public void DropAllTables() {
		connectDB();
		PreparedStatement stmt = null;
		try {
			stmt = dbConnection.prepareCall("Begin	for c in (select table_name from user_tables) loop	execute immediate ('drop table '||c.table_name||' cascade constraints');	end loop;	End;");
//			System.out.println(stmt.executeUpdate());
			stmt.execute();
		} catch (SQLException e) {
			System.out.println(e);
		}finally{
			if(stmt != null)try{stmt.close();}catch(Exception e){};
			if(dbConnection != null)try{dbConnection.close();}catch (Exception e) {};
		}
	}