Difference between revisions of "REQUIRE ONCE()"

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Add class library loading
 
 
 
 
 
==Purpose==
 
==Purpose==
Load an API library file built with the Recital SDK or a Recital/4GL procedure library
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Load a Recital class or procedure library or a C extension library built with the Recital API
  
  
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==See Also==
 
==See Also==
[[CLOSE PROCEDURE]], [[DO]], [[FUNCTION]], [[LINK]], [[LIST PROCEDURE]], [[PARAMETERS]], [[PROCEDURE]], [[RELEASE LIBRARY]], [[REQUIRE()]], [[SET LIBRARY]]
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[[ACLASS()]], [[ADDPROPERTY()]], [[AMEMBERS()]], [[CLASS]], [[CLASS - Methods]], [[CLASS - Parameters]], [[CLASS - Properties]], [[CLASS - Scoping]], [[CLOSE PROCEDURE]], [[COMPOBJ()]], [[CREATEOBJECT()]], [[DEFINE CLASS]], [[DISPLAY CLASSES]], [[DO]], [[DODEFAULT()]], [[FOREACH]], [[FUNCTION]], [[INCLUDE()]], [[INCLUDE_ONCE()]], [[LINK]], [[LIST CLASSES]], [[LIST PROCEDURE]], [[LOADOBJECT()]], [[METHOD]], [[NEWOBJECT()]], [[OBJECT()]], [[PARAMETERS]], [[PRINT_HTML()]], [[PRINT_JSON()]], [[PRINT_R()]], [[PRINT_XML()]], [[PROCEDURE]], [[REMOVEPROPERTY()]], [[REQUIRE()]], [[SAVEOBJECT()]], [[SQL SELECT]], [[SET CLASSLIBRARY]], [[SET LIBRARY]], [[SET PROCEDURE]], [[WITH]]
  
  
 
==Description==
 
==Description==
The REQUIRE_ONCE() function opens the specified API or 4GL procedure library file if it is not already open, scans the contents of it, and records the names and positions of the procedures defined within it.  The <expC> is the name of the library file.  If the file extension is not stated, '.dll' is assumed on Windows and '.so' on UNIX/Linux.  To load a 4GL library file, the '.prg' or '.dbo' file extension must be included.  You can place as many procedures as you want in a procedure library file. By default, library files are loaded from the sharedlib directory: usually <Program Files>Recitalsharedlib on Windows and /usr/recital/sharedlib on UNIX/Linux, but defined in the DB_LIBDIR Registry setting / environment variable.  To load a library that is not in the current directory or the sharedlib directory, the full path must be included.
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The REQUIRE_ONCE() function opens the specified Recital class or procedure library or C Extensions library file if it is not already open, scans the contents of it, and records the names and positions of the procedures and/or classes defined within it.  The <expC> is the name of the library file.  If the file extension is not stated, '.so' is assumed on UNIX/Linux.  To load a Recital procedure or class library file, the '.prg' or '.dbo' file extension must be included.  To load a library that is not in the current directory, the full path must be included.  You can place as many classes or procedures as you want in a library file.
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C Extensions libraries in the shared library directory are loaded automatically at the start of a Recital process.  The shared library directory location is defined by the DB_LIBDIR environment variable in the [[Configuration Files|recital.conf]] file.
  
The SET LIBRARY TO command, without any filename specified, closes all active API procedure library files.  A closed library file discards any knowledge of where the procedures within reside.  The RELEASE LIBRARY <library filename> command can be used to close an individual API library file.
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The SET LIBRARY TO command, without any filename specified, closes all active C Extensions library files.  A closed library file discards any knowledge of where the procedures within reside.  The RELEASE LIBRARY <library filename> command can be used to close an individual C Extensions library file.
  
The SET PROCEDURE and CLOSE PROCEDURE commands can also be used to handle Recital/4GL procedure library files.
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The SET PROCEDURE and CLOSE PROCEDURE commands can also be used to handle Recital procedure library files.
  
 
The active procedures and functions can be listed with the LIST or DISPLAY PROCEDURE commands.
 
The active procedures and functions can be listed with the LIST or DISPLAY PROCEDURE commands.
  
For full details on using the Recital SDK, please see the SDK documentation.
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For full details on using the Recital C Extensions API, please see the [[:Category:SDK|C Extensions API documentation]].
  
  
 
==Example==
 
==Example==
 
<code lang="recital">
 
<code lang="recital">
// Open Samples.so API procedure library
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// Open Samples.so C extension API procedure library
 
require_once("Samples")
 
require_once("Samples")
// Close pdf.so API procedure library
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// Close pdf.so C extension API procedure library
 
release library pdf.so
 
release library pdf.so
// Close all active API procedure library files
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// Close all active C extension API procedure library files
 
set library to
 
set library to
 
</code>
 
</code>
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==Products==
 
==Products==
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
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Recital, Recital Server
 
[[Category:Documentation]]
 
[[Category:Documentation]]
 
[[Category:Functions]]
 
[[Category:Functions]]
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[[Category:Objects]]
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[[Category:Objects Commands]]
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[[Category:SDK]]
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[[Category:Applications]]
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[[Category:Applications Commands]]

Latest revision as of 14:01, 12 March 2010

Purpose

Load a Recital class or procedure library or a C extension library built with the Recital API


Syntax

REQUIRE_ONCE(<expC>)


See Also

ACLASS(), ADDPROPERTY(), AMEMBERS(), CLASS, CLASS - Methods, CLASS - Parameters, CLASS - Properties, CLASS - Scoping, CLOSE PROCEDURE, COMPOBJ(), CREATEOBJECT(), DEFINE CLASS, DISPLAY CLASSES, DO, DODEFAULT(), FOREACH, FUNCTION, INCLUDE(), INCLUDE_ONCE(), LINK, LIST CLASSES, LIST PROCEDURE, LOADOBJECT(), METHOD, NEWOBJECT(), OBJECT(), PARAMETERS, PRINT_HTML(), PRINT_JSON(), PRINT_R(), PRINT_XML(), PROCEDURE, REMOVEPROPERTY(), REQUIRE(), SAVEOBJECT(), SQL SELECT, SET CLASSLIBRARY, SET LIBRARY, SET PROCEDURE, WITH


Description

The REQUIRE_ONCE() function opens the specified Recital class or procedure library or C Extensions library file if it is not already open, scans the contents of it, and records the names and positions of the procedures and/or classes defined within it. The <expC> is the name of the library file. If the file extension is not stated, '.so' is assumed on UNIX/Linux. To load a Recital procedure or class library file, the '.prg' or '.dbo' file extension must be included. To load a library that is not in the current directory, the full path must be included. You can place as many classes or procedures as you want in a library file.

C Extensions libraries in the shared library directory are loaded automatically at the start of a Recital process. The shared library directory location is defined by the DB_LIBDIR environment variable in the recital.conf file.

The SET LIBRARY TO command, without any filename specified, closes all active C Extensions library files. A closed library file discards any knowledge of where the procedures within reside. The RELEASE LIBRARY <library filename> command can be used to close an individual C Extensions library file.

The SET PROCEDURE and CLOSE PROCEDURE commands can also be used to handle Recital procedure library files.

The active procedures and functions can be listed with the LIST or DISPLAY PROCEDURE commands.

For full details on using the Recital C Extensions API, please see the C Extensions API documentation.


Example

// Open Samples.so C extension API procedure library
require_once("Samples")
// Close pdf.so C extension API procedure library
release library pdf.so
// Close all active C extension API procedure library files
set library to


Products

Recital, Recital Server