SQL ERROR java.lang.ArrayIndexOutOfBoundsException: 0

Question

private void jselectedhousecomboPopupMenuWillBecomeInvisible(javax.swing.event.PopupMenuEvent evt) {                 

    String tmp = (String)jselectedhousecombo.getSelectedItem(); 
    String sql = "SELECT H.HOUSE, H.TOTALROOMS, H.BEDSPERROOM, H.ROOMSOCCUPIED, 
         H.ROOMSAVAILABLE, HM.HM_ID, HM.HM_NAME, HM.HM_DEPARTMENT, 
         HM.HOUSE, HM.HM_PHONENUMBER, HM.HM_DATEIN, HM.HM_DATEOUT, 
         HM.HM_RESIDENCE, CA.C_ID, CA.C_NAME, CA.HOUSE, CA.C_PHONENUMBER, 
         CA.C_DATEIN, CA.C_DATEOUT, CA.C_RESIDENCE, HP.HP_REGNO,HP.HP_NAME, HP.HP_FORM, 
         HP.HOUSE,HP.HP_ROOMNO,HP.HP_DATE, HP.HP_DATEOUT  
        FROM HOUSES H  
        JOIN Housemaster HM 
        ON H.HOUSE = HM.HOUSE JOIN Caretaker CA 
        ON H.HOUSE = CA.HOUSE JOIN Houseprefect HP 
        ON H.HOUSE = HP.HOUSE"; 

      try 
      { 

       pst=conn.prepareStatement(sql); 

       pst.setString(1, tmp); 

       rs=pst.executeQuery(); 

      if(rs.next()) 
      { 

       String add=rs.getString("HOUSE"); 
       jselectedhousename.setText(add); 

       String add2=rs.getString("C_NAME"); 
       jselectedhousecaretaker.setText(add2); 

       String add3=rs.getString("HM_NAME"); 
       jselectedhousemaster.setText(add3); 

       String add4=rs.getString("HP_NAME"); 
       jselectedhouseprefect.setText(add4); 

       String add5=rs.getString("TOTALROOMS"); 
       jselectedhousetr.setText(add5); 

       String add6=rs.getString("BEDSPERROOM"); 
       jselectedhousebpr.setText(add6); 

       String add7=rs.getString("ROOMSOCCUPIED"); 
       jselectedhousero.setText(add7); 

       String add8=rs.getString("ROOMSAVAILABLE"); 
       jselectedhousera.setText(add8); 

       String add9=rs.getString("HM_ID"); 
       jselectedhmid.setText(add9); 

       String add10=rs.getString("HM_NAME"); 
       jselectedhmname.setText(add10); 

       String add11=rs.getString("HM_DEPARTMENT"); 
       jselectedhmdept.setText(add11); 

       String add12=rs.getString("HOUSE"); 
       jselectedhmhouse.setText(add12); 

       String add13=rs.getString("HM_PHONENUMBER"); 
       jselectedhmphone.setText(add13); 

       String add14=rs.getString("HM_DATEIN"); 
       jselectedhmdatein.setText(add14); 

       String add15=rs.getString("HM_DATEOUT"); 
       jselectedhmdateout.setText(add15); 

       String add16=rs.getString("HM_RESIDENCE"); 
       jselectedhmresidence.setText(add16); 

       String add17=rs.getString("HP_REGNO"); 
       jselectedhpregno.setText(add17); 

       String add18=rs.getString("HP_NAME"); 
       jselectedhpname.setText(add18); 

       String add19=rs.getString("HP_FORM"); 
       jselectedhpform.setText(add19); 

       String add20=rs.getString("HOUSE"); 
       jselectedhphouse.setText(add20); 

       String add21=rs.getString("HP_ROOMNO"); 
       jselectedhproom.setText(add21); 

       String add22=rs.getString("HP_DATEIN"); 
       jselectedhpdatein.setText(add22); 

       String add23=rs.getString("HP_DATEOUT"); 
       jselectedhpdateout.setText(add23); 

       String add24=rs.getString("C_ID"); 
       jselectedcid.setText(add24); 

       String add25=rs.getString("C_NAME"); 
       jselectedcnames.setText(add25); 

       String add26=rs.getString("HOUSE"); 
       jselectedchouse.setText(add26); 

       String add27=rs.getString("C_PHONENUMBER"); 
       jselectedcphone.setText(add27); 

       String add28=rs.getString("C_DATEIN"); 
       jselectedcdatein.setText(add28); 

       String add29=rs.getString("C_DATEOUT"); 
       jselectedcdateout.setText(add29); 

       String add30=rs.getString("C_RESIDENCE"); 
       jselectedcresidence.setText(add30); 


      } 
    } catch (Exception e) 
    { 
     System.out.println(e); 
     e.printStackTrace(); 
     JOptionPane.showMessageDialog(null, e); 
    } 
      finally 
    { 
     try { 
      rs.close(); 
      pst.close(); 
     } catch (Exception e) { 
     } 
    } 

    // TODO add your handling code here: 
} 

Answer 1

Sie versuchen, zu viele Zeilen in Ihren SELECT Anweisungen zurückzugeben. Wenn Sie eine SELECT Anweisung in einer SELECT Anweisung haben, kann sie nur eine Zeile zurückgeben.

Sie müssen mehrere Tabellen zusammenfügen. Ich weiß nicht, die genaue Schema Ihrer Tabellen, aber wenn ich eine Vermutung nehmen hätte, würde ich sagen, das ist, was Sie nach:

SELECT H.HOUSE,H.TOTALROOMS,H.BEDSPERROOM,H.ROOMSOCCUPIED,H.ROOMSAVAILABLE, 
     HM.ID,HM.NAME,HM.DEPARTMENT,HM.HOUSE,HM.PHONENUMBER,HM.DATEIN,HM.DATEOUT,HM.RESIDENCE, 
     CA.ID,CA.NAME,CA.HOUSE,CA.PHONENUMBER,CA.DATEIN,CA.DATEOUT,CA.RESIDENCE, 
     HP.REGNO,HP.NAME,HP.FORM,HP.HOUSE,HP.ROOMNO,HP.DATEIN,HP.DATEOUT 
FROM HOUSES H JOIN HOUSEMASTER HM ON H.HOUSE = HM.ROWID 
       JOIN CARETAKER CA ON H.HOUSE = CA.ROWID 
       JOIN HOUSEPERFECT HP ON H.HOUSE = HP.ROWID; 

lesen this guide auf SQL-Anweisungen für weitere Informationen JOIN.