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Re: [INTERFACES] A few more JDBC meta-data questions...

From: "D'Arcy" "J(dot)M(dot)" Cain <darcy(at)druid(dot)net>
To: mdz(at)phalanx(dot)phalanx(dot)net (Mark Dzmura)
Cc: pgsql-interfaces(at)postgreSQL(dot)org
Subject: Re: [INTERFACES] A few more JDBC meta-data questions...
Date: 1999-08-17 11:19:00
Message-ID: m11GhGe-0000dbC@druid.net (view raw or flat)
Thread:
Lists: pgsql-interfaces
Thus spake Mark Dzmura
> 1. Is it possible to programatically enumerate or discover the databases in a running database??
> 
> 2. Is it possible to programmaticaly enumerate or discover the tables in a database??

-- get list of databases                             
SELECT datname FROM pg_database;                     
    
-- get list of tables including views but not system tables
SELECT relname FROM pg_class
    WHERE relkind = 'r' AND                          
        relname !~ '^Inv' AND     
        relname !~ '^pg_';
    
And for completeness;                                
    
-- get list of attributes and types for a specific table
SELECT pg_attribute.attname, pg_type.typname
    FROM pg_class, pg_attribute, pg_type
    WHERE pg_class.relname = 'tablename' AND         
        pg_attribute.attnum > 0 AND
        pg_attribute.attrelid = pg_class.oid AND     
        pg_attribute.atttypid = pg_type.oid; 
    
-- get list of tables and primary keys (assumes no complex keys)
-- only includes tables with primary keys so no views
SELECT pg_class.relname, pg_attribute.attname        
    FROM pg_class, pg_attribute, pg_index    
    WHERE pg_class.oid = pg_attribute.attrelid AND
        pg_class.oid = pg_index.indrelid AND
        pg_index.indkey[0] = pg_attribute.attnum AND
        pg_index.indisprimary = 't';

-- 
D'Arcy J.M. Cain <darcy(at){druid|vex}.net>   |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 424 2871     (DoD#0082)    (eNTP)   |  what's for dinner.

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