Created Pgsql::Transaction class for handling of transactions. It auto rollsback if no commit has been done.

Also moved some code out of the connection files to their own files.

pgsql/Pgsql_Transaction.h

@@ -0,0 +1,53 @@
+#ifndef PGSQL_TRANSACTION_H
+#define PGSQL_TRANSACTION_H
+
+#include <QString>
+#include <string>
+#include "Pgsql_Canceller.h"
+
+namespace Pgsql {
+
+	class Result;
+	class Params;
+	class Connection;
+
+
+	class Transaction {
+	public:
+		static Transaction startTransaction(Connection &conn);
+		~Transaction();
+		void rollback();
+		void commit();
+		Canceller getCancel();
+		std::string getErrorMessage() const;
+		Result query(const char * command);
+		Result query(const QString &command);
+		Result queryParam(const char * command, const Params &params);
+		Result queryParam(const QString &command, const Params &params);
+		bool sendQuery(const char * query);
+		bool sendQuery(const std::string &command);
+		bool sendQuery(const QString &command);
+		bool sendQueryParams(const char * command, const Params &params);
+		std::shared_ptr<Result> getResult();
+		bool consumeInput();
+		bool isBusy();
+		std::string escapeLiteral(const std::string_view &literal);
+		QString escapeLiteral(const QString &literal);
+		std::string escapeIdentifier(const std::string_view &ident);
+		QString escapeIdentifier(const QString &ident);
+		QString getDBName() const;
+
+	private:
+		Connection *m_conn = nullptr;
+		bool m_committed = false;
+		bool m_rolledback = false;
+
+		Transaction(Connection *conn)
+			: m_conn(conn)
+		{
+		}
+	};
+
+}
+
+#endif // PGSQL_TRANSACTION_H