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  • Connecting private IPs

    - by Greg Roberts
    A friend of mine told me there was a way to connect two private IPs without using a proxy server. The idea was that both computers connected to a public server and some how the server joined the private connections and won't use any more bandwidth. Is this true? How's this technique named? Thanks

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  • Under what circumstances is an SqlConnection automatically enlisted in an ambient TransactionScope T

    - by Triynko
    What does it mean for an SqlConnection to be "enlisted" in a transaction? Does it simply mean that commands I execute on the connection will participate in the transaction? If so, under what circumstances is an SqlConnection automatically enlisted in an ambient TransactionScope Transaction? See questions in code comments. My guess to each question's answer follows each question in parenthesis. Scenario 1: Opening connections INSIDE a transaction scope using (TransactionScope scope = new TransactionScope()) using (SqlConnection conn = ConnectToDB()) { // Q1: Is connection automatically enlisted in transaction? (Yes?) // // Q2: If I open (and run commands on) a second connection now, // with an identical connection string, // what, if any, is the relationship of this second connection to the first? // // Q3: Will this second connection's automatic enlistment // in the current transaction scope cause the transaction to be // escalated to a distributed transaction? (Yes?) } Scenario 2: Using connections INSIDE a transaction scope that were opened OUTSIDE of it //Assume no ambient transaction active now SqlConnection new_or_existing_connection = ConnectToDB(); //or passed in as method parameter using (TransactionScope scope = new TransactionScope()) { // Connection was opened before transaction scope was created // Q4: If I start executing commands on the connection now, // will it automatically become enlisted in the current transaction scope? (No?) // // Q5: If not enlisted, will commands I execute on the connection now // participate in the ambient transaction? (No?) // // Q6: If commands on this connection are // not participating in the current transaction, will they be committed // even if rollback the current transaction scope? (Yes?) // // If my thoughts are correct, all of the above is disturbing, // because it would look like I'm executing commands // in a transaction scope, when in fact I'm not at all, // until I do the following... // // Now enlisting existing connection in current transaction conn.EnlistTransaction( Transaction.Current ); // // Q7: Does the above method explicitly enlist the pre-existing connection // in the current ambient transaction, so that commands I // execute on the connection now participate in the // ambient transaction? (Yes?) // // Q8: If the existing connection was already enlisted in a transaction // when I called the above method, what would happen? Might an error be thrown? (Probably?) // // Q9: If the existing connection was already enlisted in a transaction // and I did NOT call the above method to enlist it, would any commands // I execute on it participate in it's existing transaction rather than // the current transaction scope. (Yes?) }

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  • How to specify a cipher for an SSL connection in .NET?

    - by dr. evil
    How can I specify a cipher suite to use in an SSL Connections? I know that Mentalis Seclib got this feature however they don't maintain the project as they say .NET Framework 2.0 introduced those features. However I couldn't find a way to do this in .NET Framework 3.5. To be more specific I want to connect an HTTPS service by using NULL cipher, I would do the same thing with OpenSSL by using the following command: openssl s_client -connect www.example.com:443 -cipher NULL How can I do this in .NET?

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  • In UDP, destination

    - by ert
    In UDP, destination IP and destination port number are used to demultiplex the packets, but in TCP destination IP, source IP, destination port number and source port numbers (4-tuple) all needed to distinguish between the connections why reasoning for this usage.

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  • How to delay putting process in background until after it is ready to serve, in shell

    - by Jakub Narebski
    I have two processes: a server that should be run in background, but starts serving requests after a delay, and a client that should be started when server is ready. The server prints line containg "Acceptin connections" to its stderr when ready (server stderr is redirected to a file when running it in background). How to delay putting server process in background until server is ready to serve requests? Alternatively, how to delay running client until server is ready? Language: shell script (or optionally Perl).

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  • Connection Multiplexing

    - by whoi
    Hi; Supposing we have opened a connection of type either TCP or UDP to another remote machine. Having this connection, can we allow multiple connections virtually over this connection like VPN(but not VPN)? I mean multiple applications run on remote machine and you try to access to these applications, is there any multiplexing mechanism or concept supporting such feature?

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  • service.close() vs. service.abort() - WCF example

    - by Larry Watanabe
    In one of the WCF tutorials, I saw the followign sample code: Dim service as ...(a WCF service ) try .. service.close() catch ex as Exception() ... service.abort() end try Is this the correct way to ensure that resources (i.e. connections) are released even under error conditions? Thanks for the answers guys! I upvoted you all.

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  • Python sock.listen(...)

    - by Ian
    All the examples I've seen of sock.listen(5) in the python documentation suggest I should set the max backlog number to be 5. This is causing a problem for my app since I'm expecting some very high volume (many concurrent connections). I set it to 200 and haven't seen any problems on my system, but was wondering how high I can set it before it causes problems.. Anyone know?

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  • Simple ASP.NET Database Query

    - by Steven
    I have loaded my database with one table under "Data Connections" in the "Server Explorer" pane. What is the standard / best-practices way to handle a simple query in a VB ASPX page? My left <div> would be a set of form elements to filter rows, and when the button is clicked, the main <div> would show the columns I want for the rows returned. Note: Answers in C# are okay too, I'll just translate.

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  • Online Collaborative Schema Design (leverage google docs?)

    - by AK
    I'm looking for an online, collaborative schema designer. It's important that it can handle revisions (history of changes). This looks cool, and I could host it on a server - but doesn't look like it would handle multi-user: http://ondras.zarovi.cz/sql/demo/ Currently we're doing a lot of design collaboration on google docs/spreadsheets. Has anyone had any success using google spreadsheet for schema design? Even if there were just a gadget for drawing lines/connections, I might give Google Docs a shot.

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  • Mapping of interconnection with nhibernate

    - by Mauro Destro
    I have to describe interconnection between objects. public class Entity { public string Name {get;set;} public IList<Entity> Connections {get;set;} } How can i persist this? I add another layer of complexity: querying on a specific date a connection between two entities can't be already defined. So probably I need a support table that contain a structure like Id, Source, Destination, ValidFrom, ValidUntil Mauro

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  • Which is better practice: complex SQL statements or Recordset manipulation in Access VBA?

    - by mazi
    I'm doing some VBA development and I found creating SQLs quite efficient way of getting everything done (selecting and updating). But I got to this stage where my SQL statements contain complex Switches and WHERE conditions where I have another Selects to update appropriate records. Therefore, I create this SQLs and I simply run it via "CurrentDb.Execute strSQL" and it does everything fine. The question is, why would I declare ADODB.connections etc, set recordsets, loop through it and manipulate the data one by one?

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  • ASP.NET MVC 2 - user defined database connection.

    - by J Harley
    Hello, I am looking to port my very basic DBMS software from classic ASP to ASP.net - however the user would need to input the connection details in order to connect to their specific DBMS server. Is this at all possible with ASP.NET MVC (very similar to DSN-less connections in ASP). Cheers, Joel

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  • UITableViewCell outlets not set during bundle load (possibly very elementary question)

    - by Jan Zich
    What are the most common reasons for an outlet (a class property) not being set during a bundle load? I'm sorry; most likely I'm not using the correct terms. It's my first steps with iPhone OS development and Objective-C, so please bear with me. Here is more details. Basically, I'm trying to create a table view based form with a fixed number of static rows. I followed this example: http://developer.apple.com/iphone/library/documentation/userexperience/conceptual/TableView_iPhone/TableViewCells/TableViewCells.html Scroll down to The Technique for Static Row Content please. I have one nib file with one table view, three table cells and all connections set as in the example. The problem is that the corresponding cell properties in my controller are never initialised. I get an exception in cellForRowAtIndexPath complaining that the returned cell is nil: UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath. Here are the relevant parts from the implementation of the controller: @synthesize cellA; @synthesize cellB; @synthesize cellC; - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return 3; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { switch (indexPath.row) { case 0: return cellA; break; case 1: return cellB; break; case 2: return cellC; break; default: return nil; } } And here is the interface part: @interface AssociatePhoneViewController : UITableViewController { UITableViewCell *cellA; UITableViewCell *cellB; UITableViewCell *cellB; } @property (nonatomic, retain) IBOutlet UITableViewCell *cellA; @property (nonatomic, retain) IBOutlet UITableViewCell *cellB; @property (nonatomic, retain) IBOutlet UITableViewCell *cellC; @end This must be possibly one of the the most embarrassing questions on StackOverflow. It looks like the most basic example code. Is is possible that the cells are not instantiated with the nib file? I have them on the same level before the tabula view in the nib file. I tried to move them after the table view, but it did not make any difference. Are table cells in some way special? Do I need to set some flag or some property on them in the nib file? I was under the impression that all classes (views, windows, controllers …) listed in a nib file are simply instantiated (and linked using the provided connections). Could it possibly be some memory issue? The cell properties in my controller are not defined in any special way.

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  • Python (Django). Store telnet connection

    - by Shamanu4
    Hello. I am programming web interface which communicates with cisco switches via telnet. I want to make such system which will be storing one telnet connection per switch and every script (web interface, cron jobs, etc.) will have access to it. This is needed to make a single query queue for each device and prevent huge cisco processor load caused by several concurent telnet connections. How do I can do this?

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  • Using the using statement with WinForms... Good Practice?

    - by Nate Heinrich
    I understand the concept and reasons behind using the using statement, and I use it with things like file resources and remote connections, I was wondering if it is good practice to use the using statement with WinForm forms and dialogs? using (MyDialog dlg = new MyDialog()) { if (dlg.ShowDialog() == EDialogResult.OK) { // Do Something } } Thanks!

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  • Other than UDP Broadcast or Multicast, what other methods can I use on a WiFI network to discover co

    - by Gubatron
    I've implemented a simple ping/pong protocol to discover other computers connected to the same WiFI router. This works fine on many routers, but it seems some public routers have UDP traffic blocked or disabled. What other options do I have to discover the computers connected to the router? I was thinking of brute forcing TCP attempts (trying to open connections to all possible IPs on my subnetwork) but this would be very costly and I would have to cycle several times and still not find every machine that's recently connected to the network.

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  • jboss connection pooling

    - by Web
    I have a question related to Prepared Steatement pooling (across all connections). Here's the config file <datasources> <local-tx-datasource> <jndi-name>JNDI-NAME</jndi-name> <connection-url>jdbc:mysql://<server_name>/<database_name>?useServerPrepStmts=true</connection-url> <driver-class>com.mysql.jdbc.Driver</driver-class> <user-name>xxx</user-name> <password>xxxxx</password> <min-pool-size>10</min-pool-size> <max-pool-size>20</max-pool-size> <idle-timeout-minutes>20</idle-timeout-minutes> <exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLExceptionSorter</exception-sorter-class-name> <valid-connection-checker-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLValidConnectionChecker</valid-connection-checker-class-name> <background-validation>true</background-validation> <background-validation-minutes>5</background-validation-minutes> <prepared-statement-cache-size>100</prepared-statement-cache-size> <share-prepared-statements>true</share-prepared-statements> <!-- sql to call when connection is created <new-connection-sql>some arbitrary sql</new-connection-sql> --> <!-- sql to call on an existing pooled connection when it is obtained from pool - MySQLValidConnectionChecker is preferred for newer drivers <check-valid-connection-sql>some arbitrary sql</check-valid-connection-sql> --> <!-- corresponding type-mapping in the standardjbosscmp-jdbc.xml --> <metadata> <type-mapping>mySQL</type-mapping> </metadata> </local-tx-datasource> </datasources> It seems that this line: <background-validation-minutes>5</background-validation-minutes> doesn't cause any problems with Prepared Statements, but: <idle-timeout-minutes>20</idle-timeout-minutes> causes that all connections are removed and re-created if there was no traffic for the last 20 minutes. Because of that existing Prepared Statements are removed from the pool of cached Prepared Statements. How to overcome this issue? I have to use idle-timeout-minutes because MySQL server closes the connection after 8h

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