oracle - JAVA SQL command not properly ended -


i have code:

buy.addactionlistener(new actionlistener() {     @override     public void actionperformed(actionevent actionevent)     {         int r;         r = table.getselectedrow();         string num = (string) table.getvalueat(r, 0);//numele jucariei         //string cop = (string) table.getvalueat(r, 3);//nr de bucati          try         {             pq = stmt.executequery("select *" + "from buyid_view");             xv = stmt.executequery("select toyid, copies " + "from alldatas_view" + "where toyname ='"+num+"'");             int buyid = pq.getint("buyid");             int toyid = xv.getint("toyid");             int copies = xv.getint("copies");             copies = copies-1;             callablestatement cstmt = con.preparecall("insert buy (buyid, toyid)" + "values (?,?)");             cstmt.setint("buyid", buyid);             cstmt.setint("toyid", toyid);             resultset rs = cstmt.executequery();             joptionpane.showmessagedialog(null, "you brought toy.");              for(int = 0; < table.getrowcount(); i++)                 for(int j = 0; j < table.getcolumncount(); j++)                     table.setvalueat("", i, j);              try             {                 rs = stmt.executequery("update toys set copies "+ copies +"where toyid= '"+toyid+"'");             }             catch (sqlexception e)             {                 joptionpane.showmessagedialog(null, e.getmessage());             }              int = 0;              try             {                 rs = stmt.executequery("select *"+                         "from availablebooks_view");             }             catch (sqlexception e)             {                 e.printstacktrace();             }                         {                 try {                     if(rs.next())                     {                         table.setvalueat(rs.getstring(1), i, 0);                         table.setvalueat(rs.getstring(2), i, 1);                         table.setvalueat(rs.getstring(3), i, 2);                         i++;                         while(rs.next())                         {                             table.setvalueat(rs.getstring(1), i, 0);                             table.setvalueat(rs.getstring(2), i, 1);                             table.setvalueat(rs.getstring(3), i, 2);                             i++;                         }                     }                 } catch (sqlexception e) {                     joptionpane.showmessagedialog(null, e.getmessage());                 }             }         }         catch (sqlexception e)         {             if(e.getmessage().contains("you have pay!"))                 warning(frame, "you didn't pay products");             else                 warning(frame, e.getmessage());         }     } });

when compile program don't have error when run , click on buy button gives me error saying "ora-00933: sql command not ended".

when building sql statements strings must ensure there spaces spaces needed. 

rs = stmt.executequery("select *"+      "from availablebooks_view");

the statement sending 

select *from availablebooks_view

which invalid syntax. have problem in several places in code.

however, have larger issue results building sql statements piecemeal. leaves open sql injection , should rewrite code use prepared statements , parameters instead.


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