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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

      Change the 19th line to

      @QSqlQuery query(db);@

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

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      • D
        doforumda last edited by

        same error again

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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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