Comments on: Installing the median user defined function on MySQL

By: moore

moore — Mon, 23 May 2011 03:59:49 +0000

Thanks Jeff!

By: Jeff Beard

Jeff Beard — Sat, 21 May 2011 21:22:07 +0000

Dan,

Here’s my blog post about udf_median on 64bit Windows 7 for you and the folks that refer to this post:

http://jeffbeard.org/2011/05/mysql-udf_median-on-windows-7-64bit/

By: Ven

Ven — Tue, 22 Feb 2011 07:38:07 +0000

I am trying to compile using the command: gcc -shared -lstdc++ -I /usr/include -I /usr/local/include -I /usr/local/mysql/include/ -o udf_median.so udf_median.cc on Mac OS X 10.4.11. I get the following error:

i686-apple-darwin8-gcc-4.0.1: unrecognized option ‘-shared’
/usr/bin/ld: Undefined symbols:
_main
collect2: ld returned 1 exit status

The Darwin kernel version is 8.11.1. Any thoughts?

By: moore

moore — Mon, 06 Dec 2010 23:25:09 +0000

Has anyone managed to get this UDF to work with Windows 7? I tried, but couldn’t get it working, and would love any tips.

By: moore

moore — Mon, 25 Oct 2010 15:02:32 +0000

Thanks Thomas!

By: Thomas

Thomas — Tue, 12 Oct 2010 15:55:54 +0000

This was really helpful.

BTW:
If anyone encounters the following error(ubuntu) while trying to insert the UDF in mysql:
“failed to map segment from shared object: Permission denied”

you can fix it by stop apparmor
cd /etc/init.d/
./apparmor stop

then insert the udf and
./apparmor start

Thanks!

By: moore

moore — Sun, 16 May 2010 16:51:25 +0000

Thanks for the additional instructions, Dave!

By: Dave

Dave — Sun, 09 May 2010 00:31:23 +0000

Thank you!

For what it’s worth, here are the instructions I used on Kubuntu Linux, after installing MySQL and its development libraries:

for i in *.cc; do
gcc -Wall -fPIC -DHAVE_DLOPEN -I/usr/include/mysql -c $i -o $(basename $i .cc).o;
ld -shared -o $(basename $i .cc).so $(basename $i .cc).o;
done

This way you install everything and don’t have to comment out any flags. Use the -D parameter to set the flag while compiling. Then you can do:

CREATE AGGREGATE FUNCTION slope RETURNS REAL SONAME ‘udf_slope.so’;

And it worked for me!

By: moore

moore — Fri, 12 Feb 2010 21:11:49 +0000

Hi Jo Yo,

JsMap looks really cool!

Thanks.

By: Jo Yo

Jo Yo — Fri, 12 Feb 2010 20:57:13 +0000

I’m working on JsReduce which is going to be a special aggregate function. I have JsMap working and you can check it out now: http://bit.ly/cKA8np

Ideally, this will be ultra flexible for prototyping reports and getting things done.