1 ;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
2 ;;;; *************************************************************************
3 ;;;; FILE IDENTIFICATION
6 ;;;; Purpose: Mid-level (DBI) interface for CLSQL ODBC backend
7 ;;;; Author: Kevin M. Rosenberg
8 ;;;; Create: April 2004
10 ;;;; $Id: odbc-sql.lisp 8983 2004-04-12 21:16:48Z kevin $
12 ;;;; This file, part of CLSQL, is Copyright (c) 2002 by Kevin M. Rosenberg
14 ;;;; CLSQL users are granted the rights to distribute and use this software
15 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
16 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
17 ;;;; *************************************************************************
19 (in-package #:cl-user)
21 (defpackage #:odbc-dbi
33 #:list-all-data-sources
34 #:list-all-database-tables
35 #:list-all-table-columns
46 #:*default-odbc-external-format*
49 (:documentation "This is the mid-level interface ODBC."))
51 (in-package #:odbc-dbi)
53 (defgeneric terminate (src))
54 (defgeneric db-open-query (src query-expression
55 &key arglen col-positions result-types width
57 (defgeneric db-fetch-query-results (src &optional count))
58 (defgeneric %db-execute (src sql-expression &key &allow-other-keys))
59 (defgeneric db-execute-command (src sql-string))
61 (defgeneric %initialize-query (src arglen col-positions
62 &key result-types width))
64 (defgeneric %read-query-data (src ignore-columns))
65 (defgeneric db-map-query (src type function query-exp &key result-types))
66 (defgeneric db-prepare-statement (src sql &key parameter-table
68 (defgeneric get-odbc-info (src info-type))
74 (;; any reason to have more than one henv?
75 (width :initform +max-precision+ :accessor db-width)
76 (hstmt :initform nil :accessor db-hstmt)
77 (henv :initform nil :allocation :class :initarg :henv :accessor henv)
78 (hdbc :initform nil :initarg :hdbc :accessor hdbc)
79 ;; info returned from SQLGetInfo
80 (info :initform (make-hash-table) :reader db-info)
81 (type :initform nil :initarg :db-type :reader db-type)
82 (connected-p :initform nil :accessor db-connected-p)
84 (count :initform 0 :initarg :count :accessor db-count)
86 (total-count :initform 0 :allocation :class :accessor db-total-count)
87 ;; the use of this slot is deprecated; it will be removed when dtf works without it.
88 (query :initform nil :accessor db-query-object)
89 ;; resource of (active and inactive) query objects
90 (queries :initform () :accessor db-queries)))
92 (defclass odbc-query ()
93 ((hstmt :initform nil :initarg :hstmt :accessor hstmt) ; = cursor??
94 (width :initform +max-precision+ :accessor query-width)
95 (computed-result-types :initform nil :initarg :computed-result-types :accessor computed-result-types)
96 (column-count :initform nil :accessor column-count)
97 (column-names :initform (make-array 0 :element-type 'string :adjustable t :fill-pointer t)
98 :accessor column-names)
99 (column-c-types :initform (make-array 0 :element-type 'fixnum :adjustable t :fill-pointer t)
100 :accessor column-c-types)
101 (column-sql-types :initform (make-array 0 :element-type 'fixnum :adjustable t :fill-pointer t)
102 :accessor column-sql-types)
103 (column-data-ptrs :initform (make-array 0 :adjustable t :fill-pointer t)
105 (column-out-len-ptrs :initform (make-array 0 :adjustable t :fill-pointer t)
106 :accessor column-out-len-ptrs)
107 (column-precisions :initform (make-array 0 :element-type 'fixnum :adjustable t :fill-pointer t)
108 :accessor column-precisions)
109 (column-scales :initform (make-array 0 :element-type 'fixnum :adjustable t :fill-pointer t)
110 :accessor column-scales)
111 (column-nullables-p :initform (make-array 0 :element-type 'fixnum :adjustable t :fill-pointer t)
112 :accessor column-nullables-p)
113 ;;(parameter-count :initform 0 :accessor parameter-count)
114 (parameter-data-ptrs :initform (make-array 0 :adjustable t :fill-pointer t)
115 :accessor parameter-ptrs)
116 ;; a query string or a query expression object
117 (sql-expression :initform nil :initarg :sql-expression :accessor sql-expression)
118 ;; database object the query is to be run against
119 (database :initarg :database :reader query-database)
120 (active-p :initform nil :initarg :active-p :accessor query-active-p))
122 "Stores query information, like SQL query string/expression and database to run
123 the query against." ))
125 ;;; AODBC Compatible interface
127 (defun connect (&key data-source-name user password (autocommit t))
128 (let ((db (make-instance 'odbc-db)))
129 (unless (henv db) ;; has class allocation!
130 (setf (henv db) (%new-environment-handle)))
131 (setf (hdbc db) (%new-db-connection-handle (henv db)))
132 (%sql-connect (hdbc db) data-source-name user password)
133 #+ignore (setf (db-hstmt db) (%new-statement-handle (hdbc db)))
134 (when (/= (get-odbc-info db odbc::$SQL_TXN_CAPABLE) odbc::$SQL_TC_NONE)
136 (enable-autocommit (hdbc db))
137 (disable-autocommit (hdbc db))))
140 (defun disconnect (database)
141 (with-slots (hdbc queries) database
142 (dolist (query queries)
143 (if (query-active-p query)
144 (with-slots (hstmt) query
146 (%free-statement hstmt :drop)
148 (when (db-hstmt database)
149 (%free-statement (db-hstmt database) :drop))
153 (defun sql (expr &key db result-types row-count (column-names t) query
155 (declare (ignore hstmt))
158 (let ((q (db-open-query db expr :result-types result-types :width width)))
160 (values q (column-names q))
163 (multiple-value-bind (data col-names)
164 (db-query db expr :result-types result-types :width width)
167 (if (consp data) (length data) data))
169 (values data col-names))
173 (defun fetch-row (query &optional (eof-errorp t) eof-value)
174 (multiple-value-bind (row query count) (db-fetch-query-results query 1)
179 (error 'clsql-odbc-error :odbc-message "Ran out of data in fetch-row"))
185 (defun close-query (query)
186 (db-close-query query))
188 (defun list-all-database-tables (&key db hstmt)
189 (declare (ignore hstmt))
190 (let ((query (get-free-query db)))
193 (with-slots (hstmt) query
194 (unless hstmt (setf hstmt (%new-statement-handle (hdbc db))))
196 (%initialize-query query nil nil)
198 (db-fetch-query-results query)
199 (coerce (column-names query) 'list))))
200 (db-close-query query))))
202 (defun list-table-indexes (table &key db unique hstmt)
203 (declare (ignore hstmt))
204 (let ((query (get-free-query db)))
207 (with-slots (hstmt) query
209 (setf hstmt (%new-statement-handle (hdbc db))))
210 (%table-statistics table hstmt :unique unique)
211 (%initialize-query query nil nil)
213 (db-fetch-query-results query)
214 (coerce (column-names query) 'list))))
215 (db-close-query query))))
217 (defun list-all-table-columns (table &key db hstmt)
218 (declare (ignore hstmt))
219 (db-describe-columns db "" "" table ""))
221 (defun list-all-data-sources ()
222 (let ((db (make-instance 'odbc-db)))
223 (unless (henv db) ;; has class allocation!
224 (setf (henv db) (%new-environment-handle)))
225 (%list-data-sources (henv db))))
227 (defun rr-sql (hstmt sql-statement &key db)
228 (declare (ignore hstmt sql-statement db))
229 (warn "rr-sql not implemented."))
231 ;;; Mid-level interface
233 (defun db-commit (database)
234 (%commit (henv database) (hdbc database)))
236 (defun db-rollback (database)
237 (%rollback (henv database) (hdbc database)))
239 (defun db-cancel-query (query)
240 (with-slots (hstmt) query
242 (setf (query-active-p query) nil)))
245 (defmacro with-transaction (&body body)
247 (:henv (henv ,*default-database*) :hdbc (hdbc ,*default-database*))
250 (defmethod initialize-instance :after ((query odbc-query)
251 &key sql henv hdbc &allow-other-keys)
253 (let ((hstmt (%new-statement-handle hdbc)))
254 (%sql-exec-direct sql hstmt henv hdbc)
255 (with-slots (column-count
256 column-names column-c-types column-sql-types column-data-ptrs
257 column-out-len-ptrs column-precisions column-scales
258 column-nullables-p active-p) query
259 (setf (hstmt query) hstmt)
260 (%initialize-query query nil nil)
261 (setf active-p t)))))
263 ;; one for odbc-db is missing
264 (defmethod terminate ((query odbc-query))
265 ;;(format tb::*local-output* "~%*** terminated: ~s" query)
266 (with-slots (hstmt) query
268 ;(%free-statement hstmt :drop)
269 (uffi:free-foreign-object hstmt)) ;; ??
270 (%dispose-column-ptrs query)))
272 (defun %dispose-column-ptrs (query)
273 (with-slots (column-data-ptrs column-out-len-ptrs hstmt) query
274 (loop for data-ptr across column-data-ptrs
275 when data-ptr do (uffi:free-foreign-object data-ptr))
276 (loop for out-len-ptr across column-out-len-ptrs
277 when out-len-ptr do (uffi:free-foreign-object out-len-ptr))))
279 (defmethod db-open-query ((database odbc-db) query-expression
280 &key arglen col-positions result-types width
282 (db-open-query (get-free-query database) query-expression
283 :arglen arglen :col-positions col-positions
284 :result-types result-types
285 :width (if width width (db-width database))))
287 (defmethod db-open-query ((query odbc-query) query-expression
288 &key arglen col-positions result-types width
290 (%db-execute query query-expression)
291 (%initialize-query query arglen col-positions :result-types result-types
294 (defmethod db-fetch-query-results ((database odbc-db) &optional count)
295 (db-fetch-query-results (db-query-object database) count))
297 (defmethod db-fetch-query-results ((query odbc-query) &optional count)
298 (when (query-active-p query)
299 (with-slots (column-count column-data-ptrs column-c-types column-sql-types
300 column-out-len-ptrs column-precisions hstmt computed-result-types)
302 (let* ((rows-fetched 0)
305 until (or (and count (= i count))
306 (= (%sql-fetch hstmt) odbc::$SQL_NO_DATA_FOUND))
308 (loop for result-type across computed-result-types
309 for data-ptr across column-data-ptrs
310 for c-type across column-c-types
311 for sql-type across column-sql-types
312 for out-len-ptr across column-out-len-ptrs
313 for precision across column-precisions
314 for j from 0 ; column count is zero based in lisp
318 (cond ((< 0 precision (query-width query))
319 (read-data data-ptr c-type sql-type out-len-ptr result-type))
320 ((zerop (get-cast-long out-len-ptr))
323 (read-data-in-chunks hstmt j data-ptr c-type sql-type
324 out-len-ptr result-type))))))))
325 (values rows query rows-fetched)))))
327 (defun db-query (database query-expression &key result-types width)
328 (let ((free-query (get-free-query database)))
329 (setf (sql-expression free-query) query-expression)
332 (%db-execute free-query query-expression)
333 (%initialize-query free-query nil nil :result-types result-types :width width)
334 (if (plusp (column-count free-query)) ;; KMR: Added check for commands that don't return columns
336 (db-fetch-query-results free-query nil)
337 (map 'list #'identity (column-names free-query)))
339 (result-rows-count (hstmt free-query))
341 (db-close-query free-query)
344 (defmethod %db-execute ((database odbc-db) sql-expression &key &allow-other-keys)
345 (%db-execute (get-free-query database) sql-expression))
347 (defmethod %db-execute ((query odbc-query) sql-expression &key &allow-other-keys)
348 (with-slots (henv hdbc) (odbc::query-database query)
349 (with-slots (hstmt) query
350 (unless hstmt (setf hstmt (%new-statement-handle hdbc)))
351 (setf (sql-expression query) sql-expression)
352 (%sql-exec-direct sql-expression hstmt henv hdbc)
355 ;; reuse inactive queries
356 (defun get-free-query (database)
357 "get-free-query finds or makes a nonactive query object, and then sets it to active.
358 This makes the functions db-execute-command and db-query thread safe."
359 (with-slots (queries hdbc) database
360 (or (clsql-base:without-interrupts
361 (let ((inactive-query (find-if (lambda (query)
362 (not (query-active-p query)))
365 (with-slots (column-count column-names column-c-types
367 column-sql-types column-data-ptrs
368 column-out-len-ptrs column-precisions
369 column-scales column-nullables-p)
371 ;;(print column-data-ptrs tb::*local-output*)
372 ;;(%dispose-column-ptrs inactive-query)
374 width +max-precision+
375 ;; KMR hstmt (%new-statement-handle hdbc)
376 (fill-pointer column-names) 0
377 (fill-pointer column-c-types) 0
378 (fill-pointer column-sql-types) 0
379 (fill-pointer column-data-ptrs) 0
380 (fill-pointer column-out-len-ptrs) 0
381 (fill-pointer column-precisions) 0
382 (fill-pointer column-scales) 0
383 (fill-pointer column-nullables-p) 0))
384 (setf (query-active-p inactive-query) t))
386 (let ((new-query (make-instance 'odbc-query
388 ;;(clone-database database)
390 (push new-query queries)
393 (defmethod db-execute-command ((database odbc-db) sql-string)
394 (db-execute-command (get-free-query database) sql-string))
396 (defmethod db-execute-command ((query odbc-query) sql-string)
397 (with-slots (hstmt database) query
398 (with-slots (henv hdbc) database
399 (unless hstmt (setf hstmt (%new-statement-handle hdbc)))
401 (%sql-exec-direct sql-string hstmt henv hdbc)
402 (db-close-query query)))))
404 (defmethod %initialize-query ((database odbc-db) arglen col-positions &key result-types width)
405 (%initialize-query (db-query-object database) arglen col-positions
406 :result-types result-types
407 :width (if width width (db-width database))))
409 (defmethod %initialize-query ((query odbc-query) arglen col-positions &key result-types width)
410 (with-slots (hstmt computed-result-types
411 column-count column-names column-c-types column-sql-types
412 column-data-ptrs column-out-len-ptrs column-precisions
413 column-scales column-nullables-p)
415 (setf column-count (if arglen
416 (min arglen (result-columns-count hstmt))
417 (result-columns-count hstmt)))
418 (when width (setf (query-width query) width))
419 ;;(format tb::*local-output* "~%column-count: ~d, col-positions: ~d" column-count col-positions)
420 (labels ((initialize-column (col-nr)
421 (multiple-value-bind (name sql-type precision scale nullable-p)
422 (%describe-column hstmt (1+ col-nr))
423 ;; allocate space to bind result rows to
424 (multiple-value-bind (c-type data-ptr out-len-ptr size long-p)
425 (%allocate-bindings sql-type precision)
426 (unless long-p ;; if long-p we fetch in chunks with %sql-get-data
427 (%bind-column hstmt col-nr c-type data-ptr (1+ size) out-len-ptr))
428 (vector-push-extend name column-names)
429 (vector-push-extend sql-type column-sql-types)
430 (vector-push-extend (sql-to-c-type sql-type) column-c-types)
431 (vector-push-extend precision column-precisions)
432 (vector-push-extend scale column-scales)
433 (vector-push-extend nullable-p column-nullables-p)
434 (vector-push-extend data-ptr column-data-ptrs)
435 (vector-push-extend out-len-ptr column-out-len-ptrs)))))
437 (dolist (col-nr col-positions)
438 (initialize-column col-nr))
439 (dotimes (col-nr column-count)
440 ;; get column information
441 (initialize-column col-nr))))
443 (setf computed-result-types (make-array column-count))
444 (dotimes (i column-count)
445 (setf (aref computed-result-types i)
447 ((consp result-types)
448 (nth i result-types))
449 ((eq result-types :auto)
450 (if (eq (aref column-sql-types i) odbc::$SQL_BIGINT)
452 (case (aref column-c-types i)
453 (#.odbc::$SQL_C_SLONG :int)
454 (#.odbc::$SQL_C_DOUBLE :double)
455 (#.odbc::$SQL_C_FLOAT :float)
456 (#.odbc::$SQL_C_SSHORT :short)
457 (#.odbc::$SQL_C_STINYINT :short)
458 (#.odbc::$SQL_BIGINT :short)
464 (defun db-close-query (query &key drop-p)
465 (with-slots (hstmt column-count column-names column-c-types column-sql-types
466 column-data-ptrs column-out-len-ptrs column-precisions
467 column-scales column-nullables-p) query
468 (let ((count (fill-pointer column-data-ptrs)))
469 (when (not (zerop count))
470 (dotimes (col-nr count)
471 (let ((data-ptr (aref column-data-ptrs col-nr))
472 (out-len-ptr (aref column-out-len-ptrs col-nr)))
473 (declare (ignorable data-ptr out-len-ptr))
474 ;; free-statment :unbind frees these
475 #+ignore (when data-ptr (uffi:free-foreign-object data-ptr))
476 #+ignore (when out-len-ptr (uffi:free-foreign-object out-len-ptr)))))
480 (%free-statement hstmt :drop)
483 (%free-statement hstmt :unbind)
484 (%free-statement hstmt :reset)
485 (%free-statement hstmt :close)))
486 (setf (query-active-p query) nil)))
489 (defmethod %read-query-data ((database odbc-db) ignore-columns)
490 (%read-query-data (db-query-object database) ignore-columns))
492 (defmethod %read-query-data ((query odbc-query) ignore-columns)
493 (with-slots (hstmt column-count column-c-types column-sql-types
494 column-data-ptrs column-out-len-ptrs column-precisions
495 computed-result-types)
497 (unless (= (odbc::SQLFetch hstmt) odbc::$SQL_NO_DATA_FOUND)
499 (loop for col-nr from 0 to (- column-count
500 (if (eq ignore-columns :last) 2 1))
501 for result-type across computed-result-types
503 (let ((precision (aref column-precisions col-nr))
504 (sql-type (aref column-sql-types col-nr)))
505 (cond ((or (< 0 precision (query-width query))
506 (and (zerop precision) (not (find sql-type '($SQL_C_CHAR)))))
507 (read-data (aref column-data-ptrs col-nr)
508 (aref column-c-types col-nr)
510 (aref column-out-len-ptrs col-nr)
512 ((zerop (get-cast-long (aref column-out-len-ptrs col-nr)))
515 (read-data-in-chunks hstmt col-nr
516 (aref column-data-ptrs col-nr)
517 (aref column-c-types col-nr)
518 (aref column-sql-types col-nr)
519 (aref column-out-len-ptrs col-nr)
523 (defmethod db-map-query ((database odbc-db) type function query-exp &key result-types)
524 (db-map-query (get-free-query database) type function query-exp :result-types result-types))
526 (defmethod db-map-query ((query odbc-query) type function query-exp &key result-types)
527 (declare (ignore type)) ; preliminary. Do a type coersion here
528 (%db-execute query (sql-expression query-exp))
531 (%initialize-query query nil nil :result-types result-types)
533 (loop for data = (%read-query-data query nil)
535 do (apply function data)))
536 ;; dispose of memory and set query inactive or get rid of it
537 (db-close-query query)))
539 (defun db-map-bind-query (query type function
541 (declare (ignore type)) ; preliminary. Do a type coersion here
544 (apply #'%db-bind-execute query parameters)
547 while (setf data (%read-query-data query nil))
548 do (apply function data)))
549 ;; dispose of memory and set query inactive or get rid of it
550 (%db-reset-query query)))
552 ;; does not always return exactly a lisp type...
553 (defun sql-to-lisp-type (sql-type)
555 ((#.odbc::$SQL_CHAR #.odbc::$SQL_VARCHAR #.odbc::$SQL_LONGVARCHAR) :string)
556 ((#.odbc::$SQL_NUMERIC #.odbc::$SQL_DECIMAL #.odbc::$SQL_BIGINT) :string) ; ??
557 (#.odbc::$SQL_INTEGER :long)
558 (#.odbc::$SQL_SMALLINT :short)
559 ((#.odbc::$SQL_FLOAT #.odbc::$SQL_DOUBLE) :long)
560 (#.odbc::$SQL_REAL :long)
561 (#.odbc::$SQL_DATE 'sql-c-date)
562 (#.odbc::$SQL_TIME 'sql-c-time)
563 (#.odbc::$SQL_TIMESTAMP 'sql-c-timestamp)
564 ;;((#.odbc::$SQL_BINARY #.odbc::$SQL_VARBINARY #.odbc::$SQL_LONGVARBINARY) odbc::$SQL_C_BINARY) ; ??
565 (#.odbc::$SQL_TINYINT :short)
566 ;;(#.odbc::$SQL_BIT odbc::$SQL_C_BIT) ; ??
567 ((#.odbc::$SQL_VARBINARY #.odbc::$SQL_LONGVARBINARY) :binary)
572 (defmethod db-prepare-statement ((database odbc-db) sql
573 &key parameter-table parameter-columns)
574 (with-slots (hdbc) database
575 (let ((query (get-free-query database)))
576 (with-slots (hstmt) query
577 (unless hstmt (setf hstmt (%new-statement-handle hdbc))))
578 (db-prepare-statement query sql parameter-table parameter-columns))))
580 (defmethod db-prepare-statement ((query odbc-query) (sql string)
581 &key parameter-table parameter-columns)
582 ;; this is a workaround to get hold of the column types when the driver does not
583 ;; support SQLDescribeParam. To do: put code in here for drivers that do
585 (unless (string-equal sql "insert" :end1 6)
586 (error "Only insert expressions are supported in literal ODBC: '~a'." sql))
587 (%db-execute query (format nil "select ~{~a~^,~} from ~a where 0 = 1"
588 (or parameter-columns '("*")) parameter-table))
589 (%initialize-query query nil nil)
590 (with-slots (hstmt) query
591 (%free-statement hstmt :unbind)
592 (%free-statement hstmt :reset)
593 (setf (sql-expression query) sql)
594 (%sql-prepare hstmt sql))
598 (defun %db-bind-execute (query &rest parameters)
599 (with-slots (hstmt parameter-data-ptrs) query
600 (loop for parameter in parameters
601 with data-ptr and size and parameter-string
603 (setf parameter-string
604 (if (stringp parameter)
606 (write-to-string parameter))
607 size (length parameter-string)
609 (uffi:allocate-foreign-string (1+ size)))
610 (vector-push-extend data-ptr parameter-data-ptrs)
612 hstmt (1- (fill-pointer parameter-data-ptrs)) odbc::$SQL_PARAM_INPUT
613 odbc::$SQL_C_CHAR ; (aref column-c-types parameter-count)
614 odbc::$SQL_CHAR ; sql-type
615 (query-width query) ;precision ; this should be the actual precision!
617 0 ;; should be calculated for odbc::$SQL_DECIMAL,
618 ;;$SQL_NUMERIC and odbc::$SQL_TIMESTAMP
619 data-ptr ;; = rgbValue
622 ;; change this for output and binary input! (see 3-32)
624 (%put-str data-ptr parameter-string size))
625 (%sql-execute hstmt)))
628 (defun %db-reset-query (query)
629 (with-slots (hstmt parameter-data-ptrs) query
631 (db-fetch-query-results query nil)
632 (%free-statement hstmt :reset) ;; but _not_ :unbind !
633 (%free-statement hstmt :close)
634 (dotimes (param-nr (fill-pointer parameter-data-ptrs))
635 (let ((data-ptr (aref parameter-data-ptrs param-nr)))
636 (when data-ptr (uffi:free-foreign-object data-ptr))))
637 (setf (fill-pointer parameter-data-ptrs) 0))))
639 (defun data-parameter-ptr (hstmt)
640 (uffi:with-foreign-object (param-ptr :pointer-void)
641 (let ((return-code (%sql-param-data hstmt param-ptr)))
642 ;;(format t "~%return-code from %sql-param-data: ~a~%" return-code)
643 (when (= return-code odbc::$SQL_NEED_DATA)
644 ;;(ffc::%pointer-to-address (%get-ptr param-ptr))
645 (uffi:deref-pointer param-ptr :pointer-void)))))
647 ;; database inquiery functions
649 (defun db-describe-columns (database table-qualifier table-owner
650 table-name column-name)
651 (with-slots (hdbc) database
652 (%describe-columns hdbc table-qualifier table-owner table-name column-name)))
654 ;; should translate info-type integers to keywords in order to make this
656 (defmethod get-odbc-info ((database odbc-db) info-type)
657 (with-slots (hdbc info) database
658 (or (gethash info-type info)
659 (setf (gethash info-type info)
660 (%sql-get-info hdbc info-type)))))
662 (defmethod get-odbc-info ((query odbc-query) info-type)
663 (get-odbc-info (odbc::query-database query) info-type))
666 ;; How does this differ from list-data-sources?
667 (defgeneric db-data-sources (db-type))
668 (defmethod db-data-sources ((db-type (eql :odbc)))
669 "Returns a list of (data-source description) - pairs"
670 (let ((henv (%new-environment-handle)))
672 (loop with direction = :first
673 for data-source+description
674 = (multiple-value-list (%sql-data-sources henv :direction direction))
675 while (car data-source+description)
676 collect data-source+description
677 do (setf direction :next))
678 (%sql-free-environment henv))))