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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

      [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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                                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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                                          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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                                          • D
                                            Dii last edited by

                                            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

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