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Christian Paminger
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<?php
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/**
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* Eine Einheit fasst mehrere Studenten zusammen. Die Besonderheit ist,
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* dass die Studenten aus unterschiedlichen Studiengaengen stammen koennen.
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* Das wird z.B. für die Freifaecher benoetigt.
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* @author Christian Paminger, Werner Masik (werner@gefi.at)
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* @version 1.0
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* @created 22-Okt-2004 11:50:18
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* @updated 28.10.2004 (WM)
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*/
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class einheit
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{
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/**
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* @var string
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*/
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var $kurzbz;
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/**
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* @var integer
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*/
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var $stg_kz;
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/**
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* @var string nur zur info beim Suchergebnis, wird nicht gespeichert
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*/
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var $stg_kurzbz;
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/**
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* @var string
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*/
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var $bezeichnung;
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/**
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* @var integer
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*/
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var $semester;
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/**
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* @var integer
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*/
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var $typ;
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/**
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* @var string
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*/
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var $mailgrp_kurzbz;
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/**
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* @var string
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*/
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var $errormsg;
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/**
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* @var DB-Resource
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*/
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var $conn;
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function einheit($conn,$kurzbz='')
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{
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$this->conn = $conn;
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if (strlen($kurzbz)>0)
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{
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$this->kurzbz=$kurzbz;
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$this->load();
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}
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}
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/**
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* Speichert die Einheit in der Datenbank. Bei Fehler ist der Rueckgabewert
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* 'false' und die Fehlermeldung steht in 'errormsg'. INSERT oder DELETE wird
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* durch 'new' bestimmt.
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* @param string $kurzbz_new Kurzbezeichnung ist optional
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* @return boolean true=ok, false=fehler
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*/
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function save($kurzbz_new='')
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{
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if (is_null($this->conn))
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{
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return false;
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}
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if (strlen($this->kurzbz)==0)
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{
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$this->errormsg="<i>kurzbz</i> nicht gesetzt";
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return false;
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}
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if ($this->new)
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{
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if (is_numeric($this->semester)) $semester=$this->semester;
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else $semester='NULL';
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if (is_numeric($this->typ)) $typ=$this->typ;
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else $typ='NULL';
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if(!strlen($this->mailgrp_kurzbz)>0)
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$this->mailgrp_kurzbz='NULL';
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$qry="insert into tbl_einheit(einheit_kurzbz,studiengang_kz,bezeichnung,semester,typ,mailgrp_kurzbz) ".
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"values('".$this->kurzbz."','".$this->stg_kz."','".$this->bezeichnung."',$semester,$typ,$this->mailgrp_kurzbz)";
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} else
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{
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if (is_numeric($this->semester)) $semester='semester='.$this->semester;
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else $semester='semester=NULL';
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if (is_numeric($this->typ)) $typ='typ='.$this->typ;
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else $typ='NULL';
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if(!strlen($this->mailgrp_kurzbz)>0)
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$this->mailgrp_kurzbz='mailgrp_kurzbz=NULL';
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else
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$this->mailgrp_kurzbz="mailgrp_kurzbz='$this->mailgrp_kurzbz'";
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$qry="update tbl_einheit set studiengang_kz=".$this->stg_kz.",bezeichnung='".$this->bezeichnung."',".
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"$semester,$typ,".$this->mailgrp_kurzbz.",einheit_kurzbz='".(strlen($kurzbz_new)>0?$kurzbz_new:$this->kurzbz)."' ".
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"where einheit_kurzbz='".$this->kurzbz."'";
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}
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//echo $qry;
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if(!($erg=pg_exec($this->conn, $qry)))
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{
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$this->errormsg=pg_errormessage($this->conn);
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return false;
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}
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return true;
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}
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/**
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* @return boolean true=ok, false=fehler
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*/
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function load($kurzbz='')
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{
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// optional: kurzbz setzen
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if (strlen($uid)>0)
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$this->kurzbz=$kurzbz;
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// uid vorhanden?
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if (strlen($this->kurzbz)==0) {
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$this->errormsg='<i>einheit_kurzbz</i> nicht gesetzt';
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return false;
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}
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if (is_null($this->conn)) {
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return false;
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}
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$qry="select einheit_kurzbz,studiengang_kz,bezeichnung,semester,typ, mailgrp_kurzbz ".
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"from tbl_einheit ".
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"where einheit_kurzbz='".$this->kurzbz."'";
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if(!($erg=pg_exec($this->conn, $qry))) {
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$this->errormsg=pg_errormessage($this->conn);
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return false;
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}
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$num_rows=pg_numrows($erg);
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if($num_rows!=1) {
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$this->errormsg="Zuwenige oder zuviele Ergebnisse (Anzahl: $num_rows)!";
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return false;
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}
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$row=pg_fetch_object($erg,0);
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$this->stg_kz=$row->studiengang_kz;
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$this->bezeichnung=$row->bezeichnung;
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$this->semester=$row->semester;
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$this->typ=$row->typ;
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$this->mailgrp_kurzbz=$row->mailgrp_kurzbz;
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return true;
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}
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/**
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* Loescht die Funktion aus der Datenbank. Bei Fehler ist der Rueckgabewert
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* 'false' und die Fehlermeldung steht in 'errormsg'.
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* @return boolean true=ok, false=fehler
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*/
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function delete()
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{
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if (is_null($this->conn)) {
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return false;
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}
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$qry="delete from tbl_einheit where einheit_kurzbz='".$this->kurzbz."'";
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if(!($erg=pg_exec($this->conn, $qry))) {
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$this->errormsg=pg_errormessage($this->conn);
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return false;
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}
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return true;
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}
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function addStudent($uid) {
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if (is_null($this->conn)) {
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return false;
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}
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$qry="insert into tbl_einheitstudent(einheit_kurzbz,uid,updateamum,updatevon) ".
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"values('".$this->kurzbz."','".$uid."',now(),'".$_SERVER['PHP_AUTH_USER']."')";
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if(!($erg=pg_exec($this->conn, $qry))) {
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$this->errormsg=pg_errormessage($this->conn);
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return false;
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}
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return true;
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}
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function deleteStudent($uid) {
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if (is_null($this->conn)) {
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return false;
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}
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$qry="delete from tbl_einheitstudent ".
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"where einheit_kurzbz='".$this->kurzbz."' and uid='$uid'";
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if(!($erg=pg_exec($this->conn, $qry))) {
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$this->errormsg=pg_errormessage($this->conn);
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return false;
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}
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return true;
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}
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/**
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* Alle Einheiten zurueckgeben
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* @return array Array der einheiten
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*/
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function getAll($studiengang_kz='')
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{
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if (is_null($this->conn)) {
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return false;
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}
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if (strlen($studiengang_kz)>0)
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{
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$where=" where tbl_einheit.studiengang_kz='".$studiengang_kz."' ";
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} else
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{
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$where="";
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}
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$qry="select tbl_einheit.*,tbl_studiengang.kurzbz from tbl_einheit join tbl_studiengang using(studiengang_kz) ".
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"$where order by einheit_kurzbz;";
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if(!($erg=pg_exec($this->conn, $qry))) {
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$this->errormsg=pg_errormessage($this->conn);
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return false;
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}
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$num_rows=pg_numrows($erg);
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$result=array();
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for($i=0;$i<$num_rows;$i++)
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{
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$row=pg_fetch_object($erg,$i);
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$l=new einheit($this->conn);
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$l->kurzbz=$row->einheit_kurzbz;
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$l->stg_kz=$row->studiengang_kz;
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$l->stg_kurzbz=$row->kurzbz;
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$l->bezeichnung=$row->bezeichnung;
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$l->semester=$row->semester;
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$l->typ=$row->typ;
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$l->mailgrp_kurzbz=$row->mailgrp_kurzbz;
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$result[]=$l;
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}
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return $result;
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}
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/**
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* Liste aller Studenten zurueckgeben
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* @param string $studiengang_kz optional
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* @return array Array mit allen Studenten, false bei fehler
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*/
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function getStudenten($studiengang_kz='')
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{
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if (is_null($this->conn)) {
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return false;
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}
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if (strlen($studiengang_kz)>0)
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{
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$where=" and tbl_einheit.studiengang_kz='".$studiengang_kz."' ";
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} else
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{
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$where="";
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}
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$qry="select einheit_kurzbz,uid ".
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"from tbl_einheitstudent join tbl_student using(uid) join tbl_person using(uid) ".
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" join tbl_einheit using (einheit_kurzbz) ".
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"where einheit_kurzbz='".$this->kurzbz."' $where ".
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"order by upper(tbl_person.nachname),upper(tbl_person.vornamen)";
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if(!($erg=pg_exec($this->conn, $qry))) {
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$this->errormsg=pg_errormessage($this->conn);
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return false;
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}
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$num_rows=pg_numrows($erg);
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$result=array();
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for($i=0;$i<$num_rows;$i++)
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{
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$row=pg_fetch_object($erg,$i);
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$l=new student($this->conn,$row->uid);
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$result[]=$l;
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}
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return $result;
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}
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/**
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* Liefert die Anzahl der Studenten in einer Einheit
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* @param string kurzbzlang
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* @return anzahl der Studenten
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*/
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function countStudenten($einheit_kurzbz)
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{
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$qry = "Select count(*) as anzahl from tbl_einheitstudent where einheit_kurzbz='$einheit_kurzbz'";
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if($result=pg_query($this->conn,$qry))
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{
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if($row=pg_fetch_object($result))
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return $row->anzahl;
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else
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{
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$this->errormsg = pg_errormessage($this->conn);
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return false;
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}
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}
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else
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{
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$this->errormsg = pg_errormessage($this->conn);
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return false;
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}
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}
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}
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?>
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