Re: VARCHAR to INTEGER conversion

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Re: VARCHAR to INTEGER conversion

От:
Stephan Szabo <sszabo@megazone23.bigpanda.com>
Дата:
On Wed, 16 Jan 2002, Darren Ferguson wrote:

> I have a stored procedure that takes in an integer
>
> sp_customer_service_property_descr(INTEGER)
>
> However i have a database field that is a VARCHAR because it can take
> either a number that would have to go into this stored procedure or it can
> just have normal text depending on the value of another field.
>
> I tried casting the VARCHAR as an INTEGER postgres (V7.2b4) doesn't let me
> do this. Now i understand why it is not letting me do this however here is
> my question
>
> Does anyone know of a work around so that i can call this function with
> the varchar database field.

If the rows you're working with won't have non-numeric values I think you
can do this by casting through text (varchar->text->integer). If the value
may not be a number that will still fail on those rows.

Re: VARCHAR to INTEGER conversion

От:
Jeff Eckermann <jeff_eckermann@yahoo.com>
Дата:
PostgreSQL allows for function overloading, i.e. you
can create another function with the same name (and
same logic) that takes a VARCHAR parameter. 
PostgreSQL will figure out which function you want,
based on the datatype of the parameter that you pass
to it.

IIRC, if you use pl/pgsql for your function, any type
casting required internally in the function (to get to
your return type) will be handled automagically.

--- Darren Ferguson  wrote:
> Hello list
> 
> I have a stored procedure that takes in an integer 
> 
> sp_customer_service_property_descr(INTEGER)
> 
> However i have a database field that is a VARCHAR
> because it can take
> either a number that would have to go into this
> stored procedure or it can
> just have normal text depending on the value of
> another field.
> 
> I tried casting the VARCHAR as an INTEGER postgres
> (V7.2b4) doesn't let me
> do this. Now i understand why it is not letting me
> do this however here is
> my question
> 
> Does anyone know of a work around so that i can call
> this function with
> the varchar database field.
> 
> Thanks in advance
> 
> Darren Ferguson
> 
> 
> 
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VARCHAR to INTEGER conversion

От:
Darren Ferguson <darren@crystalballinc.com>
Дата:
Hello list

I have a stored procedure that takes in an integer 

sp_customer_service_property_descr(INTEGER)

However i have a database field that is a VARCHAR because it can take
either a number that would have to go into this stored procedure or it can
just have normal text depending on the value of another field.

I tried casting the VARCHAR as an INTEGER postgres (V7.2b4) doesn't let me
do this. Now i understand why it is not letting me do this however here is
my question

Does anyone know of a work around so that i can call this function with
the varchar database field.

Thanks in advance

Darren Ferguson

Re: VARCHAR to INTEGER conversion

От:
Darren Ferguson <darren@crystalballinc.com>
Дата:
On Thu, 17 Jan 2002, Jeff Eckermann wrote:

> PostgreSQL allows for function overloading, i.e. you

Tried to avoid this since you do not want duplicate functions all over the
system. but i had considered a wrapper.

Steve's solution from last night worked in the conversion to text and then
integer so implemented that.

Thank you for the reply though it is very much appreciated 

Darren
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