Difference between revisions of "Sessions Module"
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* In this documentation, the namespace is bound to the {{Code|sessions}} prefix. | * In this documentation, the namespace is bound to the {{Code|sessions}} prefix. | ||
− | * Errors are assigned to the | + | * Errors are assigned to the <code><nowiki>http://basex.org/errors</nowiki></code> namespace, which is statically bound to the {{Code|bxerr}} prefix. |
* If any of the functions is called outside the servlet context, the error {{Error|BXSE0003|#Errors}} is raised. | * If any of the functions is called outside the servlet context, the error {{Error|BXSE0003|#Errors}} is raised. | ||
* As sessions are side-effecting operations, all functions are flagged as ''non-deterministic''. This means that the functions will not be reordered by the compiler. | * As sessions are side-effecting operations, all functions are flagged as ''non-deterministic''. This means that the functions will not be reordered by the compiler. |
Revision as of 17:27, 7 April 2015
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.
Contents
Conventions
- The
basex-api
package must be included in the classpath. This is always the case if you use one of the complete distributions (zip, exe, war) of BaseX. - All functions are assigned to the
http://basex.org/modules/sessions
namespace. The module must be imported in the query prolog:
import module namespace sessions = "http://basex.org/modules/sessions"; ...
- In this documentation, the namespace is bound to the
sessions
prefix. - Errors are assigned to the
http://basex.org/errors
namespace, which is statically bound to thebxerr
prefix. - If any of the functions is called outside the servlet context, the error
BXSE0003
: is raised. - As sessions are side-effecting operations, all functions are flagged as non-deterministic. This means that the functions will not be reordered by the compiler.
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 variables bound to the session specified by $id .
|
sessions:get
Signatures | sessions:get($id as xs:string, $key as xs:string) as xs:string? sessions:get($id as xs:string, $key as xs:string, $default as xs:string) as xs:string
|
Summary | Returns the value of a variable bound to the session specified by $id . If the variable does not exist, an empty sequence or the optionally specified default value is returned instead.
|
Errors | BXSE0002 : the value of a session variable could not be retrieved.
|
sessions:set
Signatures | sessions:set($id as xs:string, $key as xs:string, $value as xs:string) as empty-sequence()
|
Summary | Assigns a value to a variable bound to the session specified by $id .
|
Errors | BXSE0001 : a function item was specified as value of a session variable.
|
sessions:delete
Signatures | sessions:delete($id as xs:string, $key as xs:string) as empty-sequence()
|
Summary | Deletes a variable bound to the session specified by $id .
|
sessions:close
Signatures | sessions:close($id as xs:string) as empty-sequence()
|
Summary | Unregisters the session specified by $id .
|
Errors
Code | Description |
---|---|
BXSE0001
|
A function item was specified as value of a session attribute. |
BXSE0002
|
An error occurred while retrieving the value of a session attribute. |
BXSE0003
|
A function was called outside the servlet context. |
BXSE0004
|
The specified session was not found. |
Changelog
This module was introduced with Version 7.5.