code: protected String generateRequestIdentity(boolean isSingleIndexEntry, final String entryName)
              throws StorageException {
          if (isSingleIndexEntry) {
              return String.format("'%s'", entryName.replace("'", "''"));
          }
  
          if (this.opType == TableOperationType.INSERT) {
              return Constants.EMPTY_STRING;
          }
          else {
              String pk = null;
              String rk = null;
  
              if (this.opType == TableOperationType.RETRIEVE) {
                  final QueryTableOperation qOp = (QueryTableOperation) this;
                  pk = qOp.getPartitionKey();
                  rk = qOp.getRowKey();
              }
              else {
                  pk = this.getEntity().getPartitionKey();
                  rk = this.getEntity().getRowKey();
              }
  
              return String.format("%s='%s',%s='%s'", 
                      TableConstants.PARTITION_KEY, pk.replace("'", "''"), 
                      TableConstants.ROW_KEY, rk.replace("'", "''"));
          }
      }
docs: Reserved for internal use. Generates the request identity, consisting of the specified entry name, or the
  PartitionKey and RowKey pair from the operation, to identify the operation target.
  
  @param isSingleIndexEntry
  Pass <code>true</code> to use the specified <code>entryName</code> parameter, or <code>false</code> to
  use PartitionKey and RowKey values from the operation as the request identity.
  @param entryName
  The entry name to use as the request identity if the <code>isSingleIndexEntry</code> parameter is
  <code>true</code>.
  @return
  A <code>String</code> which represents the formatted request identity string.
  @throws StorageException
  If a storage service error occurred.