EXECUTE IMMEDIATE help

[finlma]

I'm trying to run an EXECUTE IMMEDIATE within a PL/SQL if loop but it
doesn't work for me. I'm trying to create a column conditionally but
it doesn't work. It fails because there are apostrophes within the
statement. How do I override the apostrophe?

DECLARE cCount NUMBER;
BEGIN SELECT count(*)
INTO cCount
FROM all_tab_columns
WHERE owner = 'Owner'
AND table_name = 'table_name'
AND column_name = 'column_name' ;

IF cCount = 0 THEN
EXECUTE IMMEDIATE 'ALTER TABLE owner.table_nam e
ADD (column_name CHAR(1) DEFAULT ' ' NOT NULL)';
ELSE
EXECUTE IMMEDIATE 'ALTER TABLE owner.table_nam e
MODIFY column_name DEFAULT ' '';
END IF;
END;

Thanks

[Frank]

Re: EXECUTE IMMEDIATE help

finlma wrote:

I'm trying to run an EXECUTE IMMEDIATE within a PL/SQL if loop but it
doesn't work for me. I'm trying to create a column conditionally but
it doesn't work. It fails because there are apostrophes within the
statement. How do I override the apostrophe?
>
DECLARE cCount NUMBER;
BEGIN SELECT count(*)
INTO cCount
FROM all_tab_columns
WHERE owner = 'Owner'
AND table_name = 'table_name'
AND column_name = 'column_name' ;
>
IF cCount = 0 THEN
EXECUTE IMMEDIATE 'ALTER TABLE owner.table_nam e
ADD (column_name CHAR(1) DEFAULT ' ' NOT NULL)';
ELSE
EXECUTE IMMEDIATE 'ALTER TABLE owner.table_nam e
MODIFY column_name DEFAULT ' '';
END IF;
END;
>
Thanks

You don't override, you escape - with an extra quote:
to insert "It's XMAS time" in a table, you would:
insert into table(column) values ('It''s XMAS time');
And there's inefficient code: you do not need to know
*how* many (into cCount), you just want to know IF any:
select 1 into cCount from dual
where exists (...)
would be more efficient.
--
Regards, Frank van Bortel

[FaheemRao]

Re: EXECUTE IMMEDIATE help

you would like to include brackets in the statement as well like this


EXECUTE IMMEDIATE ('ALTER TABLE owner.table_nam e
ADD (column_name CHAR(1) DEFAULT '' '' NOT NULL)');


Thanks

Faheem


finlaymark@hotm ail.com (finlma) wrote in message news:<8b454add. 0312150935.7559 8e78@posting.go ogle.com>...

I'm trying to run an EXECUTE IMMEDIATE within a PL/SQL if loop but it
doesn't work for me. I'm trying to create a column conditionally but
it doesn't work. It fails because there are apostrophes within the
statement. How do I override the apostrophe?
>
DECLARE cCount NUMBER;
BEGIN SELECT count(*)
INTO cCount
FROM all_tab_columns
WHERE owner = 'Owner'
AND table_name = 'table_name'
AND column_name = 'column_name' ;
>
IF cCount = 0 THEN
EXECUTE IMMEDIATE 'ALTER TABLE owner.table_nam e
ADD (column_name CHAR(1) DEFAULT ' ' NOT NULL)';
ELSE
EXECUTE IMMEDIATE 'ALTER TABLE owner.table_nam e
MODIFY column_name DEFAULT ' '';
END IF;
END;
>
Thanks