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 ;;;; This file, part of CLSQL, is Copyright (c) 2004 by Kevin M. Rosenberg
  10 ;;;; and Copyright (C) Paul Meurer 1999 - 2001. All rights reserved.
  11 ;;;;
  12 ;;;; CLSQL users are granted the rights to distribute and use this software
  13 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
  14 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
  15 ;;;; *************************************************************************
  16
  17 (in-package #:odbc)
  18
  19 (defvar *null* nil
  20   "Lisp representation of SQL Null value, default = nil.
  21 May be locally bound to something else if a certain type is necessary.")
  22
  23
  24 (defvar *binary-format* :unsigned-byte-vector)
  25 (defvar *time-conversion-function*
  26     (lambda (universal-time &optional fraction)
  27        (let ((time (clsql-sys:utime->time universal-time)))
  28          (setf time (clsql-sys:time+
  29                      time
  30                      (clsql-sys:make-duration :usec (/ fraction 1000))))
  31          (clsql-sys:format-time nil time :format :iso))
  32       #+ignore
  33       universal-time)
  34    "Bound to a function that converts from a Lisp universal time fixnum (and a fractional
  35 as possible second argument) to the desired representation of date/time/timestamp. By default, returns an iso-timestring.")
  36
  37 (defvar +null-ptr+ (make-null-pointer :byte))
  38 (defparameter +null-handle-ptr+ (make-null-pointer :void))
  39 (defvar *info-output* nil
  40   "Stream to send SUCCESS_WITH_INFO messages.")
  41
  42 (defmacro %put-str (ptr string &optional max-length)
  43   (let ((size (gensym)))
  44     `(let ((,size (length ,string)))
  45        (when (and ,max-length (> ,size ,max-length))
  46          (error 'clsql:sql-database-data-error
  47                 :message
  48                 (format nil "string \"~a\" of length ~d is longer than max-length: ~d"
  49                         ,string ,size ,max-length)))
  50       (with-cast-pointer (char-ptr ,ptr :byte)
  51         (dotimes (i ,size)
  52           (setf (deref-array char-ptr '(:array :byte) i)
  53                 (char-code (char ,string i))))
  54         (setf (deref-array char-ptr '(:array :byte) ,size) 0)))))
  55
  56 (defun %cstring-into-vector (ptr vector offset size-in-bytes)
  57   (dotimes (i size-in-bytes)
  58     (setf (schar vector offset)
  59       (ensure-char-character
  60        (deref-array ptr '(:array :unsigned-char) i)))
  61     (incf offset))
  62   offset)
  63
  64 (defun handle-error (henv hdbc hstmt)
  65   (let ((sql-state (allocate-foreign-string 256))
  66         (error-message (allocate-foreign-string #.$SQL_MAX_MESSAGE_LENGTH)))
  67     (with-foreign-objects ((error-code #.$ODBC-LONG-TYPE)
  68                            (msg-length :short))
  69       (SQLError henv hdbc hstmt sql-state
  70                 error-code error-message
  71                 #.$SQL_MAX_MESSAGE_LENGTH msg-length)
  72       (let ((err (convert-from-foreign-string error-message))
  73             (state (convert-from-foreign-string sql-state)))
  74         (free-foreign-object error-message)
  75         (free-foreign-object sql-state)
  76         (values
  77          err
  78          state
  79          (deref-pointer msg-length :short)
  80          (deref-pointer error-code #.$ODBC-LONG-TYPE))))))
  81
  82 (defun sql-state (henv hdbc hstmt)
  83   (let ((sql-state (allocate-foreign-string 256))
  84         (error-message (allocate-foreign-string #.$SQL_MAX_MESSAGE_LENGTH)))
  85     (with-foreign-objects ((error-code #.$ODBC-LONG-TYPE)
  86                            (msg-length :short))
  87       (SQLError henv hdbc hstmt sql-state error-code
  88                 error-message #.$SQL_MAX_MESSAGE_LENGTH msg-length)
  89       (let ((state (convert-from-foreign-string sql-state)))
  90         (free-foreign-object error-message)
  91         (free-foreign-object sql-state)
  92         state
  93         ;; test this: return a keyword for efficiency
  94         ;;(%cstring-to-keyword state)
  95         ))))
  96
  97 (defmacro with-error-handling ((&key henv hdbc hstmt (print-info t))
  98                                    odbc-call &body body)
  99   (let ((result-code (gensym "RC-")))
 100     `(let ((,result-code ,odbc-call))
 101
 102       ;; Check for allegro v7 & v8 bug with ODBC calls returning
 103       ;; 32-bit unsigned ints, not 16-bit signed ints
 104       #+(and allegro mswindows)
 105       (when (> ,result-code #xFFFF)
 106         (warn (format nil "16-bit return bug: result-code #x~X for expression ~S"
 107                       ,result-code (quote ,odbc-call)))
 108         (setq ,result-code (logand ,result-code #xFFFF))
 109         (when (> ,result-code #x7FFF)
 110           (setq ,result-code (- ,result-code #x10000))))
 111
 112        (case ,result-code
 113          (#.$SQL_SUCCESS
 114           (progn ,result-code ,@body))
 115          (#.$SQL_SUCCESS_WITH_INFO
 116           (when ,print-info
 117             (multiple-value-bind (error-message sql-state)
 118                 (handle-error (or ,henv +null-handle-ptr+)
 119                               (or ,hdbc +null-handle-ptr+)
 120                               (or ,hstmt +null-handle-ptr+))
 121               (when *info-output*
 122                 (format *info-output* "[ODBC info ~A] ~A state: ~A"
 123                         ,result-code error-message
 124                         sql-state))))
 125           (progn ,result-code ,@body))
 126          (#.$SQL_INVALID_HANDLE
 127           (error
 128            'clsql-sys:sql-database-error
 129            :message "ODBC: Invalid handle"))
 130          (#.$SQL_STILL_EXECUTING
 131           (error
 132            'clsql-sys:sql-temporary-error
 133            :message "ODBC: Still executing"))
 134          (#.$SQL_ERROR
 135           (multiple-value-bind (error-message sql-state)
 136               (handle-error (or ,henv +null-handle-ptr+)
 137                             (or ,hdbc +null-handle-ptr+)
 138                             (or ,hstmt +null-handle-ptr+))
 139             (error
 140              'clsql-sys:sql-database-error
 141              :message error-message
 142              :secondary-error-id sql-state)))
 143          (#.$SQL_NO_DATA_FOUND
 144           (progn ,result-code ,@body))
 145          ;; work-around for Allegro 7.0beta AMD64 which returns negative numbers
 146          (otherwise
 147           (multiple-value-bind (error-message sql-state)
 148               (handle-error (or ,henv +null-handle-ptr+)
 149                             (or ,hdbc +null-handle-ptr+)
 150                             (or ,hstmt +null-handle-ptr+))
 151             (error
 152              'clsql-sys:sql-database-error
 153              :message error-message
 154              :secondary-error-id sql-state))
 155           #+ignore
 156           (progn ,result-code ,@body))))))
 157
 158 (defun %new-environment-handle ()
 159   (let ((henv
 160          (with-foreign-object (phenv 'sql-handle)
 161            (with-error-handling
 162                ()
 163              (SQLAllocHandle $SQL_HANDLE_ENV +null-handle-ptr+ phenv)
 164              (deref-pointer phenv 'sql-handle)))))
 165     (%set-attr-odbc-version henv $SQL_OV_ODBC3)
 166     henv))
 167
 168
 169 (defun %sql-free-environment (henv)
 170   (with-error-handling
 171     (:henv henv)
 172     (SQLFreeEnv henv)))
 173
 174 (defun %new-db-connection-handle (henv)
 175   (with-foreign-object (phdbc 'sql-handle)
 176     (setf (deref-pointer phdbc 'sql-handle) +null-handle-ptr+)
 177     (with-error-handling
 178       (:henv henv)
 179       (SQLAllocHandle $SQL_HANDLE_DBC henv phdbc)
 180       (deref-pointer phdbc 'sql-handle))))
 181
 182 (defun %free-statement (hstmt option)
 183   (with-error-handling
 184       (:hstmt hstmt)
 185       (SQLFreeStmt
 186        hstmt
 187        (ecase option
 188          (:drop $SQL_DROP)
 189          (:close $SQL_CLOSE)
 190          (:unbind $SQL_UNBIND)
 191          (:reset $SQL_RESET_PARAMS)))))
 192
 193 (defmacro with-statement-handle ((hstmt hdbc) &body body)
 194   `(let ((,hstmt (%new-statement-handle ,hdbc)))
 195      (unwind-protect
 196        (progn ,@body)
 197        (%free-statement ,hstmt :drop))))
 198
 199 ;; functional interface
 200
 201 (defun %sql-connect (hdbc server uid pwd)
 202   (with-cstrings ((server-ptr server)
 203                   (uid-ptr uid)
 204                   (pwd-ptr pwd))
 205     (with-error-handling
 206         (:hdbc hdbc)
 207       (SQLConnect hdbc server-ptr $SQL_NTS uid-ptr
 208                   $SQL_NTS pwd-ptr $SQL_NTS))))
 209
 210 (defun %sql-driver-connect (hdbc connection-string completion window-handle)
 211   (with-cstring (connection-ptr connection-string)
 212     (let ((completed-connection-string (allocate-foreign-string $SQL_MAX_CONN_OUT)))
 213       (unwind-protect
 214           (with-foreign-object (completed-connection-length :short)
 215                                (with-error-handling
 216                                    (:hdbc hdbc)
 217                                    (SQLDriverConnect hdbc
 218                                                      window-handle
 219                                                      connection-ptr $SQL_NTS
 220                                                      completed-connection-string $SQL_MAX_CONN_OUT
 221                                                      completed-connection-length
 222                                                      completion)))
 223         (free-foreign-object completed-connection-string)))))
 224
 225 (defun %disconnect (hdbc)
 226   (with-error-handling
 227     (:hdbc hdbc)
 228     (SQLDisconnect hdbc)))
 229
 230 (defun %commit (henv hdbc)
 231   (with-error-handling
 232     (:henv henv :hdbc hdbc)
 233     (SQLTransact
 234      henv hdbc $SQL_COMMIT)))
 235
 236 (defun %rollback (henv hdbc)
 237   (with-error-handling
 238     (:henv henv :hdbc hdbc)
 239     (SQLTransact
 240      henv hdbc $SQL_ROLLBACK)))
 241
 242 ; col-nr is zero-based in Lisp but 1 based in sql
 243 ; col-nr = :bookmark retrieves a bookmark.
 244 (defun %bind-column (hstmt column-nr c-type data-ptr precision out-len-ptr)
 245   (with-error-handling
 246     (:hstmt hstmt)
 247     (SQLBindCol hstmt
 248                 (if (eq column-nr :bookmark) 0 (1+ column-nr))
 249                 c-type data-ptr precision out-len-ptr)))
 250
 251 ; parameter-nr is zero-based in Lisp
 252 (defun %sql-bind-parameter (hstmt parameter-nr parameter-type c-type
 253                                       sql-type precision scale data-ptr
 254                                       max-value out-len-ptr)
 255   (with-error-handling
 256     (:hstmt hstmt)
 257     (SQLBindParameter hstmt (1+ parameter-nr)
 258                       parameter-type ;$SQL_PARAM_INPUT
 259                       c-type ;$SQL_C_CHAR
 260                       sql-type ;$SQL_VARCHAR
 261                       precision ;(1- (length str))
 262                       scale ;0
 263                       data-ptr
 264                       max-value
 265                       out-len-ptr ;#.+null-ptr+
 266                       )))
 267
 268 (defun %sql-fetch (hstmt)
 269   (with-error-handling
 270       (:hstmt hstmt)
 271       (SQLFetch hstmt)))
 272
 273 (defun %new-statement-handle (hdbc)
 274   (let ((statement-handle
 275          (with-foreign-object (phstmt 'sql-handle)
 276            (with-error-handling
 277                (:hdbc hdbc)
 278              (SQLAllocHandle $SQL_HANDLE_STMT hdbc phstmt)
 279              (deref-pointer phstmt 'sql-handle)))))
 280     (if (uffi:null-pointer-p statement-handle)
 281         (error 'clsql:sql-database-error :message "Received null statement handle.")
 282         statement-handle)))
 283
 284 (defun %sql-get-info (hdbc info-type)
 285   (ecase info-type
 286     ;; those return string
 287     ((#.$SQL_ACCESSIBLE_PROCEDURES
 288       #.$SQL_ACCESSIBLE_TABLES
 289       #.$SQL_COLUMN_ALIAS
 290       #.$SQL_DATA_SOURCE_NAME
 291       #.$SQL_DATA_SOURCE_READ_ONLY
 292       #.$SQL_DBMS_NAME
 293       #.$SQL_DBMS_VER
 294       #.$SQL_DRIVER_NAME
 295       #.$SQL_DRIVER_ODBC_VER
 296       #.$SQL_DRIVER_VER
 297       #.$SQL_EXPRESSIONS_IN_ORDERBY
 298       #.$SQL_IDENTIFIER_QUOTE_CHAR
 299       #.$SQL_KEYWORDS
 300       #.$SQL_LIKE_ESCAPE_CLAUSE
 301       #.$SQL_MAX_ROW_SIZE_INCLUDES_LONG
 302       #.$SQL_MULT_RESULT_SETS
 303       #.$SQL_MULTIPLE_ACTIVE_TXN
 304       #.$SQL_NEED_LONG_DATA_LEN
 305       #.$SQL_ODBC_SQL_OPT_IEF
 306       #.$SQL_ODBC_VER
 307       #.$SQL_ORDER_BY_COLUMNS_IN_SELECT
 308       #.$SQL_OUTER_JOINS
 309       #.$SQL_OWNER_TERM
 310       #.$SQL_PROCEDURE_TERM
 311       #.$SQL_PROCEDURES
 312       #.$SQL_QUALIFIER_NAME_SEPARATOR
 313       #.$SQL_QUALIFIER_TERM
 314       #.$SQL_ROW_UPDATES
 315       #.$SQL_SEARCH_PATTERN_ESCAPE
 316       #.$SQL_SERVER_NAME
 317       #.$SQL_SPECIAL_CHARACTERS
 318       #.$SQL_TABLE_TERM
 319       #.$SQL_USER_NAME)
 320      (let ((info-ptr (allocate-foreign-string 1024)))
 321        (with-foreign-object (info-length-ptr :short)
 322          (with-error-handling
 323              (:hdbc hdbc)
 324              (SQLGetInfo hdbc info-type info-ptr 1023 info-length-ptr)
 325            (let ((info (convert-from-foreign-string info-ptr)))
 326              (free-foreign-object info-ptr)
 327              info)))))
 328     ;; those returning a word
 329     ((#.$SQL_ACTIVE_CONNECTIONS
 330       #.$SQL_ACTIVE_STATEMENTS
 331       #.$SQL_CONCAT_NULL_BEHAVIOR
 332       #.$SQL_CORRELATION_NAME
 333       #.$SQL_CURSOR_COMMIT_BEHAVIOR
 334       #.$SQL_CURSOR_ROLLBACK_BEHAVIOR
 335       #.$SQL_MAX_COLUMN_NAME_LEN
 336       #.$SQL_MAX_COLUMNS_IN_GROUP_BY
 337       #.$SQL_MAX_COLUMNS_IN_INDEX
 338       #.$SQL_MAX_COLUMNS_IN_ORDER_BY
 339       #.$SQL_MAX_COLUMNS_IN_SELECT
 340       #.$SQL_MAX_COLUMNS_IN_TABLE
 341       #.$SQL_MAX_CURSOR_NAME_LEN
 342       #.$SQL_MAX_OWNER_NAME_LEN
 343       #.$SQL_MAX_PROCEDURE_NAME_LEN
 344       #.$SQL_MAX_QUALIFIER_NAME_LEN
 345       #.$SQL_MAX_TABLE_NAME_LEN
 346       #.$SQL_MAX_TABLES_IN_SELECT
 347       #.$SQL_MAX_USER_NAME_LEN
 348       #.$SQL_NON_NULLABLE_COLUMNS
 349       #.$SQL_NULL_COLLATION
 350       #.$SQL_ODBC_API_CONFORMANCE
 351       #.$SQL_ODBC_SAG_CLI_CONFORMANCE
 352       #.$SQL_ODBC_SQL_CONFORMANCE
 353       #.$SQL_QUALIFIER_LOCATION
 354       #.$SQL_QUOTED_IDENTIFIER_CASE
 355       #.$SQL_TXN_CAPABLE)
 356      (with-foreign-objects ((info-ptr :short)
 357                             (info-length-ptr :short))
 358        (with-error-handling
 359         (:hdbc hdbc)
 360          (SQLGetInfo hdbc
 361                      info-type
 362                      info-ptr
 363                      255
 364                      info-length-ptr)
 365          (deref-pointer info-ptr :short)))
 366      )
 367     ;; those returning a long bitmask
 368     ((#.$SQL_ALTER_TABLE
 369       #.$SQL_BOOKMARK_PERSISTENCE
 370       #.$SQL_CONVERT_BIGINT
 371       #.$SQL_CONVERT_BINARY
 372       #.$SQL_CONVERT_BIT
 373       #.$SQL_CONVERT_CHAR
 374       #.$SQL_CONVERT_DATE
 375       #.$SQL_CONVERT_DECIMAL
 376       #.$SQL_CONVERT_DOUBLE
 377       #.$SQL_CONVERT_FLOAT
 378       #.$SQL_CONVERT_INTEGER
 379       #.$SQL_CONVERT_LONGVARCHAR
 380       #.$SQL_CONVERT_NUMERIC
 381       #.$SQL_CONVERT_REAL
 382       #.$SQL_CONVERT_SMALLINT
 383       #.$SQL_CONVERT_TIME
 384       #.$SQL_CONVERT_TIMESTAMP
 385       #.$SQL_CONVERT_TINYINT
 386       #.$SQL_CONVERT_VARBINARY
 387       #.$SQL_CONVERT_VARCHAR
 388       #.$SQL_CONVERT_LONGVARBINARY
 389       #.$SQL_CONVERT_FUNCTIONS
 390       #.$SQL_FETCH_DIRECTION
 391       #.$SQL_FILE_USAGE
 392       #.$SQL_GETDATA_EXTENSIONS
 393       #.$SQL_LOCK_TYPES
 394       #.$SQL_MAX_INDEX_SIZE
 395       #.$SQL_MAX_ROW_SIZE
 396       #.$SQL_MAX_STATEMENT_LEN
 397       #.$SQL_NUMERIC_FUNCTIONS
 398       #.$SQL_OWNER_USAGE
 399       #.$SQL_POS_OPERATIONS
 400       #.$SQL_POSITIONED_STATEMENTS
 401       #.$SQL_QUALIFIER_USAGE
 402       #.$SQL_SCROLL_CONCURRENCY
 403       #.$SQL_SCROLL_OPTIONS
 404       #.$SQL_STATIC_SENSITIVITY
 405       #.$SQL_STRING_FUNCTIONS
 406       #.$SQL_SUBQUERIES
 407       #.$SQL_SYSTEM_FUNCTIONS
 408       #.$SQL_TIMEDATE_ADD_INTERVALS
 409       #.$SQL_TIMEDATE_DIFF_INTERVALS
 410       #.$SQL_TIMEDATE_FUNCTIONS
 411       #.$SQL_TXN_ISOLATION_OPTION
 412       #.$SQL_UNION)
 413      (with-foreign-objects ((info-ptr #.$ODBC-LONG-TYPE)
 414                             (info-length-ptr :short))
 415        (with-error-handling
 416          (:hdbc hdbc)
 417          (SQLGetInfo hdbc
 418                      info-type
 419                      info-ptr
 420                      255
 421                      info-length-ptr)
 422          (deref-pointer info-ptr #.$ODBC-LONG-TYPE)))
 423      )
 424     ;; those returning a long integer
 425     ((#.$SQL_DEFAULT_TXN_ISOLATION
 426       #.$SQL_DRIVER_HDBC
 427       #.$SQL_DRIVER_HENV
 428       #.$SQL_DRIVER_HLIB
 429       #.$SQL_DRIVER_HSTMT
 430       #.$SQL_GROUP_BY
 431       #.$SQL_IDENTIFIER_CASE
 432       #.$SQL_MAX_BINARY_LITERAL_LEN
 433       #.$SQL_MAX_CHAR_LITERAL_LEN
 434       #.$SQL_ACTIVE_ENVIRONMENTS
 435       )
 436      (with-foreign-objects ((info-ptr #.$ODBC-LONG-TYPE)
 437                             (info-length-ptr :short))
 438        (with-error-handling
 439          (:hdbc hdbc)
 440          (SQLGetInfo hdbc info-type info-ptr 255 info-length-ptr)
 441          (deref-pointer info-ptr #.$ODBC-LONG-TYPE))))))
 442
 443 (defun %sql-exec-direct (sql hstmt henv hdbc)
 444   (with-cstring (sql-ptr sql)
 445     (with-error-handling
 446       (:hstmt hstmt :henv henv :hdbc hdbc)
 447       (SQLExecDirect hstmt sql-ptr $SQL_NTS))))
 448
 449 (defun %sql-cancel (hstmt)
 450   (with-error-handling
 451     (:hstmt hstmt)
 452     (SQLCancel hstmt)))
 453
 454 (defun %sql-execute (hstmt)
 455   (with-error-handling
 456     (:hstmt hstmt)
 457     (SQLExecute hstmt)))
 458
 459 (defun result-columns-count (hstmt)
 460   (with-foreign-objects ((columns-nr-ptr :short))
 461     (with-error-handling (:hstmt hstmt)
 462                          (SQLNumResultCols hstmt columns-nr-ptr)
 463       (deref-pointer columns-nr-ptr :short))))
 464
 465 (defun result-rows-count (hstmt)
 466   (with-foreign-objects ((row-count-ptr #.$ODBC-LONG-TYPE))
 467     (with-error-handling (:hstmt hstmt)
 468                          (SQLRowCount hstmt row-count-ptr)
 469       (deref-pointer row-count-ptr #.$ODBC-LONG-TYPE))))
 470
 471 ;; column counting is 1-based
 472 (defun %describe-column (hstmt column-nr)
 473   (let ((column-name-ptr (allocate-foreign-string 256)))
 474     (with-foreign-objects ((column-name-length-ptr :short)
 475                            (column-sql-type-ptr :short)
 476                            (column-precision-ptr #.$ODBC-ULONG-TYPE)
 477                            (column-scale-ptr :short)
 478                            (column-nullable-p-ptr :short))
 479       (with-error-handling (:hstmt hstmt)
 480           (SQLDescribeCol hstmt column-nr column-name-ptr 256
 481                           column-name-length-ptr
 482                           column-sql-type-ptr
 483                           column-precision-ptr
 484                           column-scale-ptr
 485                           column-nullable-p-ptr)
 486         (let ((column-name (convert-from-foreign-string column-name-ptr)))
 487           (free-foreign-object column-name-ptr)
 488           (values
 489            column-name
 490            (deref-pointer column-sql-type-ptr :short)
 491            (deref-pointer column-precision-ptr #.$ODBC-ULONG-TYPE)
 492            (deref-pointer column-scale-ptr :short)
 493            (deref-pointer column-nullable-p-ptr :short)))))))
 494
 495 ;; parameter counting is 1-based
 496 ;; this function isn't used, which is good because FreeTDS dosn't support it.
 497 (defun %describe-parameter (hstmt parameter-nr)
 498   (with-foreign-objects ((column-sql-type-ptr :short)
 499                          (column-precision-ptr #.$ODBC-ULONG-TYPE)
 500                          (column-scale-ptr :short)
 501                          (column-nullable-p-ptr :short))
 502     (with-error-handling
 503       (:hstmt hstmt)
 504       (SQLDescribeParam hstmt parameter-nr
 505                         column-sql-type-ptr
 506                         column-precision-ptr
 507                         column-scale-ptr
 508                         column-nullable-p-ptr)
 509       (values
 510        (deref-pointer column-sql-type-ptr :short)
 511        (deref-pointer column-precision-ptr #.$ODBC-ULONG-TYPE)
 512        (deref-pointer column-scale-ptr :short)
 513        (deref-pointer column-nullable-p-ptr :short)))))
 514
 515 (defun %column-attributes (hstmt column-nr descriptor-type)
 516   (let ((descriptor-info-ptr (allocate-foreign-string 256)))
 517     (with-foreign-objects ((descriptor-length-ptr :short)
 518                            (numeric-descriptor-ptr #.$ODBC-LONG-TYPE))
 519       (with-error-handling
 520           (:hstmt hstmt)
 521           (SQLColAttributes hstmt column-nr descriptor-type descriptor-info-ptr
 522                             256 descriptor-length-ptr
 523                             numeric-descriptor-ptr)
 524         (let ((desc (convert-from-foreign-string descriptor-info-ptr)))
 525           (free-foreign-object descriptor-info-ptr)
 526           (values
 527            desc
 528            (deref-pointer numeric-descriptor-ptr #.$ODBC-LONG-TYPE)))))))
 529
 530 (defun %prepare-describe-columns (hstmt table-qualifier table-owner
 531                                    table-name column-name)
 532   (with-cstrings ((table-qualifier-ptr table-qualifier)
 533                   (table-owner-ptr table-owner)
 534                   (table-name-ptr table-name)
 535                   (column-name-ptr column-name))
 536     (with-error-handling
 537         (:hstmt hstmt)
 538       (SQLColumns hstmt
 539                   table-qualifier-ptr (length table-qualifier)
 540                   table-owner-ptr (length table-owner)
 541                   table-name-ptr (length table-name)
 542                   column-name-ptr (length column-name)))))
 543
 544 (defun %describe-columns (hdbc table-qualifier table-owner
 545                           table-name column-name)
 546   (with-statement-handle (hstmt hdbc)
 547     (%prepare-describe-columns hstmt table-qualifier table-owner
 548                                table-name column-name)
 549     (fetch-all-rows hstmt)))
 550
 551 (defun %sql-data-sources (henv &key (direction :first))
 552   (let ((name-ptr (allocate-foreign-string (1+ $SQL_MAX_DSN_LENGTH)))
 553         (description-ptr (allocate-foreign-string 1024)))
 554     (with-foreign-objects ((name-length-ptr :short)
 555                            (description-length-ptr :short))
 556       (let ((res (with-error-handling
 557                      (:henv henv)
 558                      (SQLDataSources henv
 559                                      (ecase direction
 560                                        (:first $SQL_FETCH_FIRST)
 561                                        (:next $SQL_FETCH_NEXT))
 562                                      name-ptr
 563                                      (1+ $SQL_MAX_DSN_LENGTH)
 564                                      name-length-ptr
 565                                      description-ptr
 566                                      1024
 567                                      description-length-ptr))))
 568         (cond
 569           ((= res $SQL_NO_DATA_FOUND)
 570            (let ((name (convert-from-foreign-string name-ptr))
 571                  (desc (convert-from-foreign-string description-ptr)))
 572              (free-foreign-object name-ptr)
 573              (free-foreign-object description-ptr)
 574              (values
 575               name
 576               desc)))
 577           (t
 578            (free-foreign-object name-ptr)
 579            (free-foreign-object description-ptr)
 580            nil))))))
 581
 582
 583
 584 (defun sql-to-c-type (sql-type)
 585   (ecase sql-type
 586     ((#.$SQL_CHAR #.$SQL_VARCHAR #.$SQL_LONGVARCHAR
 587       #.$SQL_NUMERIC #.$SQL_DECIMAL -8 -9 -10) $SQL_C_CHAR) ;; Added -10 for MSSQL ntext type
 588     (#.$SQL_INTEGER $SQL_C_SLONG)
 589     (#.$SQL_BIGINT $SQL_C_SBIGINT)
 590     (#.$SQL_SMALLINT $SQL_C_SSHORT)
 591     (#.$SQL_DOUBLE $SQL_C_DOUBLE)
 592     (#.$SQL_FLOAT $SQL_C_DOUBLE)
 593     (#.$SQL_REAL $SQL_C_FLOAT)
 594     (#.$SQL_DATE $SQL_C_DATE)
 595     (#.$SQL_TIME $SQL_C_TIME)
 596     (#.$SQL_TIMESTAMP $SQL_C_TIMESTAMP)
 597     (#.$SQL_TYPE_DATE $SQL_C_TYPE_DATE)
 598     (#.$SQL_TYPE_TIME $SQL_C_TYPE_TIME)
 599     (#.$SQL_TYPE_TIMESTAMP $SQL_C_TYPE_TIMESTAMP)
 600     ((#.$SQL_BINARY #.$SQL_VARBINARY #.$SQL_LONGVARBINARY) $SQL_C_BINARY)
 601     (#.$SQL_TINYINT $SQL_C_STINYINT)
 602     (#.$SQL_BIT $SQL_C_BIT)))
 603
 604 (def-type byte-pointer-type (* :byte))
 605 (def-type short-pointer-type (* :short))
 606 (def-type int-pointer-type (* :int))
 607 (def-type long-pointer-type (* #.$ODBC-LONG-TYPE))
 608 (def-type big-pointer-type (* #.$ODBC-BIG-TYPE))
 609 (def-type float-pointer-type (* :float))
 610 (def-type double-pointer-type (* :double))
 611 (def-type string-pointer-type (* :unsigned-char))
 612
 613 (defun get-cast-byte (ptr)
 614   (locally (declare (type byte-pointer-type ptr))
 615     (deref-pointer ptr :byte)))
 616
 617 (defun get-cast-short (ptr)
 618   (locally (declare (type short-pointer-type ptr))
 619     (deref-pointer ptr :short)))
 620
 621 (defun get-cast-int (ptr)
 622   (locally (declare (type int-pointer-type ptr))
 623     (deref-pointer ptr :int)))
 624
 625 (defun get-cast-long (ptr)
 626   (locally (declare (type long-pointer-type ptr))
 627     (deref-pointer ptr #.$ODBC-LONG-TYPE)))
 628
 629 (defun get-cast-big (ptr)
 630   (locally (declare (type big-pointer-type ptr))
 631     (deref-pointer ptr #.$ODBC-BIG-TYPE)))
 632
 633 (defun get-cast-single-float (ptr)
 634   (locally (declare (type float-pointer-type ptr))
 635     (deref-pointer ptr :float)))
 636
 637 (defun get-cast-double-float (ptr)
 638   (locally (declare (type double-pointer-type ptr))
 639     (deref-pointer ptr :double)))
 640
 641 (defun get-cast-foreign-string (ptr)
 642   (locally (declare (type string-pointer-type ptr))
 643     (convert-from-foreign-string ptr)))
 644
 645 (defun get-cast-binary (ptr len format)
 646   "FORMAT is one of :unsigned-byte-vector, :bit-vector (:string, :hex-string)"
 647   (with-cast-pointer (casted ptr :unsigned-byte)
 648     (ecase format
 649       (:unsigned-byte-vector
 650        (let ((vector (make-array len :element-type '(unsigned-byte 8))))
 651          (dotimes (i len)
 652            (setf (aref vector i)
 653                  (deref-array casted '(:array :unsigned-byte) i)))
 654          vector))
 655       (:bit-vector
 656        (let ((vector (make-array (ash len 3) :element-type 'bit)))
 657          (dotimes (i len)
 658            (let ((byte (deref-array casted '(:array :byte) i)))
 659              (dotimes (j 8)
 660                (setf (bit vector (+ (ash i 3) j))
 661                      (logand (ash byte (- j 7)) 1)))))
 662          vector)))))
 663
 664
 665 (defun read-data (data-ptr c-type sql-type out-len-ptr result-type)
 666   (declare (type long-ptr-type out-len-ptr))
 667   (let* ((out-len (deref-pointer out-len-ptr #.$ODBC-LONG-TYPE))
 668          (value
 669           (cond ((= out-len $SQL_NULL_DATA)
 670                  *null*)
 671                 (t
 672                  (case sql-type
 673                    ;; SQL extended datatypes
 674                    (#.$SQL_TINYINT  (get-cast-byte data-ptr))
 675                    (#.$SQL_C_STINYINT (get-cast-byte data-ptr)) ;; ?
 676                    (#.$SQL_C_SSHORT (get-cast-short data-ptr)) ;; ?
 677                    (#.$SQL_SMALLINT (get-cast-short data-ptr)) ;; ??
 678                    (#.$SQL_INTEGER (get-cast-int data-ptr))
 679                    (#.$SQL_BIGINT (get-cast-big data-ptr))
 680                    (#.$SQL_DECIMAL
 681                     (let ((*read-base* 10))
 682                       (read-from-string (get-cast-foreign-string data-ptr))))
 683                    (#.$SQL_BIT (get-cast-byte data-ptr))
 684                    (t
 685                     (case c-type
 686                       ((#.$SQL_C_DATE #.$SQL_C_TYPE_DATE)
 687                        (funcall *time-conversion-function* (date-to-universal-time data-ptr)))
 688                       ((#.$SQL_C_TIME #.$SQL_C_TYPE_TIME)
 689                        (multiple-value-bind (universal-time frac) (time-to-universal-time data-ptr)
 690                          (funcall *time-conversion-function* universal-time frac)))
 691                       ((#.$SQL_C_TIMESTAMP #.$SQL_C_TYPE_TIMESTAMP)
 692                        (multiple-value-bind (universal-time frac) (timestamp-to-universal-time data-ptr)
 693                          (funcall *time-conversion-function* universal-time frac)))
 694                       (#.$SQL_INTEGER
 695                        (get-cast-int data-ptr))
 696                       (#.$SQL_C_FLOAT
 697                        (get-cast-single-float data-ptr))
 698                       (#.$SQL_C_DOUBLE
 699                        (get-cast-double-float data-ptr))
 700                       (#.$SQL_C_SLONG
 701                        (get-cast-long data-ptr))
 702                       #+lispworks
 703                       (#.$SQL_C_BIT     ; encountered only in Access
 704                        (get-cast-byte data-ptr))
 705                       (#.$SQL_C_BINARY
 706                        (get-cast-binary data-ptr out-len *binary-format*))
 707                       ((#.$SQL_C_SSHORT #.$SQL_C_STINYINT) ; LMH short ints
 708                        (get-cast-short data-ptr)) ; LMH
 709                       (#.$SQL_C_SBIGINT (uffi:allocate-foreign-object #.$ODBC-BIG-TYPE)
 710                        (get-cast-short data-ptr))
 711                       #+ignore
 712                       (#.$SQL_C_CHAR
 713                        (code-char (get-cast-short data-ptr)))
 714                       (t
 715                        (get-cast-foreign-string data-ptr)))))))))
 716
 717     ;; FIXME: this could be better optimized for types which use READ-FROM-STRING above
 718
 719     (if (and (or (eq result-type t) (eq result-type :string))
 720              value
 721              (not (stringp value)))
 722         (write-to-string value)
 723       value)))
 724
 725 ;; which value is appropriate?
 726 (defparameter +max-precision+  4001)
 727
 728 (defvar *break-on-unknown-data-type* t)
 729
 730 ;; C. Stacy's idea to factor this out
 731 ;; "Make it easy to add new datatypes by making new subroutine %ALLOCATE-BINDINGS,
 732 ;; so that I don't have to remember to make changes in more than one place.
 733 ;; Just keep it in synch with READ-DATA."
 734 (defun %allocate-bindings (sql-type precision)
 735   (let* ((c-type (sql-to-c-type sql-type))
 736          (size (if (zerop precision)
 737                    +max-precision+ ;; if the precision cannot be determined
 738                  (min precision +max-precision+)))
 739          (long-p (= size +max-precision+))
 740          (data-ptr
 741           (case c-type ;; add more?
 742             (#.$SQL_C_SLONG (uffi:allocate-foreign-object #.$ODBC-LONG-TYPE))
 743             ((#.$SQL_C_DATE #.$SQL_C_TYPE_DATE) (allocate-foreign-object 'sql-c-date))
 744             ((#.$SQL_C_TIME #.$SQL_C_TYPE_TIME) (allocate-foreign-object 'sql-c-time))
 745             ((#.$SQL_C_TIMESTAMP #.$SQL_C_TYPE_TIMESTAMP) (allocate-foreign-object 'sql-c-timestamp))
 746             (#.$SQL_C_FLOAT (uffi:allocate-foreign-object :float))
 747             (#.$SQL_C_DOUBLE (uffi:allocate-foreign-object :double))
 748             (#.$SQL_C_BIT (uffi:allocate-foreign-object :byte))
 749             (#.$SQL_C_STINYINT (uffi:allocate-foreign-object :byte))
 750             (#.$SQL_C_SBIGINT (uffi:allocate-foreign-object #.$ODBC-BIG-TYPE))
 751             (#.$SQL_C_SSHORT (uffi:allocate-foreign-object :short))
 752             (#.$SQL_C_CHAR (uffi:allocate-foreign-string (1+ size)))
 753             (#.$SQL_C_BINARY (uffi:allocate-foreign-string (1+ (* 2 size))))
 754             (t
 755                 ;; Maybe should signal a restartable condition for this?
 756                 (when *break-on-unknown-data-type*
 757                   (break "SQL type is ~A, precision ~D, size ~D, C type is ~A"
 758                          sql-type precision size c-type))
 759                 (uffi:allocate-foreign-object :byte (1+ size)))))
 760          (out-len-ptr (uffi:allocate-foreign-object #.$ODBC-LONG-TYPE)))
 761     (values c-type data-ptr out-len-ptr size long-p)))
 762
 763 (defun fetch-all-rows (hstmt &key free-option flatp)
 764   (let ((column-count (result-columns-count hstmt)))
 765     (unless (zerop column-count)
 766       (let ((names (make-array column-count))
 767             (sql-types (make-array column-count :element-type 'fixnum))
 768             (c-types (make-array column-count :element-type 'fixnum))
 769             (precisions (make-array column-count :element-type 'fixnum))
 770             (data-ptrs (make-array column-count :initial-element nil))
 771             (out-len-ptrs (make-array column-count :initial-element nil))
 772             (scales (make-array column-count :element-type 'fixnum))
 773             (nullables-p (make-array column-count :element-type 'fixnum)))
 774         (unwind-protect
 775           (values
 776            (progn
 777              (dotimes (col-nr column-count)
 778                ;; get column information
 779                (multiple-value-bind (name sql-type precision scale nullable-p)
 780                                     (%describe-column hstmt (1+ col-nr))
 781                  ;; allocate space to bind result rows to
 782                  (multiple-value-bind (c-type data-ptr out-len-ptr)
 783                      (%allocate-bindings sql-type precision)
 784                    (%bind-column hstmt col-nr c-type data-ptr (1+ precision) out-len-ptr)
 785                    (setf (svref names col-nr) name
 786                          (aref sql-types col-nr) sql-type
 787                          (aref c-types col-nr) (sql-to-c-type sql-type)
 788                          (aref precisions col-nr) (if (zerop precision) 0 precision)
 789                          (aref scales col-nr) scale
 790                          (aref nullables-p col-nr) nullable-p
 791                          (aref data-ptrs col-nr) data-ptr
 792                          (aref out-len-ptrs col-nr) out-len-ptr))))
 793              ;; the main loop
 794              (prog1
 795                (cond (flatp
 796                       (when (> column-count 1)
 797                         (error 'clsql:sql-database-error
 798                                :message "If more than one column is to be fetched, flatp has to be nil."))
 799                       (loop until (= (%sql-fetch hstmt) $SQL_NO_DATA_FOUND)
 800                             collect
 801                             (read-data (aref data-ptrs 0)
 802                                        (aref c-types 0)
 803                                        (aref sql-types 0)
 804                                        (aref out-len-ptrs 0)
 805                                        t)))
 806                      (t
 807                       (loop until (= (%sql-fetch hstmt) $SQL_NO_DATA_FOUND)
 808                             collect
 809                             (loop for col-nr from 0 to (1- column-count)
 810                                   collect
 811                                   (read-data (aref data-ptrs col-nr)
 812                                              (aref c-types col-nr)
 813                                              (aref sql-types col-nr)
 814                                              (aref out-len-ptrs col-nr)
 815                                              t)))))))
 816            names)
 817           ;; dispose of memory etc
 818           (when free-option (%free-statement hstmt free-option))
 819           (dotimes (col-nr column-count)
 820             (let ((data-ptr (aref data-ptrs col-nr))
 821                   (out-len-ptr (aref out-len-ptrs col-nr)))
 822               (when data-ptr (free-foreign-object data-ptr)) ; we *did* allocate them
 823               (when out-len-ptr (free-foreign-object out-len-ptr)))))))))
 824
 825 ;; to do: factor out common parts, put the sceleton (the obligatory macro part)
 826 ;; of %do-fetch into sql package (has been done)
 827
 828 (defun %sql-prepare (hstmt sql)
 829   (with-cstring (sql-ptr sql)
 830     (with-error-handling (:hstmt hstmt)
 831       (SQLPrepare hstmt sql-ptr $SQL_NTS))))
 832
 833 ;; depending on option, we return a long int or a string; string not implemented
 834 (defun get-connection-option (hdbc option)
 835   (with-foreign-object (param-ptr #.$ODBC-LONG-TYPE)
 836     (with-error-handling (:hdbc hdbc)
 837                          (SQLGetConnectOption hdbc option param-ptr)
 838       (deref-pointer param-ptr #.$ODBC-LONG-TYPE))))
 839
 840 (defun set-connection-option (hdbc option param)
 841   (with-error-handling (:hdbc hdbc)
 842     (SQLSetConnectOption hdbc option param)))
 843
 844 (defun disable-autocommit (hdbc)
 845   (set-connection-option hdbc $SQL_AUTOCOMMIT $SQL_AUTOCOMMIT_OFF))
 846
 847 (defun enable-autocommit (hdbc)
 848   (set-connection-option hdbc $SQL_AUTOCOMMIT $SQL_AUTOCOMMIT_ON))
 849
 850 (defun %sql-set-pos (hstmt row option lock)
 851   (with-error-handling
 852     (:hstmt hstmt)
 853     (SQLSetPos hstmt row option lock)))
 854
 855 (defun %sql-extended-fetch (hstmt fetch-type row)
 856   (with-foreign-objects ((row-count-ptr #.$ODBC-ULONG-TYPE)
 857                          (row-status-ptr :short))
 858     (with-error-handling (:hstmt hstmt)
 859       (SQLExtendedFetch hstmt fetch-type row row-count-ptr
 860                         row-status-ptr)
 861       (values (deref-pointer row-count-ptr #.$ODBC-ULONG-TYPE)
 862               (deref-pointer row-status-ptr :short)))))
 863
 864 ; column-nr is zero-based
 865 (defun %sql-get-data (hstmt column-nr c-type data-ptr precision out-len-ptr)
 866   (with-error-handling
 867     (:hstmt hstmt :print-info nil)
 868     (SQLGetData hstmt (if (eq column-nr :bookmark) 0 (1+ column-nr))
 869                 c-type data-ptr precision out-len-ptr)))
 870
 871 (defun %sql-param-data (hstmt param-ptr)
 872   (with-error-handling (:hstmt hstmt :print-info t) ;; nil
 873       (SQLParamData hstmt param-ptr)))
 874
 875 (defun %sql-put-data (hstmt data-ptr size)
 876   (with-error-handling
 877     (:hstmt hstmt :print-info t) ;; nil
 878     (SQLPutData hstmt data-ptr size)))
 879
 880 (defconstant $sql-data-truncated (intern "01004" :keyword))
 881
 882 (defun read-data-in-chunks (hstmt column-nr data-ptr c-type sql-type
 883                                       out-len-ptr result-type)
 884   (declare (type long-ptr-type out-len-ptr)
 885            (ignore result-type))
 886   (let* ((res (%sql-get-data hstmt column-nr c-type data-ptr
 887                              +max-precision+ out-len-ptr))
 888          (out-len (deref-pointer out-len-ptr #.$ODBC-LONG-TYPE))
 889          (offset 0)
 890          (result (case out-len
 891                    (#.$SQL_NULL_DATA
 892                     (return-from read-data-in-chunks *null*))
 893                    (#.$SQL_NO_TOTAL ;; don't know how long it is going to be
 894                                     (let ((str (make-array 0 :element-type 'character :adjustable t)))
 895                                       (loop do (if (= c-type #.$SQL_CHAR)
 896                                                    (let ((data-length (foreign-string-length data-ptr)))
 897                                                      (adjust-array str (+ offset data-length)
 898                                                                    :initial-element #\?)
 899                                                      (setf offset (%cstring-into-vector
 900                                                                    data-ptr str
 901                                                                    offset
 902                                                                    data-length)))
 903                                                  (error 'clsql:sql-database-error :message "wrong type. preliminary."))
 904                                             while (and (= res $SQL_SUCCESS_WITH_INFO)
 905                                                        (equal (sql-state +null-handle-ptr+ +null-handle-ptr+ hstmt)
 906                                                               "01004"))
 907                                             do (setf res (%sql-get-data hstmt column-nr c-type data-ptr
 908                                                                         +max-precision+ out-len-ptr)))
 909                                       (setf str (coerce str 'string))
 910                                       (if (= sql-type $SQL_DECIMAL)
 911                                           (let ((*read-base* 10))
 912                                             (read-from-string str))
 913                                         str)))
 914                     (otherwise
 915                     (let ((str)
 916                           (offset 0)
 917                           (octets (make-array out-len :element-type '(unsigned-byte 8) :initial-element 0)))
 918                       (loop
 919                          do
 920                              (loop for i from 0 to (1- (min out-len +max-precision+))
 921                                 do (setf (aref octets (+ offset i)) (deref-array data-ptr '(:array :unsigned-byte) i))
 922                                 finally (incf offset (1- i)))
 923                          while
 924                            (and (= res $SQL_SUCCESS_WITH_INFO)
 925                                 (> out-len +max-precision+))
 926                          do
 927                            (setf res (%sql-get-data hstmt column-nr c-type data-ptr +max-precision+ out-len-ptr)
 928                                  out-len (deref-pointer out-len-ptr #.$ODBC-LONG-TYPE)))
 929                       (setf str (uffi:octets-to-string octets))
 930                       (if (= sql-type $SQL_DECIMAL)
 931                           (let ((*read-base* 10))
 932                             (read-from-string str))
 933                           str))))))
 934     (setf (deref-pointer out-len-ptr #.$ODBC-LONG-TYPE) #.$SQL_NO_TOTAL) ;; reset the out length for the next row
 935     result))
 936
 937 (def-type c-timestamp-ptr-type (* (:struct sql-c-timestamp)))
 938 (def-type c-time-ptr-type (* (:struct sql-c-time)))
 939 (def-type c-date-ptr-type (* (:struct sql-c-date)))
 940
 941 (defun timestamp-to-universal-time (ptr)
 942   (declare (type c-timestamp-ptr-type ptr))
 943   (values
 944    (encode-universal-time
 945     (get-slot-value ptr 'sql-c-timestamp 'second)
 946     (get-slot-value ptr 'sql-c-timestamp 'minute)
 947     (get-slot-value ptr 'sql-c-timestamp 'hour)
 948     (get-slot-value ptr 'sql-c-timestamp 'day)
 949     (get-slot-value ptr 'sql-c-timestamp 'month)
 950     (get-slot-value ptr 'sql-c-timestamp 'year))
 951    (get-slot-value ptr 'sql-c-timestamp 'fraction)))
 952
 953 (defun universal-time-to-timestamp (time &optional (fraction 0))
 954   (multiple-value-bind (sec min hour day month year)
 955       (decode-universal-time time)
 956     (let ((ptr (allocate-foreign-object 'sql-c-timestamp)))
 957       (setf (get-slot-value ptr 'sql-c-timestamp 'second) sec
 958             (get-slot-value ptr 'sql-c-timestamp 'minute) min
 959             (get-slot-value ptr 'sql-c-timestamp 'hour) hour
 960             (get-slot-value ptr 'sql-c-timestamp 'day) day
 961             (get-slot-value ptr 'sql-c-timestamp 'month) month
 962             (get-slot-value ptr 'sql-c-timestamp 'year) year
 963             (get-slot-value ptr 'sql-c-timestamp 'fraction) fraction)
 964       ptr)))
 965
 966 (defun %put-timestamp (ptr time &optional (fraction 0))
 967   (declare (type c-timestamp-ptr-type ptr))
 968   (multiple-value-bind (sec min hour day month year)
 969       (decode-universal-time time)
 970     (setf (get-slot-value ptr 'sql-c-timestamp 'second) sec
 971           (get-slot-value ptr 'sql-c-timestamp 'minute) min
 972           (get-slot-value ptr 'sql-c-timestamp 'hour) hour
 973           (get-slot-value ptr 'sql-c-timestamp 'day) day
 974           (get-slot-value ptr 'sql-c-timestamp 'month) month
 975           (get-slot-value ptr 'sql-c-timestamp 'year) year
 976           (get-slot-value ptr 'sql-c-timestamp 'fraction) fraction)
 977       ptr))
 978
 979 (defun date-to-universal-time (ptr)
 980   (declare (type c-date-ptr-type ptr))
 981   (encode-universal-time
 982    0 0 0
 983    (get-slot-value ptr 'sql-c-timestamp 'day)
 984    (get-slot-value ptr 'sql-c-timestamp 'month)
 985    (get-slot-value ptr 'sql-c-timestamp 'year)))
 986
 987 (defun time-to-universal-time (ptr)
 988   (declare (type c-time-ptr-type ptr))
 989   (encode-universal-time
 990    (get-slot-value ptr 'sql-c-timestamp 'second)
 991    (get-slot-value ptr 'sql-c-timestamp 'minute)
 992    (get-slot-value ptr 'sql-c-timestamp 'hour)
 993    1 1 0))
 994
 995
 996 ;;; Added by KMR
 997
 998 (defun %set-attr-odbc-version (henv version)
 999   (with-error-handling (:henv henv)
1000       (SQLSetEnvAttr henv $SQL_ATTR_ODBC_VERSION
1001                      (make-pointer version :void) 0)))
1002
1003 (defun %list-tables (hstmt)
1004   (with-error-handling (:hstmt hstmt)
1005     (SQLTables hstmt +null-ptr+ 0 +null-ptr+ 0 +null-ptr+ 0 +null-ptr+ 0)))
1006
1007 (defun %table-statistics (table hstmt &key unique (ensure t))
1008   (with-cstrings ((table-cs table))
1009     (with-error-handling (:hstmt hstmt)
1010       (SQLStatistics
1011        hstmt
1012        +null-ptr+ 0
1013        +null-ptr+ 0
1014        table-cs $SQL_NTS
1015        (if unique $SQL_INDEX_UNIQUE $SQL_INDEX_ALL)
1016        (if ensure $SQL_ENSURE $SQL_QUICK)))))
1017
1018 (defun %list-data-sources (henv)
1019   (let ((dsn (allocate-foreign-string (1+ $SQL_MAX_DSN_LENGTH)))
1020         (desc (allocate-foreign-string 256))
1021         (results nil))
1022     (unwind-protect
1023          (with-foreign-objects ((dsn-len :short)
1024                                 (desc-len :short))
1025            (let ((res (with-error-handling (:henv henv)
1026                         (SQLDataSources henv $SQL_FETCH_FIRST dsn
1027                                         (1+ $SQL_MAX_DSN_LENGTH)
1028                                         dsn-len desc 256 desc-len))))
1029              (when (or (eql res $SQL_SUCCESS)
1030                        (eql res $SQL_SUCCESS_WITH_INFO))
1031                (push (convert-from-foreign-string dsn) results))
1032
1033              (do ((res (with-error-handling (:henv henv)
1034                          (SQLDataSources henv $SQL_FETCH_NEXT dsn
1035                                          (1+ $SQL_MAX_DSN_LENGTH)
1036                                          dsn-len desc 256 desc-len))
1037                        (with-error-handling (:henv henv)
1038                          (SQLDataSources henv $SQL_FETCH_NEXT dsn
1039                                          (1+ $SQL_MAX_DSN_LENGTH)
1040                                          dsn-len desc 256 desc-len))))
1041                  ((not (or (eql res $SQL_SUCCESS)
1042                            (eql res $SQL_SUCCESS_WITH_INFO))))
1043                (push (convert-from-foreign-string dsn) results))))
1044       (progn
1045         (free-foreign-object dsn)
1046         (free-foreign-object desc)))
1047     (nreverse results)))
1048
1049