CRM/Core/Reference/Dynamic.php

   1 <?php
   2
   3 /**
   4  * Description of a one-way link between two entities
   5  *
   6  * This is a generic, soft-foreign key based on a pair of columns (entity_id, entity_table).
   7  */
   8 class CRM_Core_Reference_Dynamic extends CRM_Core_Reference_Basic {
   9
  10   public function matchesTargetTable($tableName) {
  11     return TRUE;
  12   }
  13
  14   /**
  15    * Create a query to find references to a particular record
  16    *
  17    * @param CRM_Core_DAO $targetDao the instance for which we want references
  18    * @return CRM_Core_DAO a query-handle (like the result of CRM_Core_DAO::executeQuery)
  19    */
  20   public function findReferences($targetDao) {
  21     $refColumn = $this->getReferenceKey();
  22     $targetColumn = $this->getTargetKey();
  23
  24     $params = array(
  25       1 => array($targetDao->$targetColumn, 'String'),
  26
  27       // If anyone complains about $targetDao::getTableName(), then could use
  28       // "{get_class($targetDao)}::getTableName();"
  29       2 => array($targetDao::getTableName(), 'String'),
  30     );
  31
  32     $sql = <<<EOS
  33 SELECT id
  34 FROM {$this->getReferenceTable()}
  35 WHERE {$refColumn} = %1
  36 AND {$this->getTypeColumn()} = %2
  37 EOS;
  38
  39     $daoName = CRM_Core_DAO_AllCoreTables::getClassForTable($this->getReferenceTable());
  40     $result = CRM_Core_DAO::executeQuery($sql, $params, TRUE, $daoName);
  41     return $result;
  42   }
  43 }