This XQuery Module contains functions for handling session information on an HTTP request that has triggered the query. This module is mainly useful in the context of Web Applications.
Conventions
All functions in this module are assigned to the http://basex.org/modules/session
namespace, which must be dynamically imported. In this documentation, the namespace is bound to the session
prefix.
Functions
session:id
Signatures
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session:id() as xs:string
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Summary
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Returns the session ID of a servlet request.
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Examples
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Running a RESTXQ function via http://localhost:8984/restxq/id :
module namespace test = 'http://basex.org/examples/test';
import module namespace session = "http://basex.org/modules/session";
declare %restxq:path("/id") function test:id() {
'Session ID: ' || session:id()
};
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session:attribute-names
Signatures
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session:attribute-names($key as xs:string) as xs:string*
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Summary
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Returns the names of all attributes bound to the current session.
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Examples
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Running the server-side XQuery file attributes.xq via http://localhost:8984/attributes.xq :
import module namespace session = "http://basex.org/modules/session";
session:attributes() ! element attribute { . }
|
session:attribute
Signatures
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session:attribute($key as xs:string) as xs:string?
session:attribute($key as xs:string, $default as xs:string) as xs:string
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Summary
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Returns the value of an attribute bound to the current session. If the attribute does not exist, an empty sequence or the optionally specified default value is returned instead.
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Errors
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BXSE0002 : the value of a session attribute could not be retrieved.
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Examples
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Running the server-side XQuery file get.xq via http://localhost:8984/get.xq?key=user :
import module namespace session = "http://basex.org/modules/session";
'Value of ' || $key || ': ' || session:attribute($key)
|
session:update-attribute
Signatures
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session:update-attribute($key as xs:string, $value as xs:string) as empty-sequence()
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Summary
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Assigns a value to a session attribute.
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Properties
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The function is non-deterministic: evaluation order will be preserved by the compiler.
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Errors
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BXSE0001 : a function item was specified as value of a session attribute.
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Examples
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Running the server-side XQuery file set.xq via http://localhost:8984/set.xq?key=user&value=john :
import module namespace session = "http://basex.org/modules/session";
session:update-attribute($key, $value), 'Attribute was set.'
|
session:delete-attribute
Signatures
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session:delete-attribute($key as xs:string) as empty-sequence()
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Summary
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Deletes a session attribute.
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Properties
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The function is non-deterministic: evaluation order will be preserved by the compiler.
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Errors
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BXSE0001 : a function item was specified as value of a session attribute.
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Examples
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Running the server-side XQuery file delete.xq via http://localhost:8984/delete.xq?key=user :
import module namespace session = "http://basex.org/modules/session";
session:delete-attribute($key), 'Attribute was deleted.'
|
Errors
Code
|
Description
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BXSE0001
|
A function item was specified as value of a session attribute.
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BXSE0002
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An error occurred while retrieving the value of a session attribute.
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Changelog
This module was introduced with Version 7.5.