All Forums Extensibility
Ian Russell 11 posts Joined 08/10
26 Nov 2015
MD5 Message Digest UDF

I am trying to install this downable function for MD5 but get the error below.
https://downloads.teradata.com/download/extensibility/ md5-message-digest-udf
It is a bit old (dates back to 2008) - is it still valid with TD14.10? Is there a new function that replaces it - cannot see it in the Functions manual.
All help gratefully received.
 BTEQ -- Enter your SQL request or BTEQ command:
.run file = hash_md5.btq
.run file = hash_md5.btq
 BTEQ -- Enter your SQL request or BTEQ command:
/* script to install the UDF */

replace TD_SYSFNLIB.function hash_md5
  (arg varchar(32000) character set latin)
  returns char(32) character set latin
  language c
  no sql
  external name 'ci:md5:md5.h:cs:md5:md5.c:cs:md5_latin: udf_md5_latin.c:F:
md5_latin'
  parameter style td_general;
replace TD_SYSFNLIB.function hash_md5
        $
 *** Failure 3706 Syntax error: Expecting the word QUERY.
                Statement# 1, Info =9
 *** Total elapsed time was 1 second.

 BTEQ -- Enter your SQL request or BTEQ command:
 *** Warning: EOF on INPUT stream.
 BTEQ -- Enter your SQL request or BTEQ command:

Fred 1096 posts Joined 08/04
27 Nov 2015

Correct syntax is "replace function databaseName.hash_md5 ..." but you can't add user-defined functions to TD_SYSFNLIB. You could use SYSLIB.

Ian Russell 11 posts Joined 08/10
01 Dec 2015

Thanks Fred - the UDF Manual has the following so was avoiding SYSLIB hence TD_SYSFNLIB. Going to create a project database to hold this one UDF now.
 
Recommendation: In general, you should not create UDFs, UDMs, or external stored
procedures in Teradata system databases such as SYSLIB or SYSUDTLIB. These databases are
primarily used for Teradata system UDFs, UDTs, UDMs, and external stored procedures only,
and they usually contain a large number of these system external routines. Every time you
create, alter, or drop your external routine in these databases, Teradata must relink your
routine to all the objects of the system external routines. In addition, to execute your routine,
Teradata must load all the shared libraries referenced by the system external routines, and
these libraries may not be related to your routine. This is very inefficient. However, note that
there are cases where you have to create your UDF in a system database. For example, UDFs
used for row level security must reside in the SYSLIB database.
 

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