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Selecting data from mysql using qt?

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  • D Offline
    D Offline
    doforumda
    wrote on last edited by
    #44

    ok here it is
    @
    root@zafar-laptop:/# /opt/lampp/bin/mysql -u root -p 123456 testTwo
    /opt/lampp/bin/mysql Ver 14.14 Distrib 5.1.41, for pc-linux-gnu (i686) using EditLine wrapper
    Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc.
    This software comes with ABSOLUTELY NO WARRANTY. This is free software,
    and you are welcome to modify and redistribute it under the GPL license
    Usage: /opt/lampp/bin/mysql [OPTIONS] [database]
    -?, --help Display this help and exit.
    -I, --help Synonym for -?
    --auto-rehash Enable automatic rehashing. One doesn't need to use
    'rehash' to get table and field completion, but startup
    and reconnecting may take a longer time. Disable with
    --disable-auto-rehash.
    -A, --no-auto-rehash
    No automatic rehashing. One has to use 'rehash' to get
    table and field completion. This gives a quicker start of
    mysql and disables rehashing on reconnect. WARNING:
    options deprecated; use --disable-auto-rehash instead.
    -B, --batch Don't use history file. Disable interactive behavior.
    (Enables --silent)
    --character-sets-dir=name
    Directory where character sets are.
    --column-type-info Display column type information.
    -c, --comments Preserve comments. Send comments to the server. The
    default is --skip-comments (discard comments), enable
    with --comments
    -C, --compress Use compression in server/client protocol.
    -#, --debug[=#] This is a non-debug version. Catch this and exit
    --debug-check Check memory and open file usage at exit.
    -T, --debug-info Print some debug info at exit.
    -D, --database=name Database to use.
    --default-character-set=name
    Set the default character set.
    --delimiter=name Delimiter to be used.
    -e, --execute=name Execute command and quit. (Disables --force and history
    file)
    -E, --vertical Print the output of a query (rows) vertically.
    -f, --force Continue even if we get an sql error.
    -G, --named-commands
    Enable named commands. Named commands mean this program's
    internal commands; see mysql> help . When enabled, the
    named commands can be used from any line of the query,
    otherwise only from the first line, before an enter.
    Disable with --disable-named-commands. This option is
    disabled by default.
    -g, --no-named-commands
    Named commands are disabled. Use * form only, or use
    named commands only in the beginning of a line ending
    with a semicolon (;) Since version 10.9 the client now
    starts with this option ENABLED by default! Disable with
    '-G'. Long format commands still work from the first
    line. WARNING: option deprecated; use
    --disable-named-commands instead.
    -i, --ignore-spaces Ignore space after function names.

    @

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    • D Offline
      D Offline
      doforumda
      wrote on last edited by
      #45

      @
      --local-infile Enable/disable LOAD DATA LOCAL INFILE.
      -b, --no-beep Turn off beep on error.
      -h, --host=name Connect to host.
      -H, --html Produce HTML output.
      -X, --xml Produce XML output
      --line-numbers Write line numbers for errors.
      -L, --skip-line-numbers
      Don't write line number for errors. WARNING: -L is
      deprecated, use long version of this option instead.
      -n, --unbuffered Flush buffer after each query.
      --column-names Write column names in results.
      -N, --skip-column-names
      Don't write column names in results. WARNING: -N is
      deprecated, use long version of this options instead.
      -O, --set-variable=name
      Change the value of a variable. Please note that this
      option is deprecated; you can set variables directly with
      --variable-name=value.
      --sigint-ignore Ignore SIGINT (CTRL-C)
      -o, --one-database Only update the default database. This is useful for
      skipping updates to other database in the update log.
      --pager[=name] Pager to use to display results. If you don't supply an
      option the default pager is taken from your ENV variable
      PAGER. Valid pagers are less, more, cat [> filename],
      etc. See interactive help (\h) also. This option does not
      work in batch mode. Disable with --disable-pager. This
      option is disabled by default.
      --no-pager Disable pager and print to stdout. See interactive help
      (\h) also. WARNING: option deprecated; use
      --disable-pager instead.
      -p, --password[=name]
      Password to use when connecting to server. If password is
      not given it's asked from the tty.
      -P, --port=# Port number to use for connection or 0 for default to, in
      order of preference, my.cnf, $MYSQL_TCP_PORT,
      /etc/services, built-in default (3306).
      --prompt=name Set the mysql prompt to this value.
      --protocol=name The protocol of connection (tcp,socket,pipe,memory).
      -q, --quick Don't cache result, print it row by row. This may slow
      down the server if the output is suspended. Doesn't use
      history file.
      -r, --raw Write fields without conversion. Used with --batch.
      --reconnect Reconnect if the connection is lost. Disable with
      --disable-reconnect. This option is enabled by default.
      -s, --silent Be more silent. Print results with a tab as separator,
      each row on new line.
      -S, --socket=name Socket file to use for connection.
      --ssl Enable SSL for connection (automatically enabled with
      other flags). Disable with --skip-ssl.
      --ssl-ca=name CA file in PEM format (check OpenSSL docs, implies
      --ssl).
      --ssl-capath=name CA directory (check OpenSSL docs, implies --ssl).
      --ssl-cert=name X509 cert in PEM format (implies --ssl).
      --ssl-cipher=name SSL cipher to use (implies --ssl).
      --ssl-key=name X509 key in PEM format (implies --ssl).
      --ssl-verify-server-cert
      Verify server's "Common Name" in its cert against
      hostname used when connecting. This option is disabled by
      default.
      -t, --table Output in table format.
      --tee=name Append everything into outfile. See interactive help (\h)
      also. Does not work in batch mode. Disable with
      --disable-tee. This option is disabled by default.
      --no-tee Disable outfile. See interactive help (\h) also. WARNING:
      option deprecated; use --disable-tee instead
      -u, --user=name User for login if not current user.
      -U, --safe-updates Only allow UPDATE and DELETE that uses keys.
      -U, --i-am-a-dummy Synonym for option --safe-updates, -U.
      -v, --verbose Write more. (-v -v -v gives the table output format).
      -V, --version Output version information and exit.
      -w, --wait Wait and retry if connection is down.
      --connect_timeout=# Number of seconds before connection timeout.
      --max_allowed_packet=#
      Max packet length to send to, or receive from server
      --net_buffer_length=#
      Buffer for TCP/IP and socket communication
      --select_limit=# Automatic limit for SELECT when using --safe-updates
      --max_join_size=# Automatic limit for rows in a join when using
      --safe-updates
      --secure-auth Refuse client connecting to server if it uses old
      (pre-4.1.1) protocol
      --server-arg=name Send embedded server this as a parameter.
      --show-warnings Show warnings after every statement.

      Default options are read from the following files in the given order:
      /etc/xampp/my.cnf /opt/lampp/etc/my.cnf ~/.my.cnf
      The following groups are read: mysql client
      The following options may be given as the first argument:
      --print-defaults Print the program argument list and exit
      --no-defaults Don't read default options from any options file
      --defaults-file=# Only read default options from the given file #
      --defaults-extra-file=# Read this file after the global files are read

      @

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      • D Offline
        D Offline
        doforumda
        wrote on last edited by
        #46

        @
        Variables (--variable-name=value)
        and boolean options {FALSE|TRUE} Value (after reading options)


        auto-rehash FALSE
        character-sets-dir (No default value)
        column-type-info FALSE
        comments FALSE
        compress FALSE
        debug-check FALSE
        debug-info FALSE
        database (No default value)
        default-character-set latin1
        delimiter ;
        vertical FALSE
        force FALSE
        named-commands FALSE
        ignore-spaces FALSE
        local-infile FALSE
        no-beep FALSE
        host (No default value)
        html FALSE
        xml FALSE
        line-numbers TRUE
        unbuffered FALSE
        column-names TRUE
        sigint-ignore FALSE
        port 3306
        prompt mysql>
        quick FALSE
        raw FALSE
        reconnect TRUE
        socket /opt/lampp/var/mysql/mysql.sock
        ssl FALSE
        ssl-ca (No default value)
        ssl-capath (No default value)
        ssl-cert (No default value)
        ssl-cipher (No default value)
        ssl-key (No default value)
        ssl-verify-server-cert FALSE
        table FALSE
        user root
        safe-updates FALSE
        i-am-a-dummy FALSE
        connect_timeout 0
        max_allowed_packet 16777216
        net_buffer_length 16384
        select_limit 1000
        max_join_size 1000000
        secure-auth FALSE
        show-warnings FALSE

        @

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        • L Offline
          L Offline
          lyuts
          wrote on last edited by
          #47

          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 Offline
            D Offline
            doforumda
            wrote on last edited by
            #48

            whats Dii and where are these instructions?

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            • L Offline
              L Offline
              lyuts
              wrote on last edited by
              #49

              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 Offline
                D Offline
                Dii
                wrote on last edited by
                #50

                lol, don't be write only :)

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

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                • D Offline
                  D Offline
                  Dii
                  wrote on last edited by
                  #51

                  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 Offline
                    D Offline
                    doforumda
                    wrote on last edited by
                    #52

                    sorry i couldnt notice Dii user

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                    • L Offline
                      L Offline
                      lyuts
                      wrote on last edited by
                      #53

                      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 Offline
                        D Offline
                        doforumda
                        wrote on last edited by
                        #54

                        yes i get into mysql command line

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                        • D Offline
                          D Offline
                          doforumda
                          wrote on last edited by
                          #55

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

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                          • D Offline
                            D Offline
                            Dii
                            wrote on last edited by
                            #56

                            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 Offline
                              L Offline
                              lyuts
                              wrote on last edited by
                              #57

                              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 Offline
                                D Offline
                                doforumda
                                wrote on last edited by
                                #58

                                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 Offline
                                  D Offline
                                  Dii
                                  wrote on last edited by
                                  #59

                                  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 Offline
                                    L Offline
                                    lyuts
                                    wrote on last edited by
                                    #60

                                    I think you need to check apostrophes in that command.

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

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                                    • D Offline
                                      D Offline
                                      Dii
                                      wrote on last edited by
                                      #61

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

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                                      • D Offline
                                        D Offline
                                        doforumda
                                        wrote on last edited by
                                        #62

                                        i tried without apostrophes as well but same error

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                                        • D Offline
                                          D Offline
                                          Dii
                                          wrote on last edited by
                                          #63

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

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