Сделал создание DBInterface через std::shared_ptr

extensions/DBServer-MySQL/MySQLInterface.cc

@@ -40,7 +40,14 @@ MySQLInterface::MySQLInterface():
 
 MySQLInterface::~MySQLInterface()
 {
-	close();
+	try
+	{
+		close();
+	}
+	catch( ... ) // пропускаем все необработанные исключения, если требуется обработать нужно вызывать close() до деструктора
+	{
+		cerr << "MySQLInterface::~MySQLInterface(): an error occured while closing connection!" << endl;
+	}
 	delete mysql;
 }
 
@@ -194,13 +201,8 @@ void MySQLInterface::makeResult(DBResult& dbres, MYSQL_RES* myres, bool finalize
 		mysql_free_result(myres);
 }
 // -----------------------------------------------------------------------------------------
-extern "C" DBInterface* create_mysqlinterface()
-{
-	return new MySQLInterface();
-}
-// -----------------------------------------------------------------------------------------
-extern "C" void destroy_mysqlinterface(DBInterface* p)
+extern "C" std::shared_ptr<DBInterface> create_mysqlinterface()
 {
-	delete p;
+	return std::shared_ptr<DBInterface>(new MySQLInterface(), DBInterfaceDeleter());
 }
 // -----------------------------------------------------------------------------------------

extensions/DBServer-PostgreSQL/PostgreSQLInterface.cc

@@ -19,7 +19,14 @@ PostgreSQLInterface::PostgreSQLInterface():
 
 PostgreSQLInterface::~PostgreSQLInterface()
 {
-	close();
+	try
+	{
+		close();
+	}
+	catch( ... ) // пропускаем все необработанные исключения, если требуется обработать нужно вызывать close() до деструктора
+	{
+		cerr << "MySQLInterface::~MySQLInterface(): an error occured while closing connection!" << endl;
+	}
 }
 
 // -----------------------------------------------------------------------------------------
@@ -167,13 +174,8 @@ void PostgreSQLInterface::makeResult(DBResult& dbres, const pqxx::result& res )
 	}
 }
 // -----------------------------------------------------------------------------------------
-extern "C" DBInterface* create_postgresqlinterface()
-{
-	return new PostgreSQLInterface();
-}
-// -----------------------------------------------------------------------------------------
-extern "C" void destroy_postgresqlinterface(DBInterface* p)
+extern "C" std::shared_ptr<DBInterface> create_postgresqlinterface()
 {
-	delete p;
+	return std::shared_ptr<DBInterface>(new PostgreSQLInterface(), DBInterfaceDeleter());
 }
 // -----------------------------------------------------------------------------------------

extensions/DBServer-SQLite/SQLiteInterface.cc

@@ -43,7 +43,14 @@ SQLiteInterface::SQLiteInterface():
 
 SQLiteInterface::~SQLiteInterface()
 {
-	close();
+	try
+	{
+		close();
+	}
+	catch( ... ) // пропускаем все необработанные исключения, если требуется обработать нужно вызывать close() до деструктора
+	{
+		cerr << "MySQLInterface::~MySQLInterface(): an error occured while closing connection!" << endl;
+	}
 }
 
 // -----------------------------------------------------------------------------------------
@@ -254,13 +261,8 @@ void SQLiteInterface::makeResult(DBResult& dbres, sqlite3_stmt* s, bool finalize
 		sqlite3_finalize(s);
 }
 // -----------------------------------------------------------------------------------------
-extern "C" DBInterface* create_sqliteinterface()
-{
-	return new SQLiteInterface();
-}
-// -----------------------------------------------------------------------------------------
-extern "C" void destroy_sqliteinterface(DBInterface* p)
+extern "C" std::shared_ptr<DBInterface> create_sqliteinterface()
 {
-	delete p;
+	return std::shared_ptr<DBInterface>(new SQLiteInterface(), DBInterfaceDeleter());
 }
 // -----------------------------------------------------------------------------------------

include/DBInterface.h

@@ -77,9 +77,17 @@ class DBResult
 
 		ROW row_;
 };
+// ----------------------------------------------------------------------------------
+struct DBInterfaceDeleter
+{
+	void operator()(DBInterface* p) const
+	{
+		try{ delete p; } catch(...) {}
+	}
+};
+// ----------------------------------------------------------------------------------
 // the types of the class factories
-typedef DBInterface* create_dbinterface_t();
-typedef void destroy_dbinterface_t(DBInterface*);
+typedef std::shared_ptr<DBInterface> create_dbinterface_t();
 // --------------------------------------------------------------------------
 #endif // DBInterface_H_
 // --------------------------------------------------------------------------