check Bismeldestichtag, refactor Lehrverband

application/models/organisation/Lehrverband_model.php

@@ -11,4 +11,37 @@ class Lehrverband_model extends DB_Model
 		$this->dbTable = 'public.tbl_lehrverband';
 		$this->pk = array('gruppe', 'verband', 'semester', 'studiengang_kz');
 	}
+
+	/**
+	 * Check if Lehrverband already exists
+	 * @param string $student_id
+	 * @param string $studiensemester_kurzbz
+	 * @return 1: if Rolle exists, 0: if it doesn't
+	 */
+	public function checkIfLehrverbandExists($student_uid, $studiensemester_kurzbz)
+	{
+		$qry = "SELECT
+					*
+				FROM 
+				    public.tbl_studentlehrverband
+				WHERE
+					student_uid = ? 
+				AND
+				    studiensemester_kurzbz = ?";
+
+		$result = $this->execQuery($qry, array($student_uid, $studiensemester_kurzbz));
+
+		if (isError($result))
+		{
+			return error($result);
+		}
+		elseif (!hasData($result))
+		{
+			return success("0", "Kein Lehrverband vorhanden!");
+		}
+		else
+		{
+			return success("1","Lehrverband vorhanden!");
+		}
+	}
 }