Server.

EDIT. After playing with it a little bit more, I ended up with this amazing query that uses CROSS APPLY. This one will search every row (role) for the value you put in your like expression Given this table.

However, little work has been done on efficient evaluation of the generated query rewriting plans against XML views. As discussed in Lakshmanan et al. (), the maximally-contained query rewriting plan may be the union of exponential number of sub-plans.

Fig. 1 illustrates a query, a view and the query rewriting plans. The root node c (the result node) of the result is circled with the. In this post, we’ll look into finding the best ways to perform ad-hoc queries against Rewriting queries over XML views book files using SQL Server’s XQuery implementation and end up with the results in a table.

Let’s use Microsoft’s sample file, which contains 12 book entity records that include element and attribute values for book id, author, title, genre. The exist() method is used in our query as the WHERE criterion to filter the XML data, finding XML records where the Education node's value is equal to the text ‘Bachelors'.

The exist() method returns a bit value of 1 if the method finds a non-empty node whose element or attribute value matches the given criteria. Similar to XMLType tables, XMLType views can conform to an XML schema.

This provides stronger typing and enables optimization of queries over these views. To use XMLType views with XML schemas, you must first register your XML schema with annotations that represent the bi-directional mapping from XML to SQL object types.

These provide stronger typing than non-schema-based XMLType views. XPath rewrite of queries over XMLType views is enabled for both XML schema-based and non-schema-based XMLType views.

XPath rewrite is described in "XPath Rewrite on XMLType Views". To create an XML schema-based XMLType view, first register your XML schema. If the view is an. @MikaelEriksson, no, I just say that xPath is quite slow in general. Recently I had to rewrite a view with lots of xPath to concrete tables that I need to maintain, just to get some reasonable performance.

– Albin Sunnanbo Dec 10 '11 at Answering Approximate Queries Over XML Data To buy this project in ONLINE, Contact: Email: [email protected], Website: B.

That is, you can return an entire XML document stored in the column, but you cannot query within the document or return fragments of the document. To query values within an XML document or return fragments of a document, you must use XQuery.

The queries in this lesson use XQuery in an SQL context and SQL in an XQuery context. When XML is decomposed into relational columns by using AXSD that are full-text indexed, XPath queries that occur over the XML view do not perform full-text search on the underlying tables.

Download source - KB; Introduction. Recently, after submitting a Beginner's tip here at CodeProject on rewriting XML files, someone who follows my work suggested I use XLINQ (now in ).I decided to take him up on that offer.

I would classify this tip as Intermediate and suggest checking the earlier tip as needed. Because queries on XML data return XML sequences, a query's result can be used in the construction of XML data as well.

Introduction to XQuery XQuery is a functional programming language that was designed by the World Wide Web Consortium (W3C) to meet specific requirements for querying and modifying XML data. Laboratoire de Recherche en Informatique.

Breaking XML Queries Down Graphically. Lastly, now that we've explained the basic concepts, we can show a more realistic use case, iterating through the various child elements. The following diagram illustrates a series of queries and points to the value, values, or XML that each query.

Use Visual C# to read XML data from a URL. 04/13/; 4 minutes to read; R; A; In this article. This article shows you how to use the XmlTextReader class to read XML from a URL. The streamed information can come from kinds of sources, such as a byte stream from a server, a file, or a TextReader class.

Original product version: Visual Studio Original KB number: Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. In Chapter 2, XML in Practice, we went over some basic XSLT and CSS using a very simple XML document.

In this chapter, we’re going to revisit some of those concepts with a. Two separate Dictionarys are used for each of the sample XML files in the demo you are sure of no collisions in your XML files, the same two Dictionarys could be used for multiple XML is part of the setup code in the InitDicts method for the Dictionarys used to save and restore text in   SQL- Querying XML attributes from XML Column Posted on Janu by Prashanth Jayaram Read XML column attributes in to two columns DimType and Dimvalue from the below example also retrieve the data matching values[DimTypes (WIDTH or Height)].

Search the world's most comprehensive index of full-text books. My library. XML stands for eXtensible Markup Language. It is a simple and flexible markup language.

It is known as universal language for data on the web because XML documents can be created and used in any language. It is universal standard for information interchange. XML technology facilitates you to create your own markup language.

more details. Hello everyone, I have a column in my database that has xml stored in it. I am attempting to query that column to return vales from it. This is my first encounter working with Xquery so please take nothing for granted it could be a noob mistake.

This is my query that keeps returning false I am using @xml variable instead of your real database. LINQ in Action is a fast-paced, comprehensive tutorial for professional developers who want to use LINQ.

This book explores what can be done with LINQ, shows you how it works in an application, and addresses the emerging best practices.

It presents the general purpose query facilities offered by LINQ in the upcoming C# and languages. XmlStarlet 'select' or 'sel' option can be used to query or search XML documents.

Here is synopsis for 'xml sel' command: XMLStarlet Toolkit: Select from XML document(s) Usage: xml sel {} [ xml-file> ] where - global options for selecting xml-file> - input XML document file name/uri (stdin is used if missing) - template for querying.

Learn to create and configure spring boot jsp view resolver which uses JSP template files to render view layer. This example uses embedded Tomcat server to run the application.

Sourcecode Structure. The files in this application are placed as given structure in image. Spring Boot Application Structure Maven dependencies – XML Separates Data from Presentation. XML does not carry any information about how to be displayed.

The same XML data can be used in many different presentation scenarios. Because of this, with XML, there is a full separation between data and presentation.

The goal of this post is to read XML data from an XML file. We will create respective tables accordingly and obtain some sort of meaningful information.

It goes over the steps we need to perform in SQL in order to complete this. An XML database is a data persistence software system that allows data to be specified, and sometimes stored, in XML format.

This data can be queried, transformed, exported and returned to a calling databases are a flavor of document-oriented databases which are in turn a category of NoSQL database. According to your description, I understand you want to rewrite the ListBox items you have saved in xml file before.

To achieve that I think we should do the following things when rewrite/save: 1. Identify whether it is a rewrite action. If true go to 2, if false save it.

Find the one that need rewritten in xml file. Update the data we find. Screen Image of XQuery Results in oXygen []. There are several ways to test your XPath expressions. One of the most useful is to put your XML test data in document within eXist and then use a tool such as oXygen to execute the test on the server but then display the results in.

Searching and Retrieving Results Using XML Search. The Front-End can return search results in an XML format.

Using XML search is useful to easily integrate Coveo search results in a third-party application or a website without making calls to the Coveo API. Power Query will analyze the web page, and load the Navigator pane in Table View.

If you know which table you want to connect to, then choose it from the list. For this example, we chose the Results table. Otherwise, you can switch to the Web View and pick the appropriate table manually.

In this case, we've selected the Results table.A view is actually a composition of a table in the form of a predefined SQL query.

A view can contain all rows of a table or select rows from a table. A view can be created from one or many tables which depends on the written SQL query to create a view. Views, which are a type of virtual tables allow users to do the following −. Pinal Dave is a SQL Server Performance Tuning Expert and an independent consultant.

He has authored 12 SQL Server database books, 35 Pluralsight courses and has written over articles on the database technology on his blog at a Along with 17+ years of hands-on experience, he holds a Masters of Science degree and a number of database certifications.