Mail::SpamAssassin::BayesStore::SQL man page on YellowDog

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Mail::SpamAssassin::BaUsertContributed PMail::SpamAssassin::BayesStore::SQL(3)

NAME
       Mail::SpamAssassin::BayesStore::SQL - SQL Bayesian Storage Module
       Implementation

SYNOPSIS
DESCRIPTION
       This module implementes a SQL based bayesian storage module.

METHODS
       new

       public class (Mail::SpamAssassin::BayesStore::SQL) new (Mail::Spamas‐
       sassin::Bayes $bayes)

       Description: This methods creates a new instance of the Mail::SpamAs‐
       sassin::BayesStore::SQL object.	It expects to be passed an instance of
       the Mail::SpamAssassin:Bayes object which is passed into the Mail::Spa‐
       mAssassin::BayesStore parent object.

       This method sets up the database connection and determines the username
       to use in queries.

       tie_db_readonly

       public instance (Boolean) tie_db_readonly ();

       Description: This method ensures that the database connection is prop‐
       erly setup and working.	If necessary it will initialize a user's bayes
       variables so that they can begin using the database immediately.

       tie_db_writable

       public instance (Boolean) tie_db_writable ()

       Description: This method ensures that the database connetion is prop‐
       erly setup and working. If necessary it will initialize a users bayes
       variables so that they can begin using the database immediately.

       untie_db

       public instance () untie_db ()

       Description: This method is unused for the SQL based implementation.

       calculate_expire_delta

       public instance (%) calculate_expire_delta (Integer $newest_atime,
						    Integer $start,
						    Integer $max_expire_mult)

       Description: This method performs a calculation on the data to deter‐
       mine the optimum atime for token expiration.

       token_expiration

       public instance (Integer, Integer,
			Integer, Integer) token_expiration(\% $opts,
							   Integer $newdelta,
							   @ @vars)

       Description: This method performs the database specific expiration of
       tokens based on the passed in $newdelta and @vars.

       sync_due

       public instance (Boolean) sync_due ()

       Description: This method determines if a database sync is currently
       required.

       Unused for SQL based implementation.

       seen_get

       public instance (String) seen_get (string $msgid)

       Description: This method retrieves the stored value, if any, for
       $msgid.	The return value is the stored string ('s' for spam and 'h'
       for ham) or undef if $msgid is not found.

       seen_put

       public (Boolean) seen_put (string $msgid, char $flag)

       Description: This method records $msgid as the type given by $flag.
       $flag is one of two values 's' for spam and 'h' for ham.

       seen_delete

       public instance (Boolean) seen_delete (string $msgid)

       Description: This method removes $msgid from the database.

       get_storage_variables

       public instance (@) get_storage_variables ()

       Description: This method retrieves the various administrative variables
       used by the Bayes process and database.

       The values returned in the array are in the following order:

       0: scan count base

       1: number of spam

       2: number of ham

       3: number of tokens in db

       4: last expire atime

       5: oldest token in db atime

       6: db version value

       7: last journal sync

       8: last atime delta

       9: last expire reduction count

       10: newest token in db atime

       dump_db_toks

       public instance () dump_db_toks (String $template, String $regex, Array
       @vars)

       Description: This method loops over all tokens, computing the probabil‐
       ity for the token and then printing it out according to the passed in
       token.

       set_last_expire

       public instance (Boolean) set_last_expire (Integer $time)

       Description: This method sets the last expire time.

       get_running_expire_tok

       public instance (String $time) get_running_expire_tok ()

       Description: This method determines if an expire is currently running
       and returns the last time set.

       There can be multiple times, so we just pull the greatest (most recent)
       value.

       set_running_expire_tok

       public instance (String $time) set_running_expire_tok ()

       Description: This method sets the time that an expire starts running.

       remove_running_expire_tok

       public instance (Boolean) remove_running_expire_tok ()

       Description: This method removes the row in the database that indicates
       that and expire is currently running.

       tok_get

       public instance (Integer, Integer, Integer) tok_get (String $token)

       Description: This method retrieves a specificed token ($token) from the
       database and returns it's spam_count, ham_count and last access time.

       tok_get_all

       public instance (\@) tok_get (@ $tokens)

       Description: This method retrieves the specified tokens ($tokens) from
       storage and returns an array ref of arrays spam count, ham acount and
       last access time.

       tok_count_change

       public instance (Boolean) tok_count_change (Integer $spam_count,
				    Integer $ham_count,
				    String $token,
       String $atime)

       Description: This method takes a $spam_count and $ham_count and adds it
       to $tok along with updating $toks atime with $atime.

       multi_tok_count_change

       public instance (Boolean) multi_tok_count_change (Integer $spam_count,
					  Integer $ham_count,
					   \% $tokens,
					  String $atime)

       Description: This method takes a $spam_count and $ham_count and adds it
       to all of the tokens in the $tokens hash ref along with updating each
       tokens atime with $atime.

       nspam_nham_get

       public instance ($spam_count, $ham_count) nspam_nham_get ()

       Description: This method retrieves the total number of spam and the
       total number of ham learned.

       nspam_nham_change

       public instance (Boolean) nspam_nham_change (Integer $num_spam,
						    Integer $num_ham)

       Description: This method updates the number of spam and the number of
       ham in the database.

       tok_touch

       public instance (Boolean) tok_touch (String $token,
					    String $atime)

       Description: This method updates the given tokens ($token) atime.

       The assumption is that the token already exists in the database.

       tok_touch_all

       public instance (Boolean) tok_touch (\@ $tokens
					    String $atime)

       Description: This method does a mass update of the given list of tokens
       $tokens, if the existing token atime is < $atime.

       The assumption is that the tokens already exist in the database.

       We should never be touching more than N_SIGNIFICANT_TOKENS, so we can
       make some assumptions about how to handle the data (ie no need to batch
       like we do in tok_get_all)

       cleanup

       public instance (Boolean) cleanup ()

       Description: This method peroms any cleanup necessary before moving
       onto the next operation.

       get_magic_re

       public instance get_magic_re (String)

       Description: This method returns a regexp which indicates a magic
       token.

       Unused in SQL implementation.

       sync

       public instance (Boolean) sync (\% $opts)

       Description: This method performs a sync of the database

       perform_upgrade

       public instance (Boolean) perform_upgrade (\% $opts);

       Description: Performs an upgrade of the database from one version to
       another, not currently used in this implementation.

       clear_database

       public instance (Boolean) clear_database ()

       Description: This method deletes all records for a particular user.

       Callers should be aware that any errors returned by this method could
       causes the database to be inconsistent for the given user.

       backup_database

       public instance (Boolean) backup_database ()

       Description: This method will dump the users database in a marchine
       readable format.

       restore_database

       public instance (Boolean) restore_database (String $filename, Boolean
       $showdots)

       Description: This method restores a database from the given filename,
       $filename.

       Callers should be aware that any errors returned by this method could
       causes the database to be inconsistent for the given user.

       db_readable

       public instance (Boolean) db_readable()

       Description: This method returns a boolean value indicating if the
       database is in a readable state.

       db_writable

       public instance (Boolean) db_writeable()

       Description: This method returns a boolean value indicating if the
       database is in a writable state.

Private Methods
       _connect_db

       private instance (Boolean) _connect_db ()

       Description: This method connects to the SQL database.

       _get_db_version

       private instance (Integer) _get_db_version ()

       Description: Gets the current version of the database from the special
       global vars tables.

       _initialize_db

       private instance (Boolean) _initialize_db ()

       Description: This method will check to see if a user has had their
       bayes variables initialized. If not then it will perform this initial‐
       ization.

       _put_token

       private instance (Boolean) _put_token (string $token,
					      integer $spam_count,
					      integer $ham_count,
				  string $atime)

       Description: This method performs the work of either inserting or
       updating a token in the database.

       _put_tokens

       private instance (Boolean) _put_tokens (\% $tokens,
					       integer $spam_count,
					       integer $ham_count,
			     string $atime)

       Description: This method performs the work of either inserting or
       updating tokens in the database.

       _get_oldest_token_age

       private instance (Integer) _get_oldest_token_age ()

       Description: This method finds the atime of the oldest token in the
       database.

       The use of min(atime) in the SQL is ugly and but really the most effi‐
       cient way of getting the oldest_token_age after we've done a mass
       expire.	It should only be called at expire time.

       _get_num_hapaxes

       private instance (Integer) _get_num_hapaxes ()

       Description: This method gets the total number of hapaxes (spam_count +
       ham_count == 1) in the token database for a user.

       _get_num_lowfreq

       private instance (Integer) _get_num_lowfreq ()

       Description: This method gets the total number of lowfreq tokens
       (spam_count < 8 and ham_count < 8) in the token database for a user

       _token_select_string

       private instance (String) _token_select_string

       Description: This method returns the string to be used in SELECT state‐
       ments to represent the token column.

       The default is to use the RPAD function to pad the token out to 5 char‐
       acters.

perl v5.8.8			  2008-0Mail::SpamAssassin::BayesStore::SQL(3)
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