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• Repository Pattern with Entity Framework 3.5 and MVVM

  - by Ravi

  I am developing a Database File System. I am using - .Net framework 3.5 Entity Framework 3.5 WPF with MVVM pattern The project spans across multiple assemblies each using same model. One assembly,let's call it a "server", only adds data to the database using EF i.e. same model.Other assemblies (including the UI) both reads and writes the data.The changes made by server should immediately reflect in other assemblies. The database contains self referencing tables where each entity can have single OR no parent and (may be) some children. I want to use repository pattern which can also provide some mechanism to handle this hierarchical nature. I have already done reading on this on Code Project. It shares the same context(entities) everywhere. My question is - Should I share the same context everywhere? What are the advantages and disadvantages of doing that?

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• How to implement paging for datagrid using LINQ to Entities in wpf?

  - by Levelbit

  I'm new in wpf. My main problem is to understand how DataGrid works with its datacontext. It would help me a lot because I don't know how to make a universal paging usercontrol for all my datagrids in the projects for different database tables. DataGrid converts received DataContext from object to some kind of list. How it is implemented. I tried to do some casting from object to IQueryable to generalize thinig because base class of every entity in the entity model is EntityObject class. But it doesen't work in runtime although I don't receive complains at design time.

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• Cannot iterate of a collection of Anonymous Types created from a LINQ Query in VB.NET

  - by Atari2600

  Ok everyone, I must be missing something here. Every LINQ example I have seen for VB.NET anonymous types claims I can do something like this: Dim Info As EnumerableRowCollection = pDataSet.Tables(0).AsEnumerable Dim Infos = From a In Info _ Select New With {.Prop1 = a("Prop1"), .Prop2 = a("Prop2"), .Prop3 = a("Prop3") } Now when I go to iterate through the collection(see example below), I get an error that says "Name "x" is not declared. For Each x in Infos ... Next It's like VB.NET doesn't understand that Infos is a collection of anonymous types created by LINQ and wants me to declare "x" as some type. (Wouldn't this defeat the purpose of an anonymous type?) I have added the references to System.Data.Linq and System.Data.DataSetExtensions to my project. Here is what I am importing with the class: Imports System.Linq Imports System.Linq.Enumerable Imports System.Linq.Queryable Imports System.Data.Linq Any ideas?

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• Unique Keys not recognized by Entity Framework

  - by David Pfeffer

  I have two tables, Reports and Visualizations. Reports has a field, VisualizationID, which points to Visualization's field of the same name via a foreign key. It also has a unique key declared on the field. VisualizationID is not nullable. This means the relationship has to be 0..1 to 1, because every Reports record must have a unique, not null Visualizations record associated with it. The Entity Framework doesn't see it this way. I'm getting the following error: Error 113: Multiplicity is not valid in Role 'Report' in relationship 'FK_Reports_Visualizations'. Because the Dependent Role properties are not the key properties, the upper bound of the multiplicity of the Dependent Role must be *. What's the problem here? How can I make the EF recognize the proper relationship multiplicity?

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• Adding a NavigationBar to UITableViewController programmatically?

  - by Tony

  I am trying to create a uitableviewcontroller as a modal viewcontroller to edit some settings. I am creating the tableviewcontroller in code and the thing i am struggling with currently is how to correctly add a navigation bar to the controller which will have a "Done" button on it that: a) doesnt appear on top of the tableview and b) does not scroll with the tableview?? This happens when i add the navbar to the contoller with: [self.view addSubview:navigationBar]; This adds a navbar to the controller which goes on top and obscures the tables first row and also scrolls with the view? I also thought about simply using a uiviewcontroller with a separate tableview however i like the funcitonality of automatically scrolling the tableview when editing a textfield that the tableviewcontroller gives you. Just cant figure how to setup this navbar?? thx

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• How to update correctly an Entity Model after changes of database structure?

  - by Slauma

  I've made some changes in the table structure and especially the relationships between tables in my SQL Server database. Now I want to update my Entity model based on this new database structure. Right clicking on the edmx file I find the option "Update model from database". But when I do this I get kind of a 50% update: The new columns appear in the Entity classes but I am confused about a lot of navigation properties which are still there in the model although the corresponding foreign key relationships do not exist anymore in the database. Am I doing something wrong? Or is there another option to update the model including deletion of navigation properties? Or do I have to delete those navigation properties manually in the model files? I am using Entity Framework Version 1 (VS 2008 SP1). Thanks for help in advance!

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• Putting data from local SQL database to remote SQL database without remote SQL access enabled (PHP)

  - by Shyam

  Hi, I have a local database, and all the tables are defined. Eventually I need to publish my data remotely, which I can do easily with PHPmyadmin. Problem however is that my remote host doesn't allow remote SQL connections at all, so writing a script that does a mysqldump and run it through a client (which would've been ideal) won't help me here. Since the schema won't change, but the data will, I need some kind of PHP client that works "reverse". My question is if such a client exists and what would be recommended to use (by experience). I just need an one way trip here, from my local database (Rails) to the remote database (supports PHP), preferable as simple and slick as possible. Thank you for your replies, comments and feedback!

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• Repository Pattern with Entity Framework 3.5

  - by Ravi

  I am developing a Database File System. I am using - .Net framework 3.5 Entity Framework 3.5 WPF with MVVM pattern The project spans across multiple assemblies each using same model. One assembly,let's call it a "server", only adds data to the database using EF i.e. same model.Other assemblies (including the UI) both reads and writes the data.The changes made by server should immediately reflect in other assemblies. The database contains self referencing tables where each entity can have single OR no parent and (may be) some children. I want to use repository pattern which can also provide some mechanism to handle this hierarchical nature. I have already done reading on this on Code Project. It shares the same context(entities) everywhere. My question is - Should I share the same context everywhere? What are the advantages and disadvantages of doing that?

  Read the article

• Repository Pattern with Entity Framework 3.5

  - by Ravi

  I am developing a Database File System. I am using - .Net framework 3.5 Entity Framework 3.5 WPF with MVVM pattern The project spans across multiple assemblies each using same model. One assembly,let's call it a "server", only adds data to the database using EF i.e. same model.Other assemblies (including the UI) both reads and writes the data.The changes made by server should immediately reflect in other assemblies. The database contains self referencing tables where each entity can have single OR no parent and (may be) some children. I want to use repository pattern which can also provide some mechanism to handle this hierarchical nature. I have already done reading on this on Code Project. It shares the same context(entities) everywhere. My question is - Should I share the same context everywhere? What are the advantages and disadvantages of doing that?

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• Fiscal year handling strategies in database design

  - by Sapphire

  By fiscal year I mean all the data in the database (in all tables) that occurred in the particular year. Lets say that we are building an application that allows user to choose from different years. What way of implementing this would you prefer, and why: Separate fiscal year data based on multiple separate database instances (for example, on every fiscal year start you could create a new instance with no data) Have everything in one database, but with logic that automatically separates records from different years. Personally, I have "seen" both methods, and I would choose the second. The only argument I can think of for the first method is to have less records in case that these are really big databases - but still, you could "archive" old records by joining them in summaries or by some other way. What do you think?

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• Printing an external file in its own printing routine

  - by Yawn.

  I basically have an application that generates reports in a .html file, I use a .html file for the ease of making tables and formatting text. Now I would like to introduce a way of printing the reports from my program. Because I use a .html file, the formatting would not the correct if I was to print it directly from my application (as far as I know). For this reason, I would like to print it just like my web browser would have in order to keep the tabular data intact and the text formatting. Does anyone know a way to do this? Thank you.

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• Using npgsql with SSIS

  - by Flash

  Hi, I am using npgsql as the ADO.NET provider in SSIS to connect to Postgres and create some workflows. I am able to connect to postgres but am unable to use the "Table or view" data access mode to list the tables and views. I have to resort to using "SQL command" data access mode. For the "table or view" access mode, the log shows that the last call is GetDataSourceInformation and it returns successfully. After that there is a close connection. Has anyone successfully used "Table or view" data access mode using npgsql? Thanks, Flash

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• ASP.NET MVC Pass mutiple params from getJson to controller

  - by andyJ

  Hi, I am making a call to a controller action in javascript using the getJson method. I need to pass two parameters to my action method on the controller, but I am struggling to do so. I do not fully understand the routing tables and not sure if this is what I need to use to get this working. Please see example below of what I am trying to do. var action = "<%=Url.Content('~/Postcode/GetAddressResults/')%>" + $get("Premise").value + "/" + $get("SearchPostcode").value $.getJSON(action, null, function(data) { $("#AddressDropDown").fillSelect(data); }); This is my route which I don't understand how to make use of... routes.MapRoute( "postcode", "Postcode/GetAddressResults/{premise}/{postcode}", new { controller = "Motor", action = "GetAddressResults", premise = "", postcode = "" });

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• SQL Reporting Services - Subreports Broken into multiple columns

  - by devin

  Hi, I inherited an SQL Reporting Services .rdl project from somebody and need help fixing some functionality. In each row of the report, there is a subreport. In order to save space the subreport is divided into 3. Such that in each row of the report, it splits the data of the subreport into 3 smaller tables. Right now, it fills these 3 subreports horizontally. (ie. if the result has 9 values, the first subtable will have 1, 4 & 7, the second subtable will have 2, 5 & 8, etc) Is there a way to have it fill the subtables vertically? (ie. the first subtable would have 1,2 & 3) Thanks!

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• Check username and password in LINQ query

  - by b0x0rz

  this linq query var users = from u in context.Users where u.UserEMailAdresses.Any(e1 => e1.EMailAddress == userEMail) && u.UserPasswords.Any(e2 => e2.PasswordSaltedHash == passwordSaltedHash) select u; return users.Count(); returns: 1 even when there is nothing in password table. how come? what i am trying to do is get the values of email and passwordHash from two separate tables (UserEMailAddresses and UserPasswords) linked via foreign keys to the third table (Users). it should be simple - checking if email and password mach from form to database. but it is not working for me. i get 1 (for count) even when there are NO entries in the UserPasswords table. is the linq query above completely wrong, or...?

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• 'ORA-01031: insufficient privileges' error received when inserting into a View

  - by Patrick K

  Under the user name 'MY_ADMIN', I have successfully created a table called 'NOTIFICATIONS' and a view called 'V_NOTIFICATIONS'. On the 'V_NOTIFICATIONS' view I have successfully created a trigger and a package that takes what the user attempts to insert into the view and inserts it into the table. The 'V_NOTIFICATIONS' trigger and package also perform the update and delete functions on the table when the user attempts to perform the update and delete functions on the view. I have done this with many views in the project I am currently working on, as many views sit over the top of many different tables, however when attempting to insert a record into this view I receive an 'ORA-01031: insufficient privileges' error. I am able to insert directly into the table using the same code that is in the package, but not into the view. Any help on this would be greatly appreciated.

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• Grails GORM (Hibernate) query

  - by bsreekanth

  Hello, I'm trying to do the below sql statement in GORM select * from table1 where table1.x not in (select x from table 2 where y='something'); so, I have two tables, and needs to find the entries from table 1 which are not in table 2. In Grails def xx= table2.findByY('something') def c = table1.createCriteria() def result= c.list { not ( in('x', xx) ) } the syntax is wrong, and I'm not sure how to simulate not in sql logic. As a learning point, if someone can also tell me why minus (-) operator in grails/groovy doesn't work with list. I tried getting x and y seperately, and doing x.minus(y), but it doesn't change the list. I saw an explanation at http://stackoverflow.com/questions/1754576/groovy-on-grails-list-not-working , but I would expect the list defined are local. thank you so much.

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• Disable eclipselink caching and query caching - not working?

  - by James

  I am using eclipselink JPA with a database which is also being updated externally to my application. For that reason there are tables I want to query every few seconds. I can't get this to work even when I try to disable the cache and query cache. For example: EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("default"); EntityManager em = entityManagerFactory.createEntityManager(); MyLocation one = em.createNamedQuery("MyLocation.findMyLoc").getResultList().get(0); Thread.sleep(10000); MyLocation two = em.createNamedQuery("MyLocation.findMyLoc").getResultList().get(0); System.out.println(one.getCapacity() + " - " + two.getCapacity()); Even though the capacity changes while my application is sleeping the println always prints the same value for one and two. I have added the following to the persistence.xml <property name="eclipselink.cache.shared.default" value="false"/> <property name="eclipselink.query-results-cache" value="false"/> I must be missing something but am running out of ideas. James

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• Is there a way to get programmatic access to the columns of a ActiveReports detail section?

  - by Seth Spearman

  Hello, I have a report in Data Dynamics ActiveReports for .NET. In this report I am programmatically setting the ColumnCount property of the detail section to X. The detail section has one databound textbox. The ColumnDirection property of the detail section is set to AcrossDown and the and then the data binding mechanism automatically fills across with data after setting the DataSource and DataMember. Here is the code... Public Sub RunReport Dim count As Integer = 0 ' ... get count Detail1.ColumnCount = count Me.DataSource = ds Me.DataMember = ds.Tables(0).TableName End Sub That code works fine and the data is automatically filled across the report. Now I need to alter the report and circle or highlight one of the items that is auto-filled across columns in the report. I cannot find any way to programmatically access the auto-generated columns so I can turn on a border or draw a circle or something. Any ideas how I would do that? Seth

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• JPA Entity (in multiple persistence-unit) in OSGi (Spring DM) Environnement is confusing me.

  - by Vincent Demeester

  Hi, I'm a bit confused about a strange behavior of my JPA's related objects. I have three bundle : The User bundle does contain some user-related objects, but mainly the User object. The Energy bundle does contain some energy-related objects, and particularly a ConsumptionTerminal which contains a List of User. The Index bundle does contain an Index object that has no dependency at all. My OSGi environment is the following : A DataSource bundle that provide 2 services : dataSource and jpaVendorAdapter. The three bundles. They consume dataSource and jpaVendorAdapter. Their module-context.xml file look like : And they all have a persistence.xml file : User <?xml version="1.0" encoding="UTF-8"?> <persistence> <persistence-unit name="securityPU" transaction-type="JTA"> <jta-data-source>java:/securityDataSourceService</jta-data-source> <class>net.nextep.amundsen.security.domain.User</class> <!-- [...] --> <exclude-unlisted-classes>true</exclude-unlisted-classes> <properties> <property name="eclipselink.logging.level" value="INFO" /> <property name="eclipselink.ddl-generation" value="create-tables" /> <property name="eclipselink.ddl-generation.output-mode" value="database" /> <property name="eclipselink.orm.throw.exceptions" value="true" /> </properties> </persistence-unit> </persistence> Energy <?xml version="1.0" encoding="UTF-8"?> <persistence> <persistence-unit name="energyPU" transaction-type="JTA"> <jta-data-source>java:/securityDataSourceService</jta-data-source> <class>net.nextep.amundsen.security.domain.User</class> <class>net.nextep.amundsen.energy.domain.User</class> <!-- [...] --> <exclude-unlisted-classes>true</exclude-unlisted-classes> <properties> <property name="eclipselink.logging.level" value="INFO" /> <property name="eclipselink.ddl-generation" value="create-tables" /> <property name="eclipselink.ddl-generation.output-mode" value="database" /> <property name="eclipselink.orm.throw.exceptions" value="true" /> </properties> </persistence-unit> </persistence> Index : This one has the most simple persistence.xml with just the Index class (no shared Class). I'm using named @PersistenceUnit annotation like @PersitenceUnit(name = 'securityPU') (for the User bundle). And finally, I'm using EclipseLink as Jpa provider and Spring DM (+ Spring DM Server in the development process) The problem is the following : When the User bundle is deployed, I'm able to persist User objects. When the User bundle and Energy bundles are both deployed, I'm not able to persist User objects (neither the Energy object). But I don't have any exception at all ! There is no problem at all with the Index bundle. The bug is dataSource independent (I tried with PostgreSQL and MySQL so far). My first conclusion was that the <class>net.nextep.amundsen.security.domain.User</class> in both persistence unit was causing the trouble. I tried without it (and hiding the User dependent object in the Energy bundle) but it failed too. I'm a bit confused about that bug. I'm also not quite sure about the transaction management in this context. I wasn't the one who designed this architecture (but I tell my intern OK without testing it.. shame on me) but if I could understand this bug and maybe fix it without rewrite the bundle (and break my intern work), I would appreciate. Am I doing something wrong ? (it's obvious, but what..) Did I miss something while reading documentation ? By the way, I'm also looking for some best practices or advices when it comes to JPA, EclipseLink (or whatever JPA Provider) and Spring DM (and OSGi in general). I found interesting slides from Mike Keith about this topic (by browsing Stackoverflow).

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• MySQL Query Select using sub-select takes too long

  - by True Soft

  I noticed something strange while executing a select from 2 tables: SELECT * FROM table_1 WHERE id IN ( SELECT id_element FROM table_2 WHERE column_2=3103); This query took approximatively 242 seconds. But when I executed the subquery SELECT id_element FROM table_2 WHERE column_2=3103 it took less than 0.002s (and resulted 2 rows). Then, when I did SELECT * FROM table_1 WHERE id IN (/* prev.result */) it was the same: 0.002s. I was wondering why MySQL is doing the first query like that, taking much more time than the last 2 queries separately? Is it an optimal solution for selecting something based from the results of a sub-query? Other details: table_1 has approx. 9000 rows, and table_2 has 90000 rows. After I added an index on column_2 from table_2, the first query took 0.15s.

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• ADD COLUMN to sqlite db IF NOT EXISTS - flex/air sqlite?

  - by Adam

  I've got a flex/air app I've been working on, it uses a local sqlite database that is created on the initial application start. I've added some features to the application and in the process I had to add a new field to one of the database tables. My questions is how to I go about getting the application to create one new field that is located in a table that already exists? this is a the line that creates the table stmt.text = "CREATE TABLE IF NOT EXISTS tbl_status ("+"status_id INTEGER PRIMARY KEY AUTOINCREMENT,"+" status_status TEXT)"; And now I'd like to add a status_default field. thanks! Thanks - MPelletier I've add the code you provided and it does add the field, but now the next time I restart my app I get an error - 'status_default' already exists'. So how can I go about adding some sort of a IF NOT EXISTS statement to the line you provided?

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• JQuery Tablesorter memorizeSortOrder widget

  - by echedey lorenzo

  Hi, I've found this code in the internet: $.tablesorter.addWidget({ id: "memorizeSortOrder", format: function(table) { if (!table.config.widgetMemorizeSortOrder.isBinded) { // only bind if not already binded table.config.widgetMemorizeSortOrder.isBinded = true; $("thead th:visible",table).click(function() { var i = $("thead th:visible",table).index(this); $.get(table.config.widgetMemorizeSortOrder.url+i+'|'+table.config.headerList[i].order); }); } // fi } }); Found in: http://www.adspeed.org/2008/10/jquery-extend-tablesorter-plugin.html I would like to memorize the sorting of my ajax tables so on each update (table changes completely so there is no append) it keeps sorted the as it was. Question is.. how can use this? $("#tablediv").load( "table.php", null, function (responseText, textStatus, req) { $("#table").trigger("update"); } ); What changes do I need?

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• C# SQL Statement transformed TO LINQ how can i translate this statement to a working linq

  - by BlackTea

  I am having trouble with this I have 3 Data tables i use over and over again which are cached I would like to write a LINQ statement which would do the following is this possible? T-SQL VERSION: SELECT P.[CID],P.[AID] ,B.[AID], B.[Data], B.[Status], B.[Language] FROM MY_TABLE_1 P JOIN ( SELECT A.[AID], A.[Data], A.[Status], A.[Language] FROM MY_TABLE_2 A UNION ALL SELECT B.[AID], B.[Data], B.[Status], B.[Language] FROM MY_TABLE_3 B ) B on P.[AID] = B.[AID] WHERE B.[Language] = 'EN' OR B.[Language] = 'ANY' AND B.STATUS = 1 AND B.[Language] = 'EN' OR B.[Language] = 'ANY' AND B.STATUS = 1 Then i would like it to create a result set of the following Results: |CID|AID|DATA|STATUS|LANGUAGE

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• C# where does the dbml file come from?

  - by 5YrsLaterDBA

  Learning C# and learing Linq now. have lots of qestions about it. Basically I need a step by step tutorial. I suppose the dbml file is the configuration file of the database. I double click it and VS will open it with kind of design diagram. I can create/delete/modify table here? I can use add new item to add the Linq to SQL Classes to get a dbml file? what's next? generate tables in database? generate sql script? generate cs files? when? how?

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