1 ;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
2 ;;;; *************************************************************************
4 ;;;; Generic ODBC layer, used by db-odbc and db-aodbc backends
6 ;;;; This file is part of CLSQL.
8 ;;;; CLSQL users are granted the rights to distribute and use this software
9 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
10 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
11 ;;;; *************************************************************************
13 (in-package #:clsql-sys)
15 (defclass generic-odbc-database (database)
16 ((dbi-package :initarg :dbi-package :reader dbi-package)
17 (odbc-conn :initarg :odbc-conn :initform nil :accessor odbc-conn)
18 (disconnect-fn :reader disconnect-fn)
19 (sql-fn :reader sql-fn)
20 (close-query-fn :reader close-query-fn)
21 (fetch-row :reader fetch-row-fn)
22 (list-all-database-tables-fn :reader list-all-database-tables-fn)
23 (list-all-table-columns-fn :reader list-all-table-columns-fn))
24 (:documentation "Encapsulate same behavior across odbc and aodbc backends."))
26 (defmethod initialize-instance :after ((db generic-odbc-database)
28 (declare (ignore all-keys))
29 (unless (slot-boundp db 'dbi-package)
30 (error "dbi-package not specified."))
31 (let ((pkg (slot-value db 'dbi-package)))
33 (error "dbi-package is nil."))
34 (setf (slot-value db 'disconnect-fn)
35 (intern (symbol-name '#:disconnect) pkg)
36 (slot-value db 'sql-fn)
37 (intern (symbol-name '#:sql) pkg)
38 (slot-value db 'close-query-fn)
39 (intern (symbol-name '#:close-query) pkg)
40 (slot-value db 'fetch-row)
41 (intern (symbol-name '#:fetch-row) pkg)
42 (slot-value db 'list-all-database-tables-fn)
43 (intern (symbol-name '#:list-all-database-tables) pkg)
44 (slot-value db 'list-all-table-columns-fn)
45 (intern (symbol-name '#:list-all-table-columns) pkg))))
49 (defmethod read-sql-value (val (type (eql 'boolean))
50 (database generic-odbc-database)
51 (db-type (eql :postgresql)))
52 (if (string= "0" val) nil t))
54 (defmethod read-sql-value (val (type (eql 'generalized-boolean))
55 (database generic-odbc-database)
56 (db-type (eql :postgresql)))
57 (if (string= "0" val) nil t))
59 (defmethod read-sql-value (val (type (eql 'boolean)) database
60 (db-type (eql :mssql)))
61 (declare (ignore database))
63 (string (if (string= "0" val) nil t))
64 (integer (if (zerop val) nil t))))
66 (defmethod read-sql-value (val (type (eql 'generalized-boolean)) database
67 (db-type (eql :mssql)))
68 (declare (ignore database))
70 (string (if (string= "0" val) nil t))
71 (integer (if (zerop val) nil t))))
75 (defmethod database-get-type-specifier ((type symbol) args database
76 (db-type (eql :mssql)))
77 "Special database types for MSSQL backends"
78 (declare (ignore database db-type args))
80 (wall-time "DATETIME")
81 (date "SMALLDATETIME")
82 ((generalized-boolean boolean) "BIT")
83 ((longchar text) "ntext")
86 (format nil "NVARCHAR(~A)" (car args))
87 (format nil "NVARCHAR(~D)" *default-string-length*)))
88 (t (call-next-method))))
90 ;;; Generation of SQL strings from lisp expressions
92 (defmethod database-output-sql ((tee (eql t)) (database generic-odbc-database))
93 (case (database-underlying-type database)
97 ;;; Database backend capabilities
99 (defmethod db-type-use-fully-qualified-column-on-drop-index? ((db-type (eql :mssql)))
102 (defmethod db-type-has-boolean-where? ((db-type (eql :mssql)))
105 (defmethod db-type-has-intersect? ((db-type (eql :mssql)))
108 (defmethod db-type-has-except? ((db-type (eql :mssql)))
113 (defmethod database-disconnect ((database generic-odbc-database))
114 (funcall (disconnect-fn database) (odbc-conn database))
115 (setf (odbc-conn database) nil)
118 (defmethod database-query (query-expression (database generic-odbc-database)
119 result-types field-names)
121 (funcall (sql-fn database)
122 query-expression :db (odbc-conn database)
123 :result-types result-types
124 :column-names field-names)
127 (error 'sql-database-data-error
129 :expression query-expression
130 :message "Query failed"))))
133 (defmethod database-execute-command (sql-expression (database generic-odbc-database))
135 (funcall (sql-fn database)
136 sql-expression :db (odbc-conn database))
142 (error 'sql-database-data-error
144 :expression sql-expression
145 :message "Execute command failed"))))
148 (defstruct odbc-result-set
151 (full-set nil :type boolean))
156 (defmethod database-query-result-set ((query-expression string)
157 (database generic-odbc-database)
158 &key full-set result-types)
160 (multiple-value-bind (query column-names)
161 (funcall (sql-fn database)
163 :db (odbc-conn database)
167 :result-types result-types)
169 (make-odbc-result-set :query query :full-set full-set
171 (length column-names)
172 nil ;; not able to return number of rows with odbc
175 (error 'sql-database-data-error
177 :expression query-expression
178 :message "Query result set failed"))))
180 (defmethod database-dump-result-set (result-set (database generic-odbc-database))
181 (funcall (close-query-fn database) (odbc-result-set-query result-set))
184 (defmethod database-store-next-row (result-set
185 (database generic-odbc-database)
187 (let ((row (funcall (fetch-row-fn database)
188 (odbc-result-set-query result-set) nil 'eof)))
192 (loop for elem in row
195 (setf (car rest) elem))
199 (defun %database-list-* (database type owner)
200 "Internal function used by database-list-tables and
202 (multiple-value-bind (rows col-names)
203 (funcall (list-all-database-tables-fn database) :db (odbc-conn database))
204 (declare (ignore col-names))
205 ;; http://msdn.microsoft.com/en-us/library/ms711831%28VS.85%29.aspx
206 ;; TABLE_SCHEM is hard-coded in second column by ODBC Driver Manager
207 ;; TABLE_NAME in third column, TABLE_TYPE in fourth column
208 (loop for (category schema name ttype . rest) in rows
209 when (and (string-equal type ttype)
210 (or (null owner) (string-equal owner schema))
211 ;; unless requesting by name, skip system schema
212 (not (and (null owner)
213 (member schema '("information_schema" "sys")
214 :test #'string-equal)))
215 ;; skip system specific tables in mssql2000
216 (not (and (eql :mssql (database-underlying-type database))
217 (member name '("dtproperties" "sysconstraints"
219 :test #'string-equal))))
222 (defmethod database-list-tables ((database generic-odbc-database)
224 "Since ODBC doesn't expose the owner we use that parameter to filter
225 on schema since that's what tends to be exposed. Some DBs like mssql
226 2000 conflate the two so at least there it works nicely."
227 (%database-list-* database "TABLE" owner))
230 (defmethod database-list-views ((database generic-odbc-database)
232 "Since ODBC doesn't expose the owner we use that parameter to filter
233 on schema since that's what tends to be exposed. Some DBs like mssql
234 2000 conflate the two so at least there it works nicely."
235 (%database-list-* database "VIEW" owner))
238 (defmethod database-list-attributes ((table %database-identifier) (database generic-odbc-database)
240 &aux (table (unescaped-database-identifier table)))
241 (declare (ignore owner))
242 (multiple-value-bind (rows col-names)
243 (funcall (list-all-table-columns-fn database) table
244 :db (odbc-conn database))
245 (declare (ignore col-names))
246 ;; COLUMN_NAME is hard-coded by odbc spec as fourth position
247 (loop for row in rows
248 collect (fourth row))))
250 (defmethod database-attribute-type ((attribute %database-identifier) (table %database-identifier)
251 (database generic-odbc-database)
253 &aux (table (unescaped-database-identifier table))
254 (attribute (unescaped-database-identifier attribute)))
255 (declare (ignore owner))
256 (multiple-value-bind (rows col-names)
257 (funcall (list-all-table-columns-fn database) table
258 :db (odbc-conn database))
259 (declare (ignore col-names))
260 ;; COLUMN_NAME is hard-coded by odbc spec as fourth position
261 ;; TYPE_NAME is the sixth column
262 ;; PRECISION/COLUMN_SIZE is the seventh column
263 ;; SCALE/DECIMAL_DIGITS is the ninth column
264 ;; NULLABLE is the eleventh column
265 (loop for row in rows
266 when (string-equal attribute (fourth row))
268 (let ((size (seventh row))
269 (precision (ninth row))
270 (scale (nth 10 row)))
271 (return (values (ensure-keyword (sixth row))
272 (when size (parse-integer size))
273 (when precision (parse-integer precision))
274 (when scale (parse-integer scale))))))))