Re: Insert Function

On Wednesday 10 July 2002 23:04, David Durst wrote:
> I am not sure what the end select does, so if you can give me a explination
> it would be apreciated

It is there to satisfy the requirement that the function should return
a value from a select statement:

"12.2. Query Language (SQL) Functions

SQL functions execute an arbitrary list of SQL statements, returning the
result of the last query in the list, which must be a SELECT. ..."

(see http://www.postgresql.org/idocs/index.php?xfunc-sql.html )

After an INSERT statement you need to provide an arbitrary
select statement, which could return anything. All the example
does is return a string telling you what you've just done.

Ian Barwick

> > On Wednesday 10 July 2002 21:59, David Durst wrote:
> >> Is there anyway to create a insert function?
> >> I am trying:
> >> CREATE FUNCTION
> >> add_user(varchar(20),varchar(20),varchar(20),int4,int4) RETURNS int4
> >> AS 'INSERT INTO usr
> >> (user_name,first_name,last_name,permission_set_id,customer_id) values
> >> ($1,$2,$3,$4,$5)' language 'sql';
> >>
> >> and get:
> >>
> >> ERROR: function declared to return integer, but final statement is
> >> not a SELECT
> >> I thought that a insert would return a internal row #, but I am not
> >> sure about this.
> >
> > You can do something like this:
> >
> > CREATE FUNCTION add_user(varchar(20),varchar(20),varchar(20),int4,int4)
> > RETURNS VARCHAR AS
> > 'INSERT INTO usr
> > (user_name,first_name,last_name,permission_set_id,customer_id)
> > VALUES
> > ($1,$2,$3,$4,$5);
> > SELECT ''created user ''|| $1::VARCHAR'
> > language 'sql';
> >
> > HTH
> >
> > Ian Barwick
> >
> >
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