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• DataBinding the AJAX Control Toolkit's Rating Control

  - by Nevada

  I'm attempting to use the AJAX Control Toolkit's Rating control in a DataBinding scenario. I have a ReuseRating column in my database that is a tinyint. It can hold values 1 through 5. Every record in the table has the value set to 1 currently. If I do this in my ItemTemplate everything works fine. I get 1 star filled in on my rating control. <act:Rating ID="ReuseRatingRating" runat="server" CurrentRating='<%# Convert.ToInt16(Eval("ReuseRating")) %>' MaxRating="5" StarCssClass="ratingStar" WaitingStarCssClass="savedRatingStar" FilledStarCssClass="filledRatingStar" EmptyStarCssClass="emptyRatingStar" /> Now I want to DataBind this in my EditTemplate like so. <act:Rating ID="ReuseRatingRating" runat="server" CurrentRating='<%# Convert.ToInt16(Bind("ReuseRating")) %>' MaxRating="5" StarCssClass="ratingStar" WaitingStarCssClass="savedRatingStar" FilledStarCssClass="filledRatingStar" EmptyStarCssClass="emptyRatingStar" /> Note, that I changed my Eval to a Bind in the CurrentRating property. This throws the following error. CS0103: The name 'Bind' does not exist in the current context Can anyone help me out on this one? I've been knocking my head against the wall for a couple of hours now.

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• What is the difference: LoadUserProfile -vs- RegOpenCurrentUser

  - by Will5801

  These two APIs are very similar but it is unclear what the differences are and when each should be used (Except that LoadUserProfile is specified for use with CreateProcessAsUser which I am not using. I am simply impersonating for hive accesss). LoadUserProfile http://msdn.microsoft.com/en-us/library/bb762281(VS.85).aspx RegOpenCurrentUser http://msdn.microsoft.com/en-us/library/ms724894(VS.85).aspx According to the Services & the Registry article: http://msdn.microsoft.com/en-us/library/ms685145(VS.85).aspx we should use RegOpenCurrentUser when impersonating. But what does/should RegOpenCurrentUser do if the user profile is roaming - should it load it? As far as I can tell from these docs, both APIs provide a handle to the HKEY_CURRENT_USER for the user the thread is impersonating. Therefore, they both "load" the hive i.e. lock it as a database file and give a handle to it for registry APIs. It might seem that LoadUserProfile loads the user profile in the same way as the User does when he/she logs on, whereas RegOpenCurrentUser does not - is this correct? What is the fundamental difference (if any) in how these two APIs mount the hive? What are the implications and differences (if any) between what happens IF A user logs-on or logs-off while each of these impersonated handles is already in use? A user is already logged-on when each matching close function (RegCloseKey and UnloadUserProfile) is called?

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• ASP.NET MVC 2: Mechanics behind an Order / Order Line in a edit form

  - by Dr. Zim

  In this question I am looking for links/code to handle an IList<OrderLine> in an MVC 2 edit form. Specifically I am interested in sending a complete order to the client, then posting the edited order back to an object (to persist) using: Html.EditorFor(m = m.orderlines[i]) (where orderlines is an enumerable object) Editing an Order that has multiple order lines (two tables, Order and OrderLine, one to many) is apparently difficult. Is there any links/examples/patterns out there to advise how to create this form that edits an entity and related entities in a single form (in C# MVC 2)? The IList is really throwing me for a loop. Should I have it there (while still having one form to edit one order)? How could you use the server side factory to create a blank OrderLine in the form while not posting the entire form back to the server? I am hoping we don't treat the individual order lines with individual save buttons, deletes, etc. (for example, they may open an order, delete all the lines, then click cancel, which shouldn't have altered the order itself in either the repository nor the database. Example classes: public class ViewModel { public Order order {get;set;} // Only one order } public class Order { public int ID {get;set;} // Order Identity public string name {get;set;} public IList<OrderLine> orderlines {get;set;} // Order has multiple lines } public class OrderLine { public int orderID {get;set;} // references Order ID above public int orderLineID {get;set;} // Order Line identity (need?) public Product refProduct {get;set;} // Product value object public int quantity {get;set;} // How many we want public double price {get;set;} // Current sale price }

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• Lucene complex structure search

  - by archer

  Basically I do have pretty simple database that I'd like to index with Lucene. Domains are: // Person domain class Person { Set<Pair> keys; } // Pair domain class Pair { KeyItem keyItem; String value; } // KeyItem domain, name is unique field within the DB (!!) class KeyItem{ String name; } I've tens of millions of profiles and hundreds of millions of Pairs, however, since most of KeyItem's "name" fields duplicates, there are only few dozens KeyItem instances. Came up to that structure to save on KeyItem instances. Basically any Profile with any fields could be saved into that structure. Lets say we've profile with properties - name: Andrew Morton - eduction: University of New South Wales, - country: Australia, - occupation: Linux programmer. To store it, we'll have single Profile instance, 4 KeyItem instances: name, education,country and occupation, and 4 Pair instances with values: "Andrew Morton", "University of New South Wales", "Australia" and "Linux Programmer". All other profile will reference (all or some) same instances of KeyItem: name, education, country and occupation. My question is, how to index all of that so I can search for Profile for some particular values of KeyItem::name and Pair::value. Ideally I'd like that kind of query to work: name:Andrew* AND occupation:Linux* Should I create custom Indexer and Searcher? Or I could use standard ones and just map KeyItem and Pair as Lucene components somehow?

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• Precompiled headers question

  - by Kotti

  Hello! I am right now reorganizing my project and what recently was a simple application now became a pair of C++ projects - static library and real application. I would like to share one precompiled header between two projects, but face some troubles with setting up the .pdb file paths. Assume my first project is called Library and builds it's .lib file with a corresponding Library.pdb file. Now, the second project is called Application and builds everything into the same folder (.exe and another Application.pdb file). Right now my both projects create their own precompiled headers file (Library.pch and Application.pch) based on one actual header file. It works, but I think it's a waste of time and I also think there should be a way to share one precompiled header between two projects. If in my Application project I try to set the Use Precompiled Header (/Yu) option and set it to Library.pch, it wouldn't work, because of the following error: error C2858: command-line option 'program database name "Application.pdb" inconsistent with precompiled header, which used "Library.pdb". So, does anyone know some trick or way to share one precompiled header between two projects preserving proper debug information?

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• Is there a detailed description of optimizations in the Android build process?

  - by Daniel Lew

  I've been curious as to all the optimizations that go into the building of an .apk. I'm curious because of two things I've tried in the past to bring down the size of my .apk: I have had a few large json assets in projects before, as well as a static sqlite database. I tried bringing down the size of the apk by gzipping them before the build process, but the resulting size is exactly the same. I just today tried pngcrush on my /drawable/ folders. The resulting build was exactly the same size as before. I would think that perhaps #1 could be explained by the zip process, but simply zipping the /drawable/ folders in #2 result in different-sized files. Perhaps the build process runs something akin to pngcrush? Regardless, I was wondering if anyone knew where to find a detailed description of all the optimizations in the Android build process. I don't want to waste my time trying to optimize what is already automated, and also I think it'd help my understanding of the resulting apk. Does anyone know if this is documented anywhere?

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• select & print multiple value from dropdown list

  - by sandy

  hi , in this code how can selected multiple value from dropdown list <?php include ("connect.php"); $member_id = intval($_POST['sector_list']); if($member_id == 0) { // Default choice was selected } else { $res = mysql_query("SELECT * FROM members WHERE MemberID = $member_id LIMIT 1"); if(mysql_num_rows($res) == 0) { // Not a valid member } else { // The member is in the database } } ?> <form method="post" action=""> <input type="hidden" name="sector" value="sector_list"> <select name="sector_list" class="inputstandard" multiple="multiple"> <option value="0">send to</option> <?php $result = mysql_query('SELECT * from members') or die(mysql_error()); while ($row = mysql_fetch_assoc($result)) { echo '<option value="' . $row['MemberID'] . '">' . $row['MemberName']. '</option>'; } ?> </select> </form> assume the drop down list contain on (a,s,d,f,g,h,j,) users selects multiple value ( a,s,j) output = a,s,j not only j ???

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• singleton pattern in Windows Activation Service

  - by Joshua

  Hello I have a few WCF services that are currently being self hosted, in a very basic NT Service. I want to expand my application to add provisioning of WCF Services, and updates, as well as isolation (I want each WCF Service to be in its own AppDomain). These WCF Services contain logic that needs to be run on a regular basis, pinging the database, and getting information from external devices so that when a request comes in the data is readily available. I'm thinking about trying out Windows Activation Service, because i really like the provisioning, and isolation that comes with a managed services infrastructure. If I didn't use WAS I would essentially have to write the same code myself. From what I understand though WAS does not really support the model of having a service that is running before someone actually calls a method on the service. the article I read here MSDN Article Link states "That means in essence that out-of-the-box WAS hosting is not something that is really suited for sessionful or singleton services. It is more suitable for stateless per-call services." it does say that "Out of the box" so I'm wondering if anyone has used WAS to host a WCF service that really behaves more like an NT Service (starting and stopping independantly of having a method called upon it). Or any other ideas would be great. I was planning on writting this infrastructure myself, to host WCF services in a custom ServiceHost, and put their execution in a seporate AppDomain, as well as allow for provision of these services after initial installation, along with updates. However, I would MUCH MUCH MUCH rather not own that code if I don't have to. thanks Joshua

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• php cli script hangs with no messages

  - by julio

  Hi-- I've written a PHP script that runs via SSH and nohup, meant to process records from a database and do stuff with them (eg. process some images, update some rows). It works fine with small loads, up to maybe 10k records. I have some larger datasets that process around 40k records (not a lot, I realize, but it adds up to a lot of work when each record requires the download and processing of up to 50 images). The larger datasets can take days to process. Sometimes I'll see in my debug logs memory errors, which are clear enough-- but sometimes the script just appears to "die" or go zombie on me. My tail of the debug log just stops, with no error messages, the tail of the nohup log ends with no error, and the process is still showing in a ps list, looking like this-- 26075 pts/0 S 745:01 /usr/bin/php ./import.php but no work is getting done. Can anyone give me some ideas on why a process would just quit? The obvious things (like a php script timeout and memory issues) are not a factor, as far as I can tell. Thanks for any tips PS-- this is hosted on a godaddy VDS (not my choice). I am sort of suspecting that godaddy has some kind of limits that might kick in on me despite what overrides I put in the code (such as set_time_limit(0);).

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• Keys and terminology

  - by nabbed

  I have a predicament related to terminology. Our system processes events. Events are dispatched to a node based on the value of some field (or set of fields). We call this set of fields the key. We call the value of that set of fields the key value. What adds confusion is that each event is essentially a bag of key-value pairs (i.e., a hash map). So the word key is used for two different purposes: 1) to describe the set of fields on which the event is dispatched, and 2) as a field name. So if you had a collection of key-value pairs, and a set of those key-value pairs made up a database-style key, what terminology would you use to distinguish those two? (One further complication is that the key on which the event is dispatched is not always unique. For instance, if we dispatch on userid, and that user performs multiple actions, we will process multiple events with the same userid value. So maybe key is the wrong word to describe the set of fields on which we dispatch an event).

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• How to fill DataGridView from nested table oracle

  - by arkadiusz85

  I want to create my type: CREATE TYPE t_read AS OBJECT ( id_worker NUMBER(20), how_much NUMBER(5,2), adddate_r DATE, date_from DATE, date_to DATE ); I create a table of my type: CREATE TYPE t_tab_read AS TABLE OF t_read; Next step is create a table with my type: enter code hereCREATE TABLE Reading ( id_watermeter NUMBER(20) constraint Watermeter_fk1 references Watermeters(id_watermeter), read t_tab_read ) NESTED TABLE read STORE AS store_read ; Microsoft Visual Studio can not display this type in DataGridView. I use Oracle.Command: C# using Oracle.DataAccess; using Oracle.DataAccess.Client; private void button1_Click(object sender, EventArgs e) { try { //my working class to connect to database ConnectionClass.BeginConnection(); OracleDataAdapter tmp = new OracleDataAdapter(); tmp = ConnectionClass.ReadCommand(ReadClass.test()); DataSet dataset4 = new DataSet(); tmp.Fill(dataset4, "Read1"); dataGridView4.DataSource = dataset4.Tables["Read1"]; } catch (Exception o) { MessageBox.Show(o.Message); } public class ReadClass { public static OracleCommand test() { string sql = "select c.id_watermeter, a. from reading c , table (c.read) a where id_watermeter=1"; ConnectionClass.Command1= new OracleCommand(sql, ConnectionClass.Connection); ConnectionClass.Command1.CommandType = CommandType.Text; return ConnectionClass.Command1; } } I tray: string sql = "select r.id_watermeter, o.id_worker, o.how_much, o.adddate_r, o.date_from, o.date_to from reading r, table (r.read) o where r.id_watermeter=1" string sql = "select a.from reading c , Table (c.read) a where id_watermeter=1" string sql = "select a.id_worker, a.how_much, a.adddate_r, a.date_from, a.date_to from reading c , table (c.read) a where id_watermeter=1" string sql = "select c.id_watermeter, a. from reading c , table (c.read) a where id_watermeter=1" Error : Unsuported Oracle data type USERDEFINED encountered Sombady can help me how to fill DataGridView using data from nested table. I am using Oracle 10g XE

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• How to handle ASP.NET application error that occurs on application start and transfer & display erro

  - by Soul_Master

  I know that ASP.NET MVC has error filter attribute to handle specified error type. However, this feature cannot catch any error that occurs when application start. Therefore, I need to add some code to “Application_Error” method for handling this error like the following code. public void Application_Error(object sender, EventArgs e) { // At this point we have information about the error var ctx = HttpContext.Current; var exception = ctx.Server.GetLastError(); var errorInfo = "<br>Offending URL: " + ctx.Request.Url + "<br>Source: " + exception.Source + "<br>Message: " + exception.Message + "<br>Stack trace: " + exception.StackTrace; ctx.Response.Write(errorInfo); Server.ClearError(); } Although, this code will works fine, when normal application error occurs like error that occurs in view page. Nevertheless, it does not work when error occurs on application starting because request and response objects are always null. Next, I try to solve this question by setting default redirect in custom errors like the following code. <customErrors mode="On" defaultRedirect="Scripts/ApplicationError.htm"></customErrors> Unfortunately, it does not work because when application receive redirected request, it try to start application again and it throw exception again. How do to solve this problem? Alternatively, Do you have other idea for handling this error. Thanks, PS. The main reason for creating this handler because I want to display error when application cannot connect to other service like database for caching data on application start.

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• Rich faces and dataTable

  - by ortho

  Hi all :) I have the question regarding rich faces and beans. I have a jsp page that is using richfaces and inside it I have the: rich:extendedDatatable component, that takes data from my MainBean as ArrayList (this bean queries the mySQL and puts results to the ArrayList that populates the dataTable later on). There are 4 columns in datatable, first 3 are h:outputLabels and the last one is checkbox. Now I have a question: how can I get information from selected row ? I mean, when user clicks checkbox, I want to take the id/name or whatever that is associated to this particular row, then when user clicks on Apply changed a4j: button I will update the database and when user logs in back again he will see updated info: e.g. checkbox is selected/not selected now because the user checked that. I believe that is a simple query for someone who worked with it. For me ex. flash developer it would be easy in as3, but here I didnt find the solution yet, please help. Thank you in advance, Kindest regards

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• Episerver Scheduled Job fails (scheduler service)

  - by Igor

  Our scheduled jobs started failing since yesterday with the following error message: CustomUpdate.Execute - System.NullReferenceException: Object reference not set to an instance of an object. at System.Web.Security.Roles.GetRolesForUser(String username) at EPiServer.Security.PrincipalInfo.CreatePrincipal(String username) The scheduled job uses anonymous execution and logs in programmatically using the following call: if (PrincipalInfo.CurrentPrincipal.Identity.Name == string.Empty) { PrincipalInfo.CurrentPrincipal = PrincipalInfo.CreatePrincipal(ApplicationSettings.ScheduledJobUsername); } I have put in some more logging around PrincipalInfo.CreatePrincipal call which is in Episerver.Security and noticed that PrincipalInfo.CreatePrincipal calls System.Web.Security.Roles.GetRolesForUser(username) and Roles.GetRolesForUser(username) returns an empty string array. There were no changes code wise or on the server (updates, etc). I checked that the user name used to run the task is in the database and has roles associated with it. I checked that applicationname is set up correctly and is associated with the user If i run the job manually using the same user it executes with no issues (i know there is a difference between running the job manually and using the scheduler) I also tried creating a new user, that didn’t work either. Has anyone come across the same or similar issue? Any thoughts how to resolve this issue?

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• Making HABTM relationships unique in CakePHP

  - by Andrea

  I have two models, called Book and Tag, which are in a HABTM relationship. I want a couple (book, tag) to be saved only once. In my models I have var $hasAndBelongsToMany = array( 'Tag' => array( 'className' => 'Tag', 'joinTable' => 'books_tags', 'foreignKey' => 'book_id', 'associationForeignKey' => 'tag_id', 'unique' => true ) ); and viceversa, but the Unique flag does not help me; I can still save two times the same couple. How do I do this in CakePHP? Should I declare the couple (book, tag) unique in the database directly, or will this make CakePHP go nuts? Is there a Cakey way to handle this situation? EDIT: I tried making the couple unique with the query (I'm using MySQL) ALTER TABLE books_tags ADD UNIQUE (book_id,tag_id); but this does not work well. When I save more than one tag at a time, everything goes well if all the couples are new. If at least one of the couples is repeated, CakePHP fails to do the whole operation, so it does not save ANY new couple (not even the good ones).

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• how can I add a custom non-DataTable column to my DataView, in a winforms ADO.net application?

  - by Greg

  Hi, How could I (/is it possible) to add a custom column to my DataView, and in this column display the result of a specific calculation. That is, I currently have a dataGridView which has a binding to a DataView, based on the DataTable from my database. I'd like to add an additional column to the dataGridView to display a number which is calculated by looking at this current row plus it's children row. In other words the info for the column isn't just derivable from the row data itself. Specific questions might be: a) where to add the column itself? to the DataView I assume? b) which method / event to trigger the re-calculation of the value of this custom column from ( / how do I control this) Thanks PS. I've also noted if I use the following code/approach I get a infinite loop... // Custom Items DataColumn dc = new DataColumn("OverallSize", typeof(long)); DT_Webfiles.Columns.Add(dc); DT_Webfiles.RowChanged += new DataRowChangeEventHandler(DT_Row_Changed); private static void DT_Row_Changed(object sender, DataRowChangeEventArgs e) { e.Row["OverallSize"] = e.Row["OverallSize"] ?? 0; e.Row["OverallSize"] = (long)e.Row["OverallSize"] + 1; } What other approach could avoid this looping. i.e. currently I'm saying update the value of the custom column when the row changes, however after then changing the row it triggers antoher 'row has changed' event...

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• SqlException: User does not have permission to perform this action.

  - by Oskar Kjellin

  I have been using my website (ASP.NET MVC) in visual studio but now I want to host it on my server. I published from visual studio onto the network share to be used. The server is running Windows Home Server, IIS 6 and SQL Server 2008 R2 (express). In Microsoft SQL Server Management Studio, I've attached the database and made sure that the user IUSR_SERVER is owner of the db. I also made sure that the user Network Service has access. The Web Site is configured in IIS to run anonymously as IUSR_SERVER. I have granted write and read access to IUSR_SERVER as well as Network Service and made sure that nothing is read only. The web.config has this connectionstring: <connectionStrings> <remove name="ApplicationServices" /> <add name="ApplicationServices" connectionString="Data Source=.\SQLExpress;Integrated Security=True;Initial Catalog=MyDatebase" providerName="System.Data.SqlClient" /> </connectionStrings> However, I cannot browse my web site. I only get this error: Server Error in '/' Application. User does not have permission to perform this action. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: User does not have permission to perform this action. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [SqlException (0x80131904): User does not have permission to perform this action.] System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +4846887 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +194 Feels like I've tried everything. Would be very grateful for your aid in this.

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• How to code a URL shortener?

  - by marco92w

  I want to create a URL shortener service where you can write a long URL into an input field and the service shortens the URL to "http://www.example.org/abcdef". Instead of "abcdef" there can be any other string with six characters containing a-z, A-Z and 0-9. That makes 56 trillion possible strings. My approach: I have a database table with three columns: id, integer, auto-increment long, string, the long URL the user entered short, string, the shortened URL (or just the six characters) I would then insert the long URL into the table. Then I would select the auto-increment value for "id" and build a hash of it. This hash should then be inserted as "short". But what sort of hash should I build? Hash algorithms like MD5 create too long strings. I don't use these algorithms, I think. A self-built algorithm will work, too. My idea: For "http://www.google.de/" I get the auto-increment id 239472. Then I do the following steps: short = ''; if divisible by 2, add "a"+the result to short if divisible by 3, add "b"+the result to short ... until I have divisors for a-z and A-Z. That could be repeated until the number isn't divisible any more. Do you think this is a good approach? Do you have a better idea?

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• how to return multiple array items using json/jquery

  - by Scarface

  Hey guys, quick question, I have a query that will usually return multiple results from a database, while I know how to return one result, I am not sure how to return multiple in jquery. I just want to take each of the returned results and run them through my prepare function. I have been trying to use 'for' to handle the array of data but I don't think it can work since I am returning different array values. If anyone has any suggestions, I would really appreciate it. JQUERY RETRIEVAL for(i=0; i < json.rows; i++) { $('#users_online').append(online_users(json[i])); $('#online_list-' + count2).fadeIn(1500); } PHP PROCESSING $qryuserscount1="SELECT active_users.username,COUNT(scrusersonline.id) AS rows FROM scrusersonline LEFT JOIN active_users ON scrusersonline.id=active_users.id WHERE topic_id='$topic_id'"; $userscount1=mysql_query($qryuserscount1); while ($row = mysql_fetch_array($userscount1)) { $onlineuser= $row['username']; $rows=$row['rows']; if ($username==$onlineuser){ $str2= "<a href=\"statistics.php?user=$onlineuser\"><div class=\"me\">$onlineuser</div></a>"; } else { $str2= "<b><a href=\"statistics.php?user=$onlineuser\"><div class=\"others\">$onlineuser</div></a></b>"; } $data['rows']=$rows; $data['entry']=$str1.$str2; }

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• Access denied error on select into outfile using Zend

  - by Peter

  Hi, I'm trying to make a dump of a MySQL table on the server and I'm trying to do this in Zend. I have a model/mapper/dbtable structure for all my connections to my tables and I'm adding the following code to the mappers: public function dumpTable() { $db = $this->getDbTable()->getAdapter(); $name = $this->getDbTable()->info('name'); $backupFile = APPLICATION_PATH . '/backup/' . date('U') . '_' . $name . '.sql'; $query = "SELECT * INTO OUTFILE '$backupFile' FROM $name"; $db->query( $query ); } This should work peachy, I thought, but Message: Mysqli prepare error: Access denied for user 'someUser'@'localhost' (using password: YES) is what this results in. I checked the user rights for someUser and he has all the rights to the database and table in question. I've been looking around here and on the net in general and usually turning on "all" the rights for the user seems to be the solution, but not in my case (unless I'm overlooking something right now with my tired eyes + I don't want to turn on "all" on my production server). What am I doing wrong here? Or, does anybody know a more elegant way to get this done in Zend?

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• How do I pass a callback function to sqlite3_exec on iOS 5.1?

  - by John Doh

  I am new to both xcode/iOS/Objective-C and sqlite. I am trying to teach myself the basics - and I would like to use the sqlite3 wrapper "sqlite3_exec" for a select query. For some reason, I can't find a simple example anywhere of someone doing this. Basically, the method has a parameter (the third one) for a callback function: int sqlite3_exec( sqlite3*, /* An open database */ const char *sql, /* SQL to be evaluated */ int (*callback)(void*,int,char**,char**), /* Callback function */ void *, /* 1st argument to callback */ char **errmsg /* Error msg written here */ ); That's fine. I'm no stranger to callbacks. However, I just can't seem to get the syntax down right. I took over one of the view controllers in my iPad (iOS 5.1) xcode (4.3) project, and made the changes shown below: #import "SecondViewController.h" #import "sqlite3.h" #import "AppState.h" @interface SecondViewController () @end @implementation SecondViewController - (int)myCallback:(void *)a_parm argc:(int)argc argv:(char **)argv column:(char **)column { return 0; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. //grab questionnaire names char *sql = "select * from QST2Main order by [Name]"; char *err = nil; sqlite3 *db = [[AppState sharedManager] getgCn]; sqlite3_exec(db, sql, myCallback, nil, &err); } Essentially, I want to run a query when this view first loads, to store some data for later use. But, XCode doesn't like the "myCallback" usage at the bottom there. It says: Undeclared Use of Identifier 'myCallback.' That method is declared in the header file, and I've even tried making it static. Nothing seems to make this error go away. I know I must be doing something fundamentally wrong here, but for the life of me I can't figure out what - I can't even find other code samples in this area that could help me figure out what I'm missing. Many thanks!

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• ORM model and DAO in my particular case

  - by EugeneP

  I have the DB structure as follows: table STUDENT (say, id, surname, etc) table STUDENT_PROPERTIES (say, name_of_the_property:char, value_of_the_property:char, student_id:FK) table COURSE (id, name, statusofcourse_id) table STATUSOFCOURSE (id, name_of_status:char ('active','inactive','suspended' etc)) table STUDENT_COURSE (student_id,course_id,statusofcourse_id) Let's try to pick up domain objects in my database: Student and Course are main entities. Student has a list of courses he attends, also he has a list of properties, that is all for this student. Next, Course entitity. It may contain a list of students that attend it. But in fact, the whole structure looks like this: the starting point is Student, with it's PK we can look a list of his properties, then we look into the STUDENT_COURSE and extract both FK of the Course entity and also the Status of the combination, it would look like "Student named bla bla, with all his properties, attends math and the status of it is "ACTIVE". now, quotation 1) Each DAO instance is responsible for one primary domain object or entity. If a domain object has an independent lifecycle, it should have its own DAO. 2) The DAO is responsible for creations, reads (by primary key), updates, and deletions -- that is, CRUD -- on the domain object. Now, first question is What are entities in my case? Student, Course, Student_Course, Status = all except for StudentProperties? Do I have to create a separate DAO for every object?

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• Merge replication server side foreign key violation from unpublished table

  - by Reiste

  We are using SQL Server 2005 Merge Replication with SQL CE 3.5 clients. We are using partitions with filtering for the separate subscriptions, and nHibernate for the ORM mapping. There is automatic ID range management from SQL Server for the subscriptions. We have a table, Item, and a table with a foreign key to Item - ItemHistory. Both of these are replicated down, filtered according to the subscription. Item has a column called UserId, and is filtered per subscription with this filter: WHERE UserId IN (SELECT... [complicated subselect]...) ItemHistory hangs off Item in the publication filter articles. On the server, we have a table ItemHistoryExport, which has a foreign key to ItemHistory. ItemHistoryExport is not published. Entries in the Item and ItemHistory tables are never deleted, on the server or the client. However, the "ownership" of items (and hence their ItemHistories) MAY change, which causes them to be moved from one client subscription/partition to another from time to time. When we sync, we occasionally get the following error: A row delete at '48269404 - 4108383dbb11' could not be propagated to 'MyServer\MyInstance.MyDatabase'. This failure can be caused by a constraint violation. The DELETE statement conflicted with the REFERENCE constraint "FK_ItemHistoryExport_ItemHistory". The conflict occurred in database "MyDatabase", table "dbo.ItemHistoryExport", column 'ItemHistoryId'. Can anyone help us understand why this happens? There shouldn't ever be a delete happening on the server side.

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• SQLiteDataAdapter Fill exception C# ADO.NET

  - by Lirik

  I'm trying to use the OleDb CSV parser to load some data from a CSV file and insert it into a SQLite database, but I get an exception with the OleDbAdapter.Fill method and it's frustrating: An unhandled exception of type 'System.Data.ConstraintException' occurred in System.Data.dll Additional information: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints. Here is the source code: public void InsertData(String csvFileName, String tableName) { String dir = Path.GetDirectoryName(csvFileName); String name = Path.GetFileName(csvFileName); using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + dir + @";Extended Properties=""Text;HDR=No;FMT=Delimited""")) { conn.Open(); using (OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM " + name, conn)) { QuoteDataSet ds = new QuoteDataSet(); adapter.Fill(ds, tableName); // <-- Exception here InsertData(ds, tableName); // <-- Inserts the data into the my SQLite db } } } class Program { static void Main(string[] args) { SQLiteDatabase target = new SQLiteDatabase(); string csvFileName = "D:\\Innovations\\Finch\\dev\\DataFeed\\YahooTagsInfo.csv"; string tableName = "Tags"; target.InsertData(csvFileName, tableName); Console.ReadKey(); } } The "YahooTagsInfo.csv" file looks like this: tagId,tagName,description,colName,dataType,realTime 1,s,Symbol,symbol,VARCHAR,FALSE 2,c8,After Hours Change,afterhours,DOUBLE,TRUE 3,g3,Annualized Gain,annualizedGain,DOUBLE,FALSE 4,a,Ask,ask,DOUBLE,FALSE 5,a5,Ask Size,askSize,DOUBLE,FALSE 6,a2,Average Daily Volume,avgDailyVolume,DOUBLE,FALSE 7,b,Bid,bid,DOUBLE,FALSE 8,b6,Bid Size,bidSize,DOUBLE,FALSE 9,b4,Book Value,bookValue,DOUBLE,FALSE I've tried the following: Removing the first line in the CSV file so it doesn't confuse it for real data. Changing the TRUE/FALSE realTime flag to 1/0. I've tried 1 and 2 together (i.e. removed the first line and changed the flag). None of these things helped... One constraint is that the tagId is supposed to be unique. Here is what the table look like in design view: Can anybody help me figure out what is the problem here?

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• Variant datatype library for C

  - by Joey Adams

  Is there a decent open-source C library for storing and manipulating dynamically-typed variables (a.k.a. variants)? I'm primarily interested in atomic values (int8, int16, int32, uint, strings, blobs, etc.), while JSON-style arrays and objects as well as custom objects would also be nice. A major case where such a library would be useful is in working with SQL databases. The most obvious feature of such a library would be a single type for all supported values, e.g.: struct Variant { enum Type type; union { int8_t int8_; int16_t int16_; // ... }; }; Other features might include converting Variant objects to/from C structures (using a binding table), converting values to/from strings, and integration with an existing database library such as SQLite. Note: I do not believe this is question is a duplicate of http://stackoverflow.com/questions/649649/any-library-for-generic-datatypes-in-c , which refers to "queues, trees, maps, lists". What I'm talking about focuses more on making working with SQL databases roughly as smooth as working with them in interpreted languages.

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