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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

      any clues?

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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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