Difference between revisions of "Querying"

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#REDIRECT [[XQuery]]
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Welcome to the Query Portal, which is one of the [[Main Page|main]] sections of this documentation. Here you can find more information on performing XPath and XQuery requests. Apart from standard features, BaseX offers numerous extensions, which are listed on this page.
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==Overview==
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* [[XQuery 3.0]]: supported features of the upcoming [http://www.w3.org/TR/xquery-30/ XQuery 3.0] and  [http://www.w3.org/TR/xpath20/ XPath 2.0] Recommendations
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* [[Packaging]]: Based on the [http://expath.org/modules/pkg/ EXPath Packaging System]
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* [[Full-Text]]: full-text features of XQuery
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* [[Update]]: update mechanism of XQuery
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* [[Java Bindings]]: how to call Java code from XQuery
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* [[XQuery Errors|Errors]]: errors raised by XQuery expressions
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==XQuery Functions==
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<onlyinclude>
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{| class="wikitable sortable"
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|-
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! Module
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! Description
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! Prefix
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! Namespace URI
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|-
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| [[Database Functions|Database]]
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| Accessing the database and indexes.
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| <code>db</code>
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| <code><nowiki>http://basex.org/db</nowiki></code>
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|-
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| [[File Functions|File]]
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| File handling, based on the upcoming new version of the [http://expath.org/spec/file EXPath File] module.
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| <code>file</code>
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| <code><nowiki>http://expath.org/ns/file</nowiki></code>
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|-
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| [[Full-Text Functions|Full-Text]]
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| Functions for performing full-text operations.
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| <code>ft</code>
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| <code><nowiki>http://basex.org/ft</nowiki></code>
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|-
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| [[HTTP Functions|HTTP]]
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| Sending HTTP requests, based on the [http://expath.org/spec/http-client EXPath HTTP] module.
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| <code>http</code>
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| <code><nowiki>http://expath.org/ns/http-client</nowiki></code>
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|-
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| [[JSON Functions|JSON]]
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| Parsing and serializing [http://www.json.org JSON documents]. <font color='orangered'>Version 6.8</font>
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| <code>json</code>
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| <code><nowiki>http://basex.org/json</nowiki></code>
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|-
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| [[Map Functions|Map]]
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| Handling of map structures, based on a preliminary W3C Working Draft.
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| <code>map</code>
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| <code><nowiki>http://www.w3.org/2005/xpath-functions/map</nowiki></code>
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|-
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| [[Math Functions|Math]]
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| Mathematical operations, extending the [http://www.w3.org/TR/xpath-functions-30/ W3C Working Draft].
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| <code>math</code>
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| <code><nowiki>http://www.w3.org/2005/xpath-functions/math</nowiki></code>
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|-
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| [[SQL Functions|SQL]]
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| JDBC bridge to access relational databases. <font color='orangered'>Version 6.8</font>
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| <code>sql</code>
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| <code><nowiki>http://basex.org/sql</nowiki></code>
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|-
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| [[Utility Functions|Utility]]
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| Utility functions, used for data conversions, profiling and dynamic evaluation.
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| <code>eval</code>
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| <code><nowiki>http://basex.org/util</nowiki></code>
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|-
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| [[XSLT Functions|XSLT]]
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| Stylesheet transformations, based on Java’s and Saxon’s XSLT processor.
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| <code>xslt</code>
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| <code><nowiki>http://basex.org/xslt</nowiki></code>
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|-
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| [[ZIP Functions|ZIP]]
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| ZIP functionality, based on the [http://expath.org/spec/zip EXPath ZIP] module.
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| <code>zip</code>
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| <code><nowiki>http://expath.org/ns/zip</nowiki></code>
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|}
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Note that all namespace URIs are statically bound in BaseX, i.e., they need not be declared in the query prolog.
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All XQuery 3.0 functions are listed in the [http://www.w3.org/TR/xpath-functions-30/ XQuery 3.0 Functions and Operators] draft; they are [[XQuery_3.0#Functions|all supported by BaseX]].
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==Indexes==
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Queries will be analyzed and optimized for index access on the fly.
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*[[Indexes|Overview]]: All indexes and their functionality
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*[[Execution Plan]]: Execution plans of the queries
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[[Category:XQuery]]

Revision as of 06:56, 22 September 2011

Welcome to the Query Portal, which is one of the main sections of this documentation. Here you can find more information on performing XPath and XQuery requests. Apart from standard features, BaseX offers numerous extensions, which are listed on this page.

Overview

XQuery Functions

Module Description Prefix Namespace URI
Database Accessing the database and indexes. db http://basex.org/db
File File handling, based on the upcoming new version of the EXPath File module. file http://expath.org/ns/file
Full-Text Functions for performing full-text operations. ft http://basex.org/ft
HTTP Sending HTTP requests, based on the EXPath HTTP module. http http://expath.org/ns/http-client
JSON Parsing and serializing JSON documents. Version 6.8 json http://basex.org/json
Map Handling of map structures, based on a preliminary W3C Working Draft. map http://www.w3.org/2005/xpath-functions/map
Math Mathematical operations, extending the W3C Working Draft. math http://www.w3.org/2005/xpath-functions/math
SQL JDBC bridge to access relational databases. Version 6.8 sql http://basex.org/sql
Utility Utility functions, used for data conversions, profiling and dynamic evaluation. eval http://basex.org/util
XSLT Stylesheet transformations, based on Java’s and Saxon’s XSLT processor. xslt http://basex.org/xslt
ZIP ZIP functionality, based on the EXPath ZIP module. zip http://expath.org/ns/zip

Note that all namespace URIs are statically bound in BaseX, i.e., they need not be declared in the query prolog. All XQuery 3.0 functions are listed in the XQuery 3.0 Functions and Operators draft; they are all supported by BaseX.

Indexes

Queries will be analyzed and optimized for index access on the fly.

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