Hi Guys..
like that it works, but just if i dobleclick my combobox
Qt Code: 
  1. #include "test.h"
  2.  
  3. #include <QMessageBox>
  4. #include <QSqlDatabase>
  5. #include <QSqlQuery>
  6. #include <QSqlError>
  7. #include <QTextEdit>
  8. #include <QStatusBar>
  9. #include <QAbstractItemView>
  10. #include <QEvent>
  11.  
  12.  
  13.  
  14.  
  15. MainWindow::MainWindow()
  16.  
  17.     {
  18.         ui.setupUi(this);
  19.         ui.sprache_cb->installEventFilter(this);
  20.  
  21.  
  22.         connect(ui.actionverbinden, SIGNAL(triggered()), this, SLOT(verbinden()));
  23.  
  24.  
  25.     }
  26.  
  27. bool MainWindow::verbinden()
  28. {
  29. 	 	QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
  30.         db.setHostName("pcpsr5");
  31.         db.setDatabaseName("DRIVER={SQL Server};SERVER=pcpsr5;DATABASE=inventar;UID=sa;PWD=");
  32.         db.setUserName("sa");
  33.         db.setPassword("");
  34.         if(!db.open())
  35.         {
  36.     	QMessageBox::information(this,"",db.lastError().text());
  37.         return false;
  38.     	}    
  39.         else
  40.         return true;
  41. }
  42. void MainWindow::selectSprache()
  43. {
  44. 	ui.sprache_cb->clear(); 
  45. 	ui.sprache_cb->insertItem(0,""); 
  46. 	QSqlQuery select (" select sprache from sprache_tbl");
  47. 	while(select.next())
  48. 	{
  49. 		QString sprachen = select.value(0).toString();
  50. 		ui.sprache_cb->insertItem(1, sprachen);
  51. 	}
  52.  
  53. }
  54.  
  55. bool MainWindow::eventFilter( QObject *o, QEvent *e )    
  56. {        
  57. 	if ( e->type() == QEvent::MouseButtonPress )         
  58. 	{            
  59. 		selectSprache();            
  60. 		return TRUE;       
  61. 	} 
  62. 	else         
  63. 		return FALSE;        
  64.  
  65. }
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