Обсуждение: getting type name
Hi, How do i get a char * type from a type Oid. i.e. getStringTypeFromOid(INT4OID) will return "int4". 10x. -- Regards, Tzahi. -- Tzahi Fadida Blog: http://tzahi.blogsite.org | Home Site: http://tzahi.webhop.info WARNING TO SPAMMERS: see at http://members.lycos.co.uk/my2nis/spamwarning.html
On Sun, Jul 09, 2006 at 09:03:21PM +0300, Tzahi Fadida wrote: > How do i get a char * type from a type Oid. i.e. getStringTypeFromOid(INT4OID) > will return "int4". Server-side or client-side? In the backend I think you could use format_type_be() or format_type_with_typemod(), both declared in utils/builtins.h and defined in src/backend/utils/adt/format_type.c. -- Michael Fuhr
On Sunday 09 July 2006 21:49, Michael Fuhr wrote: > On Sun, Jul 09, 2006 at 09:03:21PM +0300, Tzahi Fadida wrote: > > How do i get a char * type from a type Oid. i.e. > > getStringTypeFromOid(INT4OID) will return "int4". > > Server-side or client-side? In the backend I think you could use Backend. > format_type_be() or format_type_with_typemod(), both declared in > utils/builtins.h and defined in src/backend/utils/adt/format_type.c. They return format_type_be(INT4OID) = "integer" or format_type_be(FLOAT8OID) = "double precision" I need to use this in a query with the "::" cast operator. There is a function SPI_gettype but it works on relations. I wish to work directly with the oid types without opening a relation. 10x. -- Regards, Tzahi. -- Tzahi Fadida Blog: http://tzahi.blogsite.org | Home Site: http://tzahi.webhop.info WARNING TO SPAMMERS: see at http://members.lycos.co.uk/my2nis/spamwarning.html
On Sun, Jul 09, 2006 at 10:08:42PM +0300, Tzahi Fadida wrote: > They return format_type_be(INT4OID) = "integer" or format_type_be(FLOAT8OID) > = "double precision" > I need to use this in a query with the "::" cast operator. The problem being? test=# select '1'::integer, '4.5'::double precision;int4 | float8 ------+-------- 1 | 4.5 (1 row) Have a nice day, -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > From each according to his ability. To each according to his ability to litigate.
On Monday 10 July 2006 00:29, Martijn van Oosterhout wrote: > On Sun, Jul 09, 2006 at 10:08:42PM +0300, Tzahi Fadida wrote: > > They return format_type_be(INT4OID) = "integer" or > > format_type_be(FLOAT8OID) = "double precision" > > I need to use this in a query with the "::" cast operator. > > The problem being? Just if it is a one-to-one conversion, otherwise the same type equality functions i use would potentially not work properly. > > test=# select '1'::integer, '4.5'::double precision; > int4 | float8 > ------+-------- > 1 | 4.5 > (1 row) > > Have a nice day, -- Regards, ��������Tzahi. -- Tzahi Fadida Blog: http://tzahi.blogsite.org | Home Site: http://tzahi.webhop.info WARNING TO SPAMMERS: �see at http://members.lycos.co.uk/my2nis/spamwarning.html
On Mon, Jul 10, 2006 at 02:03:11AM +0300, Tzahi Fadida wrote: > On Monday 10 July 2006 00:29, Martijn van Oosterhout wrote: > > On Sun, Jul 09, 2006 at 10:08:42PM +0300, Tzahi Fadida wrote: > > > They return format_type_be(INT4OID) = "integer" or > > > format_type_be(FLOAT8OID) = "double precision" > > > I need to use this in a query with the "::" cast operator. > > > > The problem being? > > Just if it is a one-to-one conversion, otherwise the same type > equality functions i use would potentially not work properly. Well, it is a one-to-one conversion. A float8 == double precision. They are mapped together very early. Similarly for integer == int4. If you look in the pg_type table, you'll see there are no entries for "integer" or "double precision". The fancy output is mostly for compatability purposes (SQL defines these names). Have a nice day, -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > From each according to his ability. To each according to his ability to litigate.