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.\" ========================================================================
.\"
.IX Title "App::Info::RDBMS::PostgreSQL 3pm"
.TH App::Info::RDBMS::PostgreSQL 3pm "2022-12-06" "perl v5.36.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
App::Info::RDBMS::PostgreSQL \- Information about PostgreSQL
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use App::Info::RDBMS::PostgreSQL;
\&
\&  my $pg = App::Info::RDBMS::PostgreSQL\->new;
\&
\&  if ($pg\->installed) {
\&      print "App name: ", $pg\->name, "\en";
\&      print "Version:  ", $pg\->version, "\en";
\&      print "Bin dir:  ", $pg\->bin_dir, "\en";
\&  } else {
\&      print "PostgreSQL is not installed. :\-(\en";
\&  }
.Ve
.SH "DESCRIPTION"
.IX Header "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.
.PP
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 \*(L"Executing `pg_config \-\-version`\*(R"
is documented for the methods \f(CW\*(C`name()\*(C'\fR, \f(CW\*(C`version()\*(C'\fR, \f(CW\*(C`major_version()\*(C'\fR,
\&\f(CW\*(C`minor_version()\*(C'\fR, and \f(CW\*(C`patch_version()\*(C'\fR, rest assured that it will only be
triggered once, by whichever of those four methods is called first.
.SH "INTERFACE"
.IX Header "INTERFACE"
.SS "Constructor"
.IX Subsection "Constructor"
\fInew\fR
.IX Subsection "new"
.PP
.Vb 1
\&  my $pg = App::Info::RDBMS::PostgreSQL\->new(@params);
.Ve
.PP
Returns an App::Info::RDBMS::PostgreSQL object. See App::Info for
a complete description of argument parameters.
.PP
When it called, \f(CW\*(C`new()\*(C'\fR searches the file system for an executable named for
the list returned by \f(CW\*(C`search_exe_names()\*(C'\fR, usually \fIpg_config\fR, in the list
of directories returned by \f(CW\*(C`search_bin_dirs()\*(C'\fR. If found, \fIpg_config\fR will
be called by the object methods below to gather the data necessary for
each. If \fIpg_config\fR cannot be found, then PostgreSQL is assumed not to be
installed, and each of the object methods will return \f(CW\*(C`undef\*(C'\fR.
.PP
\&\f(CW\*(C`new()\*(C'\fR 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 \fIpg_config\fR, which you specify
via the \f(CW\*(C`search_exe_names\*(C'\fR parameter). These parameters are:
.IP "search_postgres_names" 4
.IX Item "search_postgres_names"
.PD 0
.IP "search_createdb_names" 4
.IX Item "search_createdb_names"
.IP "search_createlang_names" 4
.IX Item "search_createlang_names"
.IP "search_createuser_names" 4
.IX Item "search_createuser_names"
.IP "search_dropd_names" 4
.IX Item "search_dropd_names"
.IP "search_droplang_names" 4
.IX Item "search_droplang_names"
.IP "search_dropuser_names" 4
.IX Item "search_dropuser_names"
.IP "search_initdb_names" 4
.IX Item "search_initdb_names"
.IP "search_pg_dump_names" 4
.IX Item "search_pg_dump_names"
.IP "search_pg_dumpall_names" 4
.IX Item "search_pg_dumpall_names"
.IP "search_pg_restore_names" 4
.IX Item "search_pg_restore_names"
.IP "search_postmaster_names" 4
.IX Item "search_postmaster_names"
.IP "search_psql_names" 4
.IX Item "search_psql_names"
.IP "search_vacuumdb_names" 4
.IX Item "search_vacuumdb_names"
.PD
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Looking for pg_config
.IP "confirm" 4
.IX Item "confirm"
Path to pg_config?
.IP "unknown" 4
.IX Item "unknown"
Path to pg_config?
.SS "Class Method"
.IX Subsection "Class Method"
\fIkey_name\fR
.IX Subsection "key_name"
.PP
.Vb 1
\&  my $key_name = App::Info::RDBMS::PostgreSQL\->key_name;
.Ve
.PP
Returns the unique key name that describes this class. The value returned is
the string \*(L"PostgreSQL\*(R".
.SS "Object Methods"
.IX Subsection "Object Methods"
\fIinstalled\fR
.IX Subsection "installed"
.PP
.Vb 1
\&  print "PostgreSQL is ", ($pg\->installed ? \*(Aq\*(Aq : \*(Aqnot \*(Aq), "installed.\en";
.Ve
.PP
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 \fIpg_config\fR application on the file system
as found when \f(CW\*(C`new()\*(C'\fR constructed the object. If PostgreSQL does not appear
to be installed, then all of the other object methods will return empty
values.
.PP
\fIname\fR
.IX Subsection "name"
.PP
.Vb 1
\&  my $name = $pg\->name;
.Ve
.PP
Returns the name of the application. App::Info::RDBMS::PostgreSQL parses the
name from the system call \f(CW\*(C`\`pg_config \-\-version\`\*(C'\fR.
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Executing `pg_config \-\-version`
.IP "error" 4
.IX Item "error"
Failed to find PostgreSQL version with `pg_config \-\-version`
.Sp
Unable to parse name from string
.Sp
Unable to parse version from string
.Sp
Failed to parse PostgreSQL version parts from string
.IP "unknown" 4
.IX Item "unknown"
Enter a valid PostgreSQL name
.PP
\fIversion\fR
.IX Subsection "version"
.PP
.Vb 1
\&  my $version = $pg\->version;
.Ve
.PP
Returns the PostgreSQL version number. App::Info::RDBMS::PostgreSQL parses the
version number from the system call \f(CW\*(C`\`pg_config \-\-version\`\*(C'\fR.
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Executing `pg_config \-\-version`
.IP "error" 4
.IX Item "error"
Failed to find PostgreSQL version with `pg_config \-\-version`
.Sp
Unable to parse name from string
.Sp
Unable to parse version from string
.Sp
Failed to parse PostgreSQL version parts from string
.IP "unknown" 4
.IX Item "unknown"
Enter a valid PostgreSQL version number
.PP
\fImajor version\fR
.IX Subsection "major version"
.PP
.Vb 1
\&  my $major_version = $pg\->major_version;
.Ve
.PP
Returns the PostgreSQL major version number. App::Info::RDBMS::PostgreSQL
parses the major version number from the system call \f(CW\*(C`\`pg_config \-\-version\`\*(C'\fR.
For example, if \f(CW\*(C`version()\*(C'\fR returns \*(L"7.1.2\*(R", then this method returns \*(L"7\*(R".
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Executing `pg_config \-\-version`
.IP "error" 4
.IX Item "error"
Failed to find PostgreSQL version with `pg_config \-\-version`
.Sp
Unable to parse name from string
.Sp
Unable to parse version from string
.Sp
Failed to parse PostgreSQL version parts from string
.IP "unknown" 4
.IX Item "unknown"
Enter a valid PostgreSQL major version number
.PP
\fIminor version\fR
.IX Subsection "minor version"
.PP
.Vb 1
\&  my $minor_version = $pg\->minor_version;
.Ve
.PP
Returns the PostgreSQL minor version number. App::Info::RDBMS::PostgreSQL
parses the minor version number from the system call \f(CW\*(C`\`pg_config \-\-version\`\*(C'\fR.
For example, if \f(CW\*(C`version()\*(C'\fR returns \*(L"7.1.2\*(R", then this method returns \*(L"2\*(R".
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Executing `pg_config \-\-version`
.IP "error" 4
.IX Item "error"
Failed to find PostgreSQL version with `pg_config \-\-version`
.Sp
Unable to parse name from string
.Sp
Unable to parse version from string
.Sp
Failed to parse PostgreSQL version parts from string
.IP "unknown" 4
.IX Item "unknown"
Enter a valid PostgreSQL minor version number
.PP
\fIpatch version\fR
.IX Subsection "patch version"
.PP
.Vb 1
\&  my $patch_version = $pg\->patch_version;
.Ve
.PP
Returns the PostgreSQL patch version number. App::Info::RDBMS::PostgreSQL
parses the patch version number from the system call \f(CW\*(C`\`pg_config \-\-version\`\*(C'\fR.
For example, if \f(CW\*(C`version()\*(C'\fR returns \*(L"7.1.2\*(R", then this method returns \*(L"1\*(R".
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Executing `pg_config \-\-version`
.IP "error" 4
.IX Item "error"
Failed to find PostgreSQL version with `pg_config \-\-version`
.Sp
Unable to parse name from string
.Sp
Unable to parse version from string
.Sp
Failed to parse PostgreSQL version parts from string
.IP "unknown" 4
.IX Item "unknown"
Enter a valid PostgreSQL minor version number
.PP
\fIexecutable\fR
.IX Subsection "executable"
.PP
.Vb 1
\&  my $exe = $pg\->executable;
.Ve
.PP
Returns the full path to the PostgreSQL server executable, which is named
\&\fIpostgres\fR.  This method does not use the executable names returned by
\&\f(CW\*(C`search_exe_names()\*(C'\fR; those executable names are used to search for
\&\fIpg_config\fR only (in \f(CW\*(C`new()\*(C'\fR).
.PP
When it called, \f(CW\*(C`executable()\*(C'\fR checks for an executable named \fIpostgres\fR in
the directory returned by \f(CW\*(C`bin_dir()\*(C'\fR.
.PP
Note that \f(CW\*(C`executable()\*(C'\fR is simply an alias for \f(CW\*(C`postgres()\*(C'\fR.
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Looking for postgres executable
.IP "confirm" 4
.IX Item "confirm"
Path to postgres executable?
.IP "unknown" 4
.IX Item "unknown"
Path to postgres executable?
.PP
\fIbin_dir\fR
.IX Subsection "bin_dir"
.PP
.Vb 1
\&  my $bin_dir = $pg\->bin_dir;
.Ve
.PP
Returns the PostgreSQL binary directory path. App::Info::RDBMS::PostgreSQL
gathers the path from the system call \f(CW\*(C`\`pg_config \-\-bindir\`\*(C'\fR.
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Executing `pg_config \-\-bindir`
.IP "error" 4
.IX Item "error"
Cannot find bin directory
.IP "unknown" 4
.IX Item "unknown"
Enter a valid PostgreSQL bin directory
.PP
\fIinc_dir\fR
.IX Subsection "inc_dir"
.PP
.Vb 1
\&  my $inc_dir = $pg\->inc_dir;
.Ve
.PP
Returns the PostgreSQL include directory path. App::Info::RDBMS::PostgreSQL
gathers the path from the system call \f(CW\*(C`\`pg_config \-\-includedir\`\*(C'\fR.
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Executing `pg_config \-\-includedir`
.IP "error" 4
.IX Item "error"
Cannot find include directory
.IP "unknown" 4
.IX Item "unknown"
Enter a valid PostgreSQL include directory
.PP
\fIlib_dir\fR
.IX Subsection "lib_dir"
.PP
.Vb 1
\&  my $lib_dir = $pg\->lib_dir;
.Ve
.PP
Returns the PostgreSQL library directory path. App::Info::RDBMS::PostgreSQL
gathers the path from the system call \f(CW\*(C`\`pg_config \-\-libdir\`\*(C'\fR.
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Executing `pg_config \-\-libdir`
.IP "error" 4
.IX Item "error"
Cannot find library directory
.IP "unknown" 4
.IX Item "unknown"
Enter a valid PostgreSQL library directory
.PP
\fIso_lib_dir\fR
.IX Subsection "so_lib_dir"
.PP
.Vb 1
\&  my $so_lib_dir = $pg\->so_lib_dir;
.Ve
.PP
Returns the PostgreSQL shared object library directory path.
App::Info::RDBMS::PostgreSQL gathers the path from the system call
\&\f(CW\*(C`\`pg_config \-\-pkglibdir\`\*(C'\fR.
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Executing `pg_config \-\-pkglibdir`
.IP "error" 4
.IX Item "error"
Cannot find shared object library directory
.IP "unknown" 4
.IX Item "unknown"
Enter a valid PostgreSQL shared object library directory
.PP
\fIconfigure options\fR
.IX Subsection "configure options"
.PP
.Vb 1
\&  my $configure = $pg\->configure;
.Ve
.PP
Returns the options with which the PostgreSQL server was
configured. App::Info::RDBMS::PostgreSQL gathers the configure data from the
system call \f(CW\*(C`\`pg_config \-\-configure\`\*(C'\fR.
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Executing `pg_config \-\-configure`
.IP "error" 4
.IX Item "error"
Cannot find configure information
.IP "unknown" 4
.IX Item "unknown"
Enter PostgreSQL configuration options
.PP
\fIhome_url\fR
.IX Subsection "home_url"
.PP
.Vb 1
\&  my $home_url = $pg\->home_url;
.Ve
.PP
Returns the PostgreSQL home page \s-1URL.\s0
.PP
\fIdownload_url\fR
.IX Subsection "download_url"
.PP
.Vb 1
\&  my $download_url = $pg\->download_url;
.Ve
.PP
Returns the PostgreSQL download \s-1URL.\s0
.PP
\fIsearch_exe_names\fR
.IX Subsection "search_exe_names"
.PP
.Vb 1
\&  my @search_exe_names = $app\->search_exe_names;
.Ve
.PP
Returns a list of possible names for \fIpg_config\fR executable. By default, only
\&\fIpg_config\fR is returned (or \fIpg_config.exe\fR on Win32).
.PP
Note that this method is not used to search for the PostgreSQL server
executable, only \fIpg_config\fR.
.PP
\fIsearch_bin_dirs\fR
.IX Subsection "search_bin_dirs"
.PP
.Vb 1
\&  my @search_bin_dirs = $app\->search_bin_dirs;
.Ve
.PP
Returns a list of possible directories in which to search an executable. Used
by the \f(CW\*(C`new()\*(C'\fR constructor to find an executable to execute and collect
application info. The found directory will also be returned by the \f(CW\*(C`bin_dir\*(C'\fR
method.
.PP
The list of directories by default consists of the path as defined by
\&\f(CW\*(C`File::Spec\->path\*(C'\fR, as well as the following directories:
.ie n .IP "$ENV{\s-1POSTGRES_HOME\s0}/bin (if $ENV{\s-1POSTGRES_HOME\s0} exists)" 4
.el .IP "\f(CW$ENV\fR{\s-1POSTGRES_HOME\s0}/bin (if \f(CW$ENV\fR{\s-1POSTGRES_HOME\s0} exists)" 4
.IX Item "$ENV{POSTGRES_HOME}/bin (if $ENV{POSTGRES_HOME} exists)"
.PD 0
.ie n .IP "$ENV{\s-1POSTGRES_LIB\s0}/../bin (if $ENV{\s-1POSTGRES_LIB\s0} exists)" 4
.el .IP "\f(CW$ENV\fR{\s-1POSTGRES_LIB\s0}/../bin (if \f(CW$ENV\fR{\s-1POSTGRES_LIB\s0} exists)" 4
.IX Item "$ENV{POSTGRES_LIB}/../bin (if $ENV{POSTGRES_LIB} exists)"
.IP "/usr/local/pgsql/bin" 4
.IX Item "/usr/local/pgsql/bin"
.IP "/usr/local/postgres/bin" 4
.IX Item "/usr/local/postgres/bin"
.IP "/opt/pgsql/bin" 4
.IX Item "/opt/pgsql/bin"
.IP "/usr/local/bin" 4
.IX Item "/usr/local/bin"
.IP "/usr/local/sbin" 4
.IX Item "/usr/local/sbin"
.IP "/usr/bin" 4
.IX Item "/usr/bin"
.IP "/usr/sbin" 4
.IX Item "/usr/sbin"
.IP "/bin" 4
.IX Item "/bin"
.IP "C:\eProgram Files\ePostgreSQL\ebin" 4
.IX Item "C:Program FilesPostgreSQLbin"
.PD
.SS "Other Executable Methods"
.IX Subsection "Other Executable Methods"
These methods function just like the \f(CW\*(C`executable()\*(C'\fR 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 \f(CW\*(C`bin_dir()\*(C'\fR.
The name of the executable must be one of the names returned by the
corresponding \f(CW\*(C`search_*_names\*(C'\fR method.
.PP
The available executable methods are:
.IP "postgres" 4
.IX Item "postgres"
.PD 0
.IP "createdb" 4
.IX Item "createdb"
.IP "createlang" 4
.IX Item "createlang"
.IP "createuser" 4
.IX Item "createuser"
.IP "dropdb" 4
.IX Item "dropdb"
.IP "droplang" 4
.IX Item "droplang"
.IP "dropuser" 4
.IX Item "dropuser"
.IP "initdb" 4
.IX Item "initdb"
.IP "pg_dump" 4
.IX Item "pg_dump"
.IP "pg_dumpall" 4
.IX Item "pg_dumpall"
.IP "pg_restore" 4
.IX Item "pg_restore"
.IP "postmaster" 4
.IX Item "postmaster"
.IP "psql" 4
.IX Item "psql"
.IP "vacuumdb" 4
.IX Item "vacuumdb"
.PD
.PP
And the corresponding search names methods are:
.IP "search_postgres_names" 4
.IX Item "search_postgres_names"
.PD 0
.IP "search_createdb_names" 4
.IX Item "search_createdb_names"
.IP "search_createlang_names" 4
.IX Item "search_createlang_names"
.IP "search_createuser_names" 4
.IX Item "search_createuser_names"
.IP "search_dropd_names" 4
.IX Item "search_dropd_names"
.IP "search_droplang_names" 4
.IX Item "search_droplang_names"
.IP "search_dropuser_names" 4
.IX Item "search_dropuser_names"
.IP "search_initdb_names" 4
.IX Item "search_initdb_names"
.IP "search_pg_dump_names" 4
.IX Item "search_pg_dump_names"
.IP "search_pg_dumpall_names" 4
.IX Item "search_pg_dumpall_names"
.IP "search_pg_restore_names" 4
.IX Item "search_pg_restore_names"
.IP "search_postmaster_names" 4
.IX Item "search_postmaster_names"
.IP "search_psql_names" 4
.IX Item "search_psql_names"
.IP "search_vacuumdb_names" 4
.IX Item "search_vacuumdb_names"
.PD
.PP
\&\fBEvents:\fR
.IP "info" 4
.IX Item "info"
Looking for executable
.IP "confirm" 4
.IX Item "confirm"
Path to executable?
.IP "unknown" 4
.IX Item "unknown"
Path to executable?
.SH "SUPPORT"
.IX Header "SUPPORT"
This module is stored in an open GitHub
repository <http://github.com/theory/app-info/>. Feel free to fork and
contribute!
.PP
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>.
.SH "AUTHOR"
.IX Header "AUTHOR"
David E. Wheeler <david@justatheory.com> based on code by Sam Tregar
<sam@tregar.com>.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
App::Info documents the event handling interface.
.PP
App::Info::RDBMS is the App::Info::RDBMS::PostgreSQL
parent class.
.PP
DBD::Pg is the \s-1DBI\s0 driver for connecting to PostgreSQL
databases.
.PP
<http://www.postgresql.org/> is the PostgreSQL home page.
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright (c) 2002\-2011, David E. Wheeler. Some Rights Reserved.
.PP
This module is free software; you can redistribute it and/or modify it under the
same terms as Perl itself.