Here is a session transcript of creating a test database, running You can now use the postgres command line tool psql, and you canĬonnect to databases on this machine via Perl's DBD. Works although I suspect it has certain limitations. I've used the restart from user postgres, and it Restarting it from root always works and, as far as I know, Listen_addresses = '*' # what IP interface(s) to listen on Įxit the editor, and restart postgres.
Uncomment the line (remove the leading #), and change You will find the appropriate configuration field with a default valueĬommented out. The value to change isĭifferent in older versus newer versions of Postgres. If you have socket connections (Perl DBI uses socket connections),
#POSTGRESQL COMMANDS FULL#
This is a full example from one of my servers. If you will allow other hosts access to the database, you'll needĪdditional lines. In file pg_hba.conf uncomment the host line for 127.0.0.1: Next, su to postgres, edit 2 config files, and restart postgres. # Newer version seem to expect an explicit initdb command: Start the postgres daemon, then explicitly used the initdb option. If there are any warnings the first time you Not only controls postgres, but knows to initialize the db when it is Use the built in script in /etc/init which Need to su to postgres to manage databases, users, and Postgres Next set the postgres Unix account password.
#POSTGRESQL COMMANDS INSTALL#
Yum install postgresql-server.i386 postgresql.i386 perl-DBD-Pg.i386 Little more work, and I'll cover that topic later. A multi-host environment is possible with only a It takes 10 minutes or less to install and configure PostgreSQL for Very similar, and the concepts and Postgres specific configuration This guide applies primarily to Fedora Core. Now, when I enter the query myself instead of using \d, I get theĮxpected result of "(0 rows)", and Perl DBI will gladly tell me this LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespaceĪND pg_catalog.pg_table_is_visible(c.oid)ĭid not find any relation named "pfam_106". Instead I can echo the hidden commands, and get the SQL to Then I assume that the table does not exist. Perl DBI so I could just try a simple query and if I get an error, In my instance, I want to check to see if a table exists. You can further test this by entering the \d command and checking to Using the \set command alone will print the current values: Apparently for boolean variables, the fact If you use the -E argĮCHO_HIDDEN is set to 'on', so the designers had that in mind, but Not surprisingly, you can get away with simply setting ECHO_HIDDEN These commands are *not* terminated by a semicolon ( ). That means if you want to internally (while running psql) enable orĭisable echoing hidden commands, then use the \set command.
The psql man page is somewhat incomplete and says this:Įcho the actual queries generated by \d and otherīackslash commands. There are two groups of psql internal settings, and this little hintĬoncerns the second type, \set and \unset. They can be very useful even if they aren't really portable. Specific since they reference Postgres internal tables. The internal commands of psql (mostly?) generate SQL queries, but the
#POSTGRESQL COMMANDS DRIVER#
Includes info about the DBD/Pg error message.Įcho psql commands Quick install guide Install and upgrade checklist Driver and module solutions and error messages Postgres security and configuration in pg_hba.conf Command line notes SQL tricks, tab-separated, HTML output Why PostgreSQL is better than Oracle Echo psql commands Also an install/upgrade checklist, and pg_hba.conf configuration examples. Keywords:postgres,postgresql,install,upgrade,createdb,createuser,dropdb,shell,sql,feature,advanced,html,export,table,spreadsheet,date,conversion,unix,epoch,dbd,dbi,module,perl,cpan,yum,Pg,driver,ĭescription:Examples of PostgreSQL commands run from the shell, and some advanced SQL queries. Title:PostgreSQL command line psql, SQL tricks, pg_hba.conf configuration
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