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Thread: ODBC driver error QODBCResult::data: column out of range

  1. #1
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    Default ODBC driver error QODBCResult::data: column out of range

    Greetings, I'm sending this query to a third party program database using an ODBC driver

    Qt Code:
    1. "SELECT table FROM Column WHERE DESCRIPCION = 'SOMETHING'"
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    my funtion should return a Stringlist with the values of column "o" where the value of column "k" match "pointer"

    Let's say, for example that my table is like
    Qt Code:
    1. code name lastname description
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    if i set o="0" it return the codes fine, but any value diferent that "0" return the error "QODBCResult::data: column # out of range".

    This is the same funtion that I use for a Postgres database but for some reason it doesn't work with the ODBC driver

    Qt Code:
    1. QStringList conecta2::leedb(QString table, int k, int o, QString pointer)
    2. {
    3. conectdbisam();
    4. QString line;
    5. QString line2;
    6. QStringList lista;
    7. int h;
    8. h=0;
    9. if(db.open())
    10. {
    11. QSqlQuery qry;
    12. if(qry.exec("SELECT * FROM "+table))
    13. {
    14. QSqlRecord rec = qry.record();
    15. columna = rec.fieldName(k);
    16. }
    17. if(qry.exec("SELECT "+columna+" FROM "+table+" WHERE "+columna+" = '"+pointer+"'"))
    18. {
    19. while(qry.next())
    20. {
    21. line2 =qry.value(o).toString().simplified();
    22. lista.append(line2);
    23. h++;
    24. if (h==500)
    25. break;
    26. }
    27. }
    28. else
    29. {
    30. qDebug() << "Error =" << db.lastError().text();
    31. }
    32. qry.clear();
    33. }
    34. else
    35. {
    36. qDebug() << "Error =" << db.lastError().text();
    37. }
    38. return QStringList(lista);
    39. }
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    Does anyone see the problem with this code, or maybe a work around?

    Thank in advance.

  2. #2
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    Default Re: ODBC driver error QODBCResult::data: column out of range

    In line 17 query result always have only one column. So that a value other than 0 for a variable o does not make sense.

  3. #3
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    Default Re: ODBC driver error QODBCResult::data: column out of range

    you are so right, just fix the problem by changing the sql comand to
    Qt Code:
    1. if(qry.exec("SELECT * FROM "+table+" WHERE "+columna+" = '"+pointer+"'"))
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    it works now, thank you!

  4. #4
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    Default Re: ODBC driver error QODBCResult::data: column out of range

    But this solution is worse. Why download anything from the database if you need only one column?

  5. #5
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    Default Re: ODBC driver error QODBCResult::data: column out of range

    I just need the column that match a certain criteria, for example, Let's say my db is like this:

    Code name lastname description
    001 Andrew Gaven Ingenier
    002 Bill Doe CEO
    003 Jonh OConnor CEO
    .
    .

    I might just need the names of the CEO so my values should be pointer="CEO", k=3 (witch is my description column) and o=1 (the names column), ¿do you have a better idea?

  6. #6
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    Default Re: ODBC driver error QODBCResult::data: column out of range

    This really is quite an odd mechanism you are implementing. Typically you would know the names of the columns of interest without having to look them up using column indexes.

    Look up the column name of both columns and use those in your query.
    Qt Code:
    1. if(qry.exec( QString("SELECT * FROM %1 WHERE 1 = 0").arg(table) )) // condition stops row return but should allow column info
    2. {
    3. QSqlRecord rec = qry.record();
    4. columnk = rec.fieldName(k);
    5. columno = rec.fieldName(o);
    6. }
    7. if(qry.exec( QString("SELECT %1 FROM %2 WHERE %3 = '%4' ").arg(columno).arg(table).arg(columnk).arg(pointer) ))
    8. {
    9. while(qry.next())
    10. {
    11. line2 =qry.value(0).toString().simplified(); // That is a zero
    12. lista.append(line2);
    13. h++;
    14. if (h==500)
    15. break;
    16. }
    17. }
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    All assumes that o and k indexes are in range and that the table name and "pointer" value have been sanitised to avoid SQL injection issues.
    Last edited by ChrisW67; 16th January 2013 at 04:20.

  7. #7
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    Default Re: ODBC driver error QODBCResult::data: column out of range

    BTW the SQL standard guarantees a constant order of the columns in the query "SELECT * ...." ?

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