Difference between revisions of "Session Module"
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|- | |- | ||
| '''Examples''' | | '''Examples''' | ||
− | | | + | |Running a server-side XQuery expression via <code><nowiki>http://localhost:8984/set.xq?key=user&value=john</nowiki></code>: |
<pre class="brush:xquery"> | <pre class="brush:xquery"> | ||
+ | import module namespace session = "http://basex.org/modules/session"; | ||
− | |||
session:update-attribute($key, $value), | session:update-attribute($key, $value), | ||
'Attribute was set.' | 'Attribute was set.' |
Revision as of 05:41, 9 September 2012
This XQuery Module contains functions for handling session information on an HTTP request that has triggered the query. This module is mainly useful in the context of Web Applications.
Contents
Conventions
All functions in this module are assigned to the http://basex.org/modules/session
namespace, which must be dynamically imported. In this documentation, the namespace is bound to the session
prefix.
Functions
session:id
Signatures | session:id() as xs:string
|
Summary | Returns the session ID of a servlet request. |
Examples | The following RESTXQ function can be called via http://localhost:8984/restxq/id :
module namespace test = 'http://basex.org/examples/test'; import module namespace session = "http://basex.org/modules/session"; declare %restxq:path("/id") function test:id() { 'Session ID: ' || session:id() }; |
session:attribute
Signatures | session:attribute($key as xs:string) as xs:string? session:attribute($key as xs:string, $default as xs:string) as xs:string
|
Summary | Returns the value of an attribute bound to the current session. If the attribute does not exist, an empty sequence or the optionally specified default value is returned instead. |
Errors | BXSE0002 : the value of a session attribute could not be retrieved.
|
Examples | The following RESTXQ function can e.g. be called via http://localhost:8984/restxq/get?key=user :
module namespace test = 'http://basex.org/examples/test'; import module namespace session = "http://basex.org/modules/session"; declare %restxq:path("/get") %restxq:query-param("key", "{$key}", "") function test:get($key) { 'Value of ' || $key || ': ' || session:attribute($key) }; |
session:update-attribute
Signatures | session:update-attribute($key as xs:string, $value as xs:string) as empty-sequence()
|
Summary | Assigns a value to a session attribute. |
Properties | The function is non-deterministic: evaluation order will be preserved by the compiler. |
Errors | BXSE0001 : a function item was specified as value of a session attribute.
|
Examples | Running a server-side XQuery expression via http://localhost:8984/set.xq?key=user&value=john :
import module namespace session = "http://basex.org/modules/session"; session:update-attribute($key, $value), 'Attribute was set.' |
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. |
Changelog
This module was introduced with Version 7.5.