EDN InterBase / Design / UDF Feed http://edn.embarcadero.com/interbase/design/udf 2013-05-24T12:32:58-07:00 1 Starting transactions in Stored Procedures and User Defined Functions Ben Matterson http://gp.codegear.com/authors/edit/581.aspx http://edn.embarcadero.com/article/29888 2003-03-31T00:00:00-07:00 2003-03-31T00:00:00-07:00 A brief explanation why you cannot start transactions in stored procedures and user defined functions. Managing a birthday calendar with InterBase Marco Hemmes http://gp.codegear.com/authors/edit/11278.aspx http://edn.embarcadero.com/article/27203 2001-08-28T15:20:50-07:00 2001-08-28T15:20:50-07:00 User-defined functions are the key to remembering everyone's natal anniversary. By Marco Hemmes. Writing Clean and Safe UDFs in Delphi Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25920 2000-09-26T00:00:00-07:00 2000-09-26T00:00:00-07:00 This article assumes the reader understands Delphi well enough to know how to create a DLL--We will demonstrate how to create UDFs, not DLLs. Passing and Returning Dates to a Delphi-created UDF Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25103 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 A Protection Exception or erroneous results may occur if special precautions are not taken How to use the udflib.c supplied in the IB V4.x examples directory. Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25181 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 How to compile the udf example shipped with the 4.x kits. Rounding numerical values in a stored procedure Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25282 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 A UDF is the best way to round a numeric value to an integer SCH_validate errors appear in interbase.log file Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25329 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 SCH_validate errors are internal server errors that are related to InterBase's internal scheduler. Into which directory do I put UDF DLLs (Windows platforms) Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25331 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 InterBase uses the Win32 API function: LoadLibrary to load a UDF. Compiling UDFs on Unix Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25366 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 Example for compiling a UDF under Solaris Information on how to use the dow() UDF Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25445 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 Getting the error .."error 171: function dow() could not be matched.. Diagnostic Steps to Try When InterBase Will Not Recognize a UDF Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25454 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 5 different potental reasons for this error Is it possible to access data from the database within a UDF? Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25464 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 Although it is possible to access data from a UDF, it is not recommended. Can UDF's Add Results From More Than One Record? Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25489 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 UDF cannot remember the answer from a previous record Where to find information on building a shared library on SCO 5 Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25519 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 A UDF on any platform is just a shared library. Returning thread-safe values from an UDF Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25593 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 There are three ways to manage thread-local storage when returning values from a UDF. Creating UDFs in Delphi Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25624 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 This paper will provide step by step instructions for creating a UDF in Delphi. Defining maximum size of a string argument passed to a UDF Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25702 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 You must account for the null character at the end of the string. Declaring InterBase UDF's in the Database Desktop Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25705 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 One external function may be declared at a time in the SQL editor Trying to group by a UDF return value Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25711 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 Grouping is only allowed field values stored in a table BLR errors when running UDF's from ib_udf.dll Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25732 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 IB_UDF.DLL relies on IB_UTIL.DLL An example of how to use UDF's with the SCO version of InterBase 5.5 for SCO OpenServer Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25736 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 In order to use UDF libraries with the InterBase 5.5 version for SCO OpenServer several<br>steps are required. Some of the issues are not obvious. "arithmatic exception, numeric overflow or string truncation" with UDFs in version 5.5 Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25767 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 The way of handling terminator is changed from version 5.1 to version 5.5. Declaring a blob UDF Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25786 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 Declaring a blob UDF The code attempted to access a virtual address without privilege to do so Borland Staff http://gp.codegear.com/authors/edit/46.aspx http://edn.embarcadero.com/article/25833 2000-07-24T00:00:00-07:00 2000-07-24T00:00:00-07:00 If Delphi UDF, make sure ismultithreaded := true is included in the main project file. Writing UDFs for InterBase Using Delphi and C++Builder Conference Speaker http://gp.codegear.com/authors/edit/589.aspx http://edn.embarcadero.com/article/27204 2000-07-12T00:00:00-07:00 2000-07-12T00:00:00-07:00 A complete demonstration of how to write UDFs using Delphi and C++Builder. Unix and Windows platforms will be discussed. Writing UDFs for InterBase under Windows and Linux Conference Speaker http://gp.codegear.com/authors/edit/589.aspx http://edn.embarcadero.com/article/27134 1999-07-21T00:00:00-07:00 1999-07-21T00:00:00-07:00 A user defined function (UDF) in InterBase is merely a function written in any programming language that is compiled into a shared library.