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Calling a UDF via a Trigger

Posted on 2006-07-19
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Last Modified: 2013-12-09
Hi

I have installed a UDF dll on my firebird database, however i am unsure how to call it.

The UDF creates a text file to a location, and is called FILE_WRITE:

DECLARE EXTERNAL FUNCTION FILE_WRITE
    CSTRING (1024),
    CSTRING (1024)
    RETURNS INTEGER BY VALUE
    ENTRY_POINT 'File_write' MODULE_NAME 'udf_file.dll';


Could someone please advise on the syntax of calling a UDF via a trigger please?

Many thanks
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Question by:seancurt
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1 Comment
 
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NickUpson earned 500 total points
ID: 17137399
without knowing the meaning of the args it's a little difficult to do a good example but you treat any udf as if it were a built-in function like lower

e.g.

int return_val;
select file_write('path_of_file', 'value to add to file') from rdb$database into :return_val;
if (return_val <> 0) then
 do_something about failure;


rdb$database always has only one row
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