[SF 2580108] Improve transaction handling

Data/SQLite/include/Poco/Data/SQLite/SessionImpl.h

@@ -83,8 +83,25 @@ public:
 	bool isConnected();
 		/// Returns true if connected, false otherwise.
 
+	bool canTransact();
+		/// Returns true if session has transaction capabilities.
+
 	bool isTransaction();
-		/// Returns true iff a transaction is in progress.
+		/// Returns true iff a transaction is a transaction is in progress, false otherwise.
+
+	void setTransactionIsolation(Poco::UInt32 ti);
+		/// Sets the transaction isolation level.
+
+	Poco::UInt32 getTransactionIsolation();
+		/// Returns the transaction isolation level.
+
+	bool hasTransactionIsolation(Poco::UInt32 ti);
+		/// Returns true iff the transaction isolation level corresponding
+		/// to the supplied bitmask is supported.
+
+	bool isTransactionIsolation(Poco::UInt32 ti);
+		/// Returns true iff the transaction isolation level corresponds
+		/// to the supplied bitmask.
 
 	const std::string& connectorName();
 		/// Returns the name of the connector.
@@ -107,6 +124,12 @@ private:
 //
 // inlines
 //
+inline bool SessionImpl::canTransact()
+{
+	return true;
+}
+
+
 inline 	bool SessionImpl::isTransaction()
 {
 	return _isTransaction;

Data/SQLite/src/SessionImpl.cpp

@@ -38,7 +38,9 @@
 #include "Poco/Data/SQLite/Utility.h"
 #include "Poco/Data/SQLite/SQLiteStatementImpl.h"
 #include "Poco/Data/SQLite/Connector.h"
+#include "Poco/Data/Session.h"
 #include "Poco/String.h"
+#include "Poco/Exception.h"
 #include "sqlite3.h"
 #include <cstdlib>
 
@@ -104,6 +106,33 @@ void SessionImpl::rollback()
 }
 
 
+void SessionImpl::setTransactionIsolation(Poco::UInt32 ti)
+{
+	if (ti != Session::TRANSACTION_READ_COMMITTED)
+		throw Poco::InvalidArgumentException("setTransactionIsolation()");
+}
+
+
+Poco::UInt32 SessionImpl::getTransactionIsolation()
+{
+	return Session::TRANSACTION_READ_COMMITTED;
+}
+
+
+bool SessionImpl::hasTransactionIsolation(Poco::UInt32 ti)
+{
+	if (ti == Session::TRANSACTION_READ_COMMITTED) return true;
+	return false;
+}
+
+
+bool SessionImpl::isTransactionIsolation(Poco::UInt32 ti)
+{
+	if (ti == Session::TRANSACTION_READ_COMMITTED) return true;
+	return false;
+}
+
+
 void SessionImpl::open()
 {
 	int rc = sqlite3_open(connectionString().c_str(), &_pDB);