Does this work instead:
table.update().values(empno = cast(table.c.empno,Integer)).execute()
ie. a bare 'empno' inside your cast expression is just referring to a python
variable 'empno', which you've probably set to the value 'testing' at some
other point in your code. You need the column object table.c.empno instead
Hope that helps,
Simon
pravin battula wrote
>
> Mike,
>
> when i execute the below sql statement directly in the database using
> sqlyog,it works fine but when tried with sqlalchemy it didn't.
> update mytable set EmpMaster = cast(empno as UNSIGNED INTEGER)
>
> On Sep 14, 8:23 pm, pravin battula <pravin.batt...@gmail.com> wrote:
> > Hi Mike,
> >
> > I'm using Mysql 5.0 backend
> >
> > On Sep 14, 8:20 pm, Mike Conley <mconl...@gmail.com> wrote:
> >
> >
> >
> >
> >
> >
> >
> > > Don't know what database you are using, but this looks like you
> are trying
> > > to cast the string 'testing' to an integer and the database
> engine says you
> > > can't do that.
> >
> > > --
> > > Mike Conley
> >
> > > On Wed, Sep 14, 2011 at 9:51 AM, pravin battula
> <pravin.batt...@gmail.com>wrote:
> >
> > > > Sorry for the spelling mistake.It shows an error as below.
> > > > OperationalError: (OperationalError) (1292, "Truncated
> incorrect
> > > > INTEGER value: 'testing'") 'UPDATE test.mytable SET
> > > > `newColumn`=CAST(test.mytable.`empno` AS SIGNED INTEGER)' ()
> >
> > > > On Sep 14, 6:48 pm, pravin battula <pravin.batt...@gmail.com>
> wrote:
> > > > > Hi,
> >
> > > > > I'm using cast to update values in a table by issuing
> following
> > > > > command.
> >
> > > > > table.update().values(empno = cast(empno,Integer)).execute().
> >
> > > > > Where as empno is an string field,i'm trying to convert the
> data from
> > > > > empno column from string to integer and then issuing the
> below command
> > > > > to alter the data type of the column by issuing following
> command.
> > > > > alter_column(table.c.empno,type=Integer).
> >
> > > > > It shows an error as
> > > > > OperationalError: (OperationalError) (1292, "Truncated
> incorrect
> > > > > INTEGER value: '1d'") 'UPDATE test.mytable SET
> > > > > `newColumn`=CAST(CAST(%s AS CHAR) AS SIGNED INTEGER)' ('1d',)
> >
> > > > > Please do the needful
> >
> > > > --
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