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# Axis--Database.php

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    00001 <?PHP
    00002
    00003 #
    00004 #   Axis--Database.php
    00005 #   A Simple SQL Database Abstraction Object
    00006 #
    00007 #   Copyright 1999-2002 Axis Data
    00008 #   This code is free software that can be used or redistributed under the
    00009 #   terms of Version 2 of the GNU General Public License, as published by the
    00010 #   Free Software Foundation (http://www.fsf.org).
    00011 #
    00012 #   Author:  Edward Almasy (almasy@axisdata.com)
    00013 #
    00014 #   Part of the AxisPHP library v1.2.5
    00015 #   For more information see http://www.axisdata.com/AxisPHP/
    00016 #
    00017
    00022 class Database {
    00023
    00024     # ---- PUBLIC INTERFACE --------------------------------------------------
    00025  /*@(*/
    00027
    00039     function Database(
    00040             $UserName = NULL, $Password = NULL, $DatabaseName = NULL, $HostName = NULL)
    00041     {
    00042         # save DB access values
    00043         $this->DBUserName = $UserName ? $UserName : self::$GlobalDBUserName;
    00044         $this->DBPassword = $Password ? $Password : self::$GlobalDBPassword;
    00045         $this->DBHostName = $HostName ? $HostName :
    00046                 (isset(self::$GlobalDBHostName) ? self::$GlobalDBHostName
    00047                     : "localhost");
    00048         $this->DBName = $DatabaseName ? $DatabaseName : self::$GlobalDBName;
    00049
    00050         # open connection to DB server
    00051         $this->Handle = mysql_connect(
    00052                 $this->DBHostName, $this->DBUserName, $this->DBPassword)
    00053                 or die("Could not connect to database: ".mysql_error());
    00054
    00055         # select DB
    00056         mysql_select_db($this->DBName, $this->Handle)
    00057                 or die(mysql_error($this->Handle));
    00058     }
    00059
    00064     function __sleep()
    00065     {
    00066         return array("DBUserName", "DBPassword", "DBHostName", "DBName");
    00067     }
    00071     function __wakeup()
    00072     {
    00073         # open connection to DB server
    00074         $this->Handle = mysql_connect(
    00075                 $this->DBHostName, $this->DBUserName, $this->DBPassword)
    00076                 or die("could not connect to database");
    00077
    00078         # select DB
    00079         mysql_select_db($this->DBName, $this->Handle)
    00080                 or die(mysql_error($this->Handle));
    00081     }
    00090     static function SetGlobalServerInfo($UserName, $Password, $HostName = "localhost")
    00091     {
    00092         self::$GlobalDBUserName = $UserName;
    00093         self::$GlobalDBPassword = $Password;
    00094         self::$GlobalDBHostName = $HostName;
    00095     }
    00096
    00101     static function SetGlobalDatabaseName($DatabaseName)
    00102     {
    00103         self::$GlobalDBName = $DatabaseName;
    00104     }
    00105
    00111     function DBHostName() {  return $this->DBHostName;  }
    00112
    00118     function DBName() {  return $this->DBName;  }
    00119
    00125     function DBUserName() {  return $this->DBUserName;  }
    00126
    00134     static function Caching($NewSetting = NULL)
    00135     {
    00136         # if cache setting has changed
    00137         if (($NewSetting !== NULL) && ($NewSetting != self::$CachingFlag))
    00138         {
    00139             # save new setting
    00140             self::$CachingFlag = $NewSetting;
    00141
    00142             # clear any existing cached results
    00143             self::$QueryResultCache = array();
    00144         }
    00145
    00146         # return current setting to caller
    00147         return self::$CachingFlag;
    00148     }
    00149
    00159     static function AdvancedCaching($NewSetting = NULL)
    00160     {
    00161         if ($NewSetting !== NULL)
    00162         {
    00163             self::$AdvancedCachingFlag = $NewSetting;
    00164         }
    00165         return self::$AdvancedCachingFlag;
    00166     }
    00167
    00182     function SetQueryErrorsToIgnore($ErrorsToIgnore)
    00183     {
    00184         $this->ErrorsToIgnore = $ErrorsToIgnore;
    00185     }
    00186
    00187     /*@)*/ /* Setup/Initialization */ /*@(*/
    00189
    00196     function Query($QueryString, $FieldName = "")
    00197     {
    00198         # if caching is enabled
    00199         if (self::$CachingFlag)
    00200         {
    00201             # if SQL statement is read-only
    00202             if ($this->IsReadOnlyStatement($QueryString))
    00203             {
    00204                 # if we have statement in cache
    00205                 if (isset(self::$QueryResultCache[$QueryString]["NumRows"]))
    00206                 {
    00207                     if (self::$QueryDebugOutputFlag)
    00208                             {  print("DB-C: $QueryString<br>\n");  }
    00209
    00210                     # make sure query result looks okay
    00211                     $this->QueryHandle = TRUE;
    00212
    00213                     # increment cache hit counter
    00214                     self::$CachedQueryCounter++;
    00215
    00216                     # make local copy of results
    00217                     $this->QueryResults = self::$QueryResultCache[$QueryString];
    00218                     $this->NumRows = self::$QueryResultCache[$QueryString]["NumRows"];
    00219
    00220                     # set flag to indicate that results should be retrieved from cache
    00221                     $this->GetResultsFromCache = TRUE;
    00222                 }
    00223                 else
    00224                 {
    00225                     # execute SQL statement
    00226                     $this->QueryHandle = $this->RunQuery($QueryString);
    00227                     if ($this->QueryHandle === FALSE) {  return FALSE;  }
    00228
    00229                     # save number of rows in result
    00230                     $this->NumRows = mysql_num_rows($this->QueryHandle);
    00231
    00232                     # if too many rows to cache
    00233                     if ($this->NumRows >= 50)
    00234                     {
    00235                         # set flag to indicate that query results should not be retrieved from cache
    00236                         $this->GetResultsFromCache = FALSE;
    00237                     }
    00238                     else
    00239                     {
    00240                         # if advanced caching is enabled
    00241                         if (self::$AdvancedCachingFlag)
    00242                         {
    00243                             # save tables accessed by query
    00244                             self::$QueryResultCache[$QueryString]["TablesAccessed"] = $this->TablesAccessed($QueryString);
    00245                         }
    00246
    00247                         # if rows found
    00248                         if ($this->NumRows > 0)
    00249                         {
    00250                             # load query results
    00251                             for ($Row = 0;  $Row < $this->NumRows;  $Row++)
    00252                             {
    00253                                 $this->QueryResults[$Row] = mysql_fetch_assoc($this->QueryHandle);
    00254                             }
    00255
    00256                             # cache query results
    00257                             self::$QueryResultCache[$QueryString] = $this->QueryResults;
    00258                         }
    00259                         else
    00260                         {
    00261                             # clear local query results
    00262                             unset($this->QueryResults);
    00263                         }
    00264
    00265                         # cache number of rows
    00266                         self::$QueryResultCache[$QueryString]["NumRows"] = $this->NumRows;
    00267
    00268                         # set flag to indicate that query results should be retrieved from cache
    00269                         $this->GetResultsFromCache = TRUE;
    00270                     }
    00271                 }
    00272             }
    00273             else
    00274             {
    00275                 # if advanced caching is enabled
    00276                 if (self::$AdvancedCachingFlag)
    00277                 {
    00278                     # if table modified by statement is known
    00279                     $TableModified = $this->TableModified($QueryString);
    00280                     if ($TableModified)
    00281                     {
    00282                         # for each cached query
    00283                         foreach (self::$QueryResultCache as $CachedQueryString => $CachedQueryResult)
    00284                         {
    00285                             # if we know what tables were accessed
    00286                             if ($CachedQueryResult["TablesAccessed"])
    00287                             {
    00288                                 # if tables accessed include the one we may modify
    00289                                 if (in_array($TableModified, $CachedQueryResult["TablesAccessed"]))
    00290                                 {
    00291                                     # clear cached query results
    00292                                     unset($GLOBALS["APDBQueryResultCache"][$CachedQueryString]);
    00293                                 }
    00294                             }
    00295                             else
    00296                             {
    00297                                 # clear cached query results
    00298                                 unset($GLOBALS["APDBQueryResultCache"][$CachedQueryString]);
    00299                             }
    00300                         }
    00301                     }
    00302                     else
    00303                     {
    00304                         # clear entire query result cache
    00305                         self::$QueryResultCache = array();
    00306                     }
    00307                 }
    00308                 else
    00309                 {
    00310                     # clear entire query result cache
    00311                     self::$QueryResultCache = array();
    00312                 }
    00313
    00314                 # execute SQL statement
    00315                 $this->QueryHandle = $this->RunQuery($QueryString);
    00316                 if ($this->QueryHandle === FALSE) {  return FALSE;  }
    00317
    00318                 # set flag to indicate that query results should not be retrieved from cache
    00319                 $this->GetResultsFromCache = FALSE;
    00320             }
    00321
    00322             # reset row counter
    00323             $this->RowCounter = 0;
    00324
    00325             # increment query counter
    00326             self::$QueryCounter++;
    00327         }
    00328         else
    00329         {
    00330             # execute SQL statement
    00331             $this->QueryHandle = $this->RunQuery($QueryString);
    00332             if ($this->QueryHandle === FALSE) {  return FALSE;  }
    00333         }
    00334
    00335         if (($FieldName != "") && ($this->QueryHandle != FALSE))
    00336         {
    00337             return $this->FetchField($FieldName);
    00338         }
    00339         else
    00340         {
    00341             return $this->QueryHandle;
    00342         }
    00343     }
    00344
    00350     function QueryErrMsg()
    00351     {
    00352         return $this->ErrMsg;
    00353     }
    00354
    00360     function QueryErrNo()
    00361     {
    00362         return $this->ErrNo;
    00363     }
    00364
    00371     static function DisplayQueryErrors($NewValue = NULL)
    00372     {
    00373         if ($NewValue !== NULL) {  self::$DisplayErrors = $NewValue;  }
    00374         return self::$DisplayErrors;
    00375     }
    00376
    00381     function NumRowsSelected()
    00382     {
    00383         # if caching is enabled and query was cached
    00384         if (self::$CachingFlag && $this->GetResultsFromCache)
    00385         {
    00386             # return cached number of rows to caller
    00387             return $this->NumRows;
    00388         }
    00389         else
    00390         {
    00391             # retrieve number of rows and return to caller
    00392             return mysql_num_rows($this->QueryHandle);
    00393         }
    00394     }
    00395
    00400     function FetchRow()
    00401     {
    00402         # if caching is enabled and query was cached
    00403         if (self::$CachingFlag && $this->GetResultsFromCache)
    00404         {
    00405             # if rows left to return
    00406             if ($this->RowCounter < $this->NumRows)
    00407             {
    00408                 # retrieve row from cache
    00409                 $Result = $this->QueryResults[$this->RowCounter];
    00410
    00411                 # increment row counter
    00412                 $this->RowCounter++;
    00413             }
    00414             else
    00415             {
    00416                 # return nothing
    00417                 $Result = FALSE;
    00418             }
    00419         }
    00420         else
    00421         {
    00422             # retrieve row from DB
    00423             $Result = mysql_fetch_assoc($this->QueryHandle);
    00424         }
    00425
    00426         # return row to caller
    00427         return $Result;
    00428     }
    00429
    00435     function FetchRows($NumberOfRows = NULL)
    00436     {
    00437         # assume no rows will be returned
    00438         $Result = array();
    00439
    00440         # for each available row
    00441         $RowsFetched = 0;
    00442         while ((($RowsFetched < $NumberOfRows) || ($NumberOfRows == NULL)) && ($Row = $this->FetchRow()))
    00443         {
    00444             # add row to results
    00445             $Result[] = $Row;
    00446             $RowsFetched++;
    00447         }
    00448
    00449         # return array of rows to caller
    00450         return $Result;
    00451     }
    00452
    00466     function FetchColumn($FieldName, $IndexFieldName = NULL)
    00467     {
    00468         $Array = array();
    00469         while ($Record = $this->FetchRow())
    00470         {
    00471             if ($IndexFieldName != NULL)
    00472             {
    00473                 $Array[$Record[$IndexFieldName]] = $Record[$FieldName];
    00474             }
    00475             else
    00476             {
    00477                 $Array[] = $Record[$FieldName];
    00478             }
    00479         }
    00480         return $Array;
    00481     }
    00482
    00491     function FetchField($FieldName)
    00492     {
    00493         $Record = $this->FetchRow();
    00494         return isset($Record[$FieldName]) ? $Record[$FieldName] : NULL;
    00495     }
    00496
    00504     function LastInsertId($TableName)
    00505     {
    00506         return (int)$this->Query(
    00507                 "SELECT LAST_INSERT_ID() AS InsertId FROM ".$TableName,
    00508                 "InsertId");
    00509     }
    00510
    00522     function UpdateValue(
    00523             $TableName, $FieldName, $NewValue, $Condition, &$CachedRecord)
    00524     {
    00525         # expand condition if supplied
    00526         if ($Condition != NULL) {  $Condition = " WHERE ".$Condition;  }
    00527
    00528         # read cached record from database if not already loaded
    00529         if (!isset($CachedRecord))
    00530         {
    00531             $this->Query("SELECT * FROM ".$TableName." ".$Condition);
    00532             $CachedRecord = $this->FetchRow();
    00533         }
    00534
    00535         # if new value supplied
    00536         if ($NewValue !== DB_NOVALUE)
    00537         {
    00538             # update value in database
    00539             $this->Query("UPDATE $TableName SET $FieldName = "
    00540                     .(($NewValue === NULL) ? "NULL" : "'".addslashes($NewValue)."'")
    00541                     .$Condition);
    00542
    00543             # update value in cached record
    00544             $CachedRecord[$FieldName] = $NewValue;
    00545         }
    00546
    00547         # return value from cached record to caller
    00548         return isset($CachedRecord[$FieldName])
    00549                 ? $CachedRecord[$FieldName] : NULL;
    00550     }
    00551
    00552     /*@)*/ /* Data Manipulation */ /*@(*/
    00554
    00561     function LogComment($String)
    00562     {
    00563         $this->Query("-- ".$String);
    00564     }
    00565
    00572     function FieldExists($TableName, $FieldName)
    00573     {
    00574         $this->Query("DESC ".$TableName);
    00575         while ($CurrentFieldName = $this->FetchField("Field"))
    00576         {
    00577             if ($CurrentFieldName == $FieldName) {  return TRUE;  }
    00578         }
    00579         return FALSE;
    00580     }
    00581
    00587     static function QueryDebugOutput($NewSetting)
    00588     {
    00589         self::$QueryDebugOutputFlag = $NewSetting;
    00590     }
    00591
    00597     static function NumQueries()
    00598     {
    00599         return self::$QueryCounter;
    00600     }
    00601
    00608     static function NumCacheHits()
    00609     {
    00610         return self::$CachedQueryCounter;
    00611     }
    00612
    00618     static function CacheHitRate()
    00619     {
    00620         if (self::$QueryCounter)
    00621         {
    00622             return (self::$CachedQueryCounter / self::$QueryCounter) * 100;
    00623         }
    00624         else
    00625         {
    00626             return 0;
    00627         }
    00628     }
    00629
    00630     /*@)*/ /* Miscellaneous */
    00631
    00632     # ---- PRIVATE INTERFACE -------------------------------------------------
    00633
    00634     protected $DBUserName;
    00635     protected $DBPassword;
    00636     protected $DBHostName;
    00637     protected $DBName;
    00638
    00639     private $Handle;
    00640     private $QueryHandle;
    00641     private $QueryResults;
    00642     private $RowCounter;
    00643     private $NumRows;
    00644     private $GetResultsFromCache;
    00645     private $ErrorsToIgnore = NULL;
    00646     private $ErrMsg = NULL;
    00647     private $ErrNo = NULL;
    00648
    00649     private static $DisplayErrors = FALSE;
    00650
    00651     private static $GlobalDBUserName;
    00652     private static $GlobalDBPassword;
    00653     private static $GlobalDBHostName;
    00654     private static $GlobalDBName;
    00655
    00656     # debug output flag
    00657     private static $QueryDebugOutputFlag = FALSE;
    00658     # flag for whether caching is turned on
    00659     private static $CachingFlag = TRUE;
    00660     # query result advanced caching flag
    00661     private static $AdvancedCachingFlag = FALSE;
    00662     # global cache for query results
    00663     private static $QueryResultCache = array();
    00664     # stats counters
    00665     private static $QueryCounter = 0;
    00666     private static $CachedQueryCounter = 0;
    00667
    00668     # determine whether SQL statement is one that modifies data
    00669     private function IsReadOnlyStatement($QueryString)
    00670     {
    00671         return preg_match("/^[ ]*SELECT /i", $QueryString) ? TRUE : FALSE;
    00672     }
    00673
    00674     # try to determine table modified by statement (returns FALSE if unknown)
    00675     private function TableModified($QueryString)
    00676     {
    00677         # assume we're not going to be able to determine table
    00678         $TableName = FALSE;
    00679
    00680         # split query into pieces
    00681         $QueryString = trim($QueryString);
    00682         $Words = preg_split("/\s+/", $QueryString);
    00683
    00684         # if INSERT statement
    00685         $WordIndex = 1;
    00686         if (strtoupper($Words[0]) == "INSERT")
    00687         {
    00688             # skip over modifying keywords
    00689             while ((strtoupper($Words[$WordIndex]) == "LOW_PRIORITY")
    00690                     || (strtoupper($Words[$WordIndex]) == "DELAYED")
    00691                     || (strtoupper($Words[$WordIndex]) == "IGNORE")
    00692                     || (strtoupper($Words[$WordIndex]) == "INTO"))
    00693             {
    00694                 $WordIndex++;
    00695             }
    00696
    00697             # next word is table name
    00698             $TableName = $Words[$WordIndex];
    00699         }
    00700         # else if UPDATE statement
    00701         elseif (strtoupper($Words[0]) == "UPDATE")
    00702         {
    00703             # skip over modifying keywords
    00704             while ((strtoupper($Words[$WordIndex]) == "LOW_PRIORITY")
    00705                     || (strtoupper($Words[$WordIndex]) == "IGNORE"))
    00706             {
    00707                 $WordIndex++;
    00708             }
    00709
    00710             # if word following next word is SET
    00711             if (strtoupper($Words[$WordIndex + 1]) == "SET")
    00712             {
    00713                 # next word is table name
    00714                 $TableName = $Words[$WordIndex];
    00715             }
    00716         }
    00717         # else if DELETE statement
    00718         elseif (strtoupper($Words[0]) == "DELETE")
    00719         {
    00720             # skip over modifying keywords
    00721             while ((strtoupper($Words[$WordIndex]) == "LOW_PRIORITY")
    00722                     || (strtoupper($Words[$WordIndex]) == "IGNORE")
    00723                     || (strtoupper($Words[$WordIndex]) == "QUICK"))
    00724             {
    00725                 $WordIndex++;
    00726             }
    00727
    00728             # if next term is FROM
    00729             if (strtoupper($Words[$WordIndex]) == "FROM")
    00730             {
    00731                 # next word is table name
    00732                 $WordIndex++;
    00733                 $TableName = $Words[$WordIndex];
    00734             }
    00735         }
    00736
    00737         # discard table name if it looks at all suspicious
    00738         if ($TableName)
    00739         {
    00740             if (!preg_match("/[a-zA-Z0-9]+/", $TableName))
    00741             {
    00742                 $TableName = FALSE;
    00743             }
    00744         }
    00745
    00746         # return table name (or lack thereof) to caller
    00747         return $TableName;
    00748     }
    00749
    00750     # try to determine tables accessed by statement (returns FALSE if unknown)
    00751     private function TablesAccessed($QueryString)
    00752     {
    00753         # assume we're not going to be able to determine tables
    00754         $TableNames = FALSE;
    00755
    00756         # split query into pieces
    00757         $QueryString = trim($QueryString);
    00758         $Words = preg_split("/\s+/", $QueryString);
    00759         $UQueryString = strtoupper($QueryString);
    00760         $UWords = preg_split("/\s+/", $UQueryString);
    00761
    00762         # if SELECT statement
    00763         if ($UWords[0] == "SELECT")
    00764         {
    00765             # keep going until we hit FROM or last word
    00766             $WordIndex = 1;
    00767             while (($UWords[$WordIndex] != "FROM")
    00768                     && strlen($UWords[$WordIndex]))
    00769             {
    00770                 $WordIndex++;
    00771             }
    00772
    00773             # if we hit FROM
    00774             if ($UWords[$WordIndex] == "FROM")
    00775             {
    00776                 # for each word after FROM
    00777                 $WordIndex++;
    00778                 while (strlen($UWords[$WordIndex]))
    00779                 {
    00780                     # if current word ends with comma
    00781                     if (preg_match("/,$/", $Words[$WordIndex]))
    00782                     {
    00783                         # strip off comma and add word to table name list
    00784                         $TableNames[] = substr($Words[$WordIndex], 0, -1);
    00785                     }
    00786                     else
    00787                     {
    00788                         # add word to table name list
    00789                         $TableNames[] = $Words[$WordIndex];
    00790
    00791                         # if next word is not comma
    00792                         $WordIndex++;
    00793                         if ($Words[$WordIndex] != ",")
    00794                         {
    00795                             # if word begins with comma
    00796                             if (preg_match("/^,/", $Words[$WordIndex]))
    00797                             {
    00798                                 # strip off comma (NOTE: modifies $Words array!)
    00799                                 $Words[$WordIndex] = substr($Words[$WordIndex], 1);
    00800
    00801                                 # decrement index so we start with this word next pass
    00802                                 $WordIndex--;
    00803                             }
    00804                             else
    00805                             {
    00806                                 # stop scanning words (non-basic JOINs not yet handled)
    00807                                 break;
    00808                             }
    00809                         }
    00810                     }
    00811
    00812                     # move to next word
    00813                     $WordIndex++;
    00814                 }
    00815             }
    00816         }
    00817
    00818         # discard table names if they look at all suspicious
    00819         if ($TableNames)
    00820         {
    00821             foreach ($TableNames as $Name)
    00822             {
    00823                 if (!preg_match("/^[a-zA-Z0-9]+$/", $Name))
    00824                 {
    00825                     $TableNames = FALSE;
    00826                     break;
    00827                 }
    00828             }
    00829         }
    00830
    00831         # return table name (or lack thereof) to caller
    00832         return $TableNames;
    00833     }
    00834
    00835     private function RunQuery($QueryString)
    00836     {
    00837         if (self::$QueryDebugOutputFlag) {  print("DB: $QueryString<br>\n");  }
    00838         $this->QueryHandle = mysql_query($QueryString, $this->Handle);
    00839         if (($this->QueryHandle === FALSE) && $this->ErrorsToIgnore)
    00840         {
    00841             foreach ($this->ErrorsToIgnore as $SqlPattern => $ErrMsgPattern)
    00842             {
    00843                 if (preg_match($SqlPattern, $QueryString)
    00844                         && preg_match($ErrMsgPattern, mysql_error()))
    00845                 {
    00846                     $this->QueryHandle = TRUE;
    00847                     break;
    00848                 }
    00849             }
    00850         }
    00851
    00852         if ($this->QueryHandle === FALSE)
    00853         {
    00854             $this->ErrMsg = mysql_error();
    00855             $this->ErrNo = mysql_errno();
    00856             $this->NumRows = 0;
    00857             if (self::$DisplayErrors)
    00858             {
    00859                 print("<b>SQL Error:</b> <i>".$this->ErrMsg
    00860                         ."</i> (".$this->ErrNo.")<br/>\n");
    00861                 print("<b>SQL Statement:</b> <i>"
    00862                         .htmlspecialchars($QueryString)."</i><br/>\n");
    00863             }
    00864         }
    00865         return $this->QueryHandle;
    00866     }
    00867 }
    00868
    00869 # define return values  (numerical values correspond to MySQL error codes)
    00870 define("DB_OKAY",               0);
    00871 define("DB_ERROR",              1);
    00872 define("DB_ACCESSDENIED",       2);
    00873 define("DB_UNKNOWNDB",          3);
    00874 define("DB_UNKNOWNTABLE",       4);
    00875 define("DB_SYNTAXERROR",        5);
    00876 define("DB_DBALREADYEXISTS",    6);
    00877 define("DB_DBDOESNOTEXIST",     7);
    00878 define("DB_DISKFULL",           8);
    00879
    00880 # define value to designate omitted arguments (so DB values can be set to NULL)
    00881 define("DB_NOVALUE", "!-_-_-DB_NOVALUE-_-_-!");
    00882
    00883 # MySQL error code mapping
    00884 $APDBErrorCodeMappings = array(
    00885         1045    => DB_ACCESSDENIED,
    00886         1049    => DB_UNKNOWNDB,
    00887         1046    => DB_UNKNOWNTABLE,
    00888         1064    => DB_SYNTAXERROR,
    00889         1007    => DB_DBALREADYEXISTS,  # ?  (not sure)
    00890         1008    => DB_DBDOESNOTEXIST,   # ?  (not sure)
    00891         1021    => DB_DISKFULL,         # ?  (not sure)
    00892         );
    00893
    00894 ?>

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