- added issue resolution job and libraries for defining how to resolve issues

- added issue inserts (fehlerupdate.php), included them in checksystem
- added getAufenthaltsdauer method to Bisio_model.php
- Add column parameterFuerBehebung to system.tbl_issue

application/models/codex/Bisio_model.php

@@ -11,4 +11,37 @@ class Bisio_model extends DB_Model
 		$this->dbTable = 'bis.tbl_bisio';
 		$this->pk = 'bisio_id';
 	}
+
+	/**
+	 * Gets duration of stay in days by bisio_id.
+	 * @param int $bisio_id
+	 * @return object success with number of days or error
+	 */
+	public function getAufenthaltsdauer($bisio_id)
+	{
+		// get from and to date
+		$this->addSelect('von, bis');
+		$bisioRes = $this->load($bisio_id);
+
+		if (isError($bisioRes))
+			return $bisioRes;
+
+		if (hasData($bisioRes))
+		{
+			$bisioData = getData($bisioRes)[0];
+
+			$avon = $bisioData->von;
+			$abis = $bisioData->bis;
+
+			if (is_null($avon) || is_null($abis))
+				return success("Von or bis date not set");
+
+			$vonDate = new DateTime($avon);
+			$bisDate = new DateTime($abis);
+			$interval = $vonDate->diff($bisDate);
+			return success($interval->days);
+		}
+		else
+			return success("Bisio not found");
+	}
 }