Hi,
I have an ADO component in a delphi program that I use to check a database
for structure changes that are needed. This is basically just a long list o
f
SQL statements. In one instance I need to add a new field if it doesn't
exist, then update the field with values from another field. When I execute
the code, the program says it can't find the new field. If I take the updat
e
statement out it runs fine. Is there a way to either have the alter command
execute before the update command runs? If this were query analyzer I'd jus
t
use the 'GO' statement, is there an equivalent statement I could use? Here
is the SQL statements I'm using:
if not exists (SELECT *
FROM SYSCOLUMNS
WHERE ID = OBJECT_ID('MYTABLE')
AND Name = 'NEWFIELD'
)
begin
alter table mytable
add [NEWFIELD] nvarchar(7);
/* this statement below is what is failing */
update mytable set NEWFIELD=OLDFIELD where IsNull(OldField,'') <> '';
end;Two roundtrips, the first one to create the column and the second one to
update if everything was ok. Your application can also call OSQL utility to
execute a batch file.
AMB
"Thread77" wrote:
> Hi,
> I have an ADO component in a delphi program that I use to check a database
> for structure changes that are needed. This is basically just a long list
of
> SQL statements. In one instance I need to add a new field if it doesn't
> exist, then update the field with values from another field. When I execu
te
> the code, the program says it can't find the new field. If I take the upd
ate
> statement out it runs fine. Is there a way to either have the alter comma
nd
> execute before the update command runs? If this were query analyzer I'd j
ust
> use the 'GO' statement, is there an equivalent statement I could use? Her
e
> is the SQL statements I'm using:
> if not exists (SELECT *
> FROM SYSCOLUMNS
> WHERE ID = OBJECT_ID('MYTABLE')
> AND Name = 'NEWFIELD'
> )
> begin
> alter table mytable
> add [NEWFIELD] nvarchar(7);
> /* this statement below is what is failing */
> update mytable set NEWFIELD=OLDFIELD where IsNull(OldField,'') <> '';
> end;|||You can just do what ISQL is doing. Break up your batches (on the same
connection) on a GO (you will have to add it to your query) and send two
distinct commands to the server.
----
Louis Davidson - drsql@.hotmail.com
SQL Server MVP
Compass Technology Management - www.compass.net
Pro SQL Server 2000 Database Design -
http://www.apress.com/book/bookDisplay.html?bID=266
Blog - http://spaces.msn.com/members/drsql/
Note: Please reply to the newsgroups only unless you are interested in
consulting services. All other replies may be ignored :)
"Thread77" <Thread77@.discussions.microsoft.com> wrote in message
news:E2FA4078-BEDC-4D9F-BB35-75A9289E6EC0@.microsoft.com...
> Hi,
> I have an ADO component in a delphi program that I use to check a database
> for structure changes that are needed. This is basically just a long list
> of
> SQL statements. In one instance I need to add a new field if it doesn't
> exist, then update the field with values from another field. When I
> execute
> the code, the program says it can't find the new field. If I take the
> update
> statement out it runs fine. Is there a way to either have the alter
> command
> execute before the update command runs? If this were query analyzer I'd
> just
> use the 'GO' statement, is there an equivalent statement I could use?
> Here
> is the SQL statements I'm using:
> if not exists (SELECT *
> FROM SYSCOLUMNS
> WHERE ID = OBJECT_ID('MYTABLE')
> AND Name = 'NEWFIELD'
> )
> begin
> alter table mytable
> add [NEWFIELD] nvarchar(7);
> /* this statement below is what is failing */
> update mytable set NEWFIELD=OLDFIELD where IsNull(OldField,'') <> '';
> end;
ItayZ:
PK2000 wrote:
ing your installation program to copy with the