*
* @author Roland Haeder <webmaster@ship-simu.org>
* @version 0.0.0
- * @copyright Copyright(c) 2007, 2008 Roland Haeder, this is free software
+ * @copyright Copyright (c) 2007, 2008 Roland Haeder, this is free software
* @license GNU GPL 3.0 or any newer version
* @link http://www.ship-simu.org
*
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
class BaseDatabaseWrapper extends BaseFrameworkSystem {
+ /**
+ * Cache instance
+ */
+ private $cacheInstance = null;
+
+ /**
+ * Current table name to use
+ */
+ private $tableName = "unknown";
+
/**
* Protected constructor
*
// Call parent constructor
parent::__construct($class);
+ // Initialize the cache instance
+ $this->initCacheInstance();
+
// Clean up a little
$this->removeNumberFormaters();
$this->removeSystemArray();
}
+
+ /**
+ * Initializes the cache instance with a new object
+ *
+ * @return void
+ */
+ private final function initCacheInstance () {
+ // Set the new instance
+ $this->cacheInstance = CacheFactory::getFactory()->createConfiguredCache();
+ }
+
+ /**
+ * Do a "select" query on the current table with the given search criteria and
+ * store it in cache for later usage
+ *
+ * @param $criteriaInstance An instance of a Criteria class
+ * @return $resultInstance An instance of a database result class
+ */
+ public function doSelectByCriteria (Criteria $criteriaInstance) {
+ // First get a key suitable for our cache and extend it with this class name
+ $cacheKey = sprintf("%s@%s",
+ $this->__toString(),
+ $criteriaInstance->getCacheKey()
+ );
+
+ // Does this key exists in cache?
+ if ($this->cacheInstance->offsetExists($cacheKey)) {
+ // Then use this result
+ $result = $cacheInstance->offsetGet($cacheKey);
+ } else {
+ // Now it's time to ask the database layer for this select statement
+ $result = $this->getDatabaseInstance()->doSelectByTableCriteria($this->getTableName(), $criteriaInstance);
+
+ // Cache the result if not null
+ if (!is_null($result)) {
+ // A valid result has returned from the database layer
+ $this->cacheInstance->offsetSet($cacheKey, $result);
+ } else {
+ // This invalid result must be wrapped
+ $result = array(
+ 'status' => "invalid",
+ 'exception' => $this->getDatabaseInstance()->getLastException()
+ );
+ }
+ }
+
+ // Create an instance of a DatabaseResult class with the given result
+ $resultInstance = DatabaseResult::createDatabaseResult($result);
+
+ // And return the instance
+ return $resultInstance;
+ }
+
+ /**
+ * Count the numbers of rows we shall receive
+ *
+ * @param $criteriaInstance An instance of a Criteria class
+ * @return $numRows Numbers of rows of database entries
+ */
+ public function doSelectCountByCriteria (Criteria $criteriaInstance) {
+ // Total numbers is zero by default
+ $numRows = 0;
+
+ // Get the result from above method
+ $resultInstance = $this->doSelectByCriteria($criteriaInstance);
+
+ // Was that query fine?
+ if ($resultInstance->ifStatusIsOkay()) {
+ // Then get the number of rows
+ $numRows = $resultInstance->getAffectedRows();
+ } // END - if
+
+ // Return the result
+ return $numRows;
+ }
+
+ /**
+ * Setter for table name
+ *
+ * @param $tableName Name of table name to set
+ * @return void
+ */
+ protected final function setTableName ($tableName) {
+ $this->tableName = (string) $tableName;
+ }
+
+ /**
+ * Getter for table name
+ *
+ * @return $tableName Name of table name to set
+ */
+ protected final function getTableName () {
+ return $this->tableName;
+ }
+
+ /**
+ * Getter for primary key used in wrapped table
+ *
+ * @return $primaryKey Primary key used in wrapped table
+ */
+ public final function getPrimaryKeyValue () {
+ // Get the table name and a database instance and ask for it
+ $primaryKey = $this->getDatabaseInstance()->getPrimaryKeyOfTable($this->getTableName());
+
+ // Return value
+ return $primaryKey;
+ }
}
// [EOF]