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How to write NULL to a Sql table
Posted:
Tue Apr 21, 2009 1:51 am
by Rick Lipkin
To All
How do I write NULL to a numeric or a nvarchar field on a Sql Server table .. when I do this :
oRsFac:Fields("permnum"):Value := if(i->permnum = 0, '', i->permnum )
"permnum" is a nvarchar(255) and i->permnum is numeric 10,0 .. The if() statement writes a zero to the SQL table and not the '' or NULL value ..
Same problem when I test for a char field and want to write NULL to the SQL table ..
Any Ideas ??
Thanks
Rick Lipkin
Re: How to write NULL to a Sql table
Posted:
Tue Apr 21, 2009 2:06 am
by Armando
Rick:
A silly question
Do you have defined the field to accept NULL?
Regards
Re: How to write NULL to a Sql table
Posted:
Tue Apr 21, 2009 2:32 am
by Armando
Rick:
With this sample I have no problem
- Code: Select all Expand view
LOCAL nValor := 10.50
// The field "UNI_USU" is VARCHAR(10) NOT NULL Type
oRsUni:Fields("UNI_USU"):Value := IIF(nValor = 0.00,'',nValor)
oRsUni:UpDate()
Neither with this an other example I have no problem neither
- Code: Select all Expand view
LOCAL nValor := 10.50
oRsUni:Fields("UNI_USU"):Value := IIF(nValor > 0.00,'',nValor)
oRsUni:UpDate()
Regards
Re: How to write NULL to a Sql table
Posted:
Tue Apr 21, 2009 3:05 am
by Rick Lipkin
To All
YES .. all the fields are marked to accept 'null' .. for some reason on SQL Server the in line if() does not seem to want to accept '' as null ( for me ) ..
I have in the mean time used a regular if statement and only append a field if it is NOT null .. leaving the field NULL where it needs to be .. a lot of extra code
Rick Lipkin
Re: How to write NULL to a Sql table
Posted:
Tue Apr 21, 2009 7:58 am
by Enrico Maria Giordano
Rick Lipkin wrote:oRsFac:Fields("permnum"):Value := if(i->permnum = 0, '', i->permnum )
Try
- Code: Select all Expand view
oRsFac:Fields("permnum"):Value := if(i->permnum = 0, , i->permnum )
EMG
Re: How to write NULL to a Sql table
Posted:
Tue Apr 21, 2009 8:30 am
by gkuhnert
Rick,
as SQL Statement you could write something like
- Code: Select all Expand view
UPDATE fac SET permnum = null WHERE permnum = 0
On the recordset it might then look like:
- Code: Select all Expand view
oRsFac:Fields("permnum"):Value := if(i->permnum = 0, nil, i->permnum )
or
oRsFac:Fields("permnum"):Value := if(i->permnum = 0, null, i->permnum )
but I don't know if it works on the recordset
Re: How to write NULL to a Sql table
Posted:
Tue Apr 21, 2009 2:43 pm
by Rick Lipkin
To All
oRsRel:Fields("qualified_ind"):Value := if(i->qualify = " ", , )
oRsRel:Fields("qualified_ind"):Value := if(i->qualify = " ", nil ,nil )
Both expressions should return NULL and what happends in MS Sql server the field is just appends blank spaces ..
Rick Lipkin
Re: How to write NULL to a Sql table
Posted:
Tue Apr 21, 2009 3:17 pm
by Enrico Maria Giordano
Works fine here using latest xHarbour from CVS.
EMG
Re: How to write NULL to a Sql table
Posted:
Tue Apr 21, 2009 3:30 pm
by Rick Lipkin
Enrico
Using FWH 811 and the xHarbour build 1.1.0 rev 6195 .. the database is MS Sql Server .. not any other sql flavor.
Rick Lipkin
Re: How to write NULL to a Sql table
Posted:
Tue Apr 21, 2009 7:58 pm
by Enrico Maria Giordano
Perhaps you should try with latest xHarbour from CVS.
EMG
Re: How to write NULL to a Sql table
Posted:
Wed Apr 22, 2009 2:56 am
by nageswaragunupudi
The solution I found long time back and working for me for assigning NULL to fields or parameter values.
- Code: Select all Expand view
#xtranslate NULL => VTWrapper( 1, nil )
...
...
// usage:
oRs:Fields(n):Value := NULL
oCmd:Parameters( n ):Value := NULL
I have not checked with the latest version of xHarbour, if assigning NIL has the same effect. If this works then its a lot better.
Re: How to write NULL to a Sql table
Posted:
Wed Apr 22, 2009 7:11 pm
by Rick Lipkin
Rao
YES ..
#xtranslate NULL => VTWrapper( 1, nil )
Was the answer !!
Thanks
Rick Lipkin
Re: How to write NULL to a Sql table
Posted:
Wed Apr 22, 2009 7:38 pm
by Enrico Maria Giordano
It seems you are using an old version of win32ole.prg.
EMG
Re: How to write NULL to a Sql table
Posted:
Wed Apr 22, 2009 8:18 pm
by Rick Lipkin
Enrico
Using the official binaries from FTDN for xHarbour 409 .. not linking in anything else .. and it appears the FTDN version has a newer build
revision than xHarbour.org
Rick
Re: How to write NULL to a Sql table
Posted:
Wed Apr 22, 2009 8:45 pm
by Enrico Maria Giordano
Sorry, I'm running out of ideas...
EMG