Difference between revisions of "Index Module"

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=Recent Changes=
 
=Recent Changes=
  
The module was introduced with Version 7.1.
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The module was introduced with {{Version|7.1}}.
  
 
[[Category:XQuery]]
 
[[Category:XQuery]]

Revision as of 04:57, 7 February 2012

This module provides XQuery functions for displaying information stored in the database index structures. All functions are introduced with the index: prefix, which is linked to the statically declared http://basex.org/modules/index namespace.

Commonalities

All functions share $db as argument, which may either reference a string, denoting the name of the addressed database, or a node from an already opened database. The following errors may be raised by all functions:

  • BASX0001 is raised if the index required by a function is not available.
  • BASX0002 is raised if $db references a node that is not stored in a database (i.e., references a main-memory XML fragment).
  • BASX0003 is raised if the addressed database cannot be opened.

Functions

index:facets

Signatures index:facets($db as item()) as xs:string
index:facets($db as item(), $type as xs:string) as xs:string
Summary Returns information about possible facets and facet values on a database in document structure format.
If $type is specified as flat, the function returns this information in a flat summarized version.
Examples
  • index:facets("DB") returns information about facets and facet values on the database DB in document structure.
  • index:facets("DB", "flat") returns information about facets and facet values on the database DB in a summarized flat structure.

index:texts

Signatures index:texts($db as item()) as element(value)*
index:texts($db as item(), $prefix as xs:string) as element(value)*
Summary Returns all strings stored in the text index, along with their number of occurrences.
If $prefix is specified, the returned nodes will be refined to the strings starting with that prefix.

index:attributes

Signatures index:attributes($db as item()) as element(value)*
index:attributes($db as item(), $prefix as xs:string) as element(value)*
Summary Returns all strings stored in the attribute index, along with their number of occurrences.
If $prefix is specified, the returned nodes will be refined to the strings starting with that prefix.

index:element-names

Signatures index:element-names($db as item()) as element(value)*
Summary Returns all element names stored in the index, along with their number of occurrences.

index:attribute-names

Signatures index:attribute-names($db as item()) as element(value)*
Summary Returns all attribute names stored in the index, along with their number of occurrences.

Recent Changes

The module was introduced with Version 7.1.