Difference between revisions of "Process Module"
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− | |Returns the system property, specified by {{Code|$name}}, or a context parameter with that name (see [[Web_Application#Configuration|Web Applications]]). An empty sequence is returned if the property does not exist. For environment variables of the operating system, please use [https://www.w3.org/TR/xpath-functions-30/#func-environment-variable fn:environment-variable]. | + | |Returns the system property, specified by {{Code|$name}}, or a context parameter of the `web.xml` file with that name (see [[Web_Application#Configuration|Web Applications]]). An empty sequence is returned if the property does not exist. For environment variables of the operating system, please use [https://www.w3.org/TR/xpath-functions-30/#func-environment-variable fn:environment-variable]. |
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| '''Examples''' | | '''Examples''' | ||
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| '''Summary''' | | '''Summary''' | ||
− | |Returns the names of all Java system properties and context parameters (see [[Web_Application#Configuration|Web Applications]]). For environment variables of the operating system, please use [https://www.w3.org/TR/xpath-functions-30/#func-available-environment-variables fn:available-environment-variables]. | + | |Returns the names of all Java system properties and context parameters of the `web.xml` file (see [[Web_Application#Configuration|Web Applications]]). For environment variables of the operating system, please use [https://www.w3.org/TR/xpath-functions-30/#func-available-environment-variables fn:available-environment-variables]. |
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| '''Examples''' | | '''Examples''' |
Revision as of 13:57, 21 September 2015
This XQuery Module provides functions for executing system commands from XQuery.
Contents
Conventions
All functions in this module are assigned to the http://basex.org/modules/proc
namespace, which is statically bound to the proc
prefix.
All errors are assigned to the http://basex.org/errors
namespace, which is statically bound to the bxerr
prefix.
Functions
proc:system
Signatures | proc:system($cmd as xs:string) as xs:string proc:system($cmd as xs:string, $args as xs:string*) as xs:string proc:system($cmd as xs:string, $args as xs:string*, $encoding as xs:string) as xs:string |
Summary | Executes the specified command in a separate process and returns the result as string.$cmd is the name of the command. Arguments to the command may be specified via $args .The result can be explicitly converted to a specified $encoding . If no encoding is specified, the system’s default encoding is used.
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Errors | BXPRnnnn : If the command results in an error, an XQuery error will be raised. Its code will consist of the letters BXPR and four digits with the command’s exit code.BXPR9999 : the specified encoding does not exist or is not supported.
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Examples |
try { proc:system('xyz') } catch bxerr:BXPR0002 { 'Command not found.' } |
proc:execute
Signatures | proc:execute($cmd as xs:string) as element(result) proc:execute($cmd as xs:string, $args as xs:string*) as element(result) proc:execute($cmd as xs:string, $args as xs:string*, $encoding as xs:string) as element(result)
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Summary | Executes the specified command in a separate process and returns the result as element.$cmd is the name of the command. Arguments to the command may be specified via $args .The result can be explicitly converted to a specified $encoding . If no encoding is specified, the system’s default encoding is used.A result has the following structure: <result> <output>...result output...</output> <error>...error output...</error> <code>0</code> </result> |
Errors | BXPR9999 : the specified encoding does not exist or is not supported.
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Examples |
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proc:property
Signatures | proc:property($name as xs:string) as xs:string? |
Summary | Returns the system property, specified by $name , or a context parameter of the `web.xml` file with that name (see Web Applications). An empty sequence is returned if the property does not exist. For environment variables of the operating system, please use fn:environment-variable.
|
Examples |
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proc:property-names
Signatures | proc:property-names() as xs:string* |
Summary | Returns the names of all Java system properties and context parameters of the `web.xml` file (see Web Applications). For environment variables of the operating system, please use fn:available-environment-variables. |
Examples |
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Errors
Code | Description |
---|---|
BXPR9999
|
The specified encoding does not exist or is not supported. |
Changelog
- Version 8.3
- Added: proc:property, proc:property-names.
The module was introduced with Version 7.3.