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    Call for Presentations - Qt World Summit

    Selecting data from mysql using qt?

    General and Desktop
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    • D
      doforumda last edited by

      how can i check that mysql logs and from where?

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      • L
        lyuts last edited by

        [quote author="doforumda" date="1286880547"]how can i check that mysql logs and from where? [/quote]

        Try to find them:
        @find /opt/lampp -name log -type d@

        When you find the log directory, find a log for mysql and use tail utility:

        @tail -f /path/to/mysql.log@

        I'm a rebel in the S.D.G.

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        • D
          doforumda last edited by

          this command didnt return something
          @
          root@zafar-laptop:/# find /opt/lampp -name log -type d
          root@zafar-laptop:/#
          @

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          • D
            doforumda last edited by

            i have a folder inside lampp with the name logs. is it the one which your are talking about

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            • L
              lyuts last edited by

              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.

              I'm a rebel in the S.D.G.

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              • D
                doforumda last edited by

                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

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                • D
                  Dii last edited by

                  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.

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                  • D
                    doforumda last edited by

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

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                    • D
                      doforumda last edited by

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

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                      • L
                        lyuts last edited by

                        [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.

                        I'm a rebel in the S.D.G.

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                        • D
                          Dii last edited by

                          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.

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                          • D
                            doforumda last edited by

                            the file my.cnf is in etc/mysql folder

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                            • D
                              Dii last edited by

                              doforumda: use gedit

                              sudo gedit /etc/mysql/my.cnf

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

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                              • D
                                doforumda last edited by

                                this is the socket line in my.cnf

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

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                                • D
                                  Dii last edited by

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

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

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                                  • D
                                    doforumda last edited by

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

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                                    • D
                                      Dii last edited by

                                      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

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                                      • D
                                        doforumda last edited by

                                        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:/#
                                        @

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                                        • L
                                          lyuts last edited by

                                          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.

                                          I'm a rebel in the S.D.G.

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                                          • D
                                            Dii last edited by

                                            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.

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