1 ;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
2 ;;;; *************************************************************************
6 ;;;; Generic sequence implementation. Backends should use native sequences if
9 ;;;; This file is part of CLSQL.
11 ;;;; CLSQL users are granted the rights to distribute and use this software
12 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
13 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
14 ;;;; *************************************************************************
16 (in-package #:clsql-sys)
18 (defclass generic-database (database)
20 (:documentation "Encapsulate same behavior across backends."))
23 ;;; Sequence functions
25 (defun %sequence-name-to-table (sequence-name database)
27 (convert-to-db-default-case "_CLSQL_SEQ_" database)
28 (sql-escape sequence-name)))
30 (defun %table-name-to-sequence-name (table-name database)
31 (and (>= (length table-name) 11)
32 (string-equal (subseq table-name 0 11)
33 (convert-to-db-default-case "_CLSQL_SEQ_" database))
34 (subseq table-name 11)))
36 (defmethod database-create-sequence (sequence-name database)
37 (let ((table-name (%sequence-name-to-table sequence-name database)))
38 (database-execute-command
39 (concatenate 'string "CREATE TABLE " table-name
40 " (last_value int NOT NULL PRIMARY KEY, increment_by int, min_value int, is_called char(1))")
42 (database-execute-command
43 (concatenate 'string "INSERT INTO " table-name
44 " VALUES (1,1,1,'f')")
47 (defmethod database-drop-sequence (sequence-name database)
48 (database-execute-command
49 (concatenate 'string "DROP TABLE " (%sequence-name-to-table sequence-name database))
52 (defmethod database-list-sequences (database &key (owner nil))
53 (declare (ignore owner))
55 (let ((sn (%table-name-to-sequence-name s database)))
57 (database-list-tables-and-sequences database)))
59 (defmethod database-set-sequence-position (sequence-name (position integer) database)
60 (database-execute-command
61 (format nil "UPDATE ~A SET last_value=~A,is_called='t'"
62 (%sequence-name-to-table sequence-name database)
67 (defmethod database-sequence-next (sequence-name database)
69 (let* ((table-name (%sequence-name-to-table sequence-name database))
72 (concatenate 'string "SELECT last_value,is_called FROM "
74 database :auto nil))))
76 ((char-equal (schar (second tuple) 0) #\f)
77 (database-execute-command
78 (format nil "UPDATE ~A SET is_called='t'" table-name)
82 (let ((new-pos (1+ (car tuple))))
83 (database-execute-command
84 (format nil "UPDATE ~A SET last_value=~D" table-name new-pos)
88 (defmethod database-sequence-last (sequence-name database)
91 (concatenate 'string "SELECT last_value FROM "
92 (%sequence-name-to-table sequence-name database))
93 database :auto nil))))