Doblar comillas simples (escapar para Oracle y Sybase)

public static String mySimpleQuote (String pCadena){
 
		if (pCadena==null) {
			return "";
		}
		String sCadena = ""; // Cadena procesada
		int nCount  = 0;
 
		try	{
			// Tokenizamos la cadena
			StringTokenizer tok = new StringTokenizer (pCadena, "'");
 
			while (tok.hasMoreTokens()){
				sCadena = sCadena + tok.nextToken () + "''";
			}
 
			sCadena = sCadena.substring(0, sCadena.length() - 2);
			return sCadena;
		}
		catch (Exception e){
			return "";
		}
	}