#++
# NAME
#	pgsql_table 5
# SUMMARY
#	Postfix PostgreSQL client configuration
# SYNOPSIS
#	\fBpostmap -q "\fIstring\fB" pgsql:/etc/postfix/filename\fR
#
#	\fBpostmap -q - pgsql:/etc/postfix/\fIfilename\fR <\fIinputfile\fR
# DESCRIPTION
#	The Postfix mail system uses optional tables for address
#	rewriting or mail routing. These tables are usually in
#	\fBdbm\fR or \fBdb\fR format.
#
#	Alternatively, lookup tables can be specified as PostgreSQL
#	databases.  In order to use PostgreSQL lookups, define a
#	PostgreSQL source as a lookup table in main.cf, for example:
# .ti +4
#	alias_maps = pgsql:/etc/pgsql-aliases.cf
#
#	The file /etc/postfix/pgsql-aliases.cf has the same format as
#	the Postfix main.cf file, and can specify the parameters
#	described below.
# ALTERNATIVE CONFIGURATION
# .ad
# .fi
#	For compatibility with other Postfix lookup tables, PostgreSQL
#	parameters can also be defined in main.cf.  In order to do
#	that, specify as PostgreSQL source a name that doesn't begin
#	with a slash or a dot.	The PostgreSQL parameters will then
#	be accessible as the name you've given the source in its
#	definition, an underscore, and the name of the parameter.  For
#	example, if the map is specified as "pgsql:\fIpgsqlname\fR",
#	the parameter "hosts" below would be defined in main.cf as
#	"\fIpgsqlname\fR_hosts".
#
#	Note: with this form, the passwords for the PostgreSQL sources
#	are written in main.cf, which is normally world-readable.
#	Support for this form will be removed in a future Postfix
#	version.
# LIST MEMBERSHIP
# .ad
# .fi
#	When using SQL to store lists such as $mynetworks,
#	$mydestination, $relay_domains, $local_recipient_maps,
#	etc., it is important to understand that the table must
#	store each list member as a separate key. The table lookup
#	verifies the *existence* of the key. See "Postfix lists
#	versus tables" in the DATABASE_README document for a
#	discussion.
#
#	Do NOT create tables that return the full list of domains
#	in $mydestination or $relay_domains etc., or IP addresses
#	in $mynetworks.
#
#	DO create tables with each matching item as a key and with
#	an arbitrary value. With SQL databases it is not uncommon to
#	return the key itself or a constant value.
# PGSQL PARAMETERS
# .ad
# .fi
# .IP "\fBhosts\fR"
#	The hosts that Postfix will try to connect to and query from.
#	Specify \fIunix:\fR for UNIX-domain sockets, \fIinet:\fR for TCP
#	connections (default).  Example:
# .ti +4
#	hosts = host1.some.domain host2.some.domain
# .ti +4
#	hosts = unix:/file/name
#
#	The hosts are tried in random order, with all connections over
#	UNIX domain sockets being tried before those over TCP.	The
#	connections are automatically closed after being idle for about
#	1 minute, and are re-opened as necessary.
#
#	NOTE: the \fIunix:\fR and \fIinet:\fR prefixes are accepted for
#	backwards compatibility reasons, but are actually ignored.
#	The PostgreSQL client library will always try to connect to an
#	UNIX socket if the name starts with a slash, and will try a TCP
#	connection otherwise.
# .IP "\fBuser, password\fR"
#	The user name and password to log into the pgsql server.
#	Example:
# .in +4
#	user = someone
# .br
#	password = some_password
# .in -4
# .IP "\fBdbname\fR"
#	The database name on the servers. Example:
# .ti +4
#	dbname = customer_database
# .PP
#	The following parameters can be used to fill in a SELECT
#	template statement of the form:
# .ti +4
#	select [\fBselect_field\fR] from [\fBtable\fR] where 
# .ti +8
#	[\fBwhere_field\fR] = '$lookup' [\fBadditional_conditions\fR]
#
#	$lookup contains the search string, and is escaped so if
#	it contains single quotes or other odd characters, it will
#	not cause a parse error, or worse, a security problem.
# .IP "\fBselect_field\fR"
#	The SQL "select" parameter. Example:
# .ti +4
#	select_field = forw_addr
# .IP "\fBtable\fR"
#	The SQL "select .. from" table name. Example:
# .ti +4
#	table = mxaliases
# .IP "\fBwhere_field\fR
#	The SQL "select .. where" parameter. Example:
# .ti +4
#	where_field = alias
# .IP "\fBadditional_conditions\fR
#	Additional conditions to the SQL query. Example:
# .ti +4
#	additional_conditions = and status = 'paid'
# .PP
#	The following parameters provide ways to override the default
#	SELECT statement.  Setting them will instruct Postfix to ignore
#	the above \fBtable\fR, \fBselect_field\fR, \fBwhere_field\fR and
#	\fBadditional_conditions\fR parameters:
# .IP "\fBquery\fR"
#	This parameter specifies a complete SQL query. Example:
# .ti +4
#	query = select forw_addr from mxaliases where 
# .ti +8
#	alias = '%s' and status = 'paid'
#
#	This parameter supports the following '%' expansions:
# .RS
# .IP "\fB\fB%s\fR\fR"
#	This is replaced by the input key. Quoting is used to make sure
#	that the input key does not add unexpected metacharacters.
# .IP "\fB\fB%u\fR\fR"
#	When the input key is an address of the form user@domain,
#	\fB%u\fR is replaced by the quoted local part of the address.
#	If no domain is specified, \fB%u\fR is replaced by the entire
#	search string.
# .IP "\fB\fB%d\fR\fR"
#	When the input key is an address of the form user@domain,
#	\fB%d\fR is replaced by the quoted domain part of the address.
#	When the input key has no domain qualifier, \fB%d\fR is replaced
#	by the entire search string.
# .RE
# .IP "\fBselect_function\fR"
#	This parameter specifies a database function name. Example:
# .ti +4
#	select_function = my_lookup_user_alias
#
#	This is equivalent to:
# .ti +4
#	query = select my_lookup_user_alias('%s')
#
#	and overrides both the \fBquery\fR parameter and the table-related
#	fields above.
#
#	As of June 2002, if the function returns a single row and
#	a single column AND that value is NULL, then the result
#	will be treated as if the key was not in the dictionary.
#
#	Future versions will allow functions to return result sets.
# SEE ALSO
#	postmap(1), Postfix lookup table manager
#	postconf(5), configuration parameters
#	ldap_table(5), LDAP lookup tables
#	mysql_table(5), MySQL lookup tables
# README FILES
# .ad
# .fi
#	Use "\fBpostconf readme_directory\fR" or
#	"\fBpostconf html_directory\fR" to locate this information.
# .na
# .nf
#	DATABASE_README, Postfix lookup table overview
#	PGSQL_README, Postfix PostgreSQL client guide
# LICENSE
# .ad
# .fi
#	The Secure Mailer license must be distributed with this software.
# HISTORY
#	PgSQL support was introduced with Postfix version 2.1.
# AUTHOR(S)
#	Based on the MySQL client by:
#	Scott Cotton, Joshua Marcus
#	IC Group, Inc.
#
#	Ported to PostgreSQL by:
#	Aaron Sethman
#
#	Further enhanced by:
#	Liviu Daia
#	Institute of Mathematics of the Romanian Academy
#	P.O. BOX 1-764
#	RO-014700 Bucharest, ROMANIA
#--
