#++
# NAME
#	pgsql_table 5
# SUMMARY
#	Postfix PostgreSQL client configuration
# SYNOPSIS
#	\fBpostmap -q "\fIstring\fB" pgsql:/etc/postfix/\fIfilename\fR
#
#	\fBpostmap -q - pgsql:/etc/postfix/\fIfilename\fB <\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:
# .nf
#	    alias_maps = pgsql:/etc/postfix/pgsql-aliases.cf
# .fi
#
#	The file /etc/postfix/pgsql-aliases.cf has the same format as
#	the Postfix main.cf file, and can specify the parameters
#	described below.
# 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. Besides a PostgreSQL connection URI, this
#	setting supports the historical forms \fBunix:/\fIpathname\fR
#	for UNIX-domain sockets and \fBinet:\fIhost:port\fR for TCP
#	connections, where the \fBunix:\fR and \fBinet:\fR prefixes
#	are accepted and ignored for backwards compatibility.
#	Examples:
# .nf
#	    hosts = postgresql://username@example.com/\fIdatabasename\fR?sslmode=require
#	    hosts = postgres://user:secret@localhost
#	    hosts = inet:host1.some.domain inet:host2.some.domain:port
#	    hosts = host1.some.domain host2.some.domain:port
#	    hosts = unix:/file/name
# .fi
#
#	See https://www.postgresql.org/docs/current/libpq-connect.html
#	for the supported connection URI syntax.
#
#	The hosts are tried in random order. The connections are
#	automatically closed after being idle for about 1 minute,
#	and are re-opened as necessary. See \fBidle_interval\fR
#	for details.
#
#	NOTE: if the \fBhosts\fR setting specifies a PostgreSQL connection
#	URI, the Postfix PostgreSQL client will ignore the \fBdbname\fR,
#	\fBuser\fR, and \fBpassword\fR settings for that connection.
#
#	NOTE: if the \fBhosts\fR setting specifies one server, this client
#	assumes that the target is a load balancer and will reconnect
#	immediately after a single failure, instead of failing all
#	requests temporarily. With older versions of this client,
#	specify the same server twice.
# .IP "\fBuser\fR"
# .IP "\fBpassword\fR"
#	The user name and password to log into the pgsql server.
#	Example:
# .nf
#	    user = someone
#	    password = some_password
# .fi
# .sp
#	The \fBuser\fR and \fBpassword\fR settings are ignored for
#	\fBhosts\fR connections that are specified as an URI.
# .IP "\fBdbname\fR"
#	The database name on the servers. Example:
# .nf
#	    dbname = customer_database
# .fi
# .sp
#	The \fBdbname\fR setting is ignored for \fBhosts\fR connections
#	that are specified as an URI.
#
#	The \fBdbname\fR setting is required with Postfix 3.10 and later,
#	when \fBhosts\fR specifies any non-URI connection; it is always
#	required with earlier Postfix versions.
# .IP "\fBencoding\fR"
#	The encoding used by the database client. The default setting
#	is:
# .nf
#	    encoding = UTF8
# .fi
#
#	Historically, the database client was hard coded to use
#	LATIN1 in an attempt to disable multibyte character support.
#
#	This feature is available in Postfix 3.8 and later.
# .IP "\fBidle_interval (default: 60)\fR"
#	The number of seconds after which an idle database connection
#	will be closed.
#
#	This feature is available in Postfix 3.9 and later.
# .IP "\fBretry_interval (default: 60)\fR"
#	The number of seconds that a database connection will be
#	skipped after an error.
#
#	NOTE: if the \fBhosts\fR setting specifies one server, this client
#	assumes that the target is a load balancer and will reconnect
#	immediately after a single failure, instead of failing all
#	requests temporarily. With older versions of this client,
#	specify the same server twice.
#
#	This feature is available in Postfix 3.9 and later.
# .IP "\fBquery\fR"
#	The SQL query template used to search the database, where \fB%s\fR
#	is a substitute for the address Postfix is trying to resolve,
#	e.g.
# .nf
#	    query = SELECT replacement FROM aliases WHERE mailbox = '%s'
# .fi
#
#	This parameter supports the following '%' expansions:
# .RS
# .IP "\fB%%\fR"
#	This is replaced by a literal '%' character. (Postfix 2.2 and later)
# .IP "\fB%s\fR"
#	This is replaced by the input key.
#	SQL quoting is used to make sure that the input key does not
#	add unexpected metacharacters.
# .IP "\fB%u\fR"
#	When the input key is an address of the form user@domain, \fB%u\fR
#	is replaced by the SQL quoted local part of the address.
#	Otherwise, \fB%u\fR is replaced by the entire search string.
#	If the localpart is empty, the query is suppressed and returns
#	no results.
# .IP "\fB%d\fR"
#	When the input key is an address of the form user@domain, \fB%d\fR
#	is replaced by the SQL quoted domain part of the address.
#	Otherwise, the query is suppressed and returns no results.
# .IP "\fB%[SUD]\fR"
#	The upper-case equivalents of the above expansions behave in the
#	\fBquery\fR parameter identically to their lower-case counter-parts.
#	With the \fBresult_format\fR parameter (see below), they expand the
#	input key rather than the result value.
# .IP
#	The above %S, %U and %D expansions are available with Postfix 2.2
#	and later
# .IP "\fB%[1-9]\fR"
#	The patterns %1, %2, ... %9 are replaced by the corresponding
#	most significant component of the input key's domain. If the
#	input key is \fIuser@mail.example.com\fR, then %1 is \fBcom\fR,
#	%2 is \fBexample\fR and %3 is \fBmail\fR. If the input key is
#	unqualified or does not have enough domain components to satisfy
#	all the specified patterns, the query is suppressed and returns
#	no results.
# .IP
#	The above %1, ... %9 expansions are available with Postfix 2.2
#	and later
# .RE
# .IP
#	The \fBdomain\fR parameter described below limits the input
#	keys to addresses in matching domains. When the \fBdomain\fR
#	parameter is non-empty, SQL queries for unqualified addresses
#	or addresses in non-matching domains are suppressed
#	and return no results.
#
#	The precedence of this parameter has changed with Postfix 2.2,
#	in prior releases the precedence was, from highest to lowest,
#	\fBselect_function\fR, \fBquery\fR, \fBselect_field\fR, ...
#
#	With Postfix 2.2 the \fBquery\fR parameter has highest precedence,
#	see OBSOLETE QUERY INTERFACES below.
#
#	NOTE: DO NOT put quotes around the \fBquery\fR parameter.
# .IP "\fBresult_format (default: \fB%s\fR)\fR"
#	Format template applied to result attributes. Most commonly used
#	to append (or prepend) text to the result. This parameter supports
#	the following '%' expansions:
# .RS
# .IP "\fB%%\fR"
#	This is replaced by a literal '%' character.
# .IP "\fB%s\fR"
#	This is replaced by the value of the result attribute. When
#	result is empty it is skipped.
# .IP "\fB%u\fR
#	When the result attribute value is an address of the form
#	user@domain, \fB%u\fR is replaced by the local part of the
#	address. When the result has an empty localpart it is skipped.
# .IP "\fB%d\fR"
#	When a result attribute value is an address of the form
#	user@domain, \fB%d\fR is replaced by the domain part of
#	the attribute value. When the result is unqualified it
#	is skipped.
# .IP "\fB%[SUD1-9]\fR"
#	The upper-case and decimal digit expansions interpolate
#	the parts of the input key rather than the result. Their
#	behavior is identical to that described with \fBquery\fR,
#	and in fact because the input key is known in advance, queries
#	whose key does not contain all the information specified in
#	the result template are suppressed and return no results.
# .RE
# .IP
#	For example, using "result_format = smtp:[%s]" allows one
#	to use a mailHost attribute as the basis of a transport(5)
#	table. After applying the result format, multiple values
#	are concatenated as comma separated strings. The expansion_limit
#	and parameter explained below allows one to restrict the number
#	of values in the result, which is especially useful for maps that
#	must return at most one value.
#
#	The default value \fB%s\fR specifies that each result value should
#	be used as is.
#
#	This parameter is available with Postfix 2.2 and later.
#
#	NOTE: DO NOT put quotes around the result format!
# .IP "\fBdomain (default: no domain list)\fR"
#	This is a list of domain names, paths to files, or "type:table"
#	databases. When specified, only fully qualified search
#	keys with a *non-empty* localpart and a matching domain
#	are eligible for lookup: 'user' lookups, bare domain lookups
#	and "@domain" lookups are not performed. This can significantly
#	reduce the query load on the PostgreSQL server.
# .nf
#	    domain = postfix.org, hash:/etc/postfix/searchdomains
# .fi
#
#	It is best not to use SQL to store the domains eligible
#	for SQL lookups.
#
#	This parameter is available with Postfix 2.2 and later.
#
#	NOTE: DO NOT define this parameter for local(8) aliases,
#	because the input keys are always unqualified.
# .IP "\fBexpansion_limit (default: 0)\fR"
#     A limit on the total number of result elements returned
#     (as a comma separated list) by a lookup against the map.
#     A setting of zero disables the limit. Lookups fail with a
#     temporary error if the limit is exceeded.  Setting the
#     limit to 1 ensures that lookups do not return multiple
#     values.
# OBSOLETE MAIN.CF PARAMETERS
# .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" 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.
# OBSOLETE QUERY INTERFACES
# .ad
# .fi
#	This section describes query interfaces that are deprecated
#	as of Postfix 2.2.  Please migrate to the new \fBquery\fR
#	interface as the old interfaces are slated to be phased
#	out.
# .IP "\fBselect_function\fR"
#	This parameter specifies a database function name. Example:
# .nf
#	    select_function = my_lookup_user_alias
# .fi
#
#	This is equivalent to:
# .nf
#	    query = SELECT my_lookup_user_alias('%s')
# .fi
#
#	This parameter overrides the legacy table-related fields (described
#	below). With Postfix versions prior to 2.2, it also overrides the
#	\fBquery\fR parameter. Starting with Postfix 2.2, the \fBquery\fR
#	parameter has highest precedence, and the \fBselect_function\fR
#	parameter is deprecated.
# .PP
#	The following parameters (with lower precedence than the
#	\fBselect_function\fR interface described above) can be used to
#	build the SQL select statement as follows:
#
# .nf
#	    SELECT [\fBselect_field\fR]
#	    FROM [\fBtable\fR]
#	    WHERE [\fBwhere_field\fR] = '%s'
#	          [\fBadditional_conditions\fR]
# .fi
#
#	The specifier %s is replaced with each lookup by the lookup key
#	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.
#
#	Starting with Postfix 2.2, this interface is obsoleted by the more
#	general \fBquery\fR interface described above. If higher precedence
#	the \fBquery\fR or \fBselect_function\fR parameters described above
#	are defined, the parameters described here are ignored.
# .IP "\fBselect_field\fR"
#	The SQL "select" parameter. Example:
# .nf
#	    \fBselect_field\fR = forw_addr
# .fi
# .IP "\fBtable\fR"
#	The SQL "select .. from" table name. Example:
# .nf
#	    \fBtable\fR = mxaliases
# .fi
# .IP "\fBwhere_field\fR
#	The SQL "select .. where" parameter. Example:
# .nf
#	    \fBwhere_field\fR = alias
# .fi
# .IP "\fBadditional_conditions\fR
#	Additional conditions to the SQL query. Example:
# .nf
#	    \fBadditional_conditions\fR = AND status = 'paid'
# .fi
# SEE ALSO
#	postmap(1), Postfix lookup table manager
#	postconf(5), configuration parameters
#	ldap_table(5), LDAP lookup tables
#	mysql_table(5), MySQL lookup tables
#	sqlite_table(5), SQLite 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
#--
