Status: Max Semester

application/models/organisation/Lehrverband_model.php

@@ -53,4 +53,34 @@ class Lehrverband_model extends DB_Model
 			return success("1","Lehrverband vorhanden!");
 		}
 	}
+
+	/**
+	 * Gets the maximum possible semester for one or more Studiengaenge.
+	 * If there are more than one Studiengang each maximum is calculated and
+	 * the smallest result is returned.
+	 *
+	 * @param array					$studiengang_kzs
+	 *
+	 * @return stdClass
+	 */
+	public function getMaxSemester($studiengang_kzs)
+	{
+		$sqls = [];
+		foreach ($studiengang_kzs as $studiengang_kz) {
+			$this->addSelect('MAX(semester) AS maxsem');
+			$this->db->where('studiengang_kz', $studiengang_kz);
+			$sqls[] = $this->db->get_compiled_select($this->dbTable);
+		}
+		
+		$this->addSelect('MIN(a.maxsem) AS maxsem');
+		
+		$dbTable = $this->dbTable;
+		$this->dbTable = '(' . implode(' UNION ', $sqls) . ') AS a';
+		
+		$result = $this->load();
+		
+		$this->dbTable = $dbTable;
+
+		return $result;
+	}
 }