Selecting data from mysql using qt?

lyuts · wrote on 12 Oct 2010, 11:01

Solution 1:
@find /opt/lampp -name '*.log'@
This might need sudo'ing.

Solution 2:
If 1st fails then you need to find the config files for mysql (it should be located in /opt/lampp directory) and try to find out what is the location of mysql's log files.

doforumda · wrote on 12 Oct 2010, 11:03

there are 6 files in there but no mysql.log

these are the files
access_log, cgisock.1693, error_log, httpd.pid, php_error_log, ssl_request_log

Dii · wrote on 12 Oct 2010, 11:04

Don't bother with the log files, I guess Qt looks at the wrong place for the socket file...

Let's check this line in your mysql config file (my.cnf):

socket = /var/run/mysqld/mysqld.sock

You should find my.cnf in /etc/ or /etc/mysql/ ... I don't know ubuntu that much.

doforumda · wrote on 12 Oct 2010, 11:05

1st solution returns this
@
root@zafar-laptop:/# find /opt/lampp -name *.log
/opt/lampp/htdocs/xampp/contrib/sqlnet.log
@

doforumda · wrote on 12 Oct 2010, 11:07

with which editor i can view that .conf file. with gedit or something.

lyuts · wrote on 12 Oct 2010, 11:07

[quote author="¤ Dii ¤" date="1286881470"]
You should find my.cnf in /etc/ or /etc/mysql/ ... I don't know ubuntu that much.[/quote]

I don't think that this config will be in /etc. He uses lampp - a preconfigured bundle. That config might be in /opt/lampp.

Dii · wrote on 12 Oct 2010, 11:08

BTW a quick sum:

mysql is installed
database and tables are created
access is granted
qt code looks fine

I see two possibilities here: libmysqlclient is missing, or the socket file is at different place.

doforumda · wrote on 12 Oct 2010, 11:09

the file my.cnf is in etc/mysql folder

Dii · wrote on 12 Oct 2010, 11:10

doforumda: use gedit

sudo gedit /etc/mysql/my.cnf

at least most of the ubuntu machines have the config file there.

doforumda · wrote on 12 Oct 2010, 11:10

this is the socket line in my.cnf

@
socket = /var/run/mysqld/mysqld.sock
@

Dii · wrote on 12 Oct 2010, 11:13

ok then the wrong socket guess was wrong... but let's make it sure:

sudo ls -l /var/run/mysqld/*

doforumda · wrote on 12 Oct 2010, 11:16

after running this sudo ls -l /var/run/mysqld/* there is nothing inside run directory

Dii · wrote on 12 Oct 2010, 11:20

uhmmmmmmm that's more than strange, the socket file should be there somewhere, let's find it:

find /var -name mysqld.sock

if no result:

find /opt -name mysqld.sock

doforumda · wrote on 12 Oct 2010, 11:23

both of them didnt return any resutl

@
root@zafar-laptop:/# find /var -name mysqld.sock
root@zafar-laptop:/# find /opt -name mysqld.sock
root@zafar-laptop:/#
@

lyuts · wrote on 12 Oct 2010, 11:27

I have bitnami lampp stack installed and when I start it then the socket file is created in /opt/lamppstack/mysql/tmp/mysql.sock. I think doforumda shoudl have similar directory and we need to check the permissions for that directory.

Dii · wrote on 12 Oct 2010, 11:28

Usually that means, that the mysql daemon is not running... but the the command line should not work as well... ;(

It doesn't hurt to try to start the daemon:

sudo /etc/init.d/mysql start

... and do the search for the socket file as above.

Dii · wrote on 12 Oct 2010, 11:29

gosh, do the find with sudo:

sudo find /opt -name mysqld.sock
sudo find /var -name mysqld.sock

damn, I always forget that with ubuntu

Dii · wrote on 12 Oct 2010, 11:30

lyuts: yes, if he have the socket file at the same place, we need to symlink it to the /var/... location and happy end :) I hope so.

doforumda · wrote on 12 Oct 2010, 11:31

tyut: yes i have one file with the name of mysql.sock in /opt/lampp/var/mysql/mysql.sock

doforumda · wrote on 12 Oct 2010, 11:36

the permissions on mysql.sock it read write exe for all types of users