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C functions for use with MimerSQL?

C functions for use with MimerSQL?

(OP)
Is it possible to use functions written in C as scalar SQL
functions?

I like to include mathematic functions like SIN or EXP, but
I don't want to reinvent the wheel by writing the beast
using SQL. I can't find anything about using C functions
in MimerSQL.

Suppose there's a shared library (or dll) called mymath.so
(mymath.dll) which exports the functions SIN and EXP. Is
there an SQL statement like this:

CREATE FUNCTION SIN(IN X DOUBLE) RETURNS DOUBLE
                LIBRARY 'mymath' NAME 'SIN';

RE: C functions for use with MimerSQL?

It is not possible to add C-functions written in C. All of the normal math functions are already supported however. They are called DSIN, DCOS and so on. The D stands for DOUBLE as the functions both take doubles as arguments and return doubles.

If you are using ODBC you can figure these names out by calling SQLNativeSql with a statement like  "select {fn SIN(1.2)} from t1" which will give you back: "select DSIN(1.2) from t1"

RE: C functions for use with MimerSQL?

(OP)
Hi,

Thank you for the response, so it is possible to use some
math functionality.

Too bad, but I still hope for merging C routines in Mimer.

Unfortunately I am not able to find these functions in the
documentation (.pdf files) yet while looking at the
available functions in the SQL Reference.


Tom

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