code: @Override
  	public void accept(final TransformContext transformContext) {
  		Object value = eval(transformContext);
  
  		if (value != null) {
  			if (wrap) {
  				transformContext.addSqlPart("'").addSqlPart(escapeSql(value)).addSqlPart("'/*#").addSqlPart(expression)
  						.addSqlPart("*/");
  			} else {
  				transformContext.addSqlPart(escapeSql(value)).addSqlPart("/*$").addSqlPart(expression).addSqlPart("*/");
  			}
  		} else {
  			transformContext.addSqlPart(null);
  		}
  		pass();
  	}
docs: {@inheritDoc}
  
  @see jp.co.future.uroborosql.node.Node#accept(jp.co.future.uroborosql.parser.TransformContext)