[DB-SIG] Parameter substitution and "IN" operator

[Eric Brunson]

Has there been any discussion of supporting lists or tuples as 
parameters to the "IN" operator?

I'd like to be able to do something to the effect of:

curs.execute( "select * from mytable where col1 = %s and col2 in (%s)",
              ( 'firstval', ('list', 'of', 'vals') )


Or perhaps:

curs.execute( "select * from mytable where col1 = %s and col2 in %s",
              ( 'firstval', ('list', 'of', 'vals') )


And have the module include the parens.

It seems to almost work sometimes:

c.execute( 'select * from gateway where code in %s', ( ( 1, 2 ), ) )
print c._executed

Yields:

select * from gateway where code in ('1', '2')


but

c.execute( 'select * from gateway where code in %s', ( ( 'cys', 'syr' ), ) )
print c._executed

yields:

select * from gateway where code in ("'cys'", "'syr'")


Besides, I think it's just a side effect of the string representations 
of the tuple and not a planned feature.

I know how to build a string with the correct number of placeholders for 
my "IN" list, but I think it would be a nice feature of the API to 
handle it for the the user.

Thanks,
e.