Help, about data synchronization between C++ and PHP API!

Question

I use Berkeley DB XML as my Server's database, the client access the database via http by C++ API. I don't close the XmlManager and XmlContainer after read and write the database for better performance. However, I provide another way to manipulate the database via web by PHP. After I updated the data by PHP, I found that I couldn't catch the update.
If I close the XmlManager and XmlContainer after read and write the database every time, the problem disappeared. But I can't do that for performance.
How can I solve this problem? Thanks!

Answer 1

First of all, thank you for your attention.
I don't share the same environment for the two processes, but I seted the same configure flags on the environment. The flags as follows:
DB_CREATE|DB_INIT_LOCK|DB_INIT_LOG|DB_INIT_MPOOL|DB_INIT_TXN|DB_RECOVER;
The C++ code as follows:
//C++ code
UINT32 envFlags = DB_CREATE|DB_INIT_LOCK|DB_INIT_LOG|DB_INIT_MPOOL|DB_INIT_TXN|DB_RECOVER;
INT32 lRet = 0;
string ctnName = "rls_services.bdbxml";
string docName = "index.xml";
CHAR acXQuery[256] = {0};
CHAR acXmlDoc[] = "<test>C++ test</test>";
//from      
DbEnv *pDbEnv  = new DbEnv(0);
XmlManager *pxmlMgr = NULL;
pDbEnv->open("/usr/local/xdms", envFlags, 0);
pxmlMgr = new XmlManager(pDbEnv, DBXML_ADOPT_DBENV);
lRet = pxmlMgr->existsContainer(ctnName);
if(0 == lRet)
     pxmlMgr->createContainer(ctnName);     
XmlContainer xmlCtn = pxmlMgr->openContainer(ctnName);
//to
// the code between 'from' and 'to' is a seperate function
XmlQueryContext xmlQC = pxmlMgr->createQueryContext();
XmlUpdateContext xmlUC = pxmlMgr->createUpdateContext();
sprintf(acXQuery, "doc(\"%s/%s\")", ctnName, docName);
XmlQueryExpression xmlQE = pxmlMgr->prepare(acXQuery, xmlQC);
XmlResults xmlResult = xmlQE.execute(xmlQC);
XmlDocument xmlDoc;
if (xmlResult.hasNext())
xmlDoc = xmlCtn.getDocument(docName);
xmlDoc.setContent(acXmlDoc);
xmlCtn.updateDocument(xmlDoc, xmlUC);
else
xmlDoc = pxmlMgr->createDocument();
xmlDoc.setName(docName);
xmlDoc.setContent(acXmlDoc);
xmlCtn.putDocument(xmlDoc, xmlUC);
// I don't close the Container and Manager for performance
The PHP code as follow:
<php?
$DB_DIR = "/usr/local/xdms";
$env = new Db4Env();
$enFlags = DB_CREATE|DB_INIT_LOCK|DB_INIT_LOG|DB_INIT_MPOOL|DB_INIT_TXN|DB_RECOVER;
$env->open("/usr/local/xdms", $enFlags, 0);
$xmlManager = new XmlManager($env, 0);
$ctnName = 'rls_services.bdbxml';
$docName = 'index.xml';
$docContent = '<test>PHP test</test>';
if (!$xmlManager->existsContainer($ctnName))
     return ;
$xmlCtn = $xmlManager->openContainer($ctnName);
$xmlQC = $xmlManager->createQueryContext();
$xmlUC = $xmlManager->createUpdateContext();
$acXQuery = "doc('".$ctnName.'/'.$docName."')";
$xmlQE = $xmlManager->prepare($acXQuery, $xmlQC);
$xmlResult = $xmlQE->execute($xmlQC);
if ($xmlResult->hasNext())
     $xmlDoc = $xmlCtn->getDocument($docName);
     $xmlDoc->setContent($docContent);
     $xmlCtn->updateDocument($xmlDoc, $xmlUC);
else
     $xmlDoc = $xmlManager->createDocument();
     $xmlDoc->setName($docName);
     $xmlDoc->setContent($docContent);
     $xmlCtn->putDocument($xmlDoc, $xmlUC);
unset($xmlDoc);
unset($xmlCtn);
?>
The code between 'from' and 'to' excute only one time when server start.
After the server started, I write data by PHP. I can read out the data that
writed by PHP just now, but I can't read out the data by C++ because I don't
close the XmlContainer and XmlManager.
After I restarted the server, I can readout the data by C++. But I can't
open and close database for each request for performance as a server.
what should I do ? Thank you!
Whether I express my question clearly or not?