Man pages sections > man3 > App::Info::RDBMS::PostgreSQL

App::Info::RDBMS::PostgreSQL - Information about PostgreSQL

App::Info::RDBMS::PostgreSQL(3pm) User Contributed Perl Documentation App::Info::RDBMS::PostgreSQL(3pm)

NAME

App::Info::RDBMS::PostgreSQL - Information about PostgreSQL

SYNOPSIS

  use App::Info::RDBMS::PostgreSQL;
  my $pg = App::Info::RDBMS::PostgreSQL->new;
  if ($pg->installed) {
      print "App name: ", $pg->name, "\n";
      print "Version:  ", $pg->version, "\n";
      print "Bin dir:  ", $pg->bin_dir, "\n";
  } else {
      print "PostgreSQL is not installed. :-(\n";
  }

DESCRIPTION

App::Info::RDBMS::PostgreSQL supplies information about the PostgreSQL database server installed on the local system. It implements all of the methods defined by App::Info::RDBMS. Methods that trigger events will trigger them only the first time they're called (See App::Info for documentation on handling events). To start over (after, say, someone has installed PostgreSQL) construct a new App::Info::RDBMS::PostgreSQL object to aggregate new meta data.
Some of the methods trigger the same events. This is due to cross-calling of shared subroutines. However, any one event should be triggered no more than once. For example, although the info event "Executing `pg_config --version`" is documented for the methods "name()", "version()", "major_version()", "minor_version()", and "patch_version()", rest assured that it will only be triggered once, by whichever of those four methods is called first.

INTERFACE

Constructor

new
  my $pg = App::Info::RDBMS::PostgreSQL->new(@params);
Returns an App::Info::RDBMS::PostgreSQL object. See App::Info for a complete description of argument parameters.
When it called, "new()" searches the file system for an executable named for the list returned by "search_exe_names()", usually pg_config, in the list of directories returned by "search_bin_dirs()". If found, pg_config will be called by the object methods below to gather the data necessary for each. If pg_config cannot be found, then PostgreSQL is assumed not to be installed, and each of the object methods will return "undef".
"new()" also takes a number of optional parameters in addition to those documented for App::Info. These parameters allow you to specify alternate names for PostgreSQL executables (other than pg_config, which you specify via the "search_exe_names" parameter). These parameters are:
search_postgres_names
search_createdb_names
search_createlang_names
search_createuser_names
search_dropd_names
search_droplang_names
search_dropuser_names
search_initdb_names
search_pg_dump_names
search_pg_dumpall_names
search_pg_restore_names
search_postmaster_names
search_psql_names
search_vacuumdb_names
Events:
info
Looking for pg_config
confirm
Path to pg_config?
unknown
Path to pg_config?

Class Method

key_name
  my $key_name = App::Info::RDBMS::PostgreSQL->key_name;
Returns the unique key name that describes this class. The value returned is the string "PostgreSQL".

Object Methods

installed
  print "PostgreSQL is ", ($pg->installed ? '' : 'not '), "installed.\n";
Returns true if PostgreSQL is installed, and false if it is not. App::Info::RDBMS::PostgreSQL determines whether PostgreSQL is installed based on the presence or absence of the pg_config application on the file system as found when "new()" constructed the object. If PostgreSQL does not appear to be installed, then all of the other object methods will return empty values.
name
  my $name = $pg->name;
Returns the name of the application. App::Info::RDBMS::PostgreSQL parses the name from the system call "`pg_config --version`".
Events:
info
Executing `pg_config --version`
error
Failed to find PostgreSQL version with `pg_config --version`
 
Unable to parse name from string
 
Unable to parse version from string
 
Failed to parse PostgreSQL version parts from string
unknown
Enter a valid PostgreSQL name
version
  my $version = $pg->version;
Returns the PostgreSQL version number. App::Info::RDBMS::PostgreSQL parses the version number from the system call "`pg_config --version`".
Events:
info
Executing `pg_config --version`
error
Failed to find PostgreSQL version with `pg_config --version`
 
Unable to parse name from string
 
Unable to parse version from string
 
Failed to parse PostgreSQL version parts from string
unknown
Enter a valid PostgreSQL version number
major version
  my $major_version = $pg->major_version;
Returns the PostgreSQL major version number. App::Info::RDBMS::PostgreSQL parses the major version number from the system call "`pg_config --version`". For example, if "version()" returns "7.1.2", then this method returns "7".
Events:
info
Executing `pg_config --version`
error
Failed to find PostgreSQL version with `pg_config --version`
 
Unable to parse name from string
 
Unable to parse version from string
 
Failed to parse PostgreSQL version parts from string
unknown
Enter a valid PostgreSQL major version number
minor version
  my $minor_version = $pg->minor_version;
Returns the PostgreSQL minor version number. App::Info::RDBMS::PostgreSQL parses the minor version number from the system call "`pg_config --version`". For example, if "version()" returns "7.1.2", then this method returns "2".
Events:
info
Executing `pg_config --version`
error
Failed to find PostgreSQL version with `pg_config --version`
 
Unable to parse name from string
 
Unable to parse version from string
 
Failed to parse PostgreSQL version parts from string
unknown
Enter a valid PostgreSQL minor version number
patch version
  my $patch_version = $pg->patch_version;
Returns the PostgreSQL patch version number. App::Info::RDBMS::PostgreSQL parses the patch version number from the system call "`pg_config --version`". For example, if "version()" returns "7.1.2", then this method returns "1".
Events:
info
Executing `pg_config --version`
error
Failed to find PostgreSQL version with `pg_config --version`
 
Unable to parse name from string
 
Unable to parse version from string
 
Failed to parse PostgreSQL version parts from string
unknown
Enter a valid PostgreSQL minor version number
executable
  my $exe = $pg->executable;
Returns the full path to the PostgreSQL server executable, which is named postgres. This method does not use the executable names returned by "search_exe_names()"; those executable names are used to search for pg_config only (in "new()").
When it called, "executable()" checks for an executable named postgres in the directory returned by "bin_dir()".
Note that "executable()" is simply an alias for "postgres()".
Events:
info
Looking for postgres executable
confirm
Path to postgres executable?
unknown
Path to postgres executable?
bin_dir
  my $bin_dir = $pg->bin_dir;
Returns the PostgreSQL binary directory path. App::Info::RDBMS::PostgreSQL gathers the path from the system call "`pg_config --bindir`".
Events:
info
Executing `pg_config --bindir`
error
Cannot find bin directory
unknown
Enter a valid PostgreSQL bin directory
inc_dir
  my $inc_dir = $pg->inc_dir;
Returns the PostgreSQL include directory path. App::Info::RDBMS::PostgreSQL gathers the path from the system call "`pg_config --includedir`".
Events:
info
Executing `pg_config --includedir`
error
Cannot find include directory
unknown
Enter a valid PostgreSQL include directory
lib_dir
  my $lib_dir = $pg->lib_dir;
Returns the PostgreSQL library directory path. App::Info::RDBMS::PostgreSQL gathers the path from the system call "`pg_config --libdir`".
Events:
info
Executing `pg_config --libdir`
error
Cannot find library directory
unknown
Enter a valid PostgreSQL library directory
so_lib_dir
  my $so_lib_dir = $pg->so_lib_dir;
Returns the PostgreSQL shared object library directory path. App::Info::RDBMS::PostgreSQL gathers the path from the system call "`pg_config --pkglibdir`".
Events:
info
Executing `pg_config --pkglibdir`
error
Cannot find shared object library directory
unknown
Enter a valid PostgreSQL shared object library directory
configure options
  my $configure = $pg->configure;
Returns the options with which the PostgreSQL server was configured. App::Info::RDBMS::PostgreSQL gathers the configure data from the system call "`pg_config --configure`".
Events:
info
Executing `pg_config --configure`
error
Cannot find configure information
unknown
Enter PostgreSQL configuration options
home_url
  my $home_url = $pg->home_url;
Returns the PostgreSQL home page URL.
download_url
  my $download_url = $pg->download_url;
Returns the PostgreSQL download URL.
search_exe_names
  my @search_exe_names = $app->search_exe_names;
Returns a list of possible names for pg_config executable. By default, only pg_config is returned (or pg_config.exe on Win32).
Note that this method is not used to search for the PostgreSQL server executable, only pg_config.
search_bin_dirs
  my @search_bin_dirs = $app->search_bin_dirs;
Returns a list of possible directories in which to search an executable. Used by the "new()" constructor to find an executable to execute and collect application info. The found directory will also be returned by the "bin_dir" method.
The list of directories by default consists of the path as defined by "File::Spec->path", as well as the following directories:
$ENV{POSTGRES_HOME}/bin (if $ENV{POSTGRES_HOME} exists)
$ENV{POSTGRES_LIB}/../bin (if $ENV{POSTGRES_LIB} exists)
/usr/local/pgsql/bin
/usr/local/postgres/bin
/opt/pgsql/bin
/usr/local/bin
/usr/local/sbin
/usr/bin
/usr/sbin
/bin
C:\Program Files\PostgreSQL\bin

Other Executable Methods

These methods function just like the "executable()" method, except that they return different executables. PostgreSQL comes with a fair number of them; we provide these methods to provide a path to a subset of them. Each method, when called, checks for an executable in the directory returned by "bin_dir()". The name of the executable must be one of the names returned by the corresponding "search_*_names" method.
The available executable methods are:
postgres
createdb
createlang
createuser
dropdb
droplang
dropuser
initdb
pg_dump
pg_dumpall
pg_restore
postmaster
psql
vacuumdb
And the corresponding search names methods are:
search_postgres_names
search_createdb_names
search_createlang_names
search_createuser_names
search_dropd_names
search_droplang_names
search_dropuser_names
search_initdb_names
search_pg_dump_names
search_pg_dumpall_names
search_pg_restore_names
search_postmaster_names
search_psql_names
search_vacuumdb_names
Events:
info
Looking for executable
confirm
Path to executable?
unknown
Path to executable?

SUPPORT

This module is stored in an open GitHub repository <http://github.com/theory/app-info/>. Feel free to fork and contribute!
Please file bug reports via GitHub Issues <http://github.com/theory/app-info/issues/> or by sending mail to bug-App-Info@rt.cpan.org <mailto:bug-App-Info@rt.cpan.org>.

AUTHOR

David E. Wheeler <david@justatheory.com> based on code by Sam Tregar <sam@tregar.com>.

SEE ALSO

App::Info documents the event handling interface.
App::Info::RDBMS is the App::Info::RDBMS::PostgreSQL parent class.
DBD::Pg is the DBI driver for connecting to PostgreSQL databases.
<http://www.postgresql.org/> is the PostgreSQL home page. Copyright (c) 2002-2011, David E. Wheeler. Some Rights Reserved.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
2015-06-06 perl v5.20.2