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    Selecting data from mysql using qt?

    General and Desktop
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    • L
      lyuts last edited by

      Hm, apparently mysql is rather strict in terms of specifying parameters. Try to follow ¤ Dii ¤'s instructions.

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

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      • D
        doforumda last edited by

        whats Dii and where are these instructions?

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        • L
          lyuts last edited by

          Here is his post.

          [quote author="¤ Dii ¤" date="1286874970"]Do it this way, then it will prompt for a password:

          @/opt/lampp/bin/mysql -D testTwo -h localhost -u root -p
          @
          [/quote]

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

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          • D
            Dii last edited by

            lol, don't be write only :)

            /opt/lampp/bin/mysql -D testTwo -h localhost -u root -p

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            • D
              Dii last edited by

              BTW if you do this, AND it's working, you end up in mysql command line interface, you can get out with 'exit'

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              • D
                doforumda last edited by

                sorry i couldnt notice Dii user

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                • L
                  lyuts last edited by

                  Wow, mysql is full of surprises. Never got those with psql. ¤ Dii ¤, does it have \q command?

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

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                  • D
                    doforumda last edited by

                    yes i get into mysql command line

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                    • D
                      doforumda last edited by

                      whats the reason that my database is not opening in qt?

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                      • D
                        Dii last edited by

                        lyuts: yes \q is working too

                        doforumda: ok, so get into the mysql comand line with the command above

                        /opt/lampp/bin/mysql -D testTwo -h localhost -u root -p

                        and then do this:

                        grant all on testTwo.* to 'root'@'localhost' ;

                        Then we have a working mysql, and the rights are granted, we can get back to your Qt program.

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                        • L
                          lyuts last edited by

                          I hope the next post will be like "Hooray, I got it working!!!" :)

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

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                          • D
                            doforumda last edited by

                            there is an error in sql syntax
                            @
                            mysql> grant all on testTwo.* to ‘root’@’localhost’;
                            ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '��root’@’localhost’' at line 1
                            @

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                            • D
                              Dii last edited by

                              Ok, back to your Qt program:

                              @#include <QApplication>
                              #include <QtSql>

                              int main(int argc, char *argv[])
                              {
                              QCoreApplication a(argc, argv);

                              QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
                              db.setDatabaseName("testTwo");
                              db.setUserName("root");
                              db.setPassword("");
                              db.setHostName("localhost");
                              
                              bool ok = db.open();
                              qDebug() << ok;
                              
                              QSqlQuery query;
                              query.exec&#40;"SELECT firstname,lastname FROM testTable"&#41;;
                              while(query.next()) {
                                  QString firstName = query.value(0).toString();
                                  QString secondName = query.value(1).toString();
                                  qDebug() << "First Name: " << firstName << "Last Name:" << secondName;
                                  qDebug() << db.lastError();
                              }
                              return 0;
                              

                              }@

                              Notice, we don't set a password here.
                              The end is 'return 0' instead of 'a.exec()', and it won't hang. The exec() starts the main event loop, and you don't use it here...

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                              • L
                                lyuts last edited by

                                I think you need to check apostrophes in that command.

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

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                                • D
                                  Dii last edited by

                                  ok, you have wrong apostrof type there. I mean this >> '

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                                  • D
                                    doforumda last edited by

                                    i tried without apostrophes as well but same error

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                                    • D
                                      Dii last edited by

                                      nope, you had ` before the root and not '
                                      that was the error

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                                      • D
                                        Dii last edited by

                                        ok, wait a second, I checked it in the meantime and it won't work without password, stay tuned, I post the right command

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                                        • D
                                          doforumda last edited by

                                          you mean like this
                                          grant all on testTwo.* to root@localhost ;
                                          if yes it also displaying same error

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                                          • D
                                            Dii last edited by

                                            so, here we go:

                                            grant all on testTwo.* to 'root'@'localhost' identified by 'password';

                                            Make the right apostrophes! :) You have to set the password in your Qt app too.

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