尝试从数据库中提取存储为Blob的xml文件并将提取的xml数据存储在php对象中

Question

I currently have a database which contains xml files stored as blobs. When I attempt to extract this data using sql I am not getting the data in the original xml format rather just bits of text from the xml file. I have tried a number of ways but no luck so far anyone have any ideas on how to do this?

The aim is to determine which xml file is needed for comparison, to retrieve it from the database and compare it to another xml file.

Heres one thing I've been trying:

                **//************THIS IS WHERE THE PROBLEM IS*************************
                if($databaseMatchedModelsObjects[$count] -> version == $maxVersion && $databaseMatchedModelsObjects[$count] -> release == $maxRelease){
                    $con2 = connect2();
                    $contentModel = $con2->prepare("SELECT fileName, type, size, content FROM model WHERE id=:id LIMIT 1");
                        //print_r($databaseMatchedModelsObjects[$count] -> mid);
                        $contentModel->bindParam('id',$databaseMatchedModelsObjects[$count] -> mid,PDO::PARAM_INT);
                        $contentModel->execute(array('id'=>$databaseMatchedModelsObjects[$count] -> mid));
                        $row = $contentModel->fetch();
                        //$sql_statement= "SELECT xmltype(content, nls_charset_id('CHAR_CS')).getclobval() rfile FROM model WHERE id =" . $databaseMatchedModelsObjects[$count] -> id;
                        //$sql_result = mysqli_query($con, $sql_prim);
                        //print_r($sql_result);
                        //if($row = @mysqli_fetch_array($result)) {
                        if($row) {
                        $finalModelToCompareTo = $row['content'];
                        //echo(simplexml_load_string());
                        //print_r(simplexml_load_string($finalModelToCompareTo));
                        //print_r($finalModelToCompareTo);
                        //$finalModelToCompareTo = $databaseMatchedModelsObjects[$count] -> content;
                        //print_r($databaseMatchedModelsObjects[$count] -> content);

                    }

               }

Example print out using var dump of the content, just a snippet full print out is too long. This should be in xml format.

string(15513) " G title sub title 0 English 0 date This is the top level of the Common Information Model.   This model contains the singleton, root Managed Object Class (MOC) ManagedElement under which the complete model is contained. Directly under ManagedElement are managed-function level classes SF, T, E and the root MOC of any managed functions. The Equipment Root MOC is in the Equipment Managed Object Model (MOM). The root MOC for a managed function is hosted in the managed function MOM. Deprecated, Contains product information for a Managed Element and ManagedFunction(s).  Replaced by ProductData The product number in ABC format.  For information, refer to Corporate Basic Standards. The product revision in the form R[1-9][A-Z].  For information, refer to Corporate Basic Standards. Common product name.

XML File that I will be comparing against Sample code:

How it is printed in comparison:

$uploaded_model = @simplexml_load_file($targetdir . "\\" . $fileinfo->getFilename()); print_r($uploaded_model);

SimpleXMLElement Object ( [dtdVersion] => G [momMetaData] => SimpleXMLElement Object ( [momTitle] => title [momSubTitle] => sub title [momIdentity] => SimpleXMLElement Object ( [docNum] => 0 [docLang] => English [docRev] => 0 [docDate] => date ) [createdBy] => SimpleXMLElement Object ( [signature] => xqichen ) ) [mim] => SimpleXMLElement Object ( [@attributes] => Array ( [author] => XQHE [contact] => ok@dektech.com.au [correction] => 0 [date] => 2014-11-22 [docNo] => [name] => CmwPm [namespace] => urn:com:CmwPm [namespacePrefix] => cmwpm [organization] => XDT/DEK [release] => 2 [revision] => A [version] => 2 ) [description] => Performance Management MOM. 3GPP defines Performance Management in 3GPP 32.401. [domainExtension] => SimpleXMLElement Object ( [@attributes] => Array ( [domain] => ECIM ) [extension] => Array ( [0] => SimpleXMLElement Object ( [@attributes] => Array ( [name] => MomName [value] => PM ) ) [1] => SimpleXMLElement Object ( [@attributes] => Array ( [name] => Version [value] => 2 ) ) [2] => SimpleXMLElement Object ( [@attributes] => Array ( [name] => ecimMomRelease [value] => 3 ) ) [3]
=> SimpleXMLElement Object ( [@attributes] => Array ( [name] => ecimMomCorrection [value] => 0 ) ) [4] => SimpleXMLElement Object ( [@attributes] => Array ( [name] => immNamespace [value] => MOM_NAME ) ) ) ) [implements] => SimpleXMLElement Object ( [@attributes] => Array ( [correction] => 0 [name] => ECIM_PM [release] => 3 [version] => 2 ) ) [struct] => Array ( [0] => SimpleXMLElement Object ( [@attributes]
=> Array ( [name] => MeasurementReaderNameValue ) [description] => This name value is used for real-time monitoring. The real-time monitoring is set up using a PM job of type REALTIMEJOB. [structMember] => Array ( [0] => SimpleXMLElement Object ( [@attributes] => Array ( [name] => currentValue ) [description] => Contains the real-time value of the measurement. This value can be read in conjunction with attribute lastUpdated to determine the value of counters in real time. [string] => SimpleXMLElement Object ( ) ) [1] => SimpleXMLElement Object ( [@attributes] => Array ( [name] => lastUpdated ) [description] => Contains the exact time the currentValue was last set. This attribute is used to determine how recent the value supplied in currentValue is. [derivedDataTypeRef] => SimpleXMLElement Object ( [@attributes] => Array ( [name] => DateTime ) [mimName] => CmwPm ) )

Answer 1

I managed to fix my problem by:

$xml = simplexml_load_string($finalModelToCompareTo);

The XML seems to have been converted to string within the blob and you need to use this method to convert it back to a SimpleXMLObject again.

Answer 2

I think it really IS a XML file. The string(15513) " G title sub title 0 En... representation is the same XML file parsed by the browser and you only see the plaintext values but not the XML tags. So, don't worry about the losses you see in the printout. If you open up the webpage source using Ctrl+U you can see the complete XML file syntax.