MYSQL_TABLE(5)		      File Formats Manual		MYSQL_TABLE(5)



NAME
       mysql_table - Postfix MySQL client configuration

SYNOPSIS
       postmap -q "string" mysql:/etc/postfix/filename

       postmap -q - mysql:/etc/postfix/filename <inputfile

DESCRIPTION
       The  Postfix  mail system uses optional tables for address rewriting or
       mail routing. These tables are usually in dbm or db format.

       Alternatively, lookup tables can be specified as MySQL  databases.   In
       order  to use MySQL lookups, define a MySQL source as a lookup table in
       main.cf, for example:
	   alias_maps = mysql:/etc/mysql-aliases.cf

       The file /etc/postfix/mysql-aliases.cf has the same format as the Post-
       fix main.cf file, and can specify the parameters described below.

BACKWARDS COMPATIBILITY
       For  compatibility  with	 other Postfix lookup tables, MySQL parameters
       can also be defined in main.cf.	In order to do that, specify as	 MySQL
       source  a  name	that  doesn't  begin with a slash or a dot.  The MySQL
       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  "mysql:mysqlname",	the  parameter
       "hosts" below would be defined in main.cf as "mysqlname_hosts".

       Note:  with  this form, the passwords for the MySQL sources are written
       in main.cf, which is normally world-readable.  Support  for  this  form
       will be removed in a future Postfix version.

       Postfix	2.2  has  enhanced  query interfaces for MySQL and PostgreSQL;
       these include features previously available only in  the	 Postfix  LDAP
       client.	In  the	 new interface the SQL query is specified via a single
       query parameter (described in more detail below).  When the  new	 query
       parameter  is  not  specified in the map definition, Postfix reverts to
       the  old	 interface,  with  the	SQL   query   constructed   from   the
       select_field,  table, where_field and additional_conditions parameters.
       The old interface will be gradually phased out. To migrate to  the  new
       interface set:

	   query = SELECT [select_field]
	       FROM [table]
	       WHERE [where_field] = '%s'
		   [additional_conditions]

       Insert the value, not the name, of each legacy parameter. Note that the
       additional_conditions parameter is optional  and	 if  not  empty,  will
       always start with AND.

LIST MEMBERSHIP
       When  using  SQL	 to  store  lists such as $mynetworks, $mydestination,
       $relay_domains, $local_recipient_maps, etc., it is important to	under-
       stand 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 $mydesti-
       nation 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.

MYSQL PARAMETERS
       hosts  The hosts that Postfix will try to connect to  and  query	 from.
	      Specify unix: for UNIX domain sockets, inet: for TCP connections
	      (default).  Example:
		  hosts = host1.some.domain host2.some.domain
		  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 con-
	      nections are automatically closed after being idle for  about  1
	      minute, and are re-opened as necessary. Postfix versions 2.0 and
	      earlier do not randomize the host order.

	      NOTE: if you specify localhost as a hostname (even if you prefix
	      it  with	inet:),	 MySQL will connect to the default UNIX domain
	      socket.  In order to instruct MySQL to connect to localhost over
	      TCP you have to specify
		  hosts = 127.0.0.1

       user, password
	      The  user name and password to log into the mysql server.	 Exam-
	      ple:
		  user = someone
		  password = some_password

       dbname The database name on the servers. Example:
		  dbname = customer_database

       query  The SQL query template used to search the database, where %s  is
	      a substitute for the address Postfix is trying to resolve, e.g.
		  query = SELECT replacement FROM aliases WHERE mailbox = '%s'

	      This parameter supports the following '%' expansions:

	      %%     This is replaced by a literal '%' character.

	      %s     This  is  replaced by the input key.  SQL quoting is used
		     to make sure that the input key does not  add  unexpected
		     metacharacters.

	      %u     When the input key is an address of the form user@domain,
		     %u is replaced by	the  SQL  quoted  local	 part  of  the
		     address.	Otherwise, %u is replaced by the entire search
		     string.  If the localpart is empty,  the  query  is  sup-
		     pressed and returns no results.

	      %d     When the input key is an address of the form user@domain,
		     %d is replaced by the  SQL	 quoted	 domain	 part  of  the
		     address.	Otherwise, the query is suppressed and returns
		     no results.

	      %[SUD] The upper-case equivalents of the above expansions behave
		     in	 the  query  parameter identically to their lower-case
		     counter-parts.  With  the	result_format  parameter  (see
		     below),  they expand the input key rather than the result
		     value.

	      %[1-9] The patterns %1, %2, ... %9 are replaced  by  the	corre-
		     sponding  most  significant  component of the input key's
		     domain. If the input key is  user@mail.example.com,  then
		     %1 is com, %2 is example and %3 is mail. If the input key
		     is unqualified or does not have enough domain  components
		     to	 satisfy all the specified patterns, the query is sup-
		     pressed and returns no results.

	      The domain parameter described below limits the  input  keys  to
	      addresses in matching domains. When the domain parameter is non-
	      empty, SQL queries for unqualified  addresses  or	 addresses  in
	      non-matching domains are suppressed and return no results.

	      This  parameter is available with Postfix 2.2. In prior releases
	      the  SQL	query  was  built  from	  the	separate   parameters:
	      select_field,  table, where_field and additional_conditions. The
	      mapping from the old parameters to the equivalent query is:

		  SELECT [select_field]
		  FROM [table]
		  WHERE [where_field] = '%s'
			[additional_conditions]

	      The '%s' in the WHERE  clause  expands  to  the  escaped	search
	      string.	With  Postfix  2.2 these legacy parameters are used if
	      the query parameter is not specified.

	      NOTE: DO NOT put quotes around the query parameter.

       result_format (default: %s)
	      Format template applied to result attributes. Most commonly used
	      to  append  (or prepend) text to the result. This parameter sup-
	      ports the following '%' expansions:

	      %%     This is replaced by a literal '%' character.

	      %s     This is replaced by the value of  the  result  attribute.
		     When result is empty it is skipped.

	      %u     When the result attribute value is an address of the form
		     user@domain, %u is replaced by  the  local	 part  of  the
		     address.  When  the  result  has an empty localpart it is
		     skipped.

	      %d     When a result attribute value is an address of  the  form
		     user@domain,  %d  is  replaced  by the domain part of the
		     attribute value. When the result  is  unqualified	it  is
		     skipped.

	      %[SUD1-9]
		     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 query, 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.

	      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 %s 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!

       domain (default: no domain list)
	      This is a list of domain names, paths to files, or dictionaries.
	      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 MySQL server.
		  domain = postfix.org, hash:/etc/postfix/searchdomains

	      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.

       expansion_limit (default: 0)
	      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 QUERY INTERFACE
       This  section  describes	 an interface that is deprecated as of Postfix
       2.2. It is replaced by  the  more  general  query  interface  described
       above.	If  the	 query	parameter  is  defined,	 the legacy parameters
       described here ignored.	Please migrate to the  new  interface  as  the
       legacy interface may be removed in a future release.

       The  following  parameters  can	be  used  to fill in a SELECT template
       statement of the form:

	   SELECT [select_field]
	   FROM [table]
	   WHERE [where_field] = '%s'
		 [additional_conditions]

       The specifier %s is replaced by 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.

       select_field
	      The SQL "select" parameter. Example:
		  select_field = forw_addr

       table  The SQL "select .. from" table name. Example:
		  table = mxaliases

       where_field
	      The SQL "select .. where" parameter. Example:
		  where_field = alias

       additional_conditions
	      Additional conditions to the SQL query. Example:
		  additional_conditions = AND status = 'paid'

SEE ALSO
       postmap(1), Postfix lookup table maintenance
       postconf(5), configuration parameters
       ldap_table(5), LDAP lookup tables
       pgsql_table(5), PostgreSQL lookup tables

README FILES
       Use "postconf readme_directory" or "postconf html_directory" to	locate
       this information.
       DATABASE_README, Postfix lookup table overview
       MYSQL_README, Postfix MYSQL client guide

LICENSE
       The Secure Mailer license must be distributed with this software.

HISTORY
       MySQL support was introduced with Postfix version 1.0.

AUTHOR(S)
       Original implementation by:
       Scott Cotton, Joshua Marcus
       IC Group, Inc.

       Further enhancements by:
       Liviu Daia
       Institute of Mathematics of the Romanian Academy
       P.O. BOX 1-764
       RO-014700 Bucharest, ROMANIA



								MYSQL_TABLE(5)