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List: postgresql-admin
Subject: [ADMIN] Using psql variables in scripts
From: Corey Horton <Corey_Horton () messageone ! com>
Date: 2008-05-30 17:39:14
Message-ID: C12DE7393B7AFA45BFD2A8BDC4BD440104CA8337 () auscorpex-1 ! austin ! messageone ! com
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Would like to use variables in combination with files for common psql
queries, and am using PG 8.1.4.
For example
\set table_name pg_class
select * from pg_tables where tablename = ':table_name';
This returns no rows, even though the customer table exists. It appears
to be search for a table called ":table_name".
I can get this to work by doing the following:
\set table_name '\'pg_class\''
select * from pg_tables where tablename = :table_name;
schemaname | tablename | tableowner | tablespace | hasindexes |
hasrules | hastriggers
------------+-----------+------------+------------+------------+--------
--+-------------
pg_catalog | pg_class | postgres | | t | f
| f
Is there any way to do use variables within quotes?
Thanks,
Corey Horton
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Would like to use variables in combination with files for
common psql queries, and am using PG 8.1.4.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>For example<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>\set table_name pg_class<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>select * from pg_tables where tablename = \
‘:table_name’;<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This returns no rows, even though the customer table
exists. It appears to be search for a table called \
”:table_name”.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I can get this to work by doing the \
following:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>\set table_name '\'pg_class\''<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>select * from pg_tables where tablename = \
:table_name;<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> schemaname | tablename | tableowner | tablespace |
hasindexes | hasrules | hastriggers<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>------------+-----------+------------+------------+------------+----------+-------------<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> pg_catalog | pg_class | postgres \
| | \
t | \
f | f<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Is there any way to do use variables within \
quotes?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks,<br>
Corey Horton<o:p></o:p></span></font></p>
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