[PyKDE] UPDATE to Qvariant problem (it looks like)

Hans-Peter Jansen hpj at urpla.net
Sat Jun 22 00:26:01 BST 2002

I made a mistake in the QSqlFieldInfo call. The error message is now:

QSqlField::setValue: monsalary cannot cast from QKeySequence to double

Problem persists. Corrected version attached.


On Fri, 21 Jun 2002 20:24:55 +0200
"Hans-Peter Jansen" <hpj at urpla.net> wrote:

> Hi Phil et al.,
> I hacked a bit on sqltable4.py to circumvent current PyQt Q_PROPERTY 
> problems. My solution is simply mapping the QComboBox index to the name.
> Working fine so far. I thought, a further improvement would be using
> a calculated field "Monthly Salary", so I tried to imitate the qt
> sql/overview/subclass4 example by subclassing QSqlCursor. In the
> overloaded calculateField method, it's necessary to return a QVariant:
>     def calculateField(self, name):
>         if str(name) == "monsalary":
>             v = self.value("salary").toDouble() / 12
>             return QVariant(v)
>         return QVariant(QString.null)
> Unfortunately, this produces strange error messages:
> QSqlField::setValue: monsalary cannot cast from QKeySequence to (null)
> Even the "return QVariant(QString.null)" statement gives:
> QSqlField::setValue: monsalary cannot cast from QString to (null)
> Any ideas, what happens here?
> This reminds me, that the docu states a lot QVariants variants as
> not yet implemented. Is this correct anymore?
> I've attached a reworked testdb.sql script to reflect the 
> necessary changes for the StatusPicker problem.
> G'day,
>   Hans-Peter
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