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  • Twisted + SQLAlchemy and the best way to do it.

    - by Khorkrak
    So I'm writing yet another Twisted based daemon. It'll have an xmlrpc interface as usual so I can easily communicate with it and have other processes interchange data with it as needed. This daemon needs to access a database. We've been using SQL Alchemy in place of hard coding SQL strings for our latest projects - those mostly done for web apps in Pylons. We'd like to do the same for this app and re-use library code that makes use of SQL Alchemy. So what to do? Well of course since that library was written for use in a Pylons app it's all the straight-forward blocking style code that everyone is accustomed to and all of the non-blocking is magically handled by Pylons via threading, thread locals, scoped sessions and so on. So now for Twisted I guess I'm a bit stuck. I could: Just write the sql I need directly if it's minimal and use the dbapi pool in twisted to do runInteractions etc when I need to hit the db. Use the objects and inherently blocking methods in our library and block now and then in my Twisted daemon. Bah. Use sAsync which was last updated in 2008 and kind of reuse the models we have defined already but not really and it does address code that needs to work in Pylons either. Does that even work with the latest version SQL Alchemy? Who knows. That project looked great though - why was it apparently abandoned? Spawn a separate subprocess and have it deal with the library code and all it's blocking, the results being returned back to my daemon when ready as objects marshalled via YAML over xmlrpc. Use deferToThread and then expunge the objects returned having made sure to do eager loads so that I have all my stuff that I might need. Seems kind of ugha to me. I'm also stuck using Python 2.5.4 atm so no 2.6 yet and I don't think I can just do an import from future to get access to the cool new multiprocessing module stuff in there. That's OK though I guess as we've got dealing with interprocess communication down pretty well. So I'm leaning towards option 4 mostly as that would avoid the mortal sin of logic duplication with option 1 while also staying the heck away from threads. Any better ideas?

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  • C# ApplicationContext usage

    - by rd42
    Apologies if my terminology is off, I'm new to C#. I'm trying to use an ApplicationContext file to store mysql conn values, like dbname, username, password. The class with mysql conn string is "using" the namespace for the ApplicationContext, but when I print out the connection string, the values are making it. A friend said, "I'm not initializing it" but couldn't stay to expand on what "it" was. and the "Console.WriteLine("1");" in ApplicationContext.cs never shows up. Do I need to create an ApplicationContext object and the call Initialize() on that object? Thanks for any help. ApplicationContext.cs: namespace NewApplication.Context { class ApplicationContext { public static string serverName; public static string username; public static string password; public static void Initialize() { //need to read through config here try { Console.WriteLine("1"); XmlDocument xDoc = new XmlDocument(); xDoc.Load(".\\Settings.xml"); XmlNodeList serverNodeList = xDoc.GetElementsByTagName("DatabaseServer"); XmlNodeList usernameNodeList = xDoc.GetElementsByTagName("UserName"); XmlNodeList passwordNodeList = xDoc.GetElementsByTagName("Password"); } catch (Exception ex) { // MessageBox.Show(ex.ToString()); //TODO: Future write to log file username = "user"; password = "password"; serverName = "localhost"; } } } } MySQLManager.cs: note: dbname is the same as the username as you'll see in the code, I copied this from a friend who does that. using System; using System.Collections.Generic; using System.Linq; using System.Text; using MySql.Data; using MySql.Data.MySqlClient; using NewApplication.Context; namespace NewApplication.DAO { class MySQLManager { private static MySqlConnection conn; public static MySqlConnection getConnection() { if (conn == null || conn.State == System.Data.ConnectionState.Closed) { string connStr = "server=" + ApplicationContext.serverName + ";user=" + ApplicationContext.username + ";database=" + ApplicationContext.username + ";port=3306;password=" + ApplicationContext.password + ";"; conn = new MySqlConnection(connStr); try { Console.WriteLine("Connecting to MySQL... "); Console.WriteLine("Connection string: " + connStr + "\n"); conn.Open(); // Perform databse operations // conn.Close(); } catch (Exception ex) { Console.WriteLine(ex.ToString()); } } return conn; } } } and, thanks for still reading, this is the code that uses the two previous files: class LogDAO { MySqlConnection conn; public LogDAO() { conn = MySQLManager.getConnection(); } Thank you, rd42

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  • IF statement within WHILE not working

    - by Ds.109
    I am working on a basic messaging system. This is to get all the messages and to make the row of the table that has an unread message Green. In the table, there is a column called 'msgread'. this is set to '0' by default. Therefore it should make any row with the msgread = 0 - green. this is only working for the first row of the table with the code i have - i verified that it is always getting a 0 value, however it only works the first time through in the while statement .. require('./connect.php'); $getmessages = "SELECT * FROM messages WHERE toperson = '" . $userid . "'"; echo $getmessages; $messages = mysql_query($getmessages); if(mysql_num_rows($messages) != 0) { $table = "<table><tr><th>From</th><th>Subject</th><th>Message</th></tr>"; while($results = mysql_fetch_array($messages)) { if(strlen($results[message]) < 30){ $message = $results[message]; } else { $message = substr($results[message], 0 ,30) . "..."; } if($results[msgread] == 0){ $table .= "<tr style='background:#9CFFB6'>"; $table .= "<td>" . $results[from] . "</td><td>" . $results[subject] . "</td><td><a href='viewmessage.php?id=" . $results[message_id] ."'>" . $message . "</a></td></tr>"; } else { $table .= "<tr>"; $table .= "<td>" . $results[from] . "</td><td>" . $results[subject] . "</td><td><a href='viewmessage.php?id=" . $results[message_id] ."'>" . $message . "</a></td></tr>"; } } echo $table ."</table>"; } else { echo "No Messages Found"; } There's all the code, including grabbing the info from the database. Thanks.

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  • Keep IIS7 Failed Request Tracing as a sysadmin only diagnostic tool?

    - by Kev
    I'm giving some of our customers the ability to manage their sites via IIS Feature Delegation and IIS Manager for Remote Administration. One feature I'm unsure about permitting access to is Failed Request Tracing for the following reasons: Customers will forget to turn it off The server will be taking a performance hit (especially if 500 sites all have it turned on) The server will become littered with old FRT's The potential to leak sensitive information about how the server is configured thus providing useful information to would-be intruders. Should we just keep this as a troubleshooting tool for our own admins?

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  • What is the best powershell script to restore an SQL Database?

    - by EtienneT
    To restore an SQL Server 2008 database, I would lile to be able to just do something like this in powershell: ./restore.ps1 DatabaseName.bak Then the powershell script would by convention restore it to a database with name "DatabaseName". It would disconnect any user connected to this database so that it can restore the DB. It would store the mdf and ldf in the default location. This would mainly be while developing on my personal machine. Just a quick way to restore a DB. Anyone has such a script? Thanks

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  • Tool to automatically combine many large pivot table in many large Excel sheet ?

    - by Sim
    Hi all, We have several Excel files that contains large pivot data table with the same structure For example File A Pivot table (Field A, B, C) File B Pivot table (Field A, B, C) We want to combine them into 1 pivot table (A, B, C). Just want to know which ways we can do it ? Manual way : open a new empty sheet, copy and paste the pivot there and create the pivot again Automatic way : is there some tool that did this ? Thanks

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  • What happens when Oracle's Enterprise Single-Sign-On database goes down? [migrated]

    - by Unai
    We're working on setting up Oracle's Enterprise Single-Sign-On with High Availability. At the moment every component provides HA except our database backend (i.e. we have just one instance). While conducting some kick-the-plug tests we learnt that the ESSO system works even with the database turned OFF. This was a nice surprise but now we need to understand what are the implications of a database failure; sure the sessions might be handled on the application servers and the policies might have been cached but... for how long? how big is this cache? what is the role of the database? I would appreciate if anyone shares her/his experience and/or points out to documentation that covers this. Thank you so much.

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  • Excel 2007: what happened to the Auto Expand Selection tool?

    - by Erik Olson
    Older versions of Excel had a icon that would expand the selection to include any non-empty cells in all directions. It was an X shape with four arrowheads. You can still write VBA code to do this, but I really miss this tool. Did they just drop it from Excel 2007? In older versions you had to go get it from the Customize menu because it wasn't on any toolbar by default.

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  • How to set minimum SQL Server resource allocation for a database?

    - by Jeff Widmer
    Over the past Christmas holiday week, when the website I work on was experiencing very low traffic, we saw several Request timed out exceptions (one on each day 12/26, 12/28, 12/29, and 12/30) on several pages that require user authentication. We rarely saw Request timed out exceptions prior to this very low traffic week. We believe the timeouts were due to the database that it uses being "spun down" on the SQL Server and taking longer to spin up when a request came in. There are 2 databases on the SQL Server (SQL Server 2005), one which is specifically for this application and the other for the public facing website and for authentication; so in the case where users were not logged into the application (which definitely could have been for several hours at a time over Christmas week) the application database probably received no requests. We think at this point SQL Server reallocated resources to the other database and then when a request came in, extra time was needed to spin up the application database and the timeout occurred. Is there a way to tell SQL Server to give a minimum amount of resources to a database at all times?

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  • What is the best tool to draw an idea?

    - by Abhishek
    I have one twitter based idea which I have put in words. But I would like to have a prototype which contains screens and will show how exactly the homepage, other pages will look like. Basically it should explain the complete flow of the application. What is the best and easiest tool to do that?

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  • How do I remove Slony from a restored PostgreSQL database?

    - by Scott Herbert
    I've restored a database which came from a server on which Slony was running. The server on which the database has been restored does not have Slony installed. When the database restored, there were a lot of errors reported, with Slony related objects not getting created due to Slony related logins being missing. This I thought was not a problem, as losing the Slony objects didn't seem to matter, and infact seemed desirable. However, now I've got an anoying, if not critical problem. Whenever one clicks on a table in the newly restored DB in PGAdmin, a Slony related error popup ... pops up. The first one reads: "An error has occured: ERROR: function _rmscl.getlocalnodeid(unknown) does not exist" I notice that under the Replication node in PGAdmin, that there is a Slony replication cluster. Trying to drop this cluster results in more object missing type errors. Does anyone have any ideas how we can remove the last vestiges of Slony from this database?

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  • How do I configure SQL Server to allow other users to access a database?

    - by Zian Choy
    Environment: Windows 7 Ultimate SQL Server 2005 Express 2 users on the computer I tried making the 2nd user a user in SQL Server (THINKPAD\2ndUser) and adding him to the database ("2ndUser"). Then, I logged in as 2ndUser and started Visual Studio 2008. When I tried to connect to the database, I got the following error message: The database '<bleep>' does not exist or you do not have permission to see it.

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  • How should I set up protection for the database against sql injection when all the php scripts are flawed?

    - by Tchalvak
    I've inherited a php web app that is very insecure, with a history of sql injection. I can't fix the scripts immediately, I rather need them to be running to have the website running, and there are too many php scripts to deal with from the php end first. I do, however, have full control over the server and the software on the server, including full control over the mysql database and it's users. Let's estimate it at something like 300 scripts overall, 40 semi-private scripts, and 20 private/secure scripts. So my question is how best to go about securing the data, with the implicit assumption that sql injection from the php side (e.g. somewhere in that list of 300 scripts) is inevitable? My first-draft plan is to create multiple tiers of different permissioned users in the mysql database. In this way I can secure the data & scripts in most need of securing first ("private/secure" category), then the second tier of database tables & scripts ("semi-private"), and finally deal with the security of the rest of the php app overall (with the result of finally securing the database tables that essentially deal with "public" information, e.g. stuff that even just viewing the homepage requires). So, 3 database users (public, semi-private, and secure), with a different user connecting for each of three different groups of scripts (the secure scripts, the semi-private scripts, and the public scripts). In this way, I can prevent all access to "secure" from "public" or from "semi-private", and to "semi-private" from "public". Are there other alternatives that I should look into? If a tiered access system is the way to go, what approaches are best?

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  • What tool to use to check newly built PC before installing Windows?

    - by Borek
    There is a similar question: http://superuser.com/questions/31786/what-tools-to-test-the-reliability-and-stability-of-a-newly-built-pc but I'm interested in some tool / bootable CD that would check the PC (CPU, RAM, GPU) before I install Windows. Reason: I'm just installing Win7 64b on a machine with Core i7 and SSD and it's suspiciously slow (after 15 minutes, it's just began expanding installation files) so I'm seeking tools that would help troubleshoot it.

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  • Tool for making fn-x buttons work? Archlinux, handler.sh

    - by data_jepp
    This just seems like such a normal thing to work. I know that this works out of the box on Ubuntu. But not in Archlinux. I would like to think that there is a tool in existence that would use acpi_listen to create a step by step way to enable all of the fn buttons on the keyboard. Everything works expect fn-F10(mute), fn-F11(s-down), fn-F12(s-up). How can I make the sound buttons work?

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  • Any tool to check which ports/protocols firewalls prevent?

    - by Jus12
    Suppose I have a setup as: host_1 --- Firewall_1 --- Internet --- Firewall_2 --- host_2 I need to check which ports are open on host_2 from host_1 (which may be blocked by either firewalls) If there a tool that comes in two parts (one running on host_1 and other on host_2) that does this for me? It should be something like: 1 Listen to all ports on host_2 2 Try to connect to every port on host_2 from host_1 3 Give a report what ports are allowed.

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