12.3.1 Table get

($article 'get #:columns (columns ...)
               #:functions '() ; put SQL functions here, e.g, '((count Article.name))
               #:ret 'all ; values: top | all | postive-number
               #:group-by '(column-name ...)
               #:order-by '(column-name ... asc) ;; or '(column-name ... desc)
               #:condition "" ; (where #:name "nala")
               #:foreach '() ; #:foreach '(city ("sz" "bj" "sh"))
               #:dump #f ; set #t if you want to check the SQL string
               #:mode 'raw ; raw to return all rows; getter to return a getter function)