diff -r 86ceb97db7de -r 24c05e69d68f src/OdbcCommon.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/OdbcCommon.h	Mon May 25 19:36:06 2020 +0200
@@ -0,0 +1,53 @@
+/**
+ * Relational pipes
+ * Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include <sql.h>
+
+#include "SqlException.h"
+
+namespace relpipe {
+namespace tr {
+namespace sql {
+
+class OdbcCommon {
+public:
+
+	static bool isSuccessful(SQLRETURN result) {
+		return result == SQL_SUCCESS || result == SQL_SUCCESS_WITH_INFO;
+	}
+
+	static bool isNotSuccessful(SQLRETURN result) {
+		return !isSuccessful(result);
+	}
+
+	static SQLHANDLE allocateHandle(SQLSMALLINT type, SQLHANDLE input) {
+		SQLHANDLE output;
+		SQLRETURN result = SQLAllocHandle(type, input, &output);
+		if (isNotSuccessful(result)) throw SqlException(L"Unable to allocate handle " + std::to_wstring(type));
+		return output;
+	}
+
+	static void freeHandle(SQLSMALLINT type, SQLHANDLE handle) {
+		SQLRETURN result = SQLFreeHandle(type, handle);
+		if (isNotSuccessful(result)) throw SqlException(L"Unable to free handle of type: " + std::to_wstring(type));
+	}
+};
+
+}
+}
+}
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