db-odbc/odbc-api.lisp

   1 ;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Package: odbc -*-
   2 ;;;; *************************************************************************
   3 ;;;; FILE IDENTIFICATION
   4 ;;;;
   5 ;;;; Name:     odbc-api.lisp
   6 ;;;; Purpose:  Low-level ODBC API using UFFI
   7 ;;;; Authors:  Kevin M. Rosenberg and Paul Meurer
   8 ;;;;
   9 ;;;; $Id$
  10 ;;;;
  11 ;;;; This file, part of CLSQL, is Copyright (c) 2004 by Kevin M. Rosenberg
  12 ;;;; and Copyright (C) Paul Meurer 1999 - 2001. All rights reserved.
  13 ;;;;
  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 ;;;; *************************************************************************
  18
  19 (in-package #:odbc)
  20
  21 (defvar *null* nil
  22   "Lisp representation of SQL Null value, default = nil.
  23 May be locally bound to something else if a certain type is necessary.")
  24
  25
  26 (defvar *binary-format* :unsigned-byte-vector)
  27 (defvar *time-conversion-function*
  28     (lambda (universal-time &optional fraction)
  29       (declare (ignore fraction))
  30       (clsql-sys:format-time
  31        nil (clsql-sys:utime->time universal-time)
  32        :format :iso)
  33       #+ignore
  34       universal-time)
  35    "Bound to a function that converts from a Lisp universal time fixnum (and a fractional
  36 as possible second argument) to the desired representation of date/time/timestamp. By default, returns an iso-timestring.")
  37
  38 (defvar +null-ptr+ (make-null-pointer :byte))
  39 (defparameter +null-handle-ptr+ (make-null-pointer :void))
  40 (defvar *info-output* nil
  41   "Stream to send SUCCESS_WITH_INFO messages.")
  42
  43 (defmacro %put-str (ptr string &optional max-length)
  44   (let ((size (gensym)))
  45     `(let ((,size (length ,string)))
  46        (when (and ,max-length (> ,size ,max-length))
  47          (error 'clsql:sql-database-data-error
  48                 :message
  49                 (format nil "string \"~a\" of length ~d is longer than max-length: ~d"
  50                         ,string ,size ,max-length)))
  51       (with-cast-pointer (char-ptr ,ptr :byte)
  52         (dotimes (i ,size)
  53           (setf (deref-array char-ptr '(:array :byte) i)
  54                 (char-code (char ,string i))))
  55         (setf (deref-array char-ptr '(:array :byte) ,size) 0)))))
  56
  57 (defun %cstring-into-vector (ptr vector offset size-in-bytes)
  58   (dotimes (i size-in-bytes)
  59     (setf (schar vector offset)
  60       (ensure-char-character
  61        (deref-array ptr '(:array :unsigned-char) i)))
  62     (incf offset))
  63   offset)
  64
  65 (defun handle-error (henv hdbc hstmt)
  66   (let ((sql-state (allocate-foreign-string 256))
  67         (error-message (allocate-foreign-string #.$SQL_MAX_MESSAGE_LENGTH)))
  68     (with-foreign-objects ((error-code #.$ODBC-LONG-TYPE)
  69                            (msg-length :short))
  70       (SQLError henv hdbc hstmt sql-state
  71                 error-code error-message
  72                 #.$SQL_MAX_MESSAGE_LENGTH msg-length)
  73       (let ((err (convert-from-foreign-string error-message))
  74             (state (convert-from-foreign-string sql-state)))
  75         (free-foreign-object error-message)
  76         (free-foreign-object sql-state)
  77         (values
  78          err
  79          state
  80          (deref-pointer msg-length :short)
  81          (deref-pointer error-code #.$ODBC-LONG-TYPE))))))
  82
  83 (defun sql-state (henv hdbc hstmt)
  84   (let ((sql-state (allocate-foreign-string 256))
  85         (error-message (allocate-foreign-string #.$SQL_MAX_MESSAGE_LENGTH)))
  86     (with-foreign-objects ((error-code #.$ODBC-LONG-TYPE)
  87                            (msg-length :short))
  88       (SQLError henv hdbc hstmt sql-state error-code
  89                 error-message #.$SQL_MAX_MESSAGE_LENGTH msg-length)
  90       (let ((state (convert-from-foreign-string sql-state)))
  91         (free-foreign-object error-message)
  92         (free-foreign-object sql-state)
  93         state
  94         ;; test this: return a keyword for efficiency
  95         ;;(%cstring-to-keyword state)
  96         ))))
  97
  98 (defmacro with-error-handling ((&key henv hdbc hstmt (print-info t))
  99                                    odbc-call &body body)
 100   (let ((result-code (gensym "RC-")))
 101     `(let ((,result-code ,odbc-call))
 102
 103       ;; Check for allegro v7 & v8 bug with ODBC calls returning
 104       ;; 32-bit unsigned ints, not 16-bit signed ints
 105       #+(and allegro mswindows)
 106       (when (> ,result-code #xFFFF)
 107         (warn (format nil "16-bit return bug: result-code #x~X for expression ~S"
 108                       ,result-code (quote ,odbc-call)))
 109         (setq ,result-code (logand ,result-code #xFFFF))
 110         (when (> ,result-code #x7FFF)
 111           (setq ,result-code (- ,result-code #x10000))))
 112
 113        (case ,result-code
 114          (#.$SQL_SUCCESS
 115           (progn ,result-code ,@body))
 116          (#.$SQL_SUCCESS_WITH_INFO
 117           (when ,print-info
 118             (multiple-value-bind (error-message sql-state)
 119                 (handle-error (or ,henv +null-handle-ptr+)
 120                               (or ,hdbc +null-handle-ptr+)
 121                               (or ,hstmt +null-handle-ptr+))
 122               (when *info-output*
 123                 (format *info-output* "[ODBC info ~A] ~A state: ~A"
 124                         ,result-code error-message
 125                         sql-state))))
 126           (progn ,result-code ,@body))
 127          (#.$SQL_INVALID_HANDLE
 128           (error
 129            'clsql-sys:sql-database-error
 130            :message "ODBC: Invalid handle"))
 131          (#.$SQL_STILL_EXECUTING
 132           (error
 133            'clsql-sys:sql-temporary-error
 134            :message "ODBC: Still executing"))
 135          (#.$SQL_ERROR
 136           (multiple-value-bind (error-message sql-state)
 137               (handle-error (or ,henv +null-handle-ptr+)
 138                             (or ,hdbc +null-handle-ptr+)
 139                             (or ,hstmt +null-handle-ptr+))
 140             (error
 141              'clsql-sys:sql-database-error
 142              :message error-message
 143              :secondary-error-id sql-state)))
 144          (#.$SQL_NO_DATA_FOUND
 145           (progn ,result-code ,@body))
 146          ;; work-around for Allegro 7.0beta AMD64 which returns negative numbers
 147          (otherwise
 148           (multiple-value-bind (error-message sql-state)
 149               (handle-error (or ,henv +null-handle-ptr+)
 150                             (or ,hdbc +null-handle-ptr+)
 151                             (or ,hstmt +null-handle-ptr+))
 152             (error
 153              'clsql-sys:sql-database-error
 154              :message error-message
 155              :secondary-error-id sql-state))
 156           #+ignore
 157           (progn ,result-code ,@body))))))
 158
 159 (defun %new-environment-handle ()
 160   (let ((henv
 161          (with-foreign-object (phenv 'sql-handle)
 162            (with-error-handling
 163                ()
 164              (SQLAllocHandle $SQL_HANDLE_ENV +null-handle-ptr+ phenv)
 165              (deref-pointer phenv 'sql-handle)))))
 166     (%set-attr-odbc-version henv $SQL_OV_ODBC3)
 167     henv))
 168
 169
 170 (defun %sql-free-environment (henv)
 171   (with-error-handling
 172     (:henv henv)
 173     (SQLFreeEnv henv)))
 174
 175 (defun %new-db-connection-handle (henv)
 176   (with-foreign-object (phdbc 'sql-handle)
 177     (setf (deref-pointer phdbc 'sql-handle) +null-handle-ptr+)
 178     (with-error-handling
 179       (:henv henv)
 180       (SQLAllocHandle $SQL_HANDLE_DBC henv phdbc)
 181       (deref-pointer phdbc 'sql-handle))))
 182
 183 (defun %free-statement (hstmt option)
 184   (with-error-handling
 185       (:hstmt hstmt)
 186       (SQLFreeStmt
 187        hstmt
 188        (ecase option
 189          (:drop $SQL_DROP)
 190          (:close $SQL_CLOSE)
 191          (:unbind $SQL_UNBIND)
 192          (:reset $SQL_RESET_PARAMS)))))
 193
 194 (defmacro with-statement-handle ((hstmt hdbc) &body body)
 195   `(let ((,hstmt (%new-statement-handle ,hdbc)))
 196      (unwind-protect
 197        (progn ,@body)
 198        (%free-statement ,hstmt :drop))))
 199
 200 ;; functional interface
 201
 202 (defun %sql-connect (hdbc server uid pwd)
 203   (with-cstrings ((server-ptr server)
 204                   (uid-ptr uid)
 205                   (pwd-ptr pwd))
 206     (with-error-handling
 207         (:hdbc hdbc)
 208       (SQLConnect hdbc server-ptr $SQL_NTS uid-ptr
 209                   $SQL_NTS pwd-ptr $SQL_NTS))))
 210
 211 (defun %sql-driver-connect (hdbc connection-string completion window-handle)
 212   (with-cstring (connection-ptr connection-string)
 213     (let ((completed-connection-string (allocate-foreign-string $SQL_MAX_CONN_OUT)))
 214       (unwind-protect
 215           (with-foreign-object (completed-connection-length :short)
 216                                (with-error-handling
 217                                    (:hdbc hdbc)
 218                                    (SQLDriverConnect hdbc
 219                                                      window-handle
 220                                                      connection-ptr $SQL_NTS
 221                                                      completed-connection-string $SQL_MAX_CONN_OUT
 222                                                      completed-connection-length
 223                                                      completion)))
 224         (free-foreign-object completed-connection-string)))))
 225
 226 (defun %disconnect (hdbc)
 227   (with-error-handling
 228     (:hdbc hdbc)
 229     (SQLDisconnect hdbc)))
 230
 231 (defun %commit (henv hdbc)
 232   (with-error-handling
 233     (:henv henv :hdbc hdbc)
 234     (SQLTransact
 235      henv hdbc $SQL_COMMIT)))
 236
 237 (defun %rollback (henv hdbc)
 238   (with-error-handling
 239     (:henv henv :hdbc hdbc)
 240     (SQLTransact
 241      henv hdbc $SQL_ROLLBACK)))
 242
 243 ; col-nr is zero-based in Lisp but 1 based in sql
 244 ; col-nr = :bookmark retrieves a bookmark.
 245 (defun %bind-column (hstmt column-nr c-type data-ptr precision out-len-ptr)
 246   (with-error-handling
 247     (:hstmt hstmt)
 248     (SQLBindCol hstmt
 249                 (if (eq column-nr :bookmark) 0 (1+ column-nr))
 250                 c-type data-ptr precision out-len-ptr)))
 251
 252 ; parameter-nr is zero-based in Lisp
 253 (defun %sql-bind-parameter (hstmt parameter-nr parameter-type c-type
 254                                       sql-type precision scale data-ptr
 255                                       max-value out-len-ptr)
 256   (with-error-handling
 257     (:hstmt hstmt)
 258     (SQLBindParameter hstmt (1+ parameter-nr)
 259                       parameter-type ;$SQL_PARAM_INPUT
 260                       c-type ;$SQL_C_CHAR
 261                       sql-type ;$SQL_VARCHAR
 262                       precision ;(1- (length str))
 263                       scale ;0
 264                       data-ptr
 265                       max-value
 266                       out-len-ptr ;#.+null-ptr+
 267                       )))
 268
 269 (defun %sql-fetch (hstmt)
 270   (with-error-handling
 271       (:hstmt hstmt)
 272       (SQLFetch hstmt)))
 273
 274 (defun %new-statement-handle (hdbc)
 275   (let ((statement-handle
 276          (with-foreign-object (phstmt 'sql-handle)
 277            (with-error-handling
 278                (:hdbc hdbc)
 279              (SQLAllocHandle $SQL_HANDLE_STMT hdbc phstmt)
 280              (deref-pointer phstmt 'sql-handle)))))
 281     (if (uffi:null-pointer-p statement-handle)
 282         (error 'clsql:sql-database-error :message "Received null statement handle.")
 283         statement-handle)))
 284
 285 (defun %sql-get-info (hdbc info-type)
 286   (ecase info-type
 287     ;; those return string
 288     ((#.$SQL_ACCESSIBLE_PROCEDURES
 289       #.$SQL_ACCESSIBLE_TABLES
 290       #.$SQL_COLUMN_ALIAS
 291       #.$SQL_DATA_SOURCE_NAME
 292       #.$SQL_DATA_SOURCE_READ_ONLY
 293       #.$SQL_DBMS_NAME
 294       #.$SQL_DBMS_VER
 295       #.$SQL_DRIVER_NAME
 296       #.$SQL_DRIVER_ODBC_VER
 297       #.$SQL_DRIVER_VER
 298       #.$SQL_EXPRESSIONS_IN_ORDERBY
 299       #.$SQL_IDENTIFIER_QUOTE_CHAR
 300       #.$SQL_KEYWORDS
 301       #.$SQL_LIKE_ESCAPE_CLAUSE
 302       #.$SQL_MAX_ROW_SIZE_INCLUDES_LONG
 303       #.$SQL_MULT_RESULT_SETS
 304       #.$SQL_MULTIPLE_ACTIVE_TXN
 305       #.$SQL_NEED_LONG_DATA_LEN
 306       #.$SQL_ODBC_SQL_OPT_IEF
 307       #.$SQL_ODBC_VER
 308       #.$SQL_ORDER_BY_COLUMNS_IN_SELECT
 309       #.$SQL_OUTER_JOINS
 310       #.$SQL_OWNER_TERM
 311       #.$SQL_PROCEDURE_TERM
 312       #.$SQL_PROCEDURES
 313       #.$SQL_QUALIFIER_NAME_SEPARATOR
 314       #.$SQL_QUALIFIER_TERM
 315       #.$SQL_ROW_UPDATES
 316       #.$SQL_SEARCH_PATTERN_ESCAPE
 317       #.$SQL_SERVER_NAME
 318       #.$SQL_SPECIAL_CHARACTERS
 319       #.$SQL_TABLE_TERM
 320       #.$SQL_USER_NAME)
 321      (let ((info-ptr (allocate-foreign-string 1024)))
 322        (with-foreign-object (info-length-ptr :short)
 323          (with-error-handling
 324              (:hdbc hdbc)
 325              (SQLGetInfo hdbc info-type info-ptr 1023 info-length-ptr)
 326            (let ((info (convert-from-foreign-string info-ptr)))
 327              (free-foreign-object info-ptr)
 328              info)))))
 329     ;; those returning a word
 330     ((#.$SQL_ACTIVE_CONNECTIONS
 331       #.$SQL_ACTIVE_STATEMENTS
 332       #.$SQL_CONCAT_NULL_BEHAVIOR
 333       #.$SQL_CORRELATION_NAME
 334       #.$SQL_CURSOR_COMMIT_BEHAVIOR
 335       #.$SQL_CURSOR_ROLLBACK_BEHAVIOR
 336       #.$SQL_MAX_COLUMN_NAME_LEN
 337       #.$SQL_MAX_COLUMNS_IN_GROUP_BY
 338       #.$SQL_MAX_COLUMNS_IN_INDEX
 339       #.$SQL_MAX_COLUMNS_IN_ORDER_BY
 340       #.$SQL_MAX_COLUMNS_IN_SELECT
 341       #.$SQL_MAX_COLUMNS_IN_TABLE
 342       #.$SQL_MAX_CURSOR_NAME_LEN
 343       #.$SQL_MAX_OWNER_NAME_LEN
 344       #.$SQL_MAX_PROCEDURE_NAME_LEN
 345       #.$SQL_MAX_QUALIFIER_NAME_LEN
 346       #.$SQL_MAX_TABLE_NAME_LEN
 347       #.$SQL_MAX_TABLES_IN_SELECT
 348       #.$SQL_MAX_USER_NAME_LEN
 349       #.$SQL_NON_NULLABLE_COLUMNS
 350       #.$SQL_NULL_COLLATION
 351       #.$SQL_ODBC_API_CONFORMANCE
 352       #.$SQL_ODBC_SAG_CLI_CONFORMANCE
 353       #.$SQL_ODBC_SQL_CONFORMANCE
 354       #.$SQL_QUALIFIER_LOCATION
 355       #.$SQL_QUOTED_IDENTIFIER_CASE
 356       #.$SQL_TXN_CAPABLE)
 357      (with-foreign-objects ((info-ptr :short)
 358                             (info-length-ptr :short))
 359        (with-error-handling
 360         (:hdbc hdbc)
 361          (SQLGetInfo hdbc
 362                      info-type
 363                      info-ptr
 364                      255
 365                      info-length-ptr)
 366          (deref-pointer info-ptr :short)))
 367      )
 368     ;; those returning a long bitmask
 369     ((#.$SQL_ALTER_TABLE
 370       #.$SQL_BOOKMARK_PERSISTENCE
 371       #.$SQL_CONVERT_BIGINT
 372       #.$SQL_CONVERT_BINARY
 373       #.$SQL_CONVERT_BIT
 374       #.$SQL_CONVERT_CHAR
 375       #.$SQL_CONVERT_DATE
 376       #.$SQL_CONVERT_DECIMAL
 377       #.$SQL_CONVERT_DOUBLE
 378       #.$SQL_CONVERT_FLOAT
 379       #.$SQL_CONVERT_INTEGER
 380       #.$SQL_CONVERT_LONGVARCHAR
 381       #.$SQL_CONVERT_NUMERIC
 382       #.$SQL_CONVERT_REAL
 383       #.$SQL_CONVERT_SMALLINT
 384       #.$SQL_CONVERT_TIME
 385       #.$SQL_CONVERT_TIMESTAMP
 386       #.$SQL_CONVERT_TINYINT
 387       #.$SQL_CONVERT_VARBINARY
 388       #.$SQL_CONVERT_VARCHAR
 389       #.$SQL_CONVERT_LONGVARBINARY
 390       #.$SQL_CONVERT_FUNCTIONS
 391       #.$SQL_FETCH_DIRECTION
 392       #.$SQL_FILE_USAGE
 393       #.$SQL_GETDATA_EXTENSIONS
 394       #.$SQL_LOCK_TYPES
 395       #.$SQL_MAX_INDEX_SIZE
 396       #.$SQL_MAX_ROW_SIZE
 397       #.$SQL_MAX_STATEMENT_LEN
 398       #.$SQL_NUMERIC_FUNCTIONS
 399       #.$SQL_OWNER_USAGE
 400       #.$SQL_POS_OPERATIONS
 401       #.$SQL_POSITIONED_STATEMENTS
 402       #.$SQL_QUALIFIER_USAGE
 403       #.$SQL_SCROLL_CONCURRENCY
 404       #.$SQL_SCROLL_OPTIONS
 405       #.$SQL_STATIC_SENSITIVITY
 406       #.$SQL_STRING_FUNCTIONS
 407       #.$SQL_SUBQUERIES
 408       #.$SQL_SYSTEM_FUNCTIONS
 409       #.$SQL_TIMEDATE_ADD_INTERVALS
 410       #.$SQL_TIMEDATE_DIFF_INTERVALS
 411       #.$SQL_TIMEDATE_FUNCTIONS
 412       #.$SQL_TXN_ISOLATION_OPTION
 413       #.$SQL_UNION)
 414      (with-foreign-objects ((info-ptr #.$ODBC-LONG-TYPE)
 415                             (info-length-ptr :short))
 416        (with-error-handling
 417          (:hdbc hdbc)
 418          (SQLGetInfo hdbc
 419                      info-type
 420                      info-ptr
 421                      255
 422                      info-length-ptr)
 423          (deref-pointer info-ptr #.$ODBC-LONG-TYPE)))
 424      )
 425     ;; those returning a long integer
 426     ((#.$SQL_DEFAULT_TXN_ISOLATION
 427       #.$SQL_DRIVER_HDBC
 428       #.$SQL_DRIVER_HENV
 429       #.$SQL_DRIVER_HLIB
 430       #.$SQL_DRIVER_HSTMT
 431       #.$SQL_GROUP_BY
 432       #.$SQL_IDENTIFIER_CASE
 433       #.$SQL_MAX_BINARY_LITERAL_LEN
 434       #.$SQL_MAX_CHAR_LITERAL_LEN
 435       #.$SQL_ACTIVE_ENVIRONMENTS
 436       )
 437      (with-foreign-objects ((info-ptr #.$ODBC-LONG-TYPE)
 438                             (info-length-ptr :short))
 439        (with-error-handling
 440          (:hdbc hdbc)
 441          (SQLGetInfo hdbc info-type info-ptr 255 info-length-ptr)
 442          (deref-pointer info-ptr #.$ODBC-LONG-TYPE))))))
 443
 444 (defun %sql-exec-direct (sql hstmt henv hdbc)
 445   (with-cstring (sql-ptr sql)
 446     (with-error-handling
 447       (:hstmt hstmt :henv henv :hdbc hdbc)
 448       (SQLExecDirect hstmt sql-ptr $SQL_NTS))))
 449
 450 (defun %sql-cancel (hstmt)
 451   (with-error-handling
 452     (:hstmt hstmt)
 453     (SQLCancel hstmt)))
 454
 455 (defun %sql-execute (hstmt)
 456   (with-error-handling
 457     (:hstmt hstmt)
 458     (SQLExecute hstmt)))
 459
 460 (defun result-columns-count (hstmt)
 461   (with-foreign-objects ((columns-nr-ptr :short))
 462     (with-error-handling (:hstmt hstmt)
 463                          (SQLNumResultCols hstmt columns-nr-ptr)
 464       (deref-pointer columns-nr-ptr :short))))
 465
 466 (defun result-rows-count (hstmt)
 467   (with-foreign-objects ((row-count-ptr #.$ODBC-LONG-TYPE))
 468     (with-error-handling (:hstmt hstmt)
 469                          (SQLRowCount hstmt row-count-ptr)
 470       (deref-pointer row-count-ptr #.$ODBC-LONG-TYPE))))
 471
 472 ;; column counting is 1-based
 473 (defun %describe-column (hstmt column-nr)
 474   (let ((column-name-ptr (allocate-foreign-string 256)))
 475     (with-foreign-objects ((column-name-length-ptr :short)
 476                            (column-sql-type-ptr :short)
 477                            (column-precision-ptr #.$ODBC-ULONG-TYPE)
 478                            (column-scale-ptr :short)
 479                            (column-nullable-p-ptr :short))
 480       (with-error-handling (:hstmt hstmt)
 481           (SQLDescribeCol hstmt column-nr column-name-ptr 256
 482                           column-name-length-ptr
 483                           column-sql-type-ptr
 484                           column-precision-ptr
 485                           column-scale-ptr
 486                           column-nullable-p-ptr)
 487         (let ((column-name (convert-from-foreign-string column-name-ptr)))
 488           (free-foreign-object column-name-ptr)
 489           (values
 490            column-name
 491            (deref-pointer column-sql-type-ptr :short)
 492            (deref-pointer column-precision-ptr #.$ODBC-ULONG-TYPE)
 493            (deref-pointer column-scale-ptr :short)
 494            (deref-pointer column-nullable-p-ptr :short)))))))
 495
 496 ;; this function isn't used, which is good because FreeTDS dosn't support it.
 497 ;; parameter counting is 1-based
 498 (defun %describe-parameter (hstmt parameter-nr)
 499   (with-foreign-objects ((column-sql-type-ptr :short)
 500                          (column-precision-ptr #.$ODBC-ULONG-TYPE)
 501                          (column-scale-ptr :short)
 502                          (column-nullable-p-ptr :short))
 503     (with-error-handling
 504       (:hstmt hstmt)
 505       (SQLDescribeParam hstmt parameter-nr
 506                         column-sql-type-ptr
 507                         column-precision-ptr
 508                         column-scale-ptr
 509                         column-nullable-p-ptr)
 510       (values
 511        (deref-pointer column-sql-type-ptr :short)
 512        (deref-pointer column-precision-ptr #.$ODBC-ULONG-TYPE)
 513        (deref-pointer column-scale-ptr :short)
 514        (deref-pointer column-nullable-p-ptr :short)))))
 515
 516 (defun %column-attributes (hstmt column-nr descriptor-type)
 517   (let ((descriptor-info-ptr (allocate-foreign-string 256)))
 518     (with-foreign-objects ((descriptor-length-ptr :short)
 519                            (numeric-descriptor-ptr #.$ODBC-LONG-TYPE))
 520       (with-error-handling
 521           (:hstmt hstmt)
 522           (SQLColAttributes hstmt column-nr descriptor-type descriptor-info-ptr
 523                             256 descriptor-length-ptr
 524                             numeric-descriptor-ptr)
 525         (let ((desc (convert-from-foreign-string descriptor-info-ptr)))
 526           (free-foreign-object descriptor-info-ptr)
 527           (values
 528            desc
 529            (deref-pointer numeric-descriptor-ptr #.$ODBC-LONG-TYPE)))))))
 530
 531 (defun %prepare-describe-columns (hstmt table-qualifier table-owner
 532                                    table-name column-name)
 533   (with-cstrings ((table-qualifier-ptr table-qualifier)
 534                   (table-owner-ptr table-owner)
 535                   (table-name-ptr table-name)
 536                   (column-name-ptr column-name))
 537     (with-error-handling
 538         (:hstmt hstmt)
 539       (SQLColumns hstmt
 540                   table-qualifier-ptr (length table-qualifier)
 541                   table-owner-ptr (length table-owner)
 542                   table-name-ptr (length table-name)
 543                   column-name-ptr (length column-name)))))
 544
 545 (defun %describe-columns (hdbc table-qualifier table-owner
 546                           table-name column-name)
 547   (with-statement-handle (hstmt hdbc)
 548     (%prepare-describe-columns hstmt table-qualifier table-owner
 549                                table-name column-name)
 550     (fetch-all-rows hstmt)))
 551
 552 (defun %sql-data-sources (henv &key (direction :first))
 553   (let ((name-ptr (allocate-foreign-string (1+ $SQL_MAX_DSN_LENGTH)))
 554         (description-ptr (allocate-foreign-string 1024)))
 555     (with-foreign-objects ((name-length-ptr :short)
 556                            (description-length-ptr :short))
 557       (let ((res (with-error-handling
 558                      (:henv henv)
 559                      (SQLDataSources henv
 560                                      (ecase direction
 561                                        (:first $SQL_FETCH_FIRST)
 562                                        (:next $SQL_FETCH_NEXT))
 563                                      name-ptr
 564                                      (1+ $SQL_MAX_DSN_LENGTH)
 565                                      name-length-ptr
 566                                      description-ptr
 567                                      1024
 568                                      description-length-ptr))))
 569         (cond
 570           ((= res $SQL_NO_DATA_FOUND)
 571            (let ((name (convert-from-foreign-string name-ptr))
 572                  (desc (convert-from-foreign-string description-ptr)))
 573              (free-foreign-object name-ptr)
 574              (free-foreign-object description-ptr)
 575              (values
 576               name
 577               desc)))
 578           (t
 579            (free-foreign-object name-ptr)
 580            (free-foreign-object description-ptr)
 581            nil))))))
 582
 583
 584
 585 (defun sql-to-c-type (sql-type)
 586   (ecase sql-type
 587     ((#.$SQL_CHAR #.$SQL_VARCHAR #.$SQL_LONGVARCHAR
 588       #.$SQL_NUMERIC #.$SQL_DECIMAL -8 -9 -10) $SQL_C_CHAR) ;; Added -10 for MSSQL ntext type
 589     (#.$SQL_INTEGER $SQL_C_SLONG)
 590     (#.$SQL_SMALLINT $SQL_C_SSHORT)
 591     (#.$SQL_BIGINT $SQL_C_SBIGINT)
 592     (#.$SQL_DOUBLE $SQL_C_DOUBLE)
 593     (#.$SQL_FLOAT $SQL_C_DOUBLE)
 594     (#.$SQL_REAL $SQL_C_FLOAT)
 595     (#.$SQL_DATE $SQL_C_DATE)
 596     (#.$SQL_TIME $SQL_C_TIME)
 597     (#.$SQL_TIMESTAMP $SQL_C_TIMESTAMP)
 598     (#.$SQL_TYPE_DATE $SQL_C_TYPE_DATE)
 599     (#.$SQL_TYPE_TIME $SQL_C_TYPE_TIME)
 600     (#.$SQL_TYPE_TIMESTAMP $SQL_C_TYPE_TIMESTAMP)
 601     ((#.$SQL_BINARY #.$SQL_VARBINARY #.$SQL_LONGVARBINARY) $SQL_C_BINARY)
 602     (#.$SQL_TINYINT $SQL_C_STINYINT)
 603     (#.$SQL_BIT $SQL_C_BIT)))
 604
 605 (def-type byte-pointer-type (* :byte))
 606 (def-type short-pointer-type (* :short))
 607 (def-type int-pointer-type (* :int))
 608 (def-type long-pointer-type (* #.$ODBC-LONG-TYPE))
 609 (def-type big-pointer-type (* #.$ODBC-BIG-TYPE))
 610 (def-type float-pointer-type (* :float))
 611 (def-type double-pointer-type (* :double))
 612 (def-type string-pointer-type (* :unsigned-char))
 613
 614 (defun get-cast-byte (ptr)
 615   (locally (declare (type byte-pointer-type ptr))
 616     (deref-pointer ptr :byte)))
 617
 618 (defun get-cast-short (ptr)
 619   (locally (declare (type short-pointer-type ptr))
 620     (deref-pointer ptr :short)))
 621
 622 (defun get-cast-int (ptr)
 623   (locally (declare (type int-pointer-type ptr))
 624     (deref-pointer ptr :int)))
 625
 626 (defun get-cast-long (ptr)
 627   (locally (declare (type long-pointer-type ptr))
 628     (deref-pointer ptr #.$ODBC-LONG-TYPE)))
 629
 630 (defun get-cast-big (ptr)
 631   (locally (declare (type big-pointer-type ptr))
 632     (deref-pointer ptr #.$ODBC-BIG-TYPE)))
 633
 634 (defun get-cast-single-float (ptr)
 635   (locally (declare (type float-pointer-type ptr))
 636     (deref-pointer ptr :float)))
 637
 638 (defun get-cast-double-float (ptr)
 639   (locally (declare (type double-pointer-type ptr))
 640     (deref-pointer ptr :double)))
 641
 642 (defun get-cast-foreign-string (ptr)
 643   (locally (declare (type string-pointer-type ptr))
 644     (convert-from-foreign-string ptr)))
 645
 646 (defun get-cast-binary (ptr len format)
 647   "FORMAT is one of :unsigned-byte-vector, :bit-vector (:string, :hex-string)"
 648   (with-cast-pointer (casted ptr :byte)
 649     (ecase format
 650       (:unsigned-byte-vector
 651        (let ((vector (make-array len :element-type '(unsigned-byte 8))))
 652          (dotimes (i len)
 653            (setf (aref vector i)
 654                  (deref-array casted '(:array :byte) i)))
 655          vector))
 656       (:bit-vector
 657        (let ((vector (make-array (ash len 3) :element-type 'bit)))
 658          (dotimes (i len)
 659            (let ((byte (deref-array casted '(:array :byte) i)))
 660              (dotimes (j 8)
 661                (setf (bit vector (+ (ash i 3) j))
 662                      (logand (ash byte (- j 7)) 1)))))
 663          vector)))))
 664
 665
 666 (defun read-data (data-ptr c-type sql-type out-len-ptr result-type)
 667   (declare (type long-ptr-type out-len-ptr))
 668   (let* ((out-len (deref-pointer out-len-ptr #.$ODBC-LONG-TYPE))
 669          (value
 670           (cond ((= out-len $SQL_NULL_DATA)
 671                  *null*)
 672                 (t
 673                  (case sql-type
 674                    ;; SQL extended datatypes
 675                    (#.$SQL_TINYINT  (get-cast-byte data-ptr))
 676                    (#.$SQL_C_STINYINT (get-cast-byte data-ptr)) ;; ?
 677                    (#.$SQL_C_SSHORT (get-cast-short data-ptr)) ;; ?
 678                    (#.$SQL_SMALLINT (get-cast-short data-ptr)) ;; ??
 679                    (#.$SQL_INTEGER (get-cast-int data-ptr))
 680                    (#.$SQL_BIGINT (get-cast-big data-ptr))
 681                    ((#.$SQL_DECIMAL #.$SQL_NUMERIC)
 682                       (let* ((*read-base* 10)
 683                              (*read-default-float-format* 'double-float)
 684                              (str (get-cast-foreign-string data-ptr)))
 685                         (read-from-string str)))
 686                    (#.$SQL_BIT (get-cast-byte data-ptr))
 687                    (t
 688                     (case c-type
 689                       ((#.$SQL_C_DATE #.$SQL_C_TYPE_DATE)
 690                        (funcall *time-conversion-function* (date-to-universal-time data-ptr)))
 691                       ((#.$SQL_C_TIME #.$SQL_C_TYPE_TIME)
 692                        (multiple-value-bind (universal-time frac) (time-to-universal-time data-ptr)
 693                          (funcall *time-conversion-function* universal-time frac)))
 694                       ((#.$SQL_C_TIMESTAMP #.$SQL_C_TYPE_TIMESTAMP)
 695                        (multiple-value-bind (universal-time frac) (timestamp-to-universal-time data-ptr)
 696                          (funcall *time-conversion-function* universal-time frac)))
 697                       (#.$SQL_INTEGER
 698                        (get-cast-int data-ptr))
 699                       (#.$SQL_C_FLOAT
 700                        (get-cast-single-float data-ptr))
 701                       (#.$SQL_C_DOUBLE
 702                        (get-cast-double-float data-ptr))
 703                       (#.$SQL_C_SLONG
 704                        (get-cast-long data-ptr))
 705                       #+lispworks
 706                       (#.$SQL_C_BIT     ; encountered only in Access
 707                        (get-cast-byte data-ptr))
 708                       (#.$SQL_C_BINARY
 709                        (get-cast-binary data-ptr out-len *binary-format*))
 710                       ((#.$SQL_C_SSHORT #.$SQL_C_STINYINT) ; LMH short ints
 711                        (get-cast-short data-ptr)) ; LMH
 712                       #+ignore
 713                       (#.$SQL_C_CHAR
 714                        (code-char (get-cast-short data-ptr)))
 715                       (t
 716                        (get-cast-foreign-string data-ptr)))))))))
 717
 718     ;; FIXME: this could be better optimized for types which use READ-FROM-STRING above
 719
 720     (if (and (or (eq result-type t) (eq result-type :string))
 721              value
 722              (not (stringp value)))
 723         (write-to-string value)
 724       value)))
 725
 726 ;; which value is appropriate?
 727 (defparameter +max-precision+  4001)
 728
 729 (defvar *break-on-unknown-data-type* t)
 730
 731 ;; C. Stacy's idea to factor this out
 732 ;; "Make it easy to add new datatypes by making new subroutine %ALLOCATE-BINDINGS,
 733 ;; so that I don't have to remember to make changes in more than one place.
 734 ;; Just keep it in synch with READ-DATA."
 735 (defun %allocate-bindings (sql-type precision)
 736   (let* ((c-type (sql-to-c-type sql-type))
 737          (size (if (zerop precision)
 738                    +max-precision+ ;; if the precision cannot be determined
 739                  (min precision +max-precision+)))
 740          (long-p (= size +max-precision+))
 741          (data-ptr
 742           (case c-type ;; add more?
 743             (#.$SQL_C_SLONG (uffi:allocate-foreign-object #.$ODBC-LONG-TYPE))
 744             ((#.$SQL_C_DATE #.$SQL_C_TYPE_DATE) (allocate-foreign-object 'sql-c-date))
 745             ((#.$SQL_C_TIME #.$SQL_C_TYPE_TIME) (allocate-foreign-object 'sql-c-time))
 746             ((#.$SQL_C_TIMESTAMP #.$SQL_C_TYPE_TIMESTAMP) (allocate-foreign-object 'sql-c-timestamp))
 747             (#.$SQL_C_FLOAT (uffi:allocate-foreign-object :float))
 748             (#.$SQL_C_DOUBLE (uffi:allocate-foreign-object :double))
 749             (#.$SQL_C_BIT (uffi:allocate-foreign-object :byte))
 750             (#.$SQL_C_STINYINT (uffi:allocate-foreign-object :byte))
 751             (#.$SQL_C_SSHORT (uffi:allocate-foreign-object :short))
 752             (#.$SQL_C_SBIGINT (uffi:allocate-foreign-object #.$ODBC-BIG-TYPE))
 753             (#.$SQL_C_CHAR (uffi:allocate-foreign-string (1+ size)))
 754             (#.$SQL_C_BINARY (uffi:allocate-foreign-string (1+ (* 2 size))))
 755             (t
 756                 ;; Maybe should signal a restartable condition for this?
 757                 (when *break-on-unknown-data-type*
 758                   (break "SQL type is ~A, precision ~D, size ~D, C type is ~A"
 759                          sql-type precision size c-type))
 760                 (uffi:allocate-foreign-object :byte (1+ size)))))
 761          (out-len-ptr (uffi:allocate-foreign-object #.$ODBC-LONG-TYPE)))
 762     (values c-type data-ptr out-len-ptr size long-p)))
 763
 764 (defun fetch-all-rows (hstmt &key free-option flatp)
 765   (let ((column-count (result-columns-count hstmt)))
 766     (unless (zerop column-count)
 767       (let ((names (make-array column-count))
 768             (sql-types (make-array column-count :element-type 'fixnum))
 769             (c-types (make-array column-count :element-type 'fixnum))
 770             (precisions (make-array column-count :element-type 'fixnum))
 771             (data-ptrs (make-array column-count :initial-element nil))
 772             (out-len-ptrs (make-array column-count :initial-element nil))
 773             (scales (make-array column-count :element-type 'fixnum))
 774             (nullables-p (make-array column-count :element-type 'fixnum)))
 775         (unwind-protect
 776           (values
 777            (progn
 778              (dotimes (col-nr column-count)
 779                ;; get column information
 780                (multiple-value-bind (name sql-type precision scale nullable-p)
 781                                     (%describe-column hstmt (1+ col-nr))
 782                  ;; allocate space to bind result rows to
 783                  (multiple-value-bind (c-type data-ptr out-len-ptr)
 784                      (%allocate-bindings sql-type precision)
 785                    (%bind-column hstmt col-nr c-type data-ptr (1+ precision) out-len-ptr)
 786                    (setf (svref names col-nr) name
 787                          (aref sql-types col-nr) sql-type
 788                          (aref c-types col-nr) (sql-to-c-type sql-type)
 789                          (aref precisions col-nr) (if (zerop precision) 0 precision)
 790                          (aref scales col-nr) scale
 791                          (aref nullables-p col-nr) nullable-p
 792                          (aref data-ptrs col-nr) data-ptr
 793                          (aref out-len-ptrs col-nr) out-len-ptr))))
 794              ;; the main loop
 795              (prog1
 796                (cond (flatp
 797                       (when (> column-count 1)
 798                         (error 'clsql:sql-database-error
 799                                :message "If more than one column is to be fetched, flatp has to be nil."))
 800                       (loop until (= (%sql-fetch hstmt) $SQL_NO_DATA_FOUND)
 801                             collect
 802                             (read-data (aref data-ptrs 0)
 803                                        (aref c-types 0)
 804                                        (aref sql-types 0)
 805                                        (aref out-len-ptrs 0)
 806                                        t)))
 807                      (t
 808                       (loop until (= (%sql-fetch hstmt) $SQL_NO_DATA_FOUND)
 809                             collect
 810                             (loop for col-nr from 0 to (1- column-count)
 811                                   collect
 812                                   (read-data (aref data-ptrs col-nr)
 813                                              (aref c-types col-nr)
 814                                              (aref sql-types col-nr)
 815                                              (aref out-len-ptrs col-nr)
 816                                              t)))))))
 817            names)
 818           ;; dispose of memory etc
 819           (when free-option (%free-statement hstmt free-option))
 820           (dotimes (col-nr column-count)
 821             (let ((data-ptr (aref data-ptrs col-nr))
 822                   (out-len-ptr (aref out-len-ptrs col-nr)))
 823               (when data-ptr (free-foreign-object data-ptr)) ; we *did* allocate them
 824               (when out-len-ptr (free-foreign-object out-len-ptr)))))))))
 825
 826 ;; to do: factor out common parts, put the sceleton (the obligatory macro part)
 827 ;; of %do-fetch into sql package (has been done)
 828
 829 (defun %sql-prepare (hstmt sql)
 830   (with-cstring (sql-ptr sql)
 831     (with-error-handling (:hstmt hstmt)
 832       (SQLPrepare hstmt sql-ptr $SQL_NTS))))
 833
 834 ;; depending on option, we return a long int or a string; string not implemented
 835 (defun get-connection-option (hdbc option)
 836   (with-foreign-object (param-ptr #.$ODBC-LONG-TYPE)
 837     (with-error-handling (:hdbc hdbc)
 838                          (SQLGetConnectOption hdbc option param-ptr)
 839       (deref-pointer param-ptr #.$ODBC-LONG-TYPE))))
 840
 841 (defun set-connection-option (hdbc option param)
 842   (with-error-handling (:hdbc hdbc)
 843     (SQLSetConnectOption hdbc option param)))
 844
 845 (defun disable-autocommit (hdbc)
 846   (set-connection-option hdbc $SQL_AUTOCOMMIT $SQL_AUTOCOMMIT_OFF))
 847
 848 (defun enable-autocommit (hdbc)
 849   (set-connection-option hdbc $SQL_AUTOCOMMIT $SQL_AUTOCOMMIT_ON))
 850
 851 (defun %sql-set-pos (hstmt row option lock)
 852   (with-error-handling
 853     (:hstmt hstmt)
 854     (SQLSetPos hstmt row option lock)))
 855
 856 (defun %sql-extended-fetch (hstmt fetch-type row)
 857   (with-foreign-objects ((row-count-ptr #.$ODBC-ULONG-TYPE)
 858                          (row-status-ptr :short))
 859     (with-error-handling (:hstmt hstmt)
 860       (SQLExtendedFetch hstmt fetch-type row row-count-ptr
 861                         row-status-ptr)
 862       (values (deref-pointer row-count-ptr #.$ODBC-ULONG-TYPE)
 863               (deref-pointer row-status-ptr :short)))))
 864
 865 ; column-nr is zero-based
 866 (defun %sql-get-data (hstmt column-nr c-type data-ptr precision out-len-ptr)
 867   (with-error-handling
 868     (:hstmt hstmt :print-info nil)
 869     (SQLGetData hstmt (if (eq column-nr :bookmark) 0 (1+ column-nr))
 870                 c-type data-ptr precision out-len-ptr)))
 871
 872 (defun %sql-param-data (hstmt param-ptr)
 873   (with-error-handling (:hstmt hstmt :print-info t) ;; nil
 874       (SQLParamData hstmt param-ptr)))
 875
 876 (defun %sql-put-data (hstmt data-ptr size)
 877   (with-error-handling
 878     (:hstmt hstmt :print-info t) ;; nil
 879     (SQLPutData hstmt data-ptr size)))
 880
 881 (defconstant $sql-data-truncated (intern "01004" :keyword))
 882
 883 (defun read-data-in-chunks (hstmt column-nr data-ptr c-type sql-type
 884                                       out-len-ptr result-type)
 885   (declare (type long-ptr-type out-len-ptr)
 886            (ignore result-type))
 887   (let* ((res (%sql-get-data hstmt column-nr c-type data-ptr
 888                              +max-precision+ out-len-ptr))
 889          (out-len (deref-pointer out-len-ptr #.$ODBC-LONG-TYPE))
 890          (offset 0)
 891          (result (case out-len
 892                    (#.$SQL_NULL_DATA
 893                     (return-from read-data-in-chunks *null*))
 894                    (#.$SQL_NO_TOTAL ;; don't know how long it is going to be
 895                                     (let ((str (make-array 0 :element-type 'character :adjustable t)))
 896                                       (loop do (if (= c-type #.$SQL_CHAR)
 897                                                    (let ((data-length (foreign-string-length data-ptr)))
 898                                                      (adjust-array str (+ offset data-length)
 899                                                                    :initial-element #\?)
 900                                                      (setf offset (%cstring-into-vector
 901                                                                    data-ptr str
 902                                                                    offset
 903                                                                    data-length)))
 904                                                  (error 'clsql:sql-database-error :message "wrong type. preliminary."))
 905                                             while (and (= res $SQL_SUCCESS_WITH_INFO)
 906                                                        (equal (sql-state +null-handle-ptr+ +null-handle-ptr+ hstmt)
 907                                                               "01004"))
 908                                             do (setf res (%sql-get-data hstmt column-nr c-type data-ptr
 909                                                                         +max-precision+ out-len-ptr)))
 910                                       (setf str (coerce str 'string))
 911                                       (if (= sql-type $SQL_DECIMAL)
 912                                           (let ((*read-base* 10))
 913                                             (read-from-string str))
 914                                         str)))
 915                    (otherwise
 916                     (let ((str (make-string out-len)))
 917                       (loop do (if (= c-type #.$SQL_CHAR)
 918                                    (setf offset (%cstring-into-vector ;string
 919                                                  data-ptr str
 920                                                  offset
 921                                                  (min out-len (1- +max-precision+))))
 922                                  (error 'clsql:sql-database-error :message "wrong type. preliminary."))
 923                             while
 924                             (and (= res $SQL_SUCCESS_WITH_INFO)
 925                                  (> out-len +max-precision+))
 926                             do (setf res (%sql-get-data hstmt column-nr c-type data-ptr
 927                                                         +max-precision+ out-len-ptr)
 928                                      out-len (deref-pointer out-len-ptr #.$ODBC-LONG-TYPE)))
 929                       (if (= sql-type $SQL_DECIMAL)
 930                           (let ((*read-base* 10))
 931                             (read-from-string str))
 932                         str))))))
 933     (setf (deref-pointer out-len-ptr #.$ODBC-LONG-TYPE) #.$SQL_NO_TOTAL) ;; reset the out length for the next row
 934     result))
 935
 936 (def-type c-timestamp-ptr-type (* (:struct sql-c-timestamp)))
 937 (def-type c-time-ptr-type (* (:struct sql-c-time)))
 938 (def-type c-date-ptr-type (* (:struct sql-c-date)))
 939
 940 (defun timestamp-to-universal-time (ptr)
 941   (declare (type c-timestamp-ptr-type ptr))
 942   (values
 943    (encode-universal-time
 944     (get-slot-value ptr 'sql-c-timestamp 'second)
 945     (get-slot-value ptr 'sql-c-timestamp 'minute)
 946     (get-slot-value ptr 'sql-c-timestamp 'hour)
 947     (get-slot-value ptr 'sql-c-timestamp 'day)
 948     (get-slot-value ptr 'sql-c-timestamp 'month)
 949     (get-slot-value ptr 'sql-c-timestamp 'year))
 950    (get-slot-value ptr 'sql-c-timestamp 'fraction)))
 951
 952 (defun universal-time-to-timestamp (time &optional (fraction 0))
 953   (multiple-value-bind (sec min hour day month year)
 954       (decode-universal-time time)
 955     (let ((ptr (allocate-foreign-object 'sql-c-timestamp)))
 956       (setf (get-slot-value ptr 'sql-c-timestamp 'second) sec
 957             (get-slot-value ptr 'sql-c-timestamp 'minute) min
 958             (get-slot-value ptr 'sql-c-timestamp 'hour) hour
 959             (get-slot-value ptr 'sql-c-timestamp 'day) day
 960             (get-slot-value ptr 'sql-c-timestamp 'month) month
 961             (get-slot-value ptr 'sql-c-timestamp 'year) year
 962             (get-slot-value ptr 'sql-c-timestamp 'fraction) fraction)
 963       ptr)))
 964
 965 (defun %put-timestamp (ptr time &optional (fraction 0))
 966   (declare (type c-timestamp-ptr-type ptr))
 967   (multiple-value-bind (sec min hour day month year)
 968       (decode-universal-time time)
 969     (setf (get-slot-value ptr 'sql-c-timestamp 'second) sec
 970           (get-slot-value ptr 'sql-c-timestamp 'minute) min
 971           (get-slot-value ptr 'sql-c-timestamp 'hour) hour
 972           (get-slot-value ptr 'sql-c-timestamp 'day) day
 973           (get-slot-value ptr 'sql-c-timestamp 'month) month
 974           (get-slot-value ptr 'sql-c-timestamp 'year) year
 975           (get-slot-value ptr 'sql-c-timestamp 'fraction) fraction)
 976       ptr))
 977
 978 (defun date-to-universal-time (ptr)
 979   (declare (type c-date-ptr-type ptr))
 980   (encode-universal-time
 981    0 0 0
 982    (get-slot-value ptr 'sql-c-timestamp 'day)
 983    (get-slot-value ptr 'sql-c-timestamp 'month)
 984    (get-slot-value ptr 'sql-c-timestamp 'year)))
 985
 986 (defun time-to-universal-time (ptr)
 987   (declare (type c-time-ptr-type ptr))
 988   (encode-universal-time
 989    (get-slot-value ptr 'sql-c-timestamp 'second)
 990    (get-slot-value ptr 'sql-c-timestamp 'minute)
 991    (get-slot-value ptr 'sql-c-timestamp 'hour)
 992    1 1 0))
 993
 994
 995 ;;; Added by KMR
 996
 997 (defun %set-attr-odbc-version (henv version)
 998   (with-error-handling (:henv henv)
 999       (SQLSetEnvAttr henv $SQL_ATTR_ODBC_VERSION
1000                      (make-pointer version :void) 0)))
1001
1002 (defun %list-tables (hstmt)
1003   (with-error-handling (:hstmt hstmt)
1004     (SQLTables hstmt +null-ptr+ 0 +null-ptr+ 0 +null-ptr+ 0 +null-ptr+ 0)))
1005
1006 (defun %table-statistics (table hstmt &key unique (ensure t))
1007   (with-cstrings ((table-cs table))
1008     (with-error-handling (:hstmt hstmt)
1009       (SQLStatistics
1010        hstmt
1011        +null-ptr+ 0
1012        +null-ptr+ 0
1013        table-cs $SQL_NTS
1014        (if unique $SQL_INDEX_UNIQUE $SQL_INDEX_ALL)
1015        (if ensure $SQL_ENSURE $SQL_QUICK)))))
1016
1017 (defun %list-data-sources (henv)
1018   (let ((dsn (allocate-foreign-string (1+ $SQL_MAX_DSN_LENGTH)))
1019         (desc (allocate-foreign-string 256))
1020         (results nil))
1021     (unwind-protect
1022          (with-foreign-objects ((dsn-len :short)
1023                                 (desc-len :short))
1024            (let ((res (with-error-handling (:henv henv)
1025                         (SQLDataSources henv $SQL_FETCH_FIRST dsn
1026                                         (1+ $SQL_MAX_DSN_LENGTH)
1027                                         dsn-len desc 256 desc-len))))
1028              (when (or (eql res $SQL_SUCCESS)
1029                        (eql res $SQL_SUCCESS_WITH_INFO))
1030                (push (convert-from-foreign-string dsn) results))
1031
1032              (do ((res (with-error-handling (:henv henv)
1033                          (SQLDataSources henv $SQL_FETCH_NEXT dsn
1034                                          (1+ $SQL_MAX_DSN_LENGTH)
1035                                          dsn-len desc 256 desc-len))
1036                        (with-error-handling (:henv henv)
1037                          (SQLDataSources henv $SQL_FETCH_NEXT dsn
1038                                          (1+ $SQL_MAX_DSN_LENGTH)
1039                                          dsn-len desc 256 desc-len))))
1040                  ((not (or (eql res $SQL_SUCCESS)
1041                            (eql res $SQL_SUCCESS_WITH_INFO))))
1042                (push (convert-from-foreign-string dsn) results))))
1043       (progn
1044         (free-foreign-object dsn)
1045         (free-foreign-object desc)))
1046     (nreverse results)))
1047