Implement a PostgreSQL backend

1 files changed, 95 insertions, 0 deletions

diff --git a/src/database-postgresql.h b/src/database-postgresql.h
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+++ b/src/database-postgresql.h
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+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef DATABASE_POSTGRESQL_HEADER
+#define DATABASE_POSTGRESQL_HEADER
+
+#include <string>
+#include <libpq-fe.h>
+#include "database.h"
+#include "util/basic_macros.h"
+
+class Settings;
+
+class Database_PostgreSQL : public Database
+{
+public:
+	Database_PostgreSQL(const Settings &conf);
+	~Database_PostgreSQL();
+
+	void beginSave();
+	void endSave();
+
+	bool saveBlock(const v3s16 &pos, const std::string &data);
+	void loadBlock(const v3s16 &pos, std::string *block);
+	bool deleteBlock(const v3s16 &pos);
+	void listAllLoadableBlocks(std::vector<v3s16> &dst);
+	bool initialized() const;
+
+private:
+	// Database initialization
+	void connectToDatabase();
+	void initStatements();
+	void createDatabase();
+
+	inline void prepareStatement(const std::string &name, const std::string &sql)
+	{
+		checkResults(PQprepare(m_conn, name.c_str(), sql.c_str(), 0, NULL));
+	}
+
+	// Database connectivity checks
+	void ping();
+	void verifyDatabase();
+
+	// Database usage
+	PGresult *checkResults(PGresult *res, bool clear = true);
+
+	inline PGresult *execPrepared(const char *stmtName, const int paramsNumber,
+			const void **params,
+			const int *paramsLengths = NULL, const int *paramsFormats = NULL,
+			bool clear = true, bool nobinary = true)
+	{
+		return checkResults(PQexecPrepared(m_conn, stmtName, paramsNumber,
+			(const char* const*) params, paramsLengths, paramsFormats,
+			nobinary ? 1 : 0), clear);
+	}
+
+	// Conversion helpers
+	inline int pg_to_int(PGresult *res, int row, int col)
+	{
+		return atoi(PQgetvalue(res, row, col));
+	}
+
+	inline v3s16 pg_to_v3s16(PGresult *res, int row, int col)
+	{
+		return v3s16(
+			pg_to_int(res, row, col),
+			pg_to_int(res, row, col + 1),
+			pg_to_int(res, row, col + 2)
+		);
+	}
+
+	// Attributes
+	std::string m_connect_string;
+	PGconn *m_conn;
+	int m_pgversion;
+};
+
+#endif
+