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    Call for Presentations - Qt World Summit

    Selecting data from mysql using qt?

    General and Desktop
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    • L
      lyuts last edited by

      Take a look into mysql logs to see what happens when you are trying to connect from your application.

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

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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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