int4 <--> varch2 conversions

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I'm working with a PHP-based application that is using PostgreSQL in
the background.  One of the tables in the application has been used
for double-duty which is causing a problem.  Unfortunately, I can't
readily change the way the table is being used....

One of the columns is defined as being varchar.  But sometimes it
needs to hold an int4 value.  So, I need to be able to convert from
int4 to varchar and back.  The actual query is:

select members.id, members.element, slips.sid, slips.problem
  from slips, members
 where members.element = slips.sid::varchar
   and members.id = 'quickslips'

which give an error in the ::varchar cast.  It also gives an error
without the cast.

I couldn't find any functions in the online manuals that will allow me
to convert back and forth.  Are there any?

This is with PostgreSQL 6.3.2.

roland

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Roland B. Roberts, PhD                  Custom Software Solutions
roberts@panix.com                           101 West 15th St #4NN
                                               New York, NY 10011