X-Git-Url: http://git.kpe.io/?p=clsql.git;a=blobdiff_plain;f=db-odbc%2Fodbc-dbi.lisp;h=634a43e2601f101cc9b19e51d6aea0be108925a5;hp=6b11714cfc7f4ba5553eba3c956be0437062c5d7;hb=5148be446aee32ec705beac3fbba35f499df4fd4;hpb=8133ca7db26e719bb534c036207b7aba1d6a4b75 diff --git a/db-odbc/odbc-dbi.lisp b/db-odbc/odbc-dbi.lisp index 6b11714..634a43e 100644 --- a/db-odbc/odbc-dbi.lisp +++ b/db-odbc/odbc-dbi.lisp @@ -7,7 +7,7 @@ ;;;; Author: Kevin M. Rosenberg ;;;; Create: April 2004 ;;;; -;;;; $Id: odbc-sql.lisp 8983 2004-04-12 21:16:48Z kevin $ +;;;; $Id$ ;;;; ;;;; This file, part of CLSQL, is Copyright (c) 2002 by Kevin M. Rosenberg ;;;; @@ -30,8 +30,10 @@ #:disconnect #:end-transaction #:fetch-row + #:list-all-data-sources #:list-all-database-tables #:list-all-table-columns + #:list-table-indexes #:loop-over-results #:prepare-sql #:rr-sql @@ -44,25 +46,636 @@ #:*default-odbc-external-format* #:*null-value* ) - (:documentation "This is the mid-level interface ODBC."))) + (:documentation "This is the mid-level interface ODBC.")) (in-package #:odbc-dbi) -(defun connect (&key user password data-source-name) - (warn "Not implemented.") - nil) +(defgeneric terminate (src)) +(defgeneric db-open-query (src query-expression + &key arglen col-positions result-types width + &allow-other-keys)) +(defgeneric db-fetch-query-results (src &optional count)) +(defgeneric %db-execute (src sql-expression &key &allow-other-keys)) +(defgeneric db-execute-command (src sql-string)) -(defun disconnect (conn) - (warn "Not implemented.")) +(defgeneric %initialize-query (src arglen col-positions + &key result-types width)) -(defun query (expr &key db result-types row-count column-names) - (warn "Not implemented.")) +(defgeneric %read-query-data (src ignore-columns)) +(defgeneric db-map-query (src type function query-exp &key result-types)) +(defgeneric db-prepare-statement (src sql &key parameter-table + parameter-columns)) +(defgeneric get-odbc-info (src info-type)) -(defun execute (expr conn) - (warn "Not implemented.")) -(defun close-query (result-set) - (warn "Not implemented.")) +;;; SQL Interface -(defun fetch-row (result-set error-eof eof-value) - (warn "Not implemented.")) +(defclass odbc-db () + (;; any reason to have more than one henv? + (width :initform +max-precision+ :accessor db-width) + (hstmt :initform nil :accessor db-hstmt) + (henv :initform nil :allocation :class :initarg :henv :accessor henv) + (hdbc :initform nil :initarg :hdbc :accessor hdbc) + ;; info returned from SQLGetInfo + (info :initform (make-hash-table) :reader db-info) + (type :initform nil :initarg :db-type :reader db-type) + (connected-p :initform nil :accessor db-connected-p) + ;; not used yet + (count :initform 0 :initarg :count :accessor db-count) + ;; not used yet + (total-count :initform 0 :allocation :class :accessor db-total-count) + ;; the use of this slot is deprecated; it will be removed when dtf works without it. + (query :initform nil :accessor db-query-object) + ;; resource of (active and inactive) query objects + (queries :initform () :accessor db-queries))) + +(defclass odbc-query () + ((hstmt :initform nil :initarg :hstmt :accessor hstmt) ; = cursor?? + (width :initform +max-precision+ :accessor query-width) + (computed-result-types :initform nil :initarg :computed-result-types :accessor computed-result-types) + (column-count :initform nil :accessor column-count) + (column-names :initform (make-array 0 :element-type 'string :adjustable t :fill-pointer t) + :accessor column-names) + (column-c-types :initform (make-array 0 :element-type 'fixnum :adjustable t :fill-pointer t) + :accessor column-c-types) + (column-sql-types :initform (make-array 0 :element-type 'fixnum :adjustable t :fill-pointer t) + :accessor column-sql-types) + (column-data-ptrs :initform (make-array 0 :adjustable t :fill-pointer t) + :accessor data-ptrs) + (column-out-len-ptrs :initform (make-array 0 :adjustable t :fill-pointer t) + :accessor column-out-len-ptrs) + (column-precisions :initform (make-array 0 :element-type 'fixnum :adjustable t :fill-pointer t) + :accessor column-precisions) + (column-scales :initform (make-array 0 :element-type 'fixnum :adjustable t :fill-pointer t) + :accessor column-scales) + (column-nullables-p :initform (make-array 0 :element-type 'fixnum :adjustable t :fill-pointer t) + :accessor column-nullables-p) + ;;(parameter-count :initform 0 :accessor parameter-count) + (parameter-data-ptrs :initform (make-array 0 :adjustable t :fill-pointer t) + :accessor parameter-ptrs) + ;; a query string or a query expression object + (sql-expression :initform nil :initarg :sql-expression :accessor sql-expression) + ;; database object the query is to be run against + (database :initarg :database :reader query-database) + (active-p :initform nil :initarg :active-p :accessor query-active-p)) + (:documentation + "Stores query information, like SQL query string/expression and database to run +the query against." )) + +;;; AODBC Compatible interface + +(defun connect (&key data-source-name user password (autocommit t)) + (let ((db (make-instance 'odbc-db))) + (unless (henv db) ;; has class allocation! + (setf (henv db) (%new-environment-handle))) + (setf (hdbc db) (%new-db-connection-handle (henv db))) + (%sql-connect (hdbc db) data-source-name user password) + #+ignore (setf (db-hstmt db) (%new-statement-handle (hdbc db))) + (when (/= (get-odbc-info db odbc::$SQL_TXN_CAPABLE) odbc::$SQL_TC_NONE) + (if autocommit + (enable-autocommit (hdbc db)) + (disable-autocommit (hdbc db)))) + db)) + +(defun disconnect (database) + (with-slots (hdbc queries) database + (dolist (query queries) + (if (query-active-p query) + (with-slots (hstmt) query + (when hstmt + (%free-statement hstmt :drop) + (setf hstmt nil))))) + (when (db-hstmt database) + (%free-statement (db-hstmt database) :drop)) + (%disconnect hdbc))) + + +(defun sql (expr &key db result-types row-count (column-names t) query + hstmt width) + (declare (ignore hstmt)) + (cond + (query + (let ((q (db-open-query db expr :result-types result-types :width width))) + (if column-names + (values q (column-names q)) + q))) + (t + (multiple-value-bind (data col-names) + (db-query db expr :result-types result-types :width width) + (cond + (row-count + (if (consp data) (length data) data)) + (column-names + (values data col-names)) + (t + data)))))) + +(defun fetch-row (query &optional (eof-errorp t) eof-value) + (multiple-value-bind (row query count) (db-fetch-query-results query 1) + (cond + ((zerop count) + (close-query query) + (when eof-errorp + (error 'clsql:sql-database-data-error + :message "ODBC: Ran out of data in fetch-row")) + eof-value) + (t + (car row))))) + + +(defun close-query (query) + (db-close-query query)) + +(defun list-all-database-tables (&key db hstmt) + (declare (ignore hstmt)) + (let ((query (get-free-query db))) + (unwind-protect + (progn + (with-slots (hstmt) query + (unless hstmt (setf hstmt (%new-statement-handle (hdbc db)))) + (%list-tables hstmt) + (%initialize-query query nil nil) + (values + (db-fetch-query-results query) + (coerce (column-names query) 'list)))) + (db-close-query query)))) + +(defun list-table-indexes (table &key db unique hstmt) + (declare (ignore hstmt)) + (let ((query (get-free-query db))) + (unwind-protect + (progn + (with-slots (hstmt) query + (unless hstmt + (setf hstmt (%new-statement-handle (hdbc db)))) + (%table-statistics table hstmt :unique unique) + (%initialize-query query nil nil) + (values + (db-fetch-query-results query) + (coerce (column-names query) 'list)))) + (db-close-query query)))) + +(defun list-all-table-columns (table &key db hstmt) + (declare (ignore hstmt)) + (db-describe-columns db "" "" table "")) + +(defun list-all-data-sources () + (let ((db (make-instance 'odbc-db))) + (unless (henv db) ;; has class allocation! + (setf (henv db) (%new-environment-handle))) + (%list-data-sources (henv db)))) + +(defun rr-sql (hstmt sql-statement &key db) + (declare (ignore hstmt sql-statement db)) + (warn "rr-sql not implemented.")) + +;;; Mid-level interface + +(defun db-commit (database) + (%commit (henv database) (hdbc database))) + +(defun db-rollback (database) + (%rollback (henv database) (hdbc database))) + +(defun db-cancel-query (query) + (with-slots (hstmt) query + (%sql-cancel hstmt) + (setf (query-active-p query) nil))) + +#+simple-version +(defmacro with-transaction (&body body) + `(%with-transaction + (:henv (henv ,*default-database*) :hdbc (hdbc ,*default-database*)) + ,@body)) + +(defmethod initialize-instance :after ((query odbc-query) + &key sql henv hdbc &allow-other-keys) + (when sql + (let ((hstmt (%new-statement-handle hdbc))) + (%sql-exec-direct sql hstmt henv hdbc) + (with-slots (column-count + column-names column-c-types column-sql-types column-data-ptrs + column-out-len-ptrs column-precisions column-scales + column-nullables-p active-p) query + (setf (hstmt query) hstmt) + (%initialize-query query nil nil) + (setf active-p t))))) + +;; one for odbc-db is missing +(defmethod terminate ((query odbc-query)) + ;;(format tb::*local-output* "~%*** terminated: ~s" query) + (with-slots (hstmt) query + (when hstmt + ;(%free-statement hstmt :drop) + (uffi:free-foreign-object hstmt)) ;; ?? + (%dispose-column-ptrs query))) + +(defun %dispose-column-ptrs (query) + (with-slots (column-data-ptrs column-out-len-ptrs hstmt) query + (loop for data-ptr across column-data-ptrs + when data-ptr do (uffi:free-foreign-object data-ptr)) + (loop for out-len-ptr across column-out-len-ptrs + when out-len-ptr do (uffi:free-foreign-object out-len-ptr)))) + +(defmethod db-open-query ((database odbc-db) query-expression + &key arglen col-positions result-types width + &allow-other-keys) + (db-open-query (get-free-query database) query-expression + :arglen arglen :col-positions col-positions + :result-types result-types + :width (if width width (db-width database)))) + +(defmethod db-open-query ((query odbc-query) query-expression + &key arglen col-positions result-types width + &allow-other-keys) + (%db-execute query query-expression) + (%initialize-query query arglen col-positions :result-types result-types + :width width)) + +(defmethod db-fetch-query-results ((database odbc-db) &optional count) + (db-fetch-query-results (db-query-object database) count)) + +(defmethod db-fetch-query-results ((query odbc-query) &optional count) + (when (query-active-p query) + (with-slots (column-count column-data-ptrs column-c-types column-sql-types + column-out-len-ptrs column-precisions hstmt computed-result-types) + query + (let* ((rows-fetched 0) + (rows + (loop for i from 0 + until (or (and count (= i count)) + (= (%sql-fetch hstmt) odbc::$SQL_NO_DATA_FOUND)) + collect + (loop for result-type across computed-result-types + for data-ptr across column-data-ptrs + for c-type across column-c-types + for sql-type across column-sql-types + for out-len-ptr across column-out-len-ptrs + for precision across column-precisions + for j from 0 ; column count is zero based in lisp + collect + (progn + (incf rows-fetched) + (cond ((< 0 precision (query-width query)) + (read-data data-ptr c-type sql-type out-len-ptr result-type)) + ((zerop (get-cast-long out-len-ptr)) + nil) + (t + (read-data-in-chunks hstmt j data-ptr c-type sql-type + out-len-ptr result-type)))))))) + (values rows query rows-fetched))))) + +(defun db-query (database query-expression &key result-types width) + (let ((free-query (get-free-query database))) + (setf (sql-expression free-query) query-expression) + (unwind-protect + (progn + (%db-execute free-query query-expression) + (%initialize-query free-query nil nil :result-types result-types :width width) + (if (plusp (column-count free-query)) ;; KMR: Added check for commands that don't return columns + (values + (db-fetch-query-results free-query nil) + (map 'list #'identity (column-names free-query))) + (values + (result-rows-count (hstmt free-query)) + nil))) + (db-close-query free-query) + ))) + +(defmethod %db-execute ((database odbc-db) sql-expression &key &allow-other-keys) + (%db-execute (get-free-query database) sql-expression)) + +(defmethod %db-execute ((query odbc-query) sql-expression &key &allow-other-keys) + (with-slots (henv hdbc) (odbc::query-database query) + (with-slots (hstmt) query + (unless hstmt (setf hstmt (%new-statement-handle hdbc))) + (setf (sql-expression query) sql-expression) + (%sql-exec-direct sql-expression hstmt henv hdbc) + query))) + +;; reuse inactive queries +(defun get-free-query (database) + "get-free-query finds or makes a nonactive query object, and then sets it to active. +This makes the functions db-execute-command and db-query thread safe." + (with-slots (queries hdbc) database + (or (clsql-sys:without-interrupts + (let ((inactive-query (find-if (lambda (query) + (not (query-active-p query))) + queries))) + (when inactive-query + (with-slots (column-count column-names column-c-types + width hstmt + column-sql-types column-data-ptrs + column-out-len-ptrs column-precisions + column-scales column-nullables-p) + inactive-query + ;;(print column-data-ptrs tb::*local-output*) + ;;(%dispose-column-ptrs inactive-query) + (setf column-count 0 + width +max-precision+ + ;; KMR hstmt (%new-statement-handle hdbc) + (fill-pointer column-names) 0 + (fill-pointer column-c-types) 0 + (fill-pointer column-sql-types) 0 + (fill-pointer column-data-ptrs) 0 + (fill-pointer column-out-len-ptrs) 0 + (fill-pointer column-precisions) 0 + (fill-pointer column-scales) 0 + (fill-pointer column-nullables-p) 0)) + (setf (query-active-p inactive-query) t)) + inactive-query)) + (let ((new-query (make-instance 'odbc-query + :database database + ;;(clone-database database) + :active-p t))) + (push new-query queries) + new-query)))) + +(defmethod db-execute-command ((database odbc-db) sql-string) + (db-execute-command (get-free-query database) sql-string)) + +(defmethod db-execute-command ((query odbc-query) sql-string) + (with-slots (hstmt database) query + (with-slots (henv hdbc) database + (unless hstmt (setf hstmt (%new-statement-handle hdbc))) + (unwind-protect + (%sql-exec-direct sql-string hstmt henv hdbc) + (db-close-query query))))) + +(defmethod %initialize-query ((database odbc-db) arglen col-positions &key result-types width) + (%initialize-query (db-query-object database) arglen col-positions + :result-types result-types + :width (if width width (db-width database)))) + +(defmethod %initialize-query ((query odbc-query) arglen col-positions &key result-types width) + (with-slots (hstmt computed-result-types + column-count column-names column-c-types column-sql-types + column-data-ptrs column-out-len-ptrs column-precisions + column-scales column-nullables-p) + query + (setf column-count (if arglen + (min arglen (result-columns-count hstmt)) + (result-columns-count hstmt))) + (when width (setf (query-width query) width)) + ;;(format tb::*local-output* "~%column-count: ~d, col-positions: ~d" column-count col-positions) + (labels ((initialize-column (col-nr) + (multiple-value-bind (name sql-type precision scale nullable-p) + (%describe-column hstmt (1+ col-nr)) + ;; allocate space to bind result rows to + (multiple-value-bind (c-type data-ptr out-len-ptr size long-p) + (%allocate-bindings sql-type precision) + (unless long-p ;; if long-p we fetch in chunks with %sql-get-data + (%bind-column hstmt col-nr c-type data-ptr (1+ size) out-len-ptr)) + (vector-push-extend name column-names) + (vector-push-extend sql-type column-sql-types) + (vector-push-extend (sql-to-c-type sql-type) column-c-types) + (vector-push-extend precision column-precisions) + (vector-push-extend scale column-scales) + (vector-push-extend nullable-p column-nullables-p) + (vector-push-extend data-ptr column-data-ptrs) + (vector-push-extend out-len-ptr column-out-len-ptrs))))) + (if col-positions + (dolist (col-nr col-positions) + (initialize-column col-nr)) + (dotimes (col-nr column-count) + ;; get column information + (initialize-column col-nr)))) + + (setf computed-result-types (make-array column-count)) + (dotimes (i column-count) + (setf (aref computed-result-types i) + (cond + ((consp result-types) + (nth i result-types)) + ((eq result-types :auto) + (if (eq (aref column-sql-types i) odbc::$SQL_BIGINT) + :number + (case (aref column-c-types i) + (#.odbc::$SQL_C_SLONG :int) + (#.odbc::$SQL_C_DOUBLE :double) + (#.odbc::$SQL_C_FLOAT :float) + (#.odbc::$SQL_C_SSHORT :short) + (#.odbc::$SQL_C_STINYINT :short) + (#.odbc::$SQL_BIGINT :short) + (t t)))) + (t + t))))) + query) + +(defun db-close-query (query &key drop-p) + (with-slots (hstmt column-count column-names column-c-types column-sql-types + column-data-ptrs column-out-len-ptrs column-precisions + column-scales column-nullables-p) query + (let ((count (fill-pointer column-data-ptrs))) + (when (not (zerop count)) + (dotimes (col-nr count) + (let ((data-ptr (aref column-data-ptrs col-nr)) + (out-len-ptr (aref column-out-len-ptrs col-nr))) + (declare (ignorable data-ptr out-len-ptr)) + ;; free-statment :unbind frees these + #+ignore (when data-ptr (uffi:free-foreign-object data-ptr)) + #+ignore (when out-len-ptr (uffi:free-foreign-object out-len-ptr))))) + (cond ((null hstmt) + nil) + (drop-p + (%free-statement hstmt :drop) + (setf hstmt nil)) + (t + (%free-statement hstmt :unbind) + (%free-statement hstmt :reset) + (%free-statement hstmt :close))) + (setf (query-active-p query) nil))) + query) + +(defmethod %read-query-data ((database odbc-db) ignore-columns) + (%read-query-data (db-query-object database) ignore-columns)) + +(defmethod %read-query-data ((query odbc-query) ignore-columns) + (with-slots (hstmt column-count column-c-types column-sql-types + column-data-ptrs column-out-len-ptrs column-precisions + computed-result-types) + query + (unless (= (odbc::SQLFetch hstmt) odbc::$SQL_NO_DATA_FOUND) + (values + (loop for col-nr from 0 to (- column-count + (if (eq ignore-columns :last) 2 1)) + for result-type across computed-result-types + collect + (let ((precision (aref column-precisions col-nr)) + (sql-type (aref column-sql-types col-nr))) + (cond ((or (< 0 precision (query-width query)) + (and (zerop precision) (not (find sql-type '($SQL_C_CHAR))))) + (read-data (aref column-data-ptrs col-nr) + (aref column-c-types col-nr) + sql-type + (aref column-out-len-ptrs col-nr) + result-type)) + ((zerop (get-cast-long (aref column-out-len-ptrs col-nr))) + *null*) + (t + (read-data-in-chunks hstmt col-nr + (aref column-data-ptrs col-nr) + (aref column-c-types col-nr) + (aref column-sql-types col-nr) + (aref column-out-len-ptrs col-nr) + result-type))))) + t)))) + +(defmethod db-map-query ((database odbc-db) type function query-exp &key result-types) + (db-map-query (get-free-query database) type function query-exp :result-types result-types)) + +(defmethod db-map-query ((query odbc-query) type function query-exp &key result-types) + (declare (ignore type)) ; preliminary. Do a type coersion here + (%db-execute query (sql-expression query-exp)) + (unwind-protect + (progn + (%initialize-query query nil nil :result-types result-types) + ;; the main loop + (loop for data = (%read-query-data query nil) + while data + do (apply function data))) + ;; dispose of memory and set query inactive or get rid of it + (db-close-query query))) + +(defun db-map-bind-query (query type function + &rest parameters) + (declare (ignore type)) ; preliminary. Do a type coersion here + (unwind-protect + (progn + (apply #'%db-bind-execute query parameters) + ;; the main loop + (loop with data + while (setf data (%read-query-data query nil)) + do (apply function data))) + ;; dispose of memory and set query inactive or get rid of it + (%db-reset-query query))) + +;; does not always return exactly a lisp type... +(defun sql-to-lisp-type (sql-type) + (ecase sql-type + ((#.odbc::$SQL_CHAR #.odbc::$SQL_VARCHAR #.odbc::$SQL_LONGVARCHAR) :string) + ((#.odbc::$SQL_NUMERIC #.odbc::$SQL_DECIMAL #.odbc::$SQL_BIGINT) :string) ; ?? + (#.odbc::$SQL_INTEGER #.odbc::$ODBC-LONG-TYPE) + (#.odbc::$SQL_SMALLINT :short) + ((#.odbc::$SQL_FLOAT #.odbc::$SQL_DOUBLE) #.odbc::$ODBC-LONG-TYPE) + (#.odbc::$SQL_REAL #.odbc::$ODBC-LONG-TYPE) + (#.odbc::$SQL_DATE 'sql-c-date) + (#.odbc::$SQL_TIME 'sql-c-time) + (#.odbc::$SQL_TIMESTAMP 'sql-c-timestamp) + ;;((#.odbc::$SQL_BINARY #.odbc::$SQL_VARBINARY #.odbc::$SQL_LONGVARBINARY) odbc::$SQL_C_BINARY) ; ?? + (#.odbc::$SQL_TINYINT :short) + ;;(#.odbc::$SQL_BIT odbc::$SQL_C_BIT) ; ?? + ((#.odbc::$SQL_VARBINARY #.odbc::$SQL_LONGVARBINARY) :binary) + )) + +;; prepared queries + +(defmethod db-prepare-statement ((database odbc-db) sql + &key parameter-table parameter-columns) + (with-slots (hdbc) database + (let ((query (get-free-query database))) + (with-slots (hstmt) query + (unless hstmt (setf hstmt (%new-statement-handle hdbc)))) + (db-prepare-statement query sql parameter-table parameter-columns)))) + +(defmethod db-prepare-statement ((query odbc-query) (sql string) + &key parameter-table parameter-columns) + ;; this is a workaround to get hold of the column types when the driver does not + ;; support SQLDescribeParam. To do: put code in here for drivers that do + ;; support it. + (unless (string-equal sql "insert" :end1 6) + (error 'clsql:sql-database-error + (format nil + "Only insert expressions are supported in literal ODBC: '~a'." sql))) + (%db-execute query (format nil "select ~{~a~^,~} from ~a where 0 = 1" + (or parameter-columns '("*")) parameter-table)) + (%initialize-query query nil nil) + (with-slots (hstmt) query + (%free-statement hstmt :unbind) + (%free-statement hstmt :reset) + (setf (sql-expression query) sql) + (%sql-prepare hstmt sql)) + query) + + +(defun %db-bind-execute (query &rest parameters) + (with-slots (hstmt parameter-data-ptrs) query + (loop for parameter in parameters + with data-ptr and size and parameter-string + do + (setf parameter-string + (if (stringp parameter) + parameter + (write-to-string parameter)) + size (length parameter-string) + data-ptr + (uffi:allocate-foreign-string (1+ size))) + (vector-push-extend data-ptr parameter-data-ptrs) + (%sql-bind-parameter + hstmt (1- (fill-pointer parameter-data-ptrs)) odbc::$SQL_PARAM_INPUT + odbc::$SQL_C_CHAR ; (aref column-c-types parameter-count) + odbc::$SQL_CHAR ; sql-type + (query-width query) ;precision ; this should be the actual precision! + ;; scale + 0 ;; should be calculated for odbc::$SQL_DECIMAL, + ;;$SQL_NUMERIC and odbc::$SQL_TIMESTAMP + data-ptr ;; = rgbValue + 0 + ;; *pcbValue; + ;; change this for output and binary input! (see 3-32) + +null-ptr+) + (%put-str data-ptr parameter-string size)) + (%sql-execute hstmt))) + + +(defun %db-reset-query (query) + (with-slots (hstmt parameter-data-ptrs) query + (prog1 + (db-fetch-query-results query nil) + (%free-statement hstmt :reset) ;; but _not_ :unbind ! + (%free-statement hstmt :close) + (dotimes (param-nr (fill-pointer parameter-data-ptrs)) + (let ((data-ptr (aref parameter-data-ptrs param-nr))) + (when data-ptr (uffi:free-foreign-object data-ptr)))) + (setf (fill-pointer parameter-data-ptrs) 0)))) + +(defun data-parameter-ptr (hstmt) + (uffi:with-foreign-object (param-ptr :pointer-void) + (let ((return-code (%sql-param-data hstmt param-ptr))) + ;;(format t "~%return-code from %sql-param-data: ~a~%" return-code) + (when (= return-code odbc::$SQL_NEED_DATA) + ;;(ffc::%pointer-to-address (%get-ptr param-ptr)) + (uffi:deref-pointer param-ptr :pointer-void))))) + +;; database inquiery functions + +(defun db-describe-columns (database table-qualifier table-owner + table-name column-name) + (with-slots (hdbc) database + (%describe-columns hdbc table-qualifier table-owner table-name column-name))) + +;; should translate info-type integers to keywords in order to make this +;; more readable? +(defmethod get-odbc-info ((database odbc-db) info-type) + (with-slots (hdbc info) database + (or (gethash info-type info) + (setf (gethash info-type info) + (%sql-get-info hdbc info-type))))) + +(defmethod get-odbc-info ((query odbc-query) info-type) + (get-odbc-info (odbc::query-database query) info-type)) + +;; driver inquiry +;; How does this differ from list-data-sources? +(defgeneric db-data-sources (db-type)) +(defmethod db-data-sources ((db-type (eql :odbc))) + "Returns a list of (data-source description) - pairs" + (let ((henv (%new-environment-handle))) + (unwind-protect + (loop with direction = :first + for data-source+description + = (multiple-value-list (%sql-data-sources henv :direction direction)) + while (car data-source+description) + collect data-source+description + do (setf direction :next)) + (%sql-free-environment henv))))