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 (convert-to-db-default-case "_CLSQL_SEQ_" database)
26 (sql-escape sequence-name)))
28 (defun %table-name-to-sequence-name (table-name database)
29 (and (>= (length table-name) 11)
30 (string-equal (subseq table-name 0 11)
31 (convert-to-db-default-case "_CLSQL_SEQ_" database))
32 (subseq table-name 11)))
34 (defmethod database-create-sequence (sequence-name database)
35 (let ((table-name (%sequence-name-to-table sequence-name database)))
36 (database-execute-command
37 (concatenate 'string "CREATE TABLE " table-name
38 " (last_value int NOT NULL PRIMARY KEY, increment_by int, min_value int, is_called char(1))")
40 (database-execute-command
41 (concatenate 'string "INSERT INTO " table-name
42 " VALUES (1,1,1,'f')")
45 (defmethod database-drop-sequence (sequence-name database)
46 (database-execute-command
47 (concatenate 'string "DROP TABLE " (%sequence-name-to-table sequence-name database))
50 (defmethod database-list-sequences (database &key (owner nil))
51 (declare (ignore owner))
53 (let ((sn (%table-name-to-sequence-name s database)))
55 (database-list-tables-and-sequences database)))
57 (defmethod database-set-sequence-position (sequence-name position database)
58 (database-execute-command
59 (format nil "UPDATE ~A SET last_value=~A,is_called='t'"
60 (%sequence-name-to-table sequence-name database)
65 (defmethod database-sequence-next (sequence-name database)
67 (let* ((table-name (%sequence-name-to-table sequence-name database))
70 (concatenate 'string "SELECT last_value,is_called FROM "
72 database :auto nil))))
74 ((char-equal (schar (second tuple) 0) #\f)
75 (database-execute-command
76 (format nil "UPDATE ~A SET is_called='t'" table-name)
80 (let ((new-pos (1+ (car tuple))))
81 (database-execute-command
82 (format nil "UPDATE ~A SET last_value=~D" table-name new-pos)
86 (defmethod database-sequence-last (sequence-name database)
89 (concatenate 'string "SELECT last_value FROM "
90 (%sequence-name-to-table sequence-name database))
91 database :auto nil))))