code: void appendSql(String tableName, StringBuilder sb, List<ArgumentHolder> columnArgList) throws SQLException {
  		if (clauseStackLevel == 0) {
  			throw new IllegalStateException("No where clauses defined.  Did you miss a where operation?");
  		}
  		if (clauseStackLevel != 1) {
  			throw new IllegalStateException(
  					"Both the \"left-hand\" and \"right-hand\" clauses have been defined.  Did you miss an AND or OR?");
  		}
  		if (needsFuture != null) {
  			throw new IllegalStateException(
  					"The SQL statement has not been finished since there are previous operations still waiting for clauses.");
  		}
  
  		// we don't pop here because we may want to run the query multiple times
  		peek().appendSql(databaseType, tableName, sb, columnArgList);
  	}
docs: Used by the internal classes to add the where SQL to the {@link StringBuilder}.
  
  @param tableName
  Name of the table to prepend to any column names or null to be ignored.