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diff --git a/src/libstrongswan/database/database.h b/src/libstrongswan/database/database.h
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+/*
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+
+/**
+ * @defgroup databasei database
+ * @{ @ingroup database
+ */
+
+#ifndef DATABASE_H_
+#define DATABASE_H_
+
+typedef enum db_type_t db_type_t;
+typedef struct database_t database_t;
+
+#include <utils/enumerator.h>
+
+/**
+ * Database column types
+ */
+enum db_type_t {
+	/** integer type, argument is an "int" */
+	DB_INT,
+	/** unsigned integer, argument is an "u_int" */
+	DB_UINT,
+	/** string type, argument is a "char*" */
+	DB_TEXT,
+	/** binary large object type, argument is a "chunk_t" */
+	DB_BLOB,
+	/** floating point, argument is a "double" */
+	DB_DOUBLE,
+	/** NULL, takes no argument */
+	DB_NULL,
+};
+
+
+/**
+ * Interface for a database implementation.
+ *
+ * @code
+   int affected, rowid, aint;
+   char *atext;
+   database_t *db;
+   enumerator_t *enumerator;
+   
+   db = lib->database->create("mysql://user:pass@host/database");
+   affected = db->execute(db, &rowid, "INSERT INTO table VALUES (?, ?)",
+   						  DB_INT, 77, DB_TEXT, "a text");
+   printf("inserted %d row, new row ID: %d\n", affected, rowid);
+   
+   enumerator = db->query(db, "SELECT aint, atext FROM table WHERE aint > ?",
+   						  DB_INT, 10, 		// 1 argument to SQL string
+   						  DB_INT, DB_TEXT); // 2 enumerated types in query
+   if (enumerator)
+   {
+       while (enumerator->enumerate(enumerator, &aint, &atext))
+       {
+           printf("%d: %s\n", aint, atext);
+       }
+       enumerator->destroy(enumerator);
+   }
+   @endcode
+ */
+struct database_t {
+	
+	/**
+	 * Run a query which returns rows, such as a SELECT.
+	 *
+	 * @param sql		sql query string, containing '?' placeholders
+	 * @param ...		list of sql placeholder db_type_t followed by its value,
+	 *                  followed by enumerators arguments as db_type_t's
+	 * @return			enumerator as defined with arguments, NULL on failure
+	 */
+	enumerator_t* (*query)(database_t *this, char *sql, ...);
+	
+	/**
+	 * Execute a query which dows not return rows, such as INSERT.
+	 *
+	 * @param rowid		pointer to write inserted AUTO_INCREMENT row ID, or NULL
+	 * @param sql		sql string, containing '?' placeholders
+	 * @param ...		list of sql placeholder db_type_t followed by its value
+	 * @return			number of affected rows, < 0 on failure
+	 */
+	int (*execute)(database_t *this, int *rowid, char *sql, ...);
+	
+	/**
+     * Destroy a database connection.
+     */
+    void (*destroy)(database_t *this);
+};
+
+#endif /* DATABASE_H_ @}*/