Обсуждение: libpq: possible to get list of tables, fields, and types?
using libpq, is it possible to get a list of tables (psql: \d equivalent), list of fields for each of those tables (psql: \d <table>), and types for each of the fields for a given container? there doesnt seem to be a way to do any of these, except for getting the field type of a returned tuple with PQftype() and looking up the returned oid in the pg_attribute. it does appear to be possible to query system tables (psql: \dS) for some of this data, such as pg_tables for a list of tables. yet there doesnt appear to be a way to associate these entries to a particular datbase container. am i missing some way to glue these tables together to get a list of tables per-container and fields per-table? tia, -heas
john heasley wrote: >using libpq, is it possible to get a list of tables (psql: \d equivalent), >list of fields for each of those tables (psql: \d <table>), and types for >each of the fields for a given container? > >there doesnt seem to be a way to do any of these, except for getting the >field type of a returned tuple with PQftype() and looking up the returned >oid in the pg_attribute. > >it does appear to be possible to query system tables (psql: \dS) for some >of this data, such as pg_tables for a list of tables. yet there doesnt >appear to be a way to associate these entries to a particular datbase >container. am i missing some way to glue these tables together to get a >list of tables per-container and fields per-table? > >tia, >-heas > >---------------------------(end of broadcast)--------------------------- >TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org > Hi, yes - system tables is the right answer. pg_tables is a view on pg_class. And pg_class has the information you need. Look into the developers guide for a description of systemtables. Information about the attributes are in pg_attribute. Just join it with pg_class: select relname, attname, atttypid, attlen from pg_attribute join pg_class on attrelid = pg_class.oid A good source for information is pgaccess. It is a TCL-script. You can find examples in the source. Tommi
> select relname, attname, atttypid, attlen from pg_attribute join > pg_class on attrelid = pg_class.oid This gives all the attributes of a given table, but I couldn't find any join giving all the tables of a particular database ( no dboid in pg_class ). Did someone here found this kind of join ? -- cordialement, William WAISSE fpr = 9CCD 7DA2 7050 8805 F471 03D1 DF76 B78C 690B 4E07 -- Computers are like air conditionners. They work better when you close windows. -- Visitez donc mon site perso (version 0.4 du 29/05/2001) : http://www.neofutur.net -- Vous habitez dans l'Essonne et vous aimez les Pingouins ??? visitez donc la GAULE(=LUG91) : http://www.gaule.org -----BEGIN GEEK CODE BLOCK----- Version: 3.12 GCS/E/MU d- s: a- C++++ UL+++ P+ L++++ E--- W++ N o-- K- w--- O- M- V- PS+ PE-- Y++ PGP++ t+ 5 X++ R++ tv- b+++ DI- D G e++ h* r++ y+++ ------END GEEK CODE BLOCK------