Difference between revisions of "Sessions Module"

From BaseX Documentation
Jump to navigation Jump to search
Line 4: Line 4:
  
 
* The module will be available if the {{Code|basex-api}} library is found in the classpath. This is the case if you use one of the complete distributions of BaseX (zip, exe, war).
 
* The module will be available if the {{Code|basex-api}} library is found in the classpath. This is the case if you use one of the complete distributions of BaseX (zip, exe, war).
* All functions and errors are assigned of the <code><nowiki>http://basex.org/modules/sessions</nowiki></code> namespace, which is statically bound to the {{Code|sessions}} prefix. Prior to {{Version|9.2}}, the module needed to be imported in the query prolog:
+
* All functions and errors are assigned of the <code><nowiki>http://basex.org/modules/sessions</nowiki></code> namespace, which is statically bound to the {{Code|sessions}} prefix.
<pre class="brush:xquery">
 
import module namespace sessions = "http://basex.org/modules/sessions";
 
...
 
</pre>
 
 
* If any of the functions is called outside the servlet context, <code>[[XQuery Errors#BaseX Errors|basex:http]]</code> is raised.
 
* If any of the functions is called outside the servlet context, <code>[[XQuery Errors#BaseX Errors|basex:http]]</code> is raised.
 
* If a specified session id is not found, <code>[[#Errors|not-found]]</code> is raised.
 
* If a specified session id is not found, <code>[[#Errors|not-found]]</code> is raised.

Revision as of 06:53, 29 November 2019

This XQuery Module can only be called from users with Admin permissions. It contains functions for accessing and modifying all registered server-side sessions. This module is mainly useful in the context of Web Applications.

Conventions

  • The module will be available if the basex-api library is found in the classpath. This is the case if you use one of the complete distributions of BaseX (zip, exe, war).
  • All functions and errors are assigned of the http://basex.org/modules/sessions namespace, which is statically bound to the sessions prefix.
  • If any of the functions is called outside the servlet context, basex:http is raised.
  • If a specified session id is not found, not-found is raised.
  • As sessions are side-effecting operations, all functions are flagged as non-deterministic. As a result, some query optimizations will be suppressed.

Functions

sessions:ids

Signatures sessions:ids() as xs:string*
Summary Returns the IDs of all registered sessions.

sessions:created

Signatures sessions:created($id as xs:string) as xs:dateTime
Summary Returns the creation time of the session specified by $id.

sessions:accessed

Signatures sessions:accessed($id as xs:string) as xs:dateTime
Summary Returns the last access time of the session specified by $id.

sessions:names

Signatures sessions:names($id as xs:string) as xs:string*
Summary Returns the names of all attributes bound to the session specified by $id.

sessions:get

Updated with Version 9.3: Values that have no XQuery type will be returned as strings.

Signatures sessions:get($id as xs:string, $name as xs:string) as item()*
sessions:get($id as xs:string, $name as xs:string, $default as item()*) as item()*
Summary Returns the value of an attribute with the specified $name from the session with the specified $id. If the attribute is unknown, an empty sequence or the optionally specified $default value will be returned instead.

sessions:set

Signatures sessions:set($id as xs:string, $name as xs:string, $value as item()*) as empty-sequence()
Summary Returns the specified value to the attribute with the specified $name from the session with the specified $id.
Errors set: The supplied value cannot be materialized.

sessions:delete

Signatures sessions:delete($id as xs:string, $name as xs:string) as empty-sequence()
Summary Deletes an attribute with the specified $name from the session with the specified $id.

sessions:close

Signatures sessions:close($id as xs:string) as empty-sequence()
Summary Unregisters the session specified by $id.

Errors

Code Description
set The supplied value cannot be materialized.
not-found The specified session was not found.

Changelog

Version 9.3
  • Updated: sessions:get: Values that have no XQuery type will be returned as strings.
Version 9.0
  • Updated: error codes updated; errors now use the module namespace
Version 8.4
  • Updated: Allow sequences as session values.

This module was introduced with Version 7.5.