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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 $this->NumRows;
    00388         }
    00389         else
    00390         {
    00391             # call to this method after an unsuccessful query
    00392             if (!is_resource($this->QueryHandle))
    00393             {
    00394                 return 0;
    00395             }
    00396
    00397             # retrieve number of rows and return to caller
    00398             return mysql_num_rows($this->QueryHandle);
    00399         }
    00400     }
    00401
    00406     function FetchRow()
    00407     {
    00408         # if caching is enabled and query was cached
    00409         if (self::$CachingFlag && $this->GetResultsFromCache)
    00410         {
    00411             # if rows left to return
    00412             if ($this->RowCounter < $this->NumRows)
    00413             {
    00414                 # retrieve row from cache
    00415                 $Result = $this->QueryResults[$this->RowCounter];
    00416
    00417                 # increment row counter
    00418                 $this->RowCounter++;
    00419             }
    00420             else
    00421             {
    00422                 # return nothing
    00423                 $Result = FALSE;
    00424             }
    00425         }
    00426         else
    00427         {
    00428             # call to this method after successful query
    00429             if (is_resource($this->QueryHandle))
    00430             {
    00431                 $Result = mysql_fetch_assoc($this->QueryHandle);
    00432             }
    00433
    00434             # call to this method after unsuccessful query
    00435             else
    00436             {
    00437                 $Result = FALSE;
    00438             }
    00439         }
    00440
    00441         # return row to caller
    00442         return $Result;
    00443     }
    00444
    00450     function FetchRows($NumberOfRows = NULL)
    00451     {
    00452         # assume no rows will be returned
    00453         $Result = array();
    00454
    00455         # for each available row
    00456         $RowsFetched = 0;
    00457         while ((($RowsFetched < $NumberOfRows) || ($NumberOfRows == NULL)) && ($Row = $this->FetchRow()))
    00458         {
    00459             # add row to results
    00460             $Result[] = $Row;
    00461             $RowsFetched++;
    00462         }
    00463
    00464         # return array of rows to caller
    00465         return $Result;
    00466     }
    00467
    00481     function FetchColumn($FieldName, $IndexFieldName = NULL)
    00482     {
    00483         $Array = array();
    00484         while ($Record = $this->FetchRow())
    00485         {
    00486             if ($IndexFieldName != NULL)
    00487             {
    00488                 $Array[$Record[$IndexFieldName]] = $Record[$FieldName];
    00489             }
    00490             else
    00491             {
    00492                 $Array[] = $Record[$FieldName];
    00493             }
    00494         }
    00495         return $Array;
    00496     }
    00497
    00506     function FetchField($FieldName)
    00507     {
    00508         $Record = $this->FetchRow();
    00509         return isset($Record[$FieldName]) ? $Record[$FieldName] : NULL;
    00510     }
    00511
    00519     function LastInsertId($TableName)
    00520     {
    00521         return (int)$this->Query(
    00522                 "SELECT LAST_INSERT_ID() AS InsertId FROM ".$TableName,
    00523                 "InsertId");
    00524     }
    00525
    00537     function UpdateValue(
    00538             $TableName, $FieldName, $NewValue, $Condition, &$CachedRecord)
    00539     {
    00540         # expand condition if supplied
    00541         if ($Condition != NULL) {  $Condition = " WHERE ".$Condition;  }
    00542
    00543         # read cached record from database if not already loaded
    00544         if (!isset($CachedRecord))
    00545         {
    00546             $this->Query("SELECT * FROM ".$TableName." ".$Condition);
    00547             $CachedRecord = $this->FetchRow();
    00548         }
    00549
    00550         # if new value supplied
    00551         if ($NewValue !== DB_NOVALUE)
    00552         {
    00553             # update value in database
    00554             $this->Query("UPDATE $TableName SET $FieldName = "
    00555                     .(($NewValue === NULL) ? "NULL" : "'".addslashes($NewValue)."'")
    00556                     .$Condition);
    00557
    00558             # update value in cached record
    00559             $CachedRecord[$FieldName] = $NewValue;
    00560         }
    00561
    00562         # return value from cached record to caller
    00563         return isset($CachedRecord[$FieldName])
    00564                 ? $CachedRecord[$FieldName] : NULL;
    00565     }
    00566
    00580     function UpdateIntValue(
    00581             $TableName, $FieldName, $NewValue, $Condition, &$CachedRecord)
    00582     {
    00583         return $this->UpdateValue($TableName, $FieldName,
    00584                 (($NewValue === DB_NOVALUE) ? DB_NOVALUE : (int)$NewValue),
    00585                 $Condition, $CachedRecord);
    00586     }
    00587
    00601     function UpdateFloatValue(
    00602             $TableName, $FieldName, $NewValue, $Condition, &$CachedRecord)
    00603     {
    00604         return $this->UpdateValue($TableName, $FieldName,
    00605                 (($NewValue === DB_NOVALUE) ? DB_NOVALUE : (float)$NewValue),
    00606                 $Condition, $CachedRecord);
    00607     }
    00608
    00609     /*@)*/ /* Data Manipulation */ /*@(*/
    00611
    00618     function LogComment($String)
    00619     {
    00620         $this->Query("-- ".$String);
    00621     }
    00622
    00629     function FieldExists($TableName, $FieldName)
    00630     {
    00631         $this->Query("DESC ".$TableName);
    00632         while ($CurrentFieldName = $this->FetchField("Field"))
    00633         {
    00634             if ($CurrentFieldName == $FieldName) {  return TRUE;  }
    00635         }
    00636         return FALSE;
    00637     }
    00638
    00644     static function QueryDebugOutput($NewSetting)
    00645     {
    00646         self::$QueryDebugOutputFlag = $NewSetting;
    00647     }
    00648
    00654     static function NumQueries()
    00655     {
    00656         return self::$QueryCounter;
    00657     }
    00658
    00665     static function NumCacheHits()
    00666     {
    00667         return self::$CachedQueryCounter;
    00668     }
    00669
    00675     static function CacheHitRate()
    00676     {
    00677         if (self::$QueryCounter)
    00678         {
    00679             return (self::$CachedQueryCounter / self::$QueryCounter) * 100;
    00680         }
    00681         else
    00682         {
    00683             return 0;
    00684         }
    00685     }
    00686
    00687     /*@)*/ /* Miscellaneous */
    00688
    00689     # ---- PRIVATE INTERFACE -------------------------------------------------
    00690
    00691     protected $DBUserName;
    00692     protected $DBPassword;
    00693     protected $DBHostName;
    00694     protected $DBName;
    00695
    00696     private $Handle;
    00697     private $QueryHandle;
    00698     private $QueryResults;
    00699     private $RowCounter;
    00700     private $NumRows;
    00701     private $GetResultsFromCache;
    00702     private $ErrorsToIgnore = NULL;
    00703     private $ErrMsg = NULL;
    00704     private $ErrNo = NULL;
    00705
    00706     private static $DisplayErrors = FALSE;
    00707
    00708     private static $GlobalDBUserName;
    00709     private static $GlobalDBPassword;
    00710     private static $GlobalDBHostName;
    00711     private static $GlobalDBName;
    00712
    00713     # debug output flag
    00714     private static $QueryDebugOutputFlag = FALSE;
    00715     # flag for whether caching is turned on
    00716     private static $CachingFlag = TRUE;
    00717     # query result advanced caching flag
    00718     private static $AdvancedCachingFlag = FALSE;
    00719     # global cache for query results
    00720     private static $QueryResultCache = array();
    00721     # stats counters
    00722     private static $QueryCounter = 0;
    00723     private static $CachedQueryCounter = 0;
    00724
    00725     # determine whether SQL statement is one that modifies data
    00726     private function IsReadOnlyStatement($QueryString)
    00727     {
    00728         return preg_match("/^[ ]*SELECT /i", $QueryString) ? TRUE : FALSE;
    00729     }
    00730
    00731     # try to determine table modified by statement (returns FALSE if unknown)
    00732     private function TableModified($QueryString)
    00733     {
    00734         # assume we're not going to be able to determine table
    00735         $TableName = FALSE;
    00736
    00737         # split query into pieces
    00738         $QueryString = trim($QueryString);
    00739         $Words = preg_split("/\s+/", $QueryString);
    00740
    00741         # if INSERT statement
    00742         $WordIndex = 1;
    00743         if (strtoupper($Words[0]) == "INSERT")
    00744         {
    00745             # skip over modifying keywords
    00746             while ((strtoupper($Words[$WordIndex]) == "LOW_PRIORITY")
    00747                     || (strtoupper($Words[$WordIndex]) == "DELAYED")
    00748                     || (strtoupper($Words[$WordIndex]) == "IGNORE")
    00749                     || (strtoupper($Words[$WordIndex]) == "INTO"))
    00750             {
    00751                 $WordIndex++;
    00752             }
    00753
    00754             # next word is table name
    00755             $TableName = $Words[$WordIndex];
    00756         }
    00757         # else if UPDATE statement
    00758         elseif (strtoupper($Words[0]) == "UPDATE")
    00759         {
    00760             # skip over modifying keywords
    00761             while ((strtoupper($Words[$WordIndex]) == "LOW_PRIORITY")
    00762                     || (strtoupper($Words[$WordIndex]) == "IGNORE"))
    00763             {
    00764                 $WordIndex++;
    00765             }
    00766
    00767             # if word following next word is SET
    00768             if (strtoupper($Words[$WordIndex + 1]) == "SET")
    00769             {
    00770                 # next word is table name
    00771                 $TableName = $Words[$WordIndex];
    00772             }
    00773         }
    00774         # else if DELETE statement
    00775         elseif (strtoupper($Words[0]) == "DELETE")
    00776         {
    00777             # skip over modifying keywords
    00778             while ((strtoupper($Words[$WordIndex]) == "LOW_PRIORITY")
    00779                     || (strtoupper($Words[$WordIndex]) == "IGNORE")
    00780                     || (strtoupper($Words[$WordIndex]) == "QUICK"))
    00781             {
    00782                 $WordIndex++;
    00783             }
    00784
    00785             # if next term is FROM
    00786             if (strtoupper($Words[$WordIndex]) == "FROM")
    00787             {
    00788                 # next word is table name
    00789                 $WordIndex++;
    00790                 $TableName = $Words[$WordIndex];
    00791             }
    00792         }
    00793
    00794         # discard table name if it looks at all suspicious
    00795         if ($TableName)
    00796         {
    00797             if (!preg_match("/[a-zA-Z0-9]+/", $TableName))
    00798             {
    00799                 $TableName = FALSE;
    00800             }
    00801         }
    00802
    00803         # return table name (or lack thereof) to caller
    00804         return $TableName;
    00805     }
    00806
    00807     # try to determine tables accessed by statement (returns FALSE if unknown)
    00808     private function TablesAccessed($QueryString)
    00809     {
    00810         # assume we're not going to be able to determine tables
    00811         $TableNames = FALSE;
    00812
    00813         # split query into pieces
    00814         $QueryString = trim($QueryString);
    00815         $Words = preg_split("/\s+/", $QueryString);
    00816         $UQueryString = strtoupper($QueryString);
    00817         $UWords = preg_split("/\s+/", $UQueryString);
    00818
    00819         # if SELECT statement
    00820         if ($UWords[0] == "SELECT")
    00821         {
    00822             # keep going until we hit FROM or last word
    00823             $WordIndex = 1;
    00824             while (($UWords[$WordIndex] != "FROM")
    00825                     && strlen($UWords[$WordIndex]))
    00826             {
    00827                 $WordIndex++;
    00828             }
    00829
    00830             # if we hit FROM
    00831             if ($UWords[$WordIndex] == "FROM")
    00832             {
    00833                 # for each word after FROM
    00834                 $WordIndex++;
    00835                 while (strlen($UWords[$WordIndex]))
    00836                 {
    00837                     # if current word ends with comma
    00838                     if (preg_match("/,$/", $Words[$WordIndex]))
    00839                     {
    00840                         # strip off comma and add word to table name list
    00841                         $TableNames[] = substr($Words[$WordIndex], 0, -1);
    00842                     }
    00843                     else
    00844                     {
    00845                         # add word to table name list
    00846                         $TableNames[] = $Words[$WordIndex];
    00847
    00848                         # if next word is not comma
    00849                         $WordIndex++;
    00850                         if ($Words[$WordIndex] != ",")
    00851                         {
    00852                             # if word begins with comma
    00853                             if (preg_match("/^,/", $Words[$WordIndex]))
    00854                             {
    00855                                 # strip off comma (NOTE: modifies $Words array!)
    00856                                 $Words[$WordIndex] = substr($Words[$WordIndex], 1);
    00857
    00858                                 # decrement index so we start with this word next pass
    00859                                 $WordIndex--;
    00860                             }
    00861                             else
    00862                             {
    00863                                 # stop scanning words (non-basic JOINs not yet handled)
    00864                                 break;
    00865                             }
    00866                         }
    00867                     }
    00868
    00869                     # move to next word
    00870                     $WordIndex++;
    00871                 }
    00872             }
    00873         }
    00874
    00875         # discard table names if they look at all suspicious
    00876         if ($TableNames)
    00877         {
    00878             foreach ($TableNames as $Name)
    00879             {
    00880                 if (!preg_match("/^[a-zA-Z0-9]+$/", $Name))
    00881                 {
    00882                     $TableNames = FALSE;
    00883                     break;
    00884                 }
    00885             }
    00886         }
    00887
    00888         # return table name (or lack thereof) to caller
    00889         return $TableNames;
    00890     }
    00891
    00892     private function RunQuery($QueryString)
    00893     {
    00894         if (self::$QueryDebugOutputFlag) {  print("DB: $QueryString<br>\n");  }
    00895         $this->QueryHandle = mysql_query($QueryString, $this->Handle);
    00896         if (($this->QueryHandle === FALSE) && $this->ErrorsToIgnore)
    00897         {
    00898             foreach ($this->ErrorsToIgnore as $SqlPattern => $ErrMsgPattern)
    00899             {
    00900                 if (preg_match($SqlPattern, $QueryString)
    00901                         && preg_match($ErrMsgPattern, mysql_error()))
    00902                 {
    00903                     $this->QueryHandle = TRUE;
    00904                     break;
    00905                 }
    00906             }
    00907         }
    00908
    00909         if ($this->QueryHandle === FALSE)
    00910         {
    00911             $this->ErrMsg = mysql_error();
    00912             $this->ErrNo = mysql_errno();
    00913             $this->NumRows = 0;
    00914             if (self::$DisplayErrors)
    00915             {
    00916                 print("<b>SQL Error:</b> <i>".$this->ErrMsg
    00917                         ."</i> (".$this->ErrNo.")<br/>\n");
    00918                 print("<b>SQL Statement:</b> <i>"
    00919                         .htmlspecialchars($QueryString)."</i><br/>\n");
    00920             }
    00921         }
    00922         return $this->QueryHandle;
    00923     }
    00924 }
    00925
    00926 # define return values  (numerical values correspond to MySQL error codes)
    00927 define("DB_OKAY",               0);
    00928 define("DB_ERROR",              1);
    00929 define("DB_ACCESSDENIED",       2);
    00930 define("DB_UNKNOWNDB",          3);
    00931 define("DB_UNKNOWNTABLE",       4);
    00932 define("DB_SYNTAXERROR",        5);
    00933 define("DB_DBALREADYEXISTS",    6);
    00934 define("DB_DBDOESNOTEXIST",     7);
    00935 define("DB_DISKFULL",           8);
    00936
    00937 # define value to designate omitted arguments (so DB values can be set to NULL)
    00938 define("DB_NOVALUE", "!-_-_-DB_NOVALUE-_-_-!");
    00939
    00940 # MySQL error code mapping
    00941 $APDBErrorCodeMappings = array(
    00942         1045    => DB_ACCESSDENIED,
    00943         1049    => DB_UNKNOWNDB,
    00944         1046    => DB_UNKNOWNTABLE,
    00945         1064    => DB_SYNTAXERROR,
    00946         1007    => DB_DBALREADYEXISTS,  # ?  (not sure)
    00947         1008    => DB_DBDOESNOTEXIST,   # ?  (not sure)
    00948         1021    => DB_DISKFULL,         # ?  (not sure)
    00949         );
    00950
    00951 ?>

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