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QSqlQuery::bindValue() : Is possible to bound values to multiple locations?

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #5

    Hi,

    What SQL backend are you using ?
    Some have changed over time to implement that feature. IIRC, the SQLite driver recently was updated because the SQLite version used had that feature implemented.

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    • SGaistS SGaist

      Hi,

      What SQL backend are you using ?
      Some have changed over time to implement that feature. IIRC, the SQLite driver recently was updated because the SQLite version used had that feature implemented.

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      P Offline
      PetrS82
      wrote on last edited by
      #6

      Oracle 12.1.0

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      • Christian EhrlicherC Christian Ehrlicher

        @PetrS82 said in QSqlQuery::bindValue() : Is possible to bound values to multiple locations?:

        But some exaples deos not work.

        Which example does not work? 'Some' is a little bit imprecise.

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        PetrS82
        wrote on last edited by PetrS82
        #7

        Hello,
        I made following table (using Oracle SQL Developer):
        create table testtable (KEY VARCHAR(255), VALUE VARCHAR(255), ID VARCHAR(255));

        In C++ I have folloving code:

        QSqlQuery query(db);
        
        query.prepare("declare "
                    "x NUMBER; "
                    "begin "
                    "insert into testtable(KEY, VALUE, ID) "
                    "values ('INIT_TEST', :INIT_ID, :INIT_ID); "
                    "insert INTO testtable(ID, KEY, VALUE) "
                    "select :RESULT_ID, 'TEST_INIT_ID', VALUE "
                    "from testtable "
                    "where ID = :INIT_ID; "
                    "end; ");
        
        
        query.bindValue(":INIT_ID", 1000);
        query.bindValue(":RESULT_ID", 2000);
        
        
        if (query.exec()) {
            cout << "query.exec: OK" << endl;
        } else {
            cout << "query.exec: error " << query.lastError().text().toStdString() << endl;
        }
        

        The expected result is:

         ID     |       KEY         |  VALUE
        1000    |   INIT_TEST       |  1000
        2000    |  TEST_INIT_ID     |  1000
        

        But the real result is:

         ID     |        KEY       |  VALUE
        1000    |   INIT_TEST      |  1000
        1000    |  TEST_INIT_ID    |  1000
        

        Both IDs are 1000 (and console output is "query.exec: OK").
        Note that if I run this statement in SQL Developer, the result is as expected.

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        • Christian EhrlicherC Online
          Christian EhrlicherC Online
          Christian Ehrlicher
          Lifetime Qt Champion
          wrote on last edited by
          #8

          As @SGaist and I already said - don't use it. It may work (with the Qt Sqlite driver) but obviously not with the Qt ODBC driver (which you seem to use, but did not yet told us).

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          • Christian EhrlicherC Christian Ehrlicher

            As @SGaist and I already said - don't use it. It may work (with the Qt Sqlite driver) but obviously not with the Qt ODBC driver (which you seem to use, but did not yet told us).

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            PetrS82
            wrote on last edited by
            #9
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            • Christian EhrlicherC Christian Ehrlicher

              As @SGaist and I already said - don't use it. It may work (with the Qt Sqlite driver) but obviously not with the Qt ODBC driver (which you seem to use, but did not yet told us).

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              PetrS82
              wrote on last edited by
              #10

              @Christian-Ehrlicher QOCI

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              • Christian EhrlicherC Christian Ehrlicher

                As @SGaist and I already said - don't use it. It may work (with the Qt Sqlite driver) but obviously not with the Qt ODBC driver (which you seem to use, but did not yet told us).

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                PetrS82
                wrote on last edited by
                #11

                @Christian-Ehrlicher
                Is QOCI what you asked me? I don't know more. Here is one line (edited) form config.xml file we use for connection

                connection user="user_foo" password="password_foo" host="localhost" port="port_number" typ="QOCI" name="DATABASE_FOO" sid="ORCL" db_name="ORCL"

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                • Christian EhrlicherC Online
                  Christian EhrlicherC Online
                  Christian Ehrlicher
                  Lifetime Qt Champion
                  wrote on last edited by
                  #12

                  QOCI is even older - it has not been touched since Qt4 times so if it did not work with Qt4 it will not with Qt5.

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #13

                    IIRC, you can check if the driver provided that feature.

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                    • Christian EhrlicherC Christian Ehrlicher

                      QOCI is even older - it has not been touched since Qt4 times so if it did not work with Qt4 it will not with Qt5.

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                      PetrS82
                      wrote on last edited by
                      #14

                      @Christian-Ehrlicher

                      cout << "NamedPlaceholders: " << db.driver()->hasFeature(QSqlDriver::NamedPlaceholders) << endl;
                      cout << "PositionalPlaceholders: " << db.driver()->hasFeature(QSqlDriver::PositionalPlaceholders) << endl;

                      OUTPUT:
                      NamedPlaceholders: 1
                      PositionalPlaceholders: 0

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #15

                        @PetrS82 said in QSqlQuery::bindValue() : Is possible to bound values to multiple locations?:

                        query.prepare("declare "
                        "x NUMBER; "
                        "begin "
                        "insert into testtable(KEY, VALUE, ID) "
                        "values ('INIT_TEST', :INIT_ID, :INIT_ID); "
                        "insert INTO testtable(ID, KEY, VALUE) "
                        "select :RESULT_ID, 'TEST_INIT_ID', VALUE "
                        "from testtable "
                        "where ID = :INIT_ID; "
                        "end; ");

                        Isn't that set of queries invalid ?
                        Your second insert is missing the values part and your select clause explicitly asks to show the value of :RESULT_ID first and then the content of the other two columns. Which makes the output you show even more surprising.

                        Interested in AI ? www.idiap.ch
                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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