1 files changed, 72 insertions, 0 deletions
diff --git a/lib/db.php b/lib/db.php
index fba2687967f..de42626563d 100644
--- a/lib/db.php
+++ b/lib/db.php
@@ -542,6 +542,78 @@ class OC_DB {
 	}
 
 	/**
+	 * @brief Insert a row if a matching row doesn't exists.
+	 * @param string $table. The table to insert into in the form '*PREFIX*tableName'
+	 * @param array $input. An array of fieldname/value pairs
+	 * @returns The return value from PDOStatementWrapper->execute()
+	 */
+	public static function insertIfNotExist($table, $input) {
+		self::connect();
+		$prefix = OC_Config::getValue( "dbtableprefix", "oc_" );
+		$table = str_replace( '*PREFIX*', $prefix, $table );
+
+		if(is_null(self::$type)) {
+			self::$type=OC_Config::getValue( "dbtype", "sqlite" );
+		}
+		$type = self::$type;
+
+		$query = '';
+		// differences in escaping of table names ('`' for mysql) and getting the current timestamp
+		if( $type == 'sqlite' || $type == 'sqlite3' ) {
+			// NOTE: For SQLite we have to use this clumsy approach
+			// otherwise all fieldnames used must have a unique key.
+			$query = 'SELECT * FROM "' . $table . '" WHERE ';
+			foreach($input as $key => $value) {
+				$query .= $key . " = '" . $value . '\' AND ';
+			}
+			$query = substr($query, 0, strlen($query) - 5);
+			try {
+				$stmt = self::prepare($query);
+				$result = $stmt->execute();
+			} catch(PDOException $e) {
+				$entry = 'DB Error: "'.$e->getMessage() . '"<br />';
+				$entry .= 'Offending command was: ' . $query . '<br />';
+				OC_Log::write('core', $entry, OC_Log::FATAL);
+				error_log('DB error: '.$entry);
+				die( $entry );
+			}
+			
+			if($result->numRows() == 0) {
+				$query = 'INSERT INTO "' . $table . '" ("'
+					. implode('","', array_keys($input)) . '") VALUES("'
+					. implode('","', array_values($input)) . '")';
+			} else {
+				return true;
+			}
+		} elseif( $type == 'pgsql' || $type == 'oci' || $type == 'mysql') {
+			$query = 'INSERT INTO `' .$table . '` ('
+				. implode(',', array_keys($input)) . ') SELECT \''
+				. implode('\',\'', array_values($input)) . '\' FROM ' . $table . ' WHERE ';
+
+			foreach($input as $key => $value) {
+				$query .= $key . " = '" . $value . '\' AND ';
+			}
+			$query = substr($query, 0, strlen($query) - 5);
+			$query .= ' HAVING COUNT(*) = 0';
+		}
+
+		// TODO: oci should be use " (quote) instead of ` (backtick).
+		//OC_Log::write('core', __METHOD__ . ', type: ' . $type . ', query: ' . $query, OC_Log::DEBUG);
+
+		try {
+			$result = self::prepare($query);
+		} catch(PDOException $e) {
+			$entry = 'DB Error: "'.$e->getMessage() . '"<br />';
+			$entry .= 'Offending command was: ' . $query.'<br />';
+			OC_Log::write('core', $entry, OC_Log::FATAL);
+			error_log('DB error: ' . $entry);
+			die( $entry );
+		}
+
+		return $result->execute();
+	}
+	
+	/**
 	 * @brief does minor changes to query
 	 * @param string $query Query string
 	 * @return string corrected query string