Index Module

From BaseX Documentation
Jump to navigation Jump to search

This XQuery Module provides functions for displaying information stored in the database index structures.

For functions that use the indexes to return nodes see Value Indexes in the Database Module and ft:search in the Full-Text Module.

Conventions

All functions and errors in this module are assigned to the http://basex.org/modules/index namespace, which is statically bound to the index prefix.

Functions

index:facets

Signature 
index:facets(
  $db    as xs:string,
  $type  as xs:string  := ()
) as xs:string
Summary Returns information about all facets and facet values of the database $db in document structure format.
If $type is specified as flat, the function returns this information in a flat summarized version. The returned data is derived from the Path Index.
Errors db:get: The addressed database does not exist or could not be opened.
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

Signature 
index:texts(
  $db         as xs:string,
  $prefix     as xs:string    := (),
  $ascending  as xs:boolean?  := false()
) as element(value)*
Summary Returns all strings stored in the Text Index of the database $db, along with their number of occurrences.
If $prefix is specified, the returned entries will be refined to the ones starting with that prefix.
If $prefix and $ascending are specified, all nodes will be returned after or before the specified entry.
Errors db:get: The addressed database does not exist or could not be opened.
db:no-index: the index is not available.

index:attributes

Signature 
index:attributes(
  $db         as xs:string,
  $prefix     as xs:string    := (),
  $ascending  as xs:boolean?  := false()
) as element(value)*
Summary Returns all strings stored in the Attribute Index of the database $db, along with their number of occurrences.
If $prefix is specified, the returned entries will be refined to the ones starting with that prefix.
If $prefix and $ascending are specified, all nodes will be returned after or before the specified start entry.
Errors db:get: The addressed database does not exist or could not be opened.
db:no-index: the index is not available.

index:tokens

Signature 
index:tokens(
  $db  as xs:string
) as element(value)*
Summary Returns all strings stored in the Token Index of the database $db, along with their number of occurrences.
Errors db:get: The addressed database does not exist or could not be opened.
db:no-index: the index is not available.

index:element-names

Signature 
index:element-names(
  $db  as xs:string
) as element(value)*
Summary Returns all element names stored in the Name Index of the database $db, along with their number of occurrences.
Errors db:get: The addressed database does not exist or could not be opened.

index:attribute-names

Signature 
index:attribute-names(
  $db  as xs:string
) as element(value)*
Summary Returns all attribute names stored in the Name Index of the database $db, along with their number of occurrences.
Errors db:get: The addressed database does not exist or could not be opened.

Changelog

Version 8.4
Version 7.7
  • Updated: the functions no longer accept Database Nodes as reference. Instead, the name of a database must now be specified.
Version 7.3

The module was introduced with Version 7.1.

Retrieved from "https://old.docs.basex.org/index.php?title=Index_Module&oldid=16500"