1 ;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
2 ;;;; *************************************************************************
4 ;;;; Generic sequence implementation. Backends should use native sequences if
7 ;;;; This file is part of CLSQL.
9 ;;;; CLSQL users are granted the rights to distribute and use this software
10 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
11 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
12 ;;;; *************************************************************************
14 (in-package #:clsql-sys)
16 (defclass generic-database (database)
18 (:documentation "Encapsulate same behavior across backends."))
21 ;;; Sequence functions
23 (defun %sequence-name-to-table (sequence-name database)
25 (combine-database-identifiers
26 (list sequence-name 'CLSQL_SEQ)
29 (defmethod database-create-sequence (sequence-name database)
30 (let ((table-name (%sequence-name-to-table sequence-name database)))
31 (database-execute-command
32 (concatenate 'string "CREATE TABLE " table-name
33 " (last_value int NOT NULL PRIMARY KEY, increment_by int, min_value int, is_called char(1))")
35 (database-execute-command
36 (concatenate 'string "INSERT INTO " table-name
37 " VALUES (1,1,1,'f')")
40 (defmethod database-drop-sequence (sequence-name database)
41 (database-execute-command
42 (concatenate 'string "DROP TABLE " (%sequence-name-to-table sequence-name database))
45 (defun %table-name-to-sequence-name (table-name)
46 ;; if this was escaped it still should be,
47 ;; if it wasnt it still shouldnt-be
48 (check-type table-name string)
49 (replace-all table-name "_CLSQL_SEQ" ""))
51 (defmethod database-list-sequences (database &key (owner nil))
52 (declare (ignore owner))
54 (and (search "_CLSQL_SEQ" s :test #'string-equal)
55 (list (%table-name-to-sequence-name s))))
56 (database-list-tables-and-sequences database)))
58 (defmethod database-set-sequence-position (sequence-name position database)
59 (database-execute-command
60 (format nil "UPDATE ~A SET last_value=~A,is_called='t'"
61 (%sequence-name-to-table sequence-name database)
66 (defmethod database-sequence-next (sequence-name database)
68 (let* ((table-name (%sequence-name-to-table sequence-name database))
71 (concatenate 'string "SELECT last_value,is_called FROM "
73 database :auto nil))))
75 ((char-equal (schar (second tuple) 0) #\f)
76 (database-execute-command
77 (format nil "UPDATE ~A SET is_called='t'" table-name)
81 (let ((new-pos (1+ (car tuple))))
82 (database-execute-command
83 (format nil "UPDATE ~A SET last_value=~D" table-name new-pos)
87 (defmethod database-sequence-last (sequence-name database)
90 (concatenate 'string "SELECT last_value FROM "
91 (%sequence-name-to-table sequence-name database))
92 database :auto nil))))