PHP 网络应用程序

Question

我是 php 新手，我正在尝试开发一些应用程序，所以我完成了其中一个应用程序，当我启动它时，我收到了此错误。电脑还新安装了操作系统，我首先安装的是xampp

Notice: Trying to get property of non-object in
C:\xampp\htdocs\FINS\adodb5\drivers\adodb-ado5.inc.php on line 347
C:\xampp\htdocs\FINS\adodb5\drivers\adodb-ado5.inc.php on line 348

以下是错误代码。请帮忙。提前致谢。这就是问题的根源，但我还包含了整个代码，以防万一需要。我已经很感激你的举动了

问题代码

{
    $errc = $this->_connectionID->Errors;
    if ($errc->Count == 0) return 0;
    $err = $errc->Item($errc->Count-1);
    return $err->NativeError;
}

全部代码

<?php
/* 
V5.11 5 May 2010   (c) 2000-2010 John Lim (jlim#natsoft.com). All rights reserved.
  Released under both BSD license and Lesser GPL library license. 
  Whenever there is any discrepancy between the two licenses, 
  the BSD license will take precedence. 
Set tabs to 4 for best viewing.

  Latest version is available at http://adodb.sourceforge.net

    Microsoft ADO data driver. Requires ADO. Works only on MS Windows. PHP5 compat version.
*/

// security - hide paths
if (!defined('ADODB_DIR')) die();

define("_ADODB_ADO_LAYER", 1 );
/*--------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------*/


class ADODB_ado extends ADOConnection {
    var $databaseType = "ado";  
    var $_bindInputArray = false;
    var $fmtDate = "'Y-m-d'";
    var $fmtTimeStamp = "'Y-m-d, h:i:sA'";
    var $replaceQuote = "''"; // string to use to replace quotes
    var $dataProvider = "ado";  
    var $hasAffectedRows = true;
    var $adoParameterType = 201; // 201 = long varchar, 203=long wide varchar, 205 = long varbinary
    var $_affectedRows = false;
    var $_thisTransactions;
    var $_cursor_type = 3; // 3=adOpenStatic,0=adOpenForwardOnly,1=adOpenKeyset,2=adOpenDynamic
    var $_cursor_location = 3; // 2=adUseServer, 3 = adUseClient;
    var $_lock_type = -1;
    var $_execute_option = -1;
    var $poorAffectedRows = true; 
    var $charPage;

    function ADODB_ado() 
    {   
        $this->_affectedRows = new VARIANT;
    }

    function ServerInfo()
    {
        if (!empty($this->_connectionID)) $desc = $this->_connectionID->provider;
        return array('description' => $desc, 'version' => '');
    }

    function _affectedrows()
    {
        if (PHP_VERSION >= 5) return $this->_affectedRows;

        return $this->_affectedRows->value;
    }

    // you can also pass a connection string like this:
    //
    // $DB->Connect('USER ID=sa;PASSWORD=pwd;SERVER=mangrove;DATABASE=ai',false,false,'SQLOLEDB');
    function _connect($argHostname, $argUsername, $argPassword,$argDBorProvider, $argProvider= '')
    {
    // two modes
    //  -   if $argProvider is empty, we assume that $argDBorProvider holds provider -- this is for backward compat
    //  -   if $argProvider is not empty, then $argDBorProvider holds db


         if ($argProvider) {
            $argDatabasename = $argDBorProvider;
         } else {
            $argDatabasename = '';
            if ($argDBorProvider) $argProvider = $argDBorProvider;
            else if (stripos($argHostname,'PROVIDER') === false) /* full conn string is not in $argHostname */ 
                $argProvider = 'MSDASQL';
        }


        try {
        $u = 'UID';
        $p = 'PWD';

        if (!empty($this->charPage))
            $dbc = new COM('ADODB.Connection',null,$this->charPage);
        else
            $dbc = new COM('ADODB.Connection');

        if (! $dbc) return false;

        /* special support if provider is mssql or access */
        if ($argProvider=='mssql') {
            $u = 'User Id';  //User parameter name for OLEDB
            $p = 'Password'; 
            $argProvider = "SQLOLEDB"; // SQL Server Provider

            // not yet
            //if ($argDatabasename) $argHostname .= ";Initial Catalog=$argDatabasename";

            //use trusted conection for SQL if username not specified
            if (!$argUsername) $argHostname .= ";Trusted_Connection=Yes";
        } else if ($argProvider=='access')
            $argProvider = "Microsoft.Jet.OLEDB.4.0"; // Microsoft Jet Provider

        if ($argProvider) $dbc->Provider = $argProvider;    

        if ($argProvider) $argHostname = "PROVIDER=$argProvider;DRIVER={SQL Server};SERVER=$argHostname";   


        if ($argDatabasename) $argHostname .= ";DATABASE=$argDatabasename";     
        if ($argUsername) $argHostname .= ";$u=$argUsername";
        if ($argPassword)$argHostname .= ";$p=$argPassword";

        if ($this->debug) ADOConnection::outp( "Host=".$argHostname."<BR>\n version=$dbc->version");
        // @ added below for php 4.0.1 and earlier
        @$dbc->Open((string) $argHostname);

        $this->_connectionID = $dbc;

        $dbc->CursorLocation = $this->_cursor_location;
        return  $dbc->State > 0;
        } catch (exception $e) {
            if ($this->debug) echo "<pre>",$argHostname,"\n",$e,"</pre>\n";
        }

        return false;
    }

    // returns true or false
    function _pconnect($argHostname, $argUsername, $argPassword, $argProvider='MSDASQL')
    {
        return $this->_connect($argHostname,$argUsername,$argPassword,$argProvider);
    }   

/*
    adSchemaCatalogs    = 1,
    adSchemaCharacterSets   = 2,
    adSchemaCollations  = 3,
    adSchemaColumns = 4,
    adSchemaCheckConstraints    = 5,
    adSchemaConstraintColumnUsage   = 6,
    adSchemaConstraintTableUsage    = 7,
    adSchemaKeyColumnUsage  = 8,
    adSchemaReferentialContraints   = 9,
    adSchemaTableConstraints    = 10,
    adSchemaColumnsDomainUsage  = 11,
    adSchemaIndexes = 12,
    adSchemaColumnPrivileges    = 13,
    adSchemaTablePrivileges = 14,
    adSchemaUsagePrivileges = 15,
    adSchemaProcedures  = 16,
    adSchemaSchemata    = 17,
    adSchemaSQLLanguages    = 18,
    adSchemaStatistics  = 19,
    adSchemaTables  = 20,
    adSchemaTranslations    = 21,
    adSchemaProviderTypes   = 22,
    adSchemaViews   = 23,
    adSchemaViewColumnUsage = 24,
    adSchemaViewTableUsage  = 25,
    adSchemaProcedureParameters = 26,
    adSchemaForeignKeys = 27,
    adSchemaPrimaryKeys = 28,
    adSchemaProcedureColumns    = 29,
    adSchemaDBInfoKeywords  = 30,
    adSchemaDBInfoLiterals  = 31,
    adSchemaCubes   = 32,
    adSchemaDimensions  = 33,
    adSchemaHierarchies = 34,
    adSchemaLevels  = 35,
    adSchemaMeasures    = 36,
    adSchemaProperties  = 37,
    adSchemaMembers = 38

*/

    function MetaTables()
    {
        $arr= array();
        $dbc = $this->_connectionID;

        $adors=@$dbc->OpenSchema(20);//tables
        if ($adors){
            $f = $adors->Fields(2);//table/view name
            $t = $adors->Fields(3);//table type
            while (!$adors->EOF){
                $tt=substr($t->value,0,6);
                if ($tt!='SYSTEM' && $tt !='ACCESS')
                    $arr[]=$f->value;
                //print $f->value . ' ' . $t->value.'<br>';
                $adors->MoveNext();
            }
            $adors->Close();
        }

        return $arr;
    }

    function MetaColumns($table, $normalize=true)
    {
        $table = strtoupper($table);
        $arr= array();
        $dbc = $this->_connectionID;

        $adors=@$dbc->OpenSchema(4);//tables

        if ($adors){
            $t = $adors->Fields(2);//table/view name
            while (!$adors->EOF){


                if (strtoupper($t->Value) == $table) {

                    $fld = new ADOFieldObject();
                    $c = $adors->Fields(3);
                    $fld->name = $c->Value;
                    $fld->type = 'CHAR'; // cannot discover type in ADO!
                    $fld->max_length = -1;
                    $arr[strtoupper($fld->name)]=$fld;
                }

                $adors->MoveNext();
            }
            $adors->Close();
        }

        return $arr;
    }

    /* returns queryID or false */
    function _query($sql,$inputarr=false) 
    {
        try { // In PHP5, all COM errors are exceptions, so to maintain old behaviour...

        $dbc = $this->_connectionID;

    //  return rs   

        $false = false;

        if ($inputarr) {

            if (!empty($this->charPage))
                $oCmd = new COM('ADODB.Command',null,$this->charPage);
            else
                $oCmd = new COM('ADODB.Command');
            $oCmd->ActiveConnection = $dbc;
            $oCmd->CommandText = $sql;
            $oCmd->CommandType = 1;

            while(list(, $val) = each($inputarr)) {
                $type = gettype($val);
                $len=strlen($val);
                if ($type == 'boolean')
                    $this->adoParameterType = 11;
                else if ($type == 'integer')
                    $this->adoParameterType = 3;
                else if ($type == 'double')
                    $this->adoParameterType = 5;
                elseif ($type == 'string')
                    $this->adoParameterType = 202;
                else if (($val === null) || (!defined($val)))
                    $len=1;
                else
                    $this->adoParameterType = 130;

                // name, type, direction 1 = input, len,
                $p = $oCmd->CreateParameter('name',$this->adoParameterType,1,$len,$val);

                $oCmd->Parameters->Append($p);
            }

            $p = false;
            $rs = $oCmd->Execute();
            $e = $dbc->Errors;
            if ($dbc->Errors->Count > 0) return $false;
            return $rs;
        }

        $rs = @$dbc->Execute($sql,$this->_affectedRows, $this->_execute_option);

        if ($dbc->Errors->Count > 0) return $false;
        if (! $rs) return $false;

        if ($rs->State == 0) {
            $true = true;
            return $true; // 0 = adStateClosed means no records returned
        }
        return $rs;

        } catch (exception $e) {

        }
        return $false;
    }


    function BeginTrans() 
    { 
        if ($this->transOff) return true;

        if (isset($this->_thisTransactions))
            if (!$this->_thisTransactions) return false;
        else {
            $o = $this->_connectionID->Properties("Transaction DDL");
            $this->_thisTransactions = $o ? true : false;
            if (!$o) return false;
        }
        @$this->_connectionID->BeginTrans();
        $this->transCnt += 1;
        return true;
    }
    function CommitTrans($ok=true) 
    { 
        if (!$ok) return $this->RollbackTrans();
        if ($this->transOff) return true;

        @$this->_connectionID->CommitTrans();
        if ($this->transCnt) @$this->transCnt -= 1;
        return true;
    }
    function RollbackTrans() {
        if ($this->transOff) return true;
        @$this->_connectionID->RollbackTrans();
        if ($this->transCnt) @$this->transCnt -= 1;
        return true;
    }

    /*  Returns: the last error message from previous database operation    */  

    function ErrorMsg() 
    {
        if (!$this->_connectionID) return "No connection established";
        $errmsg = '';

        try {
            $errc = $this->_connectionID->Errors;
            if (!$errc) return "No Errors object found";
            if ($errc->Count == 0) return '';
            $err = $errc->Item($errc->Count-1);
            $errmsg = $err->Description;
        }catch(exception $e) {
        }
        return $errmsg;
    }

    function ErrorNo() 
    {
        $errc = $this->_connectionID->Errors;
        if ($errc->Count == 0) return 0;
        $err = $errc->Item($errc->Count-1);
        return $err->NativeError;
    }

    // returns true or false
    function _close()
    {
        if ($this->_connectionID) $this->_connectionID->Close();
        $this->_connectionID = false;
        return true;
    }


}

/*--------------------------------------------------------------------------------------
     Class Name: Recordset
--------------------------------------------------------------------------------------*/

class ADORecordSet_ado extends ADORecordSet {   

    var $bind = false;
    var $databaseType = "ado";  
    var $dataProvider = "ado";  
    var $_tarr = false; // caches the types
    var $_flds; // and field objects
    var $canSeek = true;
    var $hideErrors = true;

    function ADORecordSet_ado($id,$mode=false)
    {
        if ($mode === false) { 
            global $ADODB_FETCH_MODE;
            $mode = $ADODB_FETCH_MODE;
        }
        $this->fetchMode = $mode;
        return $this->ADORecordSet($id,$mode);
    }


    // returns the field object
    function FetchField($fieldOffset = -1) {
        $off=$fieldOffset+1; // offsets begin at 1

        $o= new ADOFieldObject();
        $rs = $this->_queryID;
        if (!$rs) return false;

        $f = $rs->Fields($fieldOffset);
        $o->name = $f->Name;
        $t = $f->Type;
        $o->type = $this->MetaType($t);
        $o->max_length = $f->DefinedSize;
        $o->ado_type = $t;


        //print "off=$off name=$o->name type=$o->type len=$o->max_length<br>";
        return $o;
    }

    /* Use associative array to get fields array */
    function Fields($colname)
    {
        if ($this->fetchMode & ADODB_FETCH_ASSOC) return $this->fields[$colname];
        if (!$this->bind) {
            $this->bind = array();
            for ($i=0; $i < $this->_numOfFields; $i++) {
                $o = $this->FetchField($i);
                $this->bind[strtoupper($o->name)] = $i;
            }
        }

         return $this->fields[$this->bind[strtoupper($colname)]];
    }


    function _initrs()
    {
        $rs = $this->_queryID;

        try {
            $this->_numOfRows = $rs->RecordCount;
        } catch (Exception $e) {
            $this->_numOfRows = -1;
        }
        $f = $rs->Fields;
        $this->_numOfFields = $f->Count;
    }


     // should only be used to move forward as we normally use forward-only cursors
    function _seek($row)
    {
       $rs = $this->_queryID; 
        // absoluteposition doesn't work -- my maths is wrong ?
        //  $rs->AbsolutePosition->$row-2;
        //  return true;
        if ($this->_currentRow > $row) return false;
        @$rs->Move((integer)$row - $this->_currentRow-1); //adBookmarkFirst
        return true;
    }

/*
    OLEDB types

     enum DBTYPEENUM
    {   DBTYPE_EMPTY    = 0,
    DBTYPE_NULL = 1,
    DBTYPE_I2   = 2,
    DBTYPE_I4   = 3,
    DBTYPE_R4   = 4,
    DBTYPE_R8   = 5,
    DBTYPE_CY   = 6,
    DBTYPE_DATE = 7,
    DBTYPE_BSTR = 8,
    DBTYPE_IDISPATCH    = 9,
    DBTYPE_ERROR    = 10,
    DBTYPE_BOOL = 11,
    DBTYPE_VARIANT  = 12,
    DBTYPE_IUNKNOWN = 13,
    DBTYPE_DECIMAL  = 14,
    DBTYPE_UI1  = 17,
    DBTYPE_ARRAY    = 0x2000,
    DBTYPE_BYREF    = 0x4000,
    DBTYPE_I1   = 16,
    DBTYPE_UI2  = 18,
    DBTYPE_UI4  = 19,
    DBTYPE_I8   = 20,
    DBTYPE_UI8  = 21,
    DBTYPE_GUID = 72,
    DBTYPE_VECTOR   = 0x1000,
    DBTYPE_RESERVED = 0x8000,
    DBTYPE_BYTES    = 128,
    DBTYPE_STR  = 129,
    DBTYPE_WSTR = 130,
    DBTYPE_NUMERIC  = 131,
    DBTYPE_UDT  = 132,
    DBTYPE_DBDATE   = 133,
    DBTYPE_DBTIME   = 134,
    DBTYPE_DBTIMESTAMP  = 135

    ADO Types

    adEmpty = 0,
    adTinyInt   = 16,
    adSmallInt  = 2,
    adInteger   = 3,
    adBigInt    = 20,
    adUnsignedTinyInt   = 17,
    adUnsignedSmallInt  = 18,
    adUnsignedInt   = 19,
    adUnsignedBigInt    = 21,
    adSingle    = 4,
    adDouble    = 5,
    adCurrency  = 6,
    adDecimal   = 14,
    adNumeric   = 131,
    adBoolean   = 11,
    adError = 10,
    adUserDefined   = 132,
    adVariant   = 12,
    adIDispatch = 9,
    adIUnknown  = 13,   
    adGUID  = 72,
    adDate  = 7,
    adDBDate    = 133,
    adDBTime    = 134,
    adDBTimeStamp   = 135,
    adBSTR  = 8,
    adChar  = 129,
    adVarChar   = 200,
    adLongVarChar   = 201,
    adWChar = 130,
    adVarWChar  = 202,
    adLongVarWChar  = 203,
    adBinary    = 128,
    adVarBinary = 204,
    adLongVarBinary = 205,
    adChapter   = 136,
    adFileTime  = 64,
    adDBFileTime    = 137,
    adPropVariant   = 138,
    adVarNumeric    = 139
*/
    function MetaType($t,$len=-1,$fieldobj=false)
    {
        if (is_object($t)) {
            $fieldobj = $t;
            $t = $fieldobj->type;
            $len = $fieldobj->max_length;
        }

        if (!is_numeric($t)) return $t;

        switch ($t) {
        case 0:
        case 12: // variant
        case 8: // bstr
        case 129: //char
        case 130: //wc
        case 200: // varc
        case 202:// varWC
        case 128: // bin
        case 204: // varBin
        case 72: // guid
            if ($len <= $this->blobSize) return 'C';

        case 201:
        case 203:
            return 'X';
        case 128:
        case 204:
        case 205:
             return 'B';
        case 7:
        case 133: return 'D';

        case 134:
        case 135: return 'T';

        case 11: return 'L';

        case 16://  adTinyInt   = 16,
        case 2://adSmallInt = 2,
        case 3://adInteger  = 3,
        case 4://adBigInt   = 20,
        case 17://adUnsignedTinyInt = 17,
        case 18://adUnsignedSmallInt    = 18,
        case 19://adUnsignedInt = 19,
        case 20://adUnsignedBigInt  = 21,
            return 'I';
        default: return 'N';
        }
    }

    // time stamp not supported yet
    function _fetch()
    {   
        $rs = $this->_queryID;
        if (!$rs or $rs->EOF) {
            $this->fields = false;
            return false;
        }
        $this->fields = array();

        if (!$this->_tarr) {
            $tarr = array();
            $flds = array();
            for ($i=0,$max = $this->_numOfFields; $i < $max; $i++) {
                $f = $rs->Fields($i);
                $flds[] = $f;
                $tarr[] = $f->Type;
            }
            // bind types and flds only once
            $this->_tarr = $tarr; 
            $this->_flds = $flds;
        }
        $t = reset($this->_tarr);
        $f = reset($this->_flds);

        if ($this->hideErrors)  $olde = error_reporting(E_ERROR|E_CORE_ERROR);// sometimes $f->value be null
        for ($i=0,$max = $this->_numOfFields; $i < $max; $i++) {
            //echo "<p>",$t,' ';var_dump($f->value); echo '</p>';
            switch($t) {
            case 135: // timestamp
//***               if (!strlen((string)$f->value)) $this->fields[] = false;
//              else {
//                  if (!is_numeric($f->value)) # $val = variant_date_to_timestamp($f->value);
//                      // VT_DATE stores dates as (float) fractional days since 1899/12/30 00:00:00
//                      $val= (float) variant_cast($f->value,VT_R8)*3600*24-2209161600;
//                  else 
//                      $val = $f->value;
//                  $this->fields[] = adodb_date('Y-m-d H:i:s',$val);
//              }
//              break;          
            case 133:// A date value (yyyymmdd) 
//***               if ($val = $f->value) {
//                  $this->fields[] = substr($val,0,4).'-'.substr($val,4,2).'-'.substr($val,6,2);
//              } else
//                  $this->fields[] = false;
//              break;
            case 7: // adDate
                if (!strlen((string)$f->value)) $this->fields[] = false;
                else {
                    if (!is_numeric($f->value)) $val = //$val = variant_date_to_timestamp($f->value);//***
                        // VT_DATE stores dates as (float) fractional days since 1899/12/30 00:00:00
                        $val= (float) variant_cast($f->value,VT_R8)*3600*24-2209161600;
                    else $val = $f->value;

                    if (($val % 86400) == 0) $this->fields[] = adodb_date('Y-m-d',$val);
                    else $this->fields[] = adodb_date('Y-m-d H:i:s',$val);
                }
                break;
            case 1: // null
                $this->fields[] = false;
                break;
            case 20:
            case 21: // bigint (64 bit)
                $this->fields[] = (float) $f->value; // if 64 bit PHP, could use (int)
                break;
            case 6: // currency is not supported properly;
                //***ADOConnection::outp( '<b>'.$f->Name.': currency type not supported by PHP</b>');
                $this->fields[] = (float) $f->value;
                break;
            case 11: //BIT;
                $val = "";
                if(is_bool($f->value))  {
                    if($f->value==true) $val = 1;
                    else $val = 0;
                }
                if(is_null($f->value)) $val = null;

                $this->fields[] = $val;
                break;
            default:
                $this->fields[] = $f->value; 
                break;
            }
            //print " $f->value $t, ";
            $f = next($this->_flds);
            $t = next($this->_tarr);
        } // for
        if ($this->hideErrors) error_reporting($olde);
        @$rs->MoveNext(); // @ needed for some versions of PHP!

//      if ($this->fetchMode & ADODB_FETCH_ASSOC) {
//          $this->fields = $this->GetRowAssoc(ADODB_ASSOC_CASE);
//      }
        //***
        if ($this->fetchMode == ADODB_FETCH_ASSOC) {
            $this->fields = &$this->GetRowAssoc(ADODB_ASSOC_CASE);
        } elseif ($this->fetchMode == ADODB_FETCH_BOTH) {
            $this->fields = array_merge($this->fields, $this->GetRowAssoc(ADODB_ASSOC_CASE));
        }
        return true;
    }

        function NextRecordSet()
        {
            $rs = $this->_queryID;
            $this->_queryID = $rs->NextRecordSet();
            //$this->_queryID = $this->_QueryId->NextRecordSet();
            if ($this->_queryID == null) return false;

            $this->_currentRow = -1;
            $this->_currentPage = -1;
            $this->bind = false;
            $this->fields = false;
            $this->_flds = false;
            $this->_tarr = false;

            $this->_inited = false;
            $this->Init();
            return true;
        }

    function _close() {
        $this->_flds = false;
        try {
        @$this->_queryID->Close();// by Pete Dishman (peterd@telephonetics.co.uk)
        } catch (Exception $e) {
        }
        $this->_queryID = false;    
    }

}

?>

Answer 1

Yoy可以使用函数isset(var)，例如:

if(isset($this->_connectionID->Errors)){
    $errc = $this->_connectionID->Errors;
   if ($errc->Count == 0) return 0;
   $err = $errc->Item($errc->Count-1);
   return $err->NativeError;
 }else{
   // CODE HERE ALERTING ABOUT THE ERROR
 }