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Obtaining primary key information from pg system tables
3+ messages / 2 participants
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* Obtaining primary key information from pg system tables
@ 2002-06-22 10:30  Kris <krisallsop@btinternet.com>
  0 siblings, 1 reply; 3+ messages in thread

From: Kris @ 2002-06-22 10:30 UTC (permalink / raw)
  To: pgsql-sql

Hi,

I am trying to generate some xml metadata from the pg system tables for my java code generation utility. I have can get most information, but i would like to be able to tell which column is a primary key or which one is a foreign key (i dont need to know which table the foreign key references at this point).

Which tables do i need reference, could anyone provide an example query?

Kris

^ permalink  raw  reply  [nested|flat] 3+ messages in thread

* Re: Obtaining primary key information from pg system tables
@ 2002-06-22 10:44  Dmitri Colebatch <dim@bigpond.net.au>
  parent: Kris <krisallsop@btinternet.com>
  0 siblings, 1 reply; 3+ messages in thread

From: Dmitri Colebatch @ 2002-06-22 10:44 UTC (permalink / raw)
  To: Kris <krisallsop@btinternet.com>; pgsql-sql

Kris,

I'm assuming you dont want to do this, but just in case you're not aware of the option - the JDBC API exposes this information.  

hth
dim
  ----- Original Message ----- 
  From: Kris 
  To: pgsql-sql@postgresql.org 
  Sent: Saturday, June 22, 2002 8:30 PM
  Subject: [SQL] Obtaining primary key information from pg system tables


  Hi,

  I am trying to generate some xml metadata from the pg system tables for my java code generation utility. I have can get most information, but i would like to be able to tell which column is a primary key or which one is a foreign key (i dont need to know which table the foreign key references at this point).

  Which tables do i need reference, could anyone provide an example query?

  Kris

^ permalink  raw  reply  [nested|flat] 3+ messages in thread

* Re: Obtaining primary key information from pg system tables
@ 2002-06-22 11:08  Kris <krisallsop@btinternet.com>
  parent: Dmitri Colebatch <dim@bigpond.net.au>
  0 siblings, 0 replies; 3+ messages in thread

From: Kris @ 2002-06-22 11:08 UTC (permalink / raw)
  To: Dmitri Colebatch <dim@bigpond.net.au>; pgsql-sql

Thanx for replying Dmitri,

I am aware of the JDBC API exposing information, it might be an idea to use both the system tables and JDBC information in the this case. The reason why i want to use the system tables is for example , (in MS SQL Server and Oracle) the NVARCHAR and NVARCHAR2 datatypes are not part of the JDBC spec and when using JDBC there is no way of telling these part from a VARCHAR or VARCHAR2. I needed to do this with when writing a java based insert script generator so i could cast the strings with the N. I was thinking the system tables were more reliable but i dont need to use just those i guess.

Kris

----- Original Message ----- 
  From: Dmitri Colebatch 
  To: Kris ; pgsql-sql@postgresql.org 
  Sent: Saturday, June 22, 2002 11:44 AM
  Subject: Re: [SQL] Obtaining primary key information from pg system tables


  Kris,

  I'm assuming you dont want to do this, but just in case you're not aware of the option - the JDBC API exposes this information.  

  hth
  dim
    ----- Original Message ----- 
    From: Kris 
    To: pgsql-sql@postgresql.org 
    Sent: Saturday, June 22, 2002 8:30 PM
    Subject: [SQL] Obtaining primary key information from pg system tables


    Hi,

    I am trying to generate some xml metadata from the pg system tables for my java code generation utility. I have can get most information, but i would like to be able to tell which column is a primary key or which one is a foreign key (i dont need to know which table the foreign key references at this point).

    Which tables do i need reference, could anyone provide an example query?

    Kris

^ permalink  raw  reply  [nested|flat] 3+ messages in thread

end of thread, other threads:[~2002-06-22 11:08 UTC | newest]

Thread overview: 3+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2002-06-22 10:30 Obtaining primary key information from pg system tables Kris <krisallsop@btinternet.com>
2002-06-22 10:44 ` Dmitri Colebatch <dim@bigpond.net.au>
2002-06-22 11:08   ` Kris <krisallsop@btinternet.com>

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