Enabled caching table_columns() and results

classes/Kohana/Database/DB2.php

@@ -75,6 +75,10 @@ class Kohana_Database_DB2 extends Database {
 				$e->getCode());
 		}
 
+		if (! $this->_connection) {
+			throw new Database_Exception('Connection to DB2 failed? (:error)', array(':error'=>db2_conn_errormsg()));
+		}
+
 		// \xFF is a better delimiter, but the PHP driver uses underscore
 		$this->_connection_id = sha1($hostname.'_'.$username.'_'.$password);
 
@@ -152,6 +156,17 @@ class Kohana_Database_DB2 extends Database {
 	}
 
 	public function list_columns($table, $like = NULL, $add_prefix = FALSE) {
+		// If caching is on, cache the tables
+		if ($this->_config['caching']) {
+			$cache_key = __METHOD__.':'.$table.':'.$like.':'.$add_prefix;
+
+			$columns = Kohana::cache($cache_key);
+
+			if ($columns) {
+				return $columns;
+			}
+		}
+
 		// Make sure the database is connected
 		$this->_connection or $this->connect();
 
@@ -166,7 +181,12 @@ class Kohana_Database_DB2 extends Database {
 		else
 		{
 			// Find all column names
+			try {
 				$result = db2_columns($this->_connection,NULL,'%',$table);
+
+			} catch (Exception $e) {
+				throw new Kohana_Exception('Unable to show DB Columns :table (:connection)',array(':table'=>$table,':connection'=>$this->_connection));
+			}
 		}
 
 		$count = 0;
@@ -224,6 +244,11 @@ class Kohana_Database_DB2 extends Database {
 			$columns[$row['COLUMN_NAME']] = $column;
 		}
 
+		// Save our cache data for next call
+		if ($this->_config['caching']) {
+			Kohana::cache($cache_key,$columns);
+		}
+
 		return $columns;
 	}
 

classes/Kohana/Database/DB2/Result.php

@@ -12,6 +12,9 @@ class Kohana_Database_DB2_Result extends Database_Result {
 
 	protected $_internal_row = 0;
 
+	// if we cache queries, we need to preserve our data, otherwise it is lost
+	protected $_internal_data = array();
+
 	public function __construct($result, $sql, $as_object = FALSE, array $params = NULL)
 	{
 		parent::__construct($result, $sql, $as_object, $params);
@@ -39,7 +42,7 @@ class Kohana_Database_DB2_Result extends Database_Result {
 		}
 		else
 		{
-			return FALSE;
+			return isset($this->_internal_data[$offset+1]);
 		}
 	}
 
@@ -53,11 +56,13 @@ class Kohana_Database_DB2_Result extends Database_Result {
 
 		if ($this->_as_object === TRUE)
 		{
+			throw new Kohana_Exception('This configuration is not tested for caching');
 			// Return an stdClass
 			return db2_fetch_object($this->_result);
 		}
 		elseif (is_string($this->_as_object))
 		{
+			throw new Kohana_Exception('This configuration is not tested for caching');
 			$o = new $this->_as_object;
 
 			// Return an object of given class name
@@ -67,8 +72,15 @@ class Kohana_Database_DB2_Result extends Database_Result {
 		else
 		{
 			// Return an array of the row
-			return db2_fetch_assoc($this->_result);
+			return isset($this->_internal_data[$this->_internal_row])
+				? $this->_internal_data[$this->_internal_row]
+				: ($this->_internal_data[$this->_internal_row] = db2_fetch_assoc($this->_result));
 		}
 	}
 
-} // End Database_DB2L_Result
+	public function rewind() {
+		$this->_internal_row = 0;
+
+		return parent::rewind();
+	}
+} // End Database_DB2_Result