Database Module

This module contains XQuery Functions to list and open databases, explicitly apply available index structures, or get information on the database structure. All functions are introduced with the db: prefix, which is linked to the http://www.basex.org/db namespace.

db:system

Signatures	db:system() as xs:string
Summary	Prints information about the database system, including the database path and current database settings.

db:list

Signatures	db:list() as xs:string* db:list($path as xs:string) as xs:string*
Summary	Returns an xs:string sequence with the names of all databases. If an argument is specified, all documents of the specified database or database path are returned.

db:open

Signatures	db:open($name as xs:string) as document-node()*
Summary	Returns a sequence with all document nodes contained in the database specified by $name. The name of the database may be extended by a collection path.
Errors	BASX0003 is raised if the database is not found.
Examples	db:open("docs") returns all documents from the database named docs. db:open("docs/one") returns all documents from the database named docs in the subpath one.

db:open-pre

Signatures	db:open-pre($name as xs:string, $pre as xs:integer) as node()
Summary	Opens the database specified by $name and returns the node with the specified $pre value.
Errors	BASX0004 is raised if the specified $pre value does not exist in the database.
Examples	db:open-pre("docs", 0) returns the first database node from the database named docs.

db:open-id

Signatures	db:open-id($name as xs:string, $id as xs:integer) as node()
Summary	Opens the database specified by $name and returns the node with the specified $id value. In contrast to the pre value, the id will remain valid after update operations.
Errors	BASX0004 is raised if the specified $id does not exist in the database.

db:node-pre

Signatures	db:node-pre($nodes as node()*) as xs:integer*
Summary	Returns the pre values of all database nodes specified by $nodes. pre values are direct, internal pointers to database nodes, which might be changed by updates.
Examples	db:node-pre(doc("input")) returns 0 if the database input contains a single document.

db:node-id

Signatures	db:node-id($nodes as node()*) as xs:integer*
Summary	Returns the id values of all database nodes specified by $nodes. id values are pointers to database nodes, which are not changed by updates.

db:text

Signatures	db:text($name as xs:string, $string as item()) as text()*
Summary	Returns all text nodes that have $string as their string value.
Examples	db:text("DB", "QUERY")/.. returns the parents of all text nodes of the database DB that match the string QUERY.

db:attribute

Signatures	db:attribute($name as xs:string, $string as item()) as attribute()* db:attribute($name as xs:string, $string as item(), $attname as xs:string) as attribute()*
Summary	Returns all attribute nodes that have $string as their string value. If $attname is specified, the resulting attribute nodes are filtered by their attribute name.
Examples	db:attribute("DB", "QUERY", "id")/.. returns the parents of all id attribute nodes of the database DB that have QUERY as string value.

db:fulltext

Signatures	db:fulltext($name as xs:string, $text as xs:string) as text()
Summary	Returns all text nodes from the full-text index that contain the string $text. The index full-text options are used for searching, i.e., if the index terms have been stemmed, the search string will be stemmed as well.
Errors	BASX0001 is raised if the index is not available.
Examples	db:fulltext("DB", "QUERY") returns all text nodes of the database DB that contain the string QUERY.

db:info

Signatures	db:info($name as xs:string) as xs:string db:info($name as xs:string, $type as xs:string) as xs:string
Summary	Returns information for a database. If $type is specified, the function returns information on a database index. It must be one of the values TEXT, ATTRIBUTE, FULLTEXT, PATH, TAG, or ATTNAME.
Errors	BASX0001 is raised if the specified index is not available.