CRM/Logging/Schema.php

   1 <?php
   2 /*
   3  +--------------------------------------------------------------------+
   4  | CiviCRM version 4.5                                                |
   5  +--------------------------------------------------------------------+
   6  | Copyright CiviCRM LLC (c) 2004-2014                                |
   7  +--------------------------------------------------------------------+
   8  | This file is a part of CiviCRM.                                    |
   9  |                                                                    |
  10  | CiviCRM is free software; you can copy, modify, and distribute it  |
  11  | under the terms of the GNU Affero General Public License           |
  12  | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
  13  |                                                                    |
  14  | CiviCRM is distributed in the hope that it will be useful, but     |
  15  | WITHOUT ANY WARRANTY; without even the implied warranty of         |
  16  | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
  17  | See the GNU Affero General Public License for more details.        |
  18  |                                                                    |
  19  | You should have received a copy of the GNU Affero General Public   |
  20  | License and the CiviCRM Licensing Exception along                  |
  21  | with this program; if not, contact CiviCRM LLC                     |
  22  | at info[AT]civicrm[DOT]org. If you have questions about the        |
  23  | GNU Affero General Public License or the licensing of CiviCRM,     |
  24  | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
  25  +--------------------------------------------------------------------+
  26 */
  27
  28 /**
  29  *
  30  * @package CRM
  31  * @copyright CiviCRM LLC (c) 2004-2014
  32  * $Id$
  33  *
  34  */
  35 class CRM_Logging_Schema {
  36   private $logs = array();
  37   private $tables = array();
  38
  39   private $db;
  40   private $useDBPrefix = TRUE;
  41
  42   private $reports = array(
  43     'logging/contact/detail',
  44     'logging/contact/summary',
  45     'logging/contribute/detail',
  46     'logging/contribute/summary',
  47   );
  48
  49   //CRM-13028 / NYSS-6933 - table => array (cols) - to be excluded from the update statement
  50   private $exceptions = array(
  51     'civicrm_job'   => array('last_run'),
  52     'civicrm_group' => array('cache_date'),
  53   );
  54
  55   /**
  56    * Populate $this->tables and $this->logs with current db state.
  57    */
  58   function __construct() {
  59     $dao = new CRM_Contact_DAO_Contact();
  60     $civiDBName = $dao->_database;
  61
  62     $dao = CRM_Core_DAO::executeQuery("
  63 SELECT TABLE_NAME
  64 FROM   INFORMATION_SCHEMA.TABLES
  65 WHERE  TABLE_SCHEMA = '{$civiDBName}'
  66 AND    TABLE_TYPE = 'BASE TABLE'
  67 AND    TABLE_NAME LIKE 'civicrm_%'
  68 ");
  69     while ($dao->fetch()) {
  70       $this->tables[] = $dao->TABLE_NAME;
  71     }
  72
  73     // do not log temp import, cache, menu and log tables
  74     $this->tables = preg_grep('/^civicrm_import_job_/', $this->tables, PREG_GREP_INVERT);
  75     $this->tables = preg_grep('/_cache$/', $this->tables, PREG_GREP_INVERT);
  76     $this->tables = preg_grep('/_log/', $this->tables, PREG_GREP_INVERT);
  77     $this->tables = preg_grep('/^civicrm_task_action_temp_/', $this->tables, PREG_GREP_INVERT);
  78     $this->tables = preg_grep('/^civicrm_export_temp_/', $this->tables, PREG_GREP_INVERT);
  79     $this->tables = preg_grep('/^civicrm_queue_/', $this->tables, PREG_GREP_INVERT);
  80     $this->tables = preg_grep('/^civicrm_menu/', $this->tables, PREG_GREP_INVERT); //CRM-14672
  81
  82     // do not log civicrm_mailing_event* tables, CRM-12300
  83     $this->tables = preg_grep('/^civicrm_mailing_event_/', $this->tables, PREG_GREP_INVERT);
  84
  85     if (defined('CIVICRM_LOGGING_DSN')) {
  86       $dsn = DB::parseDSN(CIVICRM_LOGGING_DSN);
  87       $this->useDBPrefix = (CIVICRM_LOGGING_DSN != CIVICRM_DSN);
  88     }
  89     else {
  90       $dsn = DB::parseDSN(CIVICRM_DSN);
  91       $this->useDBPrefix = FALSE;
  92     }
  93     $this->db = $dsn['database'];
  94
  95     $dao = CRM_Core_DAO::executeQuery("
  96 SELECT TABLE_NAME
  97 FROM   INFORMATION_SCHEMA.TABLES
  98 WHERE  TABLE_SCHEMA = '{$this->db}'
  99 AND    TABLE_TYPE = 'BASE TABLE'
 100 AND    TABLE_NAME LIKE 'log_civicrm_%'
 101 ");
 102     while ($dao->fetch()) {
 103       $log = $dao->TABLE_NAME;
 104       $this->logs[substr($log, 4)] = $log;
 105     }
 106   }
 107
 108   /**
 109    * Return logging custom data tables.
 110    */
 111   function customDataLogTables() {
 112     return preg_grep('/^log_civicrm_value_/', $this->logs);
 113   }
 114
 115   /**
 116    * Return custom data tables for specified entity / extends.
 117    */
 118   function entityCustomDataLogTables($extends) {
 119     $customGroupTables = array();
 120     $customGroupDAO = CRM_Core_BAO_CustomGroup::getAllCustomGroupsByBaseEntity($extends);
 121     $customGroupDAO->find();
 122     while ($customGroupDAO->fetch()) {
 123       $customGroupTables[$customGroupDAO->table_name] = $this->logs[$customGroupDAO->table_name];
 124     }
 125     return $customGroupTables;
 126   }
 127
 128   /**
 129    * Disable logging by dropping the triggers (but keep the log tables intact).
 130    */
 131   function disableLogging() {
 132     $config = CRM_Core_Config::singleton();
 133     $config->logging = FALSE;
 134
 135     $this->dropTriggers();
 136
 137     // invoke the meta trigger creation call
 138     CRM_Core_DAO::triggerRebuild();
 139
 140     $this->deleteReports();
 141   }
 142
 143   /**
 144    * Drop triggers for all logged tables.
 145    */
 146   function dropTriggers($tableName = NULL) {
 147     $dao = new CRM_Core_DAO;
 148
 149     if ($tableName) {
 150       $tableNames = array($tableName);
 151     }
 152     else {
 153       $tableNames = $this->tables;
 154     }
 155
 156     foreach ($tableNames as $table) {
 157       $validName = CRM_Core_DAO::shortenSQLName($table, 48, TRUE);
 158
 159       // before triggers
 160       $dao->executeQuery("DROP TRIGGER IF EXISTS {$validName}_before_insert");
 161       $dao->executeQuery("DROP TRIGGER IF EXISTS {$validName}_before_update");
 162       $dao->executeQuery("DROP TRIGGER IF EXISTS {$validName}_before_delete");
 163
 164      // after triggers
 165       $dao->executeQuery("DROP TRIGGER IF EXISTS {$validName}_after_insert");
 166       $dao->executeQuery("DROP TRIGGER IF EXISTS {$validName}_after_update");
 167       $dao->executeQuery("DROP TRIGGER IF EXISTS {$validName}_after_delete");
 168     }
 169
 170     // now lets also be safe and drop all triggers that start with
 171     // civicrm_ if we are dropping all triggers
 172     // we need to do this to capture all the leftover triggers since
 173     // we did the shortening trigger name for CRM-11794
 174     if ($tableName === NULL) {
 175       $triggers = $dao->executeQuery("SHOW TRIGGERS LIKE 'civicrm_%'");
 176
 177       while ($triggers->fetch()) {
 178         // note that drop trigger has a wierd syntax and hence we do not
 179         // send the trigger name as a string (i.e. its not quoted
 180         $dao->executeQuery("DROP TRIGGER IF EXISTS {$triggers->Trigger}");
 181       }
 182     }
 183   }
 184
 185   /**
 186    * Enable sitewide logging.
 187    *
 188    * @return void
 189    */
 190   function enableLogging() {
 191     $this->fixSchemaDifferences(TRUE);
 192     $this->addReports();
 193   }
 194
 195   /**
 196    * Sync log tables and rebuild triggers.
 197    *
 198    * @param bool $enableLogging: Ensure logging is enabled
 199    *
 200    * @return void
 201    */
 202   function fixSchemaDifferences($enableLogging = FALSE) {
 203     $config = CRM_Core_Config::singleton();
 204     if ($enableLogging) {
 205       $config->logging = TRUE;
 206     }
 207     if ($config->logging) {
 208       $this->fixSchemaDifferencesForALL();
 209     }
 210     // invoke the meta trigger creation call
 211     CRM_Core_DAO::triggerRebuild(NULL, TRUE);
 212   }
 213
 214   /**
 215    * Add missing (potentially specified) log table columns for the given table.
 216    *
 217    * @param $table string  name of the relevant table
 218    * @param $cols mixed    array of columns to add or null (to check for the missing columns)
 219    * @param $rebuildTrigger boolean should we rebuild the triggers
 220    *
 221    * @return void
 222    */
 223   function fixSchemaDifferencesFor($table, $cols = array(), $rebuildTrigger = FALSE) {
 224     if (empty($table)) {
 225       return FALSE;
 226     }
 227     if (empty($this->logs[$table])) {
 228       $this->createLogTableFor($table);
 229       return TRUE;
 230     }
 231
 232     if (empty($cols)) {
 233       $cols = $this->columnsWithDiffSpecs($table, "log_$table");
 234     }
 235
 236     // use the relevant lines from CREATE TABLE to add colums to the log table
 237     $create = $this->_getCreateQuery($table);
 238     foreach ((array('ADD', 'MODIFY')) as $alterType) {
 239       if (!empty($cols[$alterType])) {
 240         foreach ($cols[$alterType] as $col) {
 241           $line = $this->_getColumnQuery($col, $create);
 242           CRM_Core_DAO::executeQuery("ALTER TABLE `{$this->db}`.log_$table {$alterType} {$line}");
 243         }
 244       }
 245     }
 246
 247     // for any obsolete columns (not null) we just make the column nullable.
 248     if (!empty($cols['OBSOLETE'])) {
 249       $create = $this->_getCreateQuery("`{$this->db}`.log_{$table}");
 250       foreach ($cols['OBSOLETE'] as $col) {
 251         $line = $this->_getColumnQuery($col, $create);
 252         // This is just going to make a not null column to nullable
 253         CRM_Core_DAO::executeQuery("ALTER TABLE `{$this->db}`.log_$table MODIFY {$line}");
 254       }
 255     }
 256
 257     if ($rebuildTrigger) {
 258       // invoke the meta trigger creation call
 259       CRM_Core_DAO::triggerRebuild($table);
 260     }
 261     return TRUE;
 262   }
 263
 264   /**
 265    * @param $table
 266    *
 267    * @return array
 268    */
 269   private function _getCreateQuery($table) {
 270     $dao = CRM_Core_DAO::executeQuery("SHOW CREATE TABLE {$table}");
 271     $dao->fetch();
 272     $create = explode("\n", $dao->Create_Table);
 273     return $create;
 274   }
 275
 276   /**
 277    * @param $col
 278    * @param $createQuery
 279    *
 280    * @return array|mixed|string
 281    */
 282   private function _getColumnQuery($col, $createQuery) {
 283     $line = preg_grep("/^  `$col` /", $createQuery);
 284     $line = rtrim(array_pop($line), ',');
 285     // CRM-11179
 286     $line = $this->fixTimeStampAndNotNullSQL($line);
 287     return $line;
 288   }
 289
 290   /**
 291    * @param bool $rebuildTrigger
 292    */
 293   function fixSchemaDifferencesForAll($rebuildTrigger = FALSE) {
 294     $diffs = array();
 295     foreach ($this->tables as $table) {
 296       if (empty($this->logs[$table])) {
 297         $this->createLogTableFor($table);
 298       }
 299       else {
 300         $diffs[$table] = $this->columnsWithDiffSpecs($table, "log_$table");
 301       }
 302     }
 303
 304     foreach ($diffs as $table => $cols) {
 305       $this->fixSchemaDifferencesFor($table, $cols, FALSE);
 306     }
 307
 308     if ($rebuildTrigger) {
 309       // invoke the meta trigger creation call
 310       CRM_Core_DAO::triggerRebuild($table);
 311     }
 312   }
 313
 314   /*
 315    * log_civicrm_contact.modified_date for example would always be copied from civicrm_contact.modified_date,
 316    * so there's no need for a default timestamp and therefore we remove such default timestamps
 317    * also eliminate the NOT NULL constraint, since we always copy and schema can change down the road)
 318    */
 319   /**
 320    * @param $query
 321    *
 322    * @return mixed
 323    */
 324   function fixTimeStampAndNotNullSQL($query) {
 325     $query = str_ireplace("TIMESTAMP NOT NULL", "TIMESTAMP NULL", $query);
 326     $query = str_ireplace("DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP", '', $query);
 327     $query = str_ireplace("DEFAULT CURRENT_TIMESTAMP", '', $query);
 328     $query = str_ireplace("NOT NULL", '', $query);
 329     return $query;
 330   }
 331
 332   private function addReports() {
 333     $titles = array(
 334       'logging/contact/detail' => ts('Logging Details'),
 335       'logging/contact/summary' => ts('Contact Logging Report (Summary)'),
 336       'logging/contribute/detail' => ts('Contribution Logging Report (Detail)'),
 337       'logging/contribute/summary' => ts('Contribution Logging Report (Summary)'),
 338     );
 339     // enable logging templates
 340     CRM_Core_DAO::executeQuery("
 341             UPDATE civicrm_option_value
 342             SET is_active = 1
 343             WHERE value IN ('" . implode("', '", $this->reports) . "')
 344         ");
 345
 346     // add report instances
 347     $domain_id = CRM_Core_Config::domainID();
 348     foreach ($this->reports as $report) {
 349       $dao             = new CRM_Report_DAO_ReportInstance;
 350       $dao->domain_id  = $domain_id;
 351       $dao->report_id  = $report;
 352       $dao->title      = $titles[$report];
 353       $dao->permission = 'administer CiviCRM';
 354       if ($report == 'logging/contact/summary')
 355         $dao->is_reserved = 1;
 356       $dao->insert();
 357     }
 358   }
 359
 360   /**
 361    * Get an array of column names of the given table.
 362    */
 363   private function columnsOf($table, $force = FALSE) {
 364     static $columnsOf = array();
 365
 366     $from = (substr($table, 0, 4) == 'log_') ? "`{$this->db}`.$table" : $table;
 367
 368     if (!isset($columnsOf[$table]) || $force) {
 369       $errorScope = CRM_Core_TemporaryErrorScope::ignoreException();
 370       $dao = CRM_Core_DAO::executeQuery("SHOW COLUMNS FROM $from");
 371       if (is_a($dao, 'DB_Error')) {
 372         return array();
 373       }
 374       $columnsOf[$table] = array();
 375       while ($dao->fetch()) {
 376         $columnsOf[$table][] = $dao->Field;
 377       }
 378     }
 379
 380     return $columnsOf[$table];
 381   }
 382
 383   /**
 384    * Get an array of columns and their details like DATA_TYPE, IS_NULLABLE, COLUMN_DEFAULT for the given table.
 385    */
 386   private function columnSpecsOf($table) {
 387     static $columnSpecs = array(), $civiDB = NULL;
 388
 389     if (empty($columnSpecs)) {
 390       if (!$civiDB) {
 391         $dao = new CRM_Contact_DAO_Contact();
 392         $civiDB = $dao->_database;
 393       }
 394       $errorScope = CRM_Core_TemporaryErrorScope::ignoreException();
 395       // NOTE: W.r.t Performance using one query to find all details and storing in static array is much faster
 396       // than firing query for every given table.
 397       $query = "
 398 SELECT TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, DATA_TYPE, IS_NULLABLE, COLUMN_DEFAULT
 399 FROM   INFORMATION_SCHEMA.COLUMNS
 400 WHERE  table_schema IN ('{$this->db}', '{$civiDB}')";
 401       $dao = CRM_Core_DAO::executeQuery($query);
 402       if (is_a($dao, 'DB_Error')) {
 403         return array();
 404       }
 405       while ($dao->fetch()) {
 406         if (!array_key_exists($dao->TABLE_NAME, $columnSpecs)) {
 407           $columnSpecs[$dao->TABLE_NAME] = array();
 408         }
 409         $columnSpecs[$dao->TABLE_NAME][$dao->COLUMN_NAME] =
 410           array(
 411               'COLUMN_NAME' => $dao->COLUMN_NAME,
 412               'DATA_TYPE'   => $dao->DATA_TYPE,
 413               'IS_NULLABLE' => $dao->IS_NULLABLE,
 414               'COLUMN_DEFAULT' => $dao->COLUMN_DEFAULT
 415             );
 416       }
 417     }
 418     return $columnSpecs[$table];
 419   }
 420
 421   /**
 422    * @param $civiTable
 423    * @param $logTable
 424    *
 425    * @return array
 426    */
 427   function columnsWithDiffSpecs($civiTable, $logTable) {
 428     $civiTableSpecs = $this->columnSpecsOf($civiTable);
 429     $logTableSpecs  = $this->columnSpecsOf($logTable);
 430
 431     $diff = array('ADD' => array(), 'MODIFY' => array(), 'OBSOLETE' => array());
 432
 433     // columns to be added
 434     $diff['ADD'] = array_diff(array_keys($civiTableSpecs), array_keys($logTableSpecs));
 435
 436     // columns to be modified
 437     // NOTE: we consider only those columns for modifications where there is a spec change, and that the column definition
 438     // wasn't deliberately modified by fixTimeStampAndNotNullSQL() method.
 439     foreach ($civiTableSpecs as $col => $colSpecs) {
 440       if (!isset($logTableSpecs[$col]) || !is_array($logTableSpecs[$col]) ) {
 441         $logTableSpecs[$col] = array();
 442       }
 443
 444       $specDiff = array_diff($civiTableSpecs[$col], $logTableSpecs[$col]);
 445       if (!empty($specDiff) && $col != 'id' && !array_key_exists($col, $diff['ADD'])) {
 446         // ignore 'id' column for any spec changes, to avoid any auto-increment mysql errors
 447         if ($civiTableSpecs[$col]['DATA_TYPE'] != CRM_Utils_Array::value('DATA_TYPE', $logTableSpecs[$col])) {
 448           // if data-type is different, surely consider the column
 449           $diff['MODIFY'][] = $col;
 450         } else if ($civiTableSpecs[$col]['IS_NULLABLE'] != CRM_Utils_Array::value('IS_NULLABLE', $logTableSpecs[$col]) &&
 451           $logTableSpecs[$col]['IS_NULLABLE'] == 'NO') {
 452           // if is-null property is different, and log table's column is NOT-NULL, surely consider the column
 453           $diff['MODIFY'][] = $col;
 454         } else if ($civiTableSpecs[$col]['COLUMN_DEFAULT'] != CRM_Utils_Array::value('COLUMN_DEFAULT', $logTableSpecs[$col]) &&
 455           !strstr($civiTableSpecs[$col]['COLUMN_DEFAULT'], 'TIMESTAMP')) {
 456           // if default property is different, and its not about a timestamp column, consider it
 457           $diff['MODIFY'][] = $col;
 458         }
 459       }
 460     }
 461
 462     // columns to made obsolete by turning into not-null
 463     $oldCols = array_diff(array_keys($logTableSpecs), array_keys($civiTableSpecs));
 464     foreach ($oldCols as $col) {
 465       if (!in_array($col, array('log_date', 'log_conn_id', 'log_user_id', 'log_action')) &&
 466         $logTableSpecs[$col]['IS_NULLABLE'] == 'NO') {
 467         // if its a column present only in log table, not among those used by log tables for special purpose, and not-null
 468         $diff['OBSOLETE'][] = $col;
 469       }
 470     }
 471
 472     return $diff;
 473   }
 474
 475   /**
 476    * Create a log table with schema mirroring the given table’s structure and seeding it with the given table’s contents.
 477    */
 478   private function createLogTableFor($table) {
 479     $dao = CRM_Core_DAO::executeQuery("SHOW CREATE TABLE $table");
 480     $dao->fetch();
 481     $query = $dao->Create_Table;
 482
 483     // rewrite the queries into CREATE TABLE queries for log tables:
 484     $cols = <<<COLS
 485             log_date    TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
 486             log_conn_id INTEGER,
 487             log_user_id INTEGER,
 488             log_action  ENUM('Initialization', 'Insert', 'Update', 'Delete')
 489 COLS;
 490
 491     // - prepend the name with log_
 492     // - drop AUTO_INCREMENT columns
 493     // - drop non-column rows of the query (keys, constraints, etc.)
 494     // - set the ENGINE to ARCHIVE
 495     // - add log-specific columns (at the end of the table)
 496     $query = preg_replace("/^CREATE TABLE `$table`/i", "CREATE TABLE `{$this->db}`.log_$table", $query);
 497     $query = preg_replace("/ AUTO_INCREMENT/i", '', $query);
 498     $query = preg_replace("/^  [^`].*$/m", '', $query);
 499     $query = preg_replace("/^\) ENGINE=[^ ]+ /im", ') ENGINE=ARCHIVE ', $query);
 500
 501     // log_civicrm_contact.modified_date for example would always be copied from civicrm_contact.modified_date,
 502     // so there's no need for a default timestamp and therefore we remove such default timestamps
 503     // also eliminate the NOT NULL constraint, since we always copy and schema can change down the road)
 504     $query = self::fixTimeStampAndNotNullSQL($query);
 505     $query = preg_replace("/^\) /m", "$cols\n) ", $query);
 506
 507     CRM_Core_DAO::executeQuery($query);
 508
 509     $columns = implode(', ', $this->columnsOf($table));
 510     CRM_Core_DAO::executeQuery("INSERT INTO `{$this->db}`.log_$table ($columns, log_conn_id, log_user_id, log_action) SELECT $columns, CONNECTION_ID(), @civicrm_user_id, 'Initialization' FROM {$table}");
 511
 512     $this->tables[] = $table;
 513     $this->logs[$table] = "log_$table";
 514   }
 515
 516   private function deleteReports() {
 517     // disable logging templates
 518     CRM_Core_DAO::executeQuery("
 519             UPDATE civicrm_option_value
 520             SET is_active = 0
 521             WHERE value IN ('" . implode("', '", $this->reports) . "')
 522         ");
 523
 524     // delete report instances
 525     $domain_id = CRM_Core_Config::domainID();
 526     foreach ($this->reports as $report) {
 527       $dao            = new CRM_Report_DAO_ReportInstance;
 528       $dao->domain_id = $domain_id;
 529       $dao->report_id = $report;
 530       $dao->delete();
 531     }
 532   }
 533
 534   /**
 535    * Predicate whether logging is enabled.
 536    */
 537   public function isEnabled() {
 538     $config = CRM_Core_Config::singleton();
 539
 540     if ($config->logging) {
 541       return $this->tablesExist() and $this->triggersExist();
 542     }
 543     return FALSE;
 544   }
 545
 546   /**
 547    * Predicate whether any log tables exist.
 548    */
 549   private function tablesExist() {
 550     return !empty($this->logs);
 551   }
 552
 553   /**
 554    * Predicate whether the logging triggers are in place.
 555    */
 556   private function triggersExist() {
 557     // FIXME: probably should be a bit more thorough…
 558     // note that the LIKE parameter is TABLE NAME
 559     return (bool) CRM_Core_DAO::singleValueQuery("SHOW TRIGGERS LIKE 'civicrm_contact'");
 560   }
 561
 562   /**
 563    * @param $info
 564    * @param null $tableName
 565    * @param bool $force
 566    */
 567   function triggerInfo(&$info, $tableName = NULL, $force = FALSE) {
 568     // check if we have logging enabled
 569     $config =& CRM_Core_Config::singleton();
 570     if (!$config->logging) {
 571       return;
 572     }
 573
 574     $insert = array('INSERT');
 575     $update = array('UPDATE');
 576     $delete = array('DELETE');
 577
 578     if ($tableName) {
 579       $tableNames = array($tableName);
 580     }
 581     else {
 582       $tableNames = $this->tables;
 583     }
 584
 585     // logging is enabled, so now lets create the trigger info tables
 586     foreach ($tableNames as $table) {
 587       $columns = $this->columnsOf($table, $force);
 588
 589       // only do the change if any data has changed
 590       $cond = array( );
 591       foreach ($columns as $column) {
 592         // ignore modified_date changes
 593         if ($column != 'modified_date' && !in_array($column, CRM_Utils_Array::value($table, $this->exceptions, array()))) {
 594           $cond[] = "IFNULL(OLD.$column,'') <> IFNULL(NEW.$column,'')";
 595         }
 596       }
 597       $suppressLoggingCond = "@civicrm_disable_logging IS NULL OR @civicrm_disable_logging = 0";
 598       $updateSQL = "IF ( (" . implode( ' OR ', $cond ) . ") AND ( $suppressLoggingCond ) ) THEN ";
 599
 600       if ($this->useDBPrefix) {
 601         $sqlStmt = "INSERT INTO `{$this->db}`.log_{tableName} (";
 602       }
 603       else {
 604         $sqlStmt = "INSERT INTO log_{tableName} (";
 605       }
 606       foreach ($columns as $column) {
 607         $sqlStmt .= "$column, ";
 608       }
 609       $sqlStmt .= "log_conn_id, log_user_id, log_action) VALUES (";
 610
 611       $insertSQL = $deleteSQL = "IF ( $suppressLoggingCond ) THEN $sqlStmt ";
 612       $updateSQL .= $sqlStmt;
 613
 614       $sqlStmt = '';
 615       foreach ($columns as $column) {
 616         $sqlStmt   .= "NEW.$column, ";
 617         $deleteSQL .= "OLD.$column, ";
 618       }
 619       $sqlStmt   .= "CONNECTION_ID(), @civicrm_user_id, '{eventName}');";
 620       $deleteSQL .= "CONNECTION_ID(), @civicrm_user_id, '{eventName}');";
 621
 622       $sqlStmt   .= "END IF;";
 623       $deleteSQL .= "END IF;";
 624
 625       $insertSQL .= $sqlStmt;
 626       $updateSQL .= $sqlStmt;
 627
 628       $info[] = array(
 629         'table' => array($table),
 630         'when' => 'AFTER',
 631         'event' => $insert,
 632         'sql' => $insertSQL,
 633       );
 634
 635       $info[] = array(
 636         'table' => array($table),
 637         'when' => 'AFTER',
 638         'event' => $update,
 639         'sql' => $updateSQL,
 640       );
 641
 642       $info[] = array(
 643         'table' => array($table),
 644         'when' => 'AFTER',
 645         'event' => $delete,
 646         'sql' => $deleteSQL,
 647       );
 648     }
 649   }
 650
 651   /**
 652    * This allow logging to be temporarily disabled for certain cases
 653    * where we want to do a mass cleanup but dont want to bother with
 654    * an audit trail
 655    *
 656    * @static
 657    * @public
 658    */
 659   static function disableLoggingForThisConnection( ) {
 660     // do this only if logging is enabled
 661     $config = CRM_Core_Config::singleton( );
 662     if ( $config->logging ) {
 663       CRM_Core_DAO::executeQuery( 'SET @civicrm_disable_logging = 1' );
 664     }
 665   }
 666
 667 }
 668