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  4. [SOLVED] Exec full script by QSqlDatabase

[SOLVED] Exec full script by QSqlDatabase

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  • M Offline
    M Offline
    maxim.prishchepa
    wrote on 5 Jul 2011, 07:31 last edited by
    #1

    Hi, dose any body can say me, what i do wrong?
    I have DB SQLite, and create DB like this:
    @m_database->m_db = QSqlDatabase::addDatabase("QSQLITE");@
    then, i wont exec a sql script witch create a tables and data in this tables, but when i exec a script - implemented just first command, script store at file, i read end exec a sql script by this code:
    @QString script;
    QFileInfo fi(QDir(DATA_FOLDER), DATABASE_INSTALL_SCRIPT);
    QString path = fi.absoluteFilePath();
    QFile file(path);
    if(file.exists()){
    file.open(QIODevice::Text | QIODevice::ReadOnly);
    QTextStream stream(&file);
    script = stream.readAll();
    m_db.exec(script);// when i set breakpoint hear, variable script is not empty, and have a needed script
    }@
    script file contains a text:
    @CREATE TABLE IF NOT EXISTS [tab1] (
    [S_ID] integer NOT NULL,
    [E_ID] int NOT NULL,
    [ALLSET] BOOLEAN NOT NULL,
    [DATETIME] datetime NOT NULL,
    [SOURCE] text NOT NULL,
    CONSTRAINT [PK_tab1] PRIMARY KEY ([S_ID], [E_ID], [ALLSET], [DATETIME])
    );

    CREATE TABLE IF NOT EXISTS [tab2] (
    [S_ID] smallint NOT NULL UNIQUE,
    [NAME] char(50) NOT NULL,
    );

    REPLACE INTO [tab2] (S_ID, NAME) VALUES (1, "Number 1");
    REPLACE INTO [tab2] (S_ID, NAME) VALUES (2, "Number 2");
    REPLACE INTO [tab2] (S_ID, NAME) VALUES (3, "Number 3");@

    Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz).

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    • Z Offline
      Z Offline
      ZapB
      wrote on 5 Jul 2011, 07:42 last edited by
      #2

      The QSqlDataBase::exec() function is just a convenience function to save you having to create a QSqlQuery object yourself. Reading the docs you'll see that it executes a single SQL statement not an entire sql script.

      You are responsible for passing the script statements to the QSqlDataBase yourself either using exec() or by creating QSqlQuery objects. Don't forget to check that each was successful before moving onto the next.

      Nokia Certified Qt Specialist
      Interested in hearing about Qt related work

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      • M Offline
        M Offline
        maxim.prishchepa
        wrote on 5 Jul 2011, 08:36 last edited by
        #3

        Tnx, i solve this problem that:
        @QSqlQuery query(m_db);
        QStringList queryes = script.split(QChar(';'));
        foreach(QString queryString, queryes){
        query.exec(queryString);
        }
        @

        Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz).

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        • Z Offline
          Z Offline
          ZapB
          wrote on 5 Jul 2011, 08:38 last edited by
          #4

          Don't forget to check for any errors after issuing each query.

          Nokia Certified Qt Specialist
          Interested in hearing about Qt related work

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          • G Offline
            G Offline
            goetz
            wrote on 5 Jul 2011, 09:49 last edited by
            #5

            [quote author="Maxim Prishchepa" date="1309855003"]Tnx, i solve this problem that:
            @QSqlQuery query(m_db);
            QStringList queryes = script.split(QChar(';'));
            foreach(QString queryString, queryes){
            query.exec(queryString);
            }
            @[/quote]

            This only works if you never have a semicolon (';') in your data.

            http://www.catb.org/~esr/faqs/smart-questions.html

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            • A Offline
              A Offline
              andre
              wrote on 5 Jul 2011, 10:01 last edited by
              #6

              Indeed. For safety, you need to do some more intelligent parsing for your split than just splitting on a semicolon.

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              • M Offline
                M Offline
                maxim.prishchepa
                wrote on 5 Jul 2011, 10:32 last edited by
                #7

                Tnx a lot!
                I'm rewrite code to this:
                @QString queryToExec;
                foreach(QString queryString, queryes){
                queryToExec += queryString;
                if(queryString.endsWith(QChar(')')) == false){
                queryToExec += ";";
                continue;
                }
                query.exec(queryToExec);
                queryToExec = QString();
                }@
                I think in current data field never happen a string like ");"

                Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz).

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                • G Offline
                  G Offline
                  goetz
                  wrote on 5 Jul 2011, 10:36 last edited by
                  #8

                  @
                  CREATE sequence foo;
                  CREATE sequence bar;
                  @

                  bang

                  http://www.catb.org/~esr/faqs/smart-questions.html

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                  • M Offline
                    M Offline
                    maxim.prishchepa
                    wrote on 5 Jul 2011, 10:40 last edited by
                    #9

                    Ah... :)
                    Why Qt dose not contains a SQL parser? :))

                    Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz).

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                    • G Offline
                      G Offline
                      goetz
                      wrote on 5 Jul 2011, 10:43 last edited by
                      #10

                      [quote author="Maxim Prishchepa" date="1309862429"]Ah... :)
                      Why Qt dose not contains a SQL parser? :))[/quote]

                      Why should it? It's hard to implement and used only for corner cases... (yes I saw the smiley :-) )

                      http://www.catb.org/~esr/faqs/smart-questions.html

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                      • A Offline
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                        andre
                        wrote on 5 Jul 2011, 12:31 last edited by
                        #11

                        Note that for those corner cases, it may be acceptable to access the API of the underlying driver directly. There may be support for sending multiple statements in one go at that level. Otherwise, perhaps you can look into using Predicate. I believe that that SQL framework does include an SQL parser.

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