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  • net c# lock statement in data access layer

    - by Pedro Rivera
    I saw a code where they have the data access layer like this: public class CustomerDA{ private static readonly object _sync = new object(); private static readonly CustomerDA _mutex = new CustomerDA(); private CustomerDA(){ } public CustomerDA GetInstance(){ lock(_sync){ return _mutex; } } public DataSet GetCustomers(){ //database SELECT //return a DataSet } public int UpdateCustomer(some parameters){ //update some user } } public class CustomerBO{ public DataSet GetCustomers(){ //some bussiness logic return CustomerDA.GetInstance().GetCustomers(); } } I was using it, but start thinking... "and what if had to build a facebook like application where there are hundreds of thousands of concurrent users? would I be blocking each user from doing his things until the previous user ends his database stuff? and for the Update method, is it useful to LOCK THREADS in the app when database engines already manage concurrency at database server level?" Then I started to think about moving the lock to the GetCustomers and UpdateCustomer methods, but think again: "is it useful at all?"

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  • how to invoke function writen in a validation.php and stroe all function name in database.

    - by saint
    Respected all, i'm in trouble. I created a file with name validation.php and store all my validation functionality in this file with different function names like, check_textbox(parm1, pram2, pram3, pram4) { // Definition here } check_chkBox(parm1, pram2) { // Definition here } and so on.....! then i created a table in mysql with the name tbValidation and stored all the function name with parameters in a table. the record stored in table look like as: interfaceid---------- functionNameWithReturnValue 1 ------------ check_textbox(parm1, pram2, pram3, pram4) = 1 2 ------------ check_textbox(parm1, pram2, pram4) = 0 3 ------------ check_textbox(parm1, pram2, pram4) = 1) AND (check_chkBox(parm1, pram2)=0) when i fetch record from database i want to invoke those functions that store in validation.php $data = mysql_fetch_array($drow); if($db->row_count > 0) { // when i fetch row one from database. I used this one but not working // @ $data[0] have value "check_textbox(parm1, pram2, pram3, pram4) = 1" if($data[0]) { // Do this } } How i can do this task...? :(

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  • Telnet SMTP with expect or shell script

    - by Fendrix
    Want to build up a Auth Smtp Connection with expect script... just to test I wanted to get ehlo parameters but expect is not working like this #!/usr/bin/expect set timeout -1 set smtp [lindex $argv 0] set port [lindex $argv 1] spawn telnet $smtp $port expect "[2]{2,}[0]{1,}" send "ehlo" I expect the code 220 to come from mailserver to continue to send ehlo ... just like ..../...:telnet smtp.mail.yahoo.de 25 Trying 77.238.184.85... Connected to smtp2-de.mail.vip.ukl.yahoo.com. Escape character is '^]'. 220 smtp116.mail.ukl.yahoo.com ESMTP ehlo 250-smtp116.mail.ukl.yahoo.com 250-AUTH LOGIN PLAIN XYMCOOKIE 250-PIPELINING 250-SIZE 41697280 250 8BITMIME

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  • Binary Tree operator overloading and recursion

    - by furious.snail
    I was wondering how to overload the == operator for a binary tree to compare if two trees have identical data at same nodes. So far this is what I have: bool TreeType::operator==(const TreeType& otherTree) const { if((root == NULL) && (otherTree.root == NULL)) return true; //two null trees are equal else if((root != NULL) && (otherTree.root != NULL)) { return((root-info == otherTree.root-info) && //this part doesn't actually do anything recursively... //(root-left == otherTree.root-left) && //(root-right == otherTree.root-right)) } else return false; //one tree is null the other is not } I have a similar function that takes two TreeNode pointers as parameters but I've been stuck on how to convert it to this function.

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  • Python: How do I pass a variable by reference?

    - by David Sykes
    The Python documentation seems unclear about whether parameters are passed by reference or value, and the following code produces the unchanged value 'Original' class PassByReference: def __init__(self): self.variable = 'Original' self.Change(self.variable) print self.variable def Change(self, var): var = 'Changed' Is there something I can do to pass the variable by actual reference? Update: I am coming to the conclusion that while Andrea answered my actual question (Can you... No but you can...), on the subject of pass by reference Blair Conrad is more technically correct. As I understand it the crux is that a copy of a reference is being passed. If you assign that copy, as in my example, then you lose the reference to the original and it remains unchanged. If, however, you 'use' that reference, for example append on a passed list, then the original is changed. I will see how the comments and votes go before choosing the answer people think is the best

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  • Handling session between two pages in iframe-based facebook app.

    - by Ray Yun
    I'm a newbie to iframe based facebook application and stuck with session related problems. There are just two pages in my app. First page got many fb_sig_* parameters from facebook platform but when I click a anchor to next page, those fb_sig_* were lost because this is just direct request from end user's browser not from facebook. So I found that http://forum.developers.facebook.com/viewtopic.php?id=52885. It was told that I should not using cookie and always append every fb_sig* to every anchor. This can be the only solution for my problems? Any side effect like session expiry problem?

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  • Executing certain code for every method call in C++

    - by Luís Guilherme
    I have a C++ class I want to inspect. So, I would like to all methods print their parameters and the return, just before getting out. The latter looks somewhat easy. If I do return() for everything, a macro #define return(a) cout << (a) << endl; return (a) would do it (might be wrong) if I padronize all returns to parenthesized (or whatever this may be called). If I want to take this out, just comment out the define. However, printing inputs seems more difficult. Is there a way I can do it, using C++ structures or with a workaroud hack?

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  • How to set html content in Moodialog

    - by Diego
    Hello, i've just downloaded Moodialog, a Mootools plugin for dialog, but i have a problem. If content is set via parameters it will be text and not html. Can you help me change the function to accept html? I suppose that this is the code to be edit. setContent: function(){ var content = Array.from(arguments); if (content.length == 1) content = content[0]; this.content.empty(); var type = typeOf(content); if (['string', 'number'].contains(type)) this.content.set('text', content); else this.content.adopt(content); return this; }, I tried to edit 'text' in 'html', but it will not work. Thanks for help (and sorry for my bad english).

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  • Ora-01000 - maximum open cursors exceeded error

    - by PeteDaMeat
    I am receiving the following error message within my Delphi/Oracle application "ora-01000 - maximum open cursors exceeded". The code is as follows: begin for i := 0 to 150 do begin with myADOQuery do begin SQL.Text := 'DELETE FROM SOMETABLE'; ExecSQL; -- from looking at V$OPEN_CURSOR a new cursor is added on each iteration for the session Close; -- thought this would close the cursor but doesn't end; end; end; I'm aware I can resolve the problem by simply increasing the number of OPEN_CURSORS parameters, however, I would rather find a solution whereby the cursor is closed after the query is executed. Any ideas? Delphi 2006 BDS Oracle 10g

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  • Java generics: Illegal forward reference

    - by Arian
    Given a generic interface interface Foo<A, B> { } I want to write an implementation that requires A to be a subclass of B. So I want to do class Bar<A, B super A> implements Foo<A, B> { } // --> Syntax error or class Bar<A extends B, B> implements Foo<A, B> { } // --> illegal forward reference But the only solution that seems to work is this: class Bar<B, A extends B> implements Foo<A, B> { } which is kind of ugly, because it reverses the order of the generic parameters. Are there any solutions or workarounds to this problem?

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  • Any good GUI tool to easily create stored procs SQL server 2008 ?

    - by Munish Goyal
    The templates for stored-procs in SSMS do not auto-populate all input columns, again there is manual work involved. I am looking for something like right-click on table and say CREATE stored-proc, and then it allows to pick a template, based on which it can populate the parameters etc. and give check-box in GUI (like table designer, you can easily add/remove a column). Some support for change management with table undergoing alter or otherwise would also be helpful. Currently we manually write all stored-procs, which i think we should be able to save time and labor with automation. Any suggestion on other free 3rd party tools ?

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  • How to set up Webtrends to segment paid search campaigns?

    - by hfidgen
    Hiya, I'm trying to learn how to set up Webtrends Analytics to segment paid search properly. I've dug up the fact that you need to pass "WT.srch=1" over in the url from the advert, but are there other parameters which you can use to segment: Campaign Adgroup Ad network I know you can do this with Google Analtics at the drop of a button using the various UTM tags, but Webtrends seems to use the proprietary WT. tags. Yet I can only find one tag... wtf :P Anyone able to help? Thanks! H

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  • Record locking problem between linux and Windows

    - by PabloG
    I need to run a bunch of old DOS FoxPro / Clipper applications in linux under DOSEMU. The programs access their "databases" located on a network server (could be a Windows or Linux server) Actually, the programs ran fine, but I cannot manage to make the record locking work as supposed: I can run a program in two terminals (or the server and any terminal for instance) and lock the same record in both. Now, I'm using Tiny Core Linux as terminal and Windows XP as server, accesing the shared files via CIFS and the latest DOSEMU (1.4.0), but I tried with various combinations of server (Ubuntu 7 to 9, Damn Small Linux, XP) <- protocol (CIFS, samba, various versions of smbclient) <- client (same as server) with no luck I tried to configure the server part to work without oplocks in samba (after reading the entire O'Reilly Samba book locking chapter in http://oreilly.com/catalog/samba/chapter/book/ch05_05.html ) and in XP (\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters\UseOpportunisticLocking = 0) but the problem persist. Any ideas? TIA, Pablo

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  • encoding of =1 in emails

    - by Maenny
    Hi folks, I have probably a stupid problem. In a script I generate a URL with GET parameters, something like 'www.mydomain.com/index.php?item=1234'. This URL will be sent by PHP through mail() in an UTF-8 encoding (the scriptfile itself also is utf-8). Now each time I have the GET-Parameter with two numbers after the '=' the URL in the email looks like 'www.mydomain.com/index.php?item?34' with a rectangle instead of '=12'. I am sure there is an easy way to fix this? Thanks in advance, Maenny

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  • I want to create a common unit test function to check all functions based on parameter

    - by Nilesh Rathod
    I want to create a common unit test function to check all functions based on parameter for e.g commonmethod(string methodname,string paramter1,....) { .... } what logic should i write inside this method so that by passing a actual function in parameter methodname and then the common method should execute that function and should return the output. i am using entity framework for all functions which has been created in my project and now i dont want to create a separate unit test function for each function.just one function should do the job based on different parameters... is that possible.. ?, if so then please provide me an code for same.. Thanks in advance..!!!

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  • drop down list had zero value

    - by KareemSaad
    I had ddl which in selected changed it execute some code but when i tried to do that it wasn't worked well WHEN i checked the reason i found that ddl in selected value =0 also i made all well and this is my code protected void DDlProductFamily_SelectedIndexChanged(object sender, EventArgs e) { if (DDlProductFamily.DataValueField.Contains("ProductCategory_Id")) using (SqlConnection Con = Connection.GetConnection()) { SqlCommand Com = new SqlCommand("GetListViewByProductCategory", Con); Com.CommandType = CommandType.StoredProcedure; Com.Parameters.Add(Parameter.NewInt("@ProductCategory_Id", DDlProductFamily.SelectedValue.ToString())); SqlDataAdapter DA = new SqlDataAdapter(Com); DA.Fill(dt); DataList1.DataSource = dt; DataList1.DataBind(); } }

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  • How can I easily run different configurations in Eclipse?

    - by Roman
    I have an Java applications which I would like to run with different values of input parameters (specified in the command line). In "Run - Run Configurations" I have created different configurations corresponding to different values of the input arguments. I can run these configurations in the same way (throw "Run - Run Configurations"). But in these case I have to perform to many actions (clicks) to run a particular configuration. Is there a easier (faster) way to do that? For example I expect that I can do it throw "Run - Run as" but in the drop-dawn menu of the "Run as" I see "(Not Applicable)".

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  • Keyboard shortcut for Jump to Definition

    - by Arne Evertsson
    I'm looking for a keyboard only shortcut for Jump to Definition. The built-in shortcut requires the mouse: Cmd + Double click. I've tried to add a regular keyboard shorcut for the Edit / Find / Jump to Defintion menu command, but, alas, it will only work when the method name is selected. I'd like to be able to position the cursor within the method name, class name, or other symbol, and hit something like Cmd+Shift+L. Does anyone know of a solution, perhaps using a script, for the problem? Update: The keyboard shortcut works sometimes and sometimes not. When I position the text cursor on a method call with no parameters and press Cmd+Shift+L it takes me to the definition. But it doesn't work for a method that takes an (id) parameter. However it works if the parameter is an int. I have submitted a bug report to Apple.

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  • AJAX with Ruby on Rails?

    - by Zachary
    This is probably a really dumb question with a simple answer but... I am working on a project where I need to use AJAX to send/receive information. I am using Ruby on Rails (which I am pretty new to), but rather than using the helper methods or the built in functionality in the 'defaults' Javascript file, I need to do this manually in my own Javascript. I believe that ultimately I will want to send a request with a JSON object, then have the controller return another JSON object containing the requested information. The problem is that I cannot seem to find the syntax for sending something to a specific controller method, with parameters, directly from Javascript - everything I Google ends up being tutorials for using the Rails AJAX helper methods.

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  • C#: Making sure parameter has attribute

    - by slayerIQ
    I have an attribute lets call it SomeAttribute and a class i need to make sure the class is passed a type which has SomeAttribute. So this is how i do it now: public class Test() { public Test(SomeType obj) { if(!obj.GetType().IsDefined(typeof(SomeAttribute), false)) { throw new ArgumentException("Errormessage"); } } } But this means that i don't get any errors at compile time but somewhere at runtime, if obj does not have the attribute. Is there a way to specify in the method declaration that the parameter must have some attribute ? So i get errors i compile time when using the wrong parameters.

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  • XMLHttpRequest cross site scripting on same server but differnt port

    - by clamp
    hello, using XMLHttpRequest it is not possible to open a connection to a document on a different domain than where the page itself is hosted. but what about different ports? for example i have a webserver running on my machine listening on port 80 so the webaddress would look like this: http://localhost:80/mypage.html and i have another webserver running on localhost which is meant to process the ajax requests but listens on a different port. so the javascript in mypage.html would look like this: var xmlhttprequest = new XMLHttpRequest(); xmlhttp.open("GET", "http://localhost:1234/?parameters", true); xmlhttp.send(); would this work? or will it give a security exception as well?

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  • How to enforce a namespace in wsdl for inner elements

    - by wsxedc
    I am looking at an example WSDL <definitions xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tns="http://mypackage/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://schemas.xmlsoap.org/wsdl/" targetNamespace="http://mypackage/" name="HelloService"> <types> <xsd:schema> <xsd:import namespace="http://mypackage/" schemaLocation="http://localhost:8081/HelloWebService/HelloService?xsd=1"> </xsd:import> </xsd:schema> </types> <message name="sayHello"> <part name="parameters" element="tns:sayHello"></part> </message> <message name="sayHelloResponse"> <part name="parameters" element="tns:sayHelloResponse"></part> </message> <portType name="Hello"> <operation name="sayHello"> <input message="tns:sayHello"></input> <output message="tns:sayHelloResponse"></output> </operation> </portType> <binding name="HelloPortBinding" type="tns:Hello"> <soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="document"></soap:binding> <operation name="sayHello"> <soap:operation soapAction=""></soap:operation> <input> <soap:body use="literal"></soap:body> </input> <output> <soap:body use="literal"></soap:body> </output> </operation> </binding> <service name="HelloService"> <port name="HelloPort" binding="tns:HelloPortBinding"> <soap:address location="http://localhost:8081/HelloWebService/HelloService"> </soap:address> </port> </service> and the referenced xsd is <?xml version="1.0" encoding="utf-8"?> <xs:schema xmlns:tns="http://mypackage/" xmlns:xs="http://www.w3.org/2001/XMLSchema" version="1.0" targetNamespace="http://mypackage/"> <xs:element name="sayHello" type="tns:sayHello"></xs:element> <xs:element name="sayHelloResponse" type="tns:sayHelloResponse"> </xs:element> <xs:complexType name="sayHello"> <xs:sequence> <xs:element name="arg0" type="xs:string" minOccurs="0"> </xs:element> </xs:sequence> </xs:complexType> <xs:complexType name="sayHelloResponse"> <xs:sequence> <xs:element name="return" type="xs:string" minOccurs="0"> </xs:element> </xs:sequence> </xs:complexType> </xs:schema> When I use SoapUI to generate a request message, it looks like this <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:myp="http://mypackage/"> <soapenv:Header/> <soapenv:Body> <myp:sayHello> <arg0>?</arg0> </myp:sayHello> </soapenv:Body> </soapenv:Envelope> My question is, why doesn't arg0 need a namespace like ?? I am just using this as an example as the element that are children of soapenv always have a namespace prefix, however, the children of these children do not have any prefix. This is the case with soapUI and message sent by Axis2 generated stubs. My questions are: 1. Why aren't there any namespace for arg0? 2. Is there a way to enforce myp prefix on arg0 from WSDL? If so, how? If not, why can't it be done?

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  • MSCT Certification, Exam 70-536, your advices?

    - by Philippe
    At the beginning of the year, I was proposed by my company to take some MS certification exams. Since then, they generously paid for the Self-Paced Training Kit book. I was promised to have some time to study, but the project is running late (a habit around here). Let's face it, I'll have to study on my own time to get this certification. Anyway, my question is simple: what advices do you have in order to study effectively? I'm halfway trough the book, and I feel like I don't remember anything. Especially when the questions are so precise on classes name and parameters...

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  • Mysql SET NAMES UTF8 - how to get rid of?

    - by Nir
    In a very busy PHP script we have a call at the beginning to "Set names utf8" which is setting the character set in which mysql should interpret and send the data back from the server to the client. http://dev.mysql.com/doc/refman/5.0/en/charset-applications.html I want to get rid of it so I set default-character-set=utf8 In our server ini file. (see link above) The setting seems to be working since the relevant server parameters are : 'character_set_client', 'utf8' 'character_set_connection', 'utf8' 'character_set_database', 'latin1' 'character_set_filesystem', 'binary' 'character_set_results', 'utf8' 'character_set_server', 'latin1' 'character_set_system', 'utf8' But after this change and commenting out set names utf8 call still the data starts to come out garbled. Please advise....

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  • Visual Studio XSD Tool: Generate Collections Rather Than Arrays

    - by senfo
    I generated some C# classes from an XSD using the Visual Studio XSD utility and it generated arrays for storing a collection of elements, rather than one of the built-in generic Collection<T> (or related) classes. None of the command line parameters mentioned in xsd /? mention anything about generating collections rather than arrays, but I know that this can be done with web service proxy classes that Visual Studio generates, so I figured it must be possible. Does anybody know how to have the XSD utility generate collection classes rather than arrays?

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