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• Reverting CoreData data

  - by ndg

  I have an NSTableView which is populated via a CoreData-backed NSArrayController. Users are able to edit any field they choose within the NSTableView. When they select the rows that they have modified and press a button, the data is sent to a third-party webservice. Provided the webservice accepts the updated values, I want to commit those values to my persistent store. If, however, the webservice returns an error (or simply fails to return), I want the edited fields to revert to their original values. To complicate matters, I have a number of other editable controls, backed by CoreData, which do not need to resort to this behaviour. I believe the solution to this problem revolves around the creation of a secondary Managed Object context, which I would use only for values edited within that particularly NSTableView. But I'm confused as to how the two MOC would interact with each other. What's the best solution to this problem?

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• T SQL WHERE Clause

  - by johniom

  Hiya Guys, I'm trying to develop some code which pulls latest informtion only. What it is when a user goes into a form there a subtable and everytime they change something it creates a new row in the colum called type12_OriginalNoteID which puts its own unquie number in. Another feild called type12_OriginalNoteID keeps the same number - which keeps track of what the oringal number was before any changes were made. I do have some code which does pull the latest information but it does not pull anything if the user has not made any changes to the form - and thats because the type12_OriginalNoteID is null. The code is as follows ea.type12_NoteID IN (SELECT TOP 1 ea.type12_NoteID FROM UserAssessv1aidsadaptations ea1 WHERE ea.type12_NoteID = ea1.type12_OriginalNoteID ORDER BY ea.type12_UpdatedDate DESC) An example of the data is as follows :- type12_note ID - 12 type12_OriginalNoteID NULL type12_UpdatedDate - 11/03/2010 What would be the solution to show the ifnroamtion if no one has made any changes to the subtable? - adding an if statement to run if type12_OriginalNoteID is null??

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• How to Expression.Invoke an arbitrary LINQ 2 SQL Query

  - by Remus Rusanu

  Say I take an arbitrary LINQ2SQL query's Expression, is it possible to invoke it somehow? MyContext ctx1 = new MyContext("..."); var q = from t in ctx1.table1 where t.id = 1 select t; Expression qe = q.Expression; var res = Expression.Invoke(qe); This throws ArgumentException "Expression of type System.Linq.IQueryable`1[...]' cannot be invoked". My ultimate goal is to evaluate the same query on several different data contexts.

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• Choice of programming language for learning data structures and algorithms

  - by bguiz

  Which programming language would you recommend to learn about data structures and algorithms in? Considering the follwing: Personal experience Language features (pointers, OO, etc) Suitability for learning DS & A concepts I ask because there are some books out there that are programming language-agnostic (written from a Mathematical perspective, and use pseudocode). If I learn from one of these I would like to work out the algorithms in a chosen language. Then, there are other books which introduce DS & A concepts with examples in a particular programming laguage - and I would follow these examples as well. Either way, I have to choose a language, and I would like to stick to one throughout. Which one best fits the bill.

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• Updating Excel Cell with Non-Numeric Data in C#

  - by kbo206

  I have a query that is ExcelQuery = "Update [Sheet1$] set CITIZEN_ID = #" + value + " where CITIZEN_ID = " + value; As you can see, I'm essentially just appending a "#" onto the CITIZEN_ID field. value is a int/numeric value. So if I had "256" in the CITIZEN_ID column it would be converted to "#256" When I execute this I get an OleDbException Syntax error in date in query expression so I surrounded part of the query in single quotes like this, ExcelQuery = "Update [Sheet1$] set CITIZEN_ID = '#" + value + "' where CITIZEN_ID = " + value; With that I get yet another OleDbException this time with, Data type mismatch in criteria expression. I'm guessing for some reason the CITIZEN_ID fields don't want to take anything besides a plain number. Is there any way I can remedy this to get that pound symbol in? Thanks!

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• Learning Algorithms and Data Structures Fundamentals

  - by valya

  Can you recommend me a book or (better!) a site with many hard problems and exercises about data structures? I'm already answering project Euler questions, but these questions are about interesting, but uncommon algorithms. I hardly used even a simple tree. Maybe there is a site with exercises like: hey, you need to calculate this: ... . Do it using a tree. Now do it using a zipper. Upload your C (Haskell, Lisp, even Pascal or Fortress go) solution. Oh, your solution is so slow! Self-education is very hard then you trying to learn very common, fundamental things. How can I help myself with them without attending to courses or whatever?

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• Multilingual best practices on SQL Server, EF and MVC combinations

  - by dengereli

  ASP.NET MVC, resource management is look like enough for application multlingual multiculture support. But I am wondering practices about data. User stories; User set culture as en-US and see all product items in English. User set culture as fr-FR and see all product items in French. User set culture as ru-RU and see all product items in Russian. User doesn't have right change culture settings and application never reach multilingual resources, it will use default language and culture.

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• Problem with update sql with excel

  - by phenevo

  Hi, I have a problem with this query: Update Provinces Set Provinces.DefaultName=T2.Defaultname from Provinces inner join OPENROWSET('Microsoft.Jet.OLEDB.4.0', 'Excel 8.0;Database=C:\provinces.xlsx;HDR=YES', 'SELECT Code, Defaultname FROM [Arkusz1$]') T2 On Provinces.Code = t2.Code where Provinces.Code = T2.Code I get error: Msg 7399, Level 16, State 1, Line 1 The OLE DB provider "Microsoft.Jet.OLEDB.4.0" for linked server "(null)" reported an error. The provider did not give any information about the error. Msg 7303, Level 16, State 1, Line 1 Cannot initialize the data source object of OLE DB provider "Microsoft.Jet.OLEDB.4.0" for linked server "(null)". What is a reason of this unpleasent situation ?

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• Data truncation when retrieving data from MySQL database with prepared statements

  - by KSiimson

  I have a script that retrieves multiple products using prepared statements. Like putting loops into loops, I have prepared statements in prepared statements - so there is a prepared statement for retrieving all products, a prepared statement to retrieve all images for that product, a prepared statement to get all attributes for that products, and so on. This does not work with one MySQLi instance, so I use multiple MySQLi objects that are opened and closed when needed. It usually works fine, but sometimes, especially when displaying multiple products, some data is truncated. For example - MicoLoans becomes MicoLoa. There was an actual spelling mistake here - now when I changed MicoLoans to MicroLoans, the same page displayed MicroLoa... So the same number of characters was truncated from the end. It is sort of consistent where it appears - for example there can be descriptions for 8 products, and description of 1 product is heavily truncated. When I add 9th product, the short description is still truncated for that same product as before. Any ideas?

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• CONTAINSTABLE with wildcard works different in SQLServer 2005 and SQLServer 2008?

  - by musuk

  I have two same databases one on SQLServer 2005 and one on SqlServer 2008, it have same SQL_Latin1_General_CP1_CI_AS Collation, and full text search catalogs have the same settings. These two databases contains table with same data, NTEXT string: "...kræve en forklaring fra miljøminister Connie Hedegaard.." My problem is: CONTAINSTABLE on SQLServer 2008 finds nothing if query is: select * from ContainsTable(SearchIndex_7, Content, '"miljø*"') ct but SQLServer 2005 works perfectly and finds necessary record. SQLServer 2008 finds necessary record if query is: select * from ContainsTable(SearchIndex_7, Content, '"milj*"') ct or select * from ContainsTable(SearchIndex_7, Content, '"miljøminister"') What can be reason for so strange behavior?

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• how to retrieve data in image uri in sd card to read data in byte convertion

  - by narasimha

  hi sir i am implementing upload image click upload button then select into sdcard images i am getting uri File Img = new File(selectedImage.getPath()); System.out.println("2............."+Img); FileInputStream is = null; try { is = new FileInputStream(Img); is.read(buffer); BufferedInputStream bis = new BufferedInputStream(is); Bitmap bm = BitmapFactory.decodeStream(is); bis.close(); is.close(); i got in image uri how can retrieve data in particular image uri in image path above code Img i am new in android then some suggition give me some reply

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• What's the best way to validate EntityFramwork 4.0 classes?

  - by lsb

  Hi! I've done a fair amount of searching but I've yet to find an easy way to validate EntityFramework 4.0 entities passed accross the wire via WCF Data Services. Basically, I want to do something on the client like: Proxy.MyEntities entities = new Proxy.MyEntities( new Uri("http://localhost:2679/Service.svc")); Proxy.Vendor vendor = new Proxy.Vendor(); vendor.Code = "ABC/XYZ"; vendor.Status = "ACTIVE"; // I'd like to do something like the following: vendor.Validate(); entities.AddToVendors(vendor); entities.SaveChanges(); Any help in this regard would be greatly appreciated!

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• Cursors vs Procedures in SQL

  - by CogitoErgoSum

  So, I just learned about CURSORS but still don't exactly grasp them. What is the difference between a cursor and procedure or even a function? So far from the various examples (DECLARE CURSOR ... SELECT ... FROM ...) It seems at most its a variable to hold a query. Is the data real time, or a snapshot of when the cursor was declared? i.e. I have a table with one row and one col with a value of 2. I do DECLARE CURSOR ... SELECT * FROM table1 I then insert a new row with a value of 3. When I run the cursor, would I Just get the one row from before the cursor was declared, or both rows? Thanks

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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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• IN R counting hierarchical data

  - by Alison

  I have a list of counties in each state that received nonattainment status in years 1995-2005. I want to know how many counties in each state each year that received this status. If my data is formatted like this, State1 Country1 YR1 Yr2 Yr3 Yr4... State1 Country2 YR1 Yr2 Yr3 Yr4 State2 County1 Yr1 Yr2..... Each year variable could have a 1 or a zero, since a county may gain or loose this status in a time period. I need to count each year how many counties in each state have nonattainment status (YRx=1), but can't think of how to do it.

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• What Data structure for Reputation Rules in C# (like stackoverflow)

  - by optician

  I am currently building a system which will have entities that will have scores like reputation etc.. I will have a service that will check for certain rules having been triggered, and will perform certain logic if they are triggered. Previously I have used say an Enum for doing this when I have only had to store an id and a description. public enum ShoppingCratCalculation { PartialCalculation = 1, CompleteCalculation =2 } But in this situation I want to carry more information, such as the modification to reputation, all in one place. I'm essentially asking what data structure would be best suited to storing this information, for each rule in the system. 1. Description = string ("User forgot to write a review") 2. DB id = int (23) 3. Rep score modification = int (-5) Maybe a little class (Rule) with these as properties , and then just a list? Does anyone have any best practice suggestions for this kind of struct?

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• Data not displayed first time in android after copying the file from assets to data folder

  - by Thinkcomplete

  Description I have used the code tip from http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/ to copy a pre-filled data file to the target and handled this in a asynch task Problem : On starting the application it gives error and shuts down first time, starting again without any change it works perfectly fine. So first time after the file is copied, the error comes but after that no issues. Please help Code attached:.. private class CopyDatabase extends AsyncTask<String, Void, Boolean> { private final ProgressDialog dialog = new ProgressDialog(BabyNames.this); protected void onPreExecute() { this.dialog.setMessage("Loading..."); this.dialog.show(); } @Override protected Boolean doInBackground(String... params) { // TODO Auto-generated method stub try { namesDBSQLHelper.createDatabase(); return null; } catch(IOException ioe){ ioe.printStackTrace(); } return null; } protected void onPostExecute(final Boolean success){ if (this.dialog.isShowing()){ this.dialog.dismiss(); } } }

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• Speeding up PostgreSQL query where data is between two dates

  - by Roger

  I have a large table ( 50m rows) which has some data with an ID and timestamp. I need to query the table to select all rows with a certain ID where the timestamp is between two dates, but it currently takes over 2 minutes on a high end machine. I'd really like to speed it up. I have found this tip which recommends using a spatial index, but the example it gives is for IP addresses. However, the speed increase (436s to 3s) is impressive. How can I use this with timestamps?

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• Adding Days To Date in SQL

  - by Coding Noob

  I am trying to get data from my Database of those who have upcoming birth days in next few days(declared earlier) it's working fine for days but this query will not work if i add 24 days to current date cause than it will need change in month. i wonder how can i do it declare @date int=10, @month int=0 select * from STUDENT_INFO where DATEPART(DD,STDNT_DOB) between DATEPART(DD,GETDATE()) and DATEPART(DD,DATEADD(DD,@date,GETDATE())) and DATEPART(MM,STDNT_DOB) = DATEPART(MM,DATEADD(MM,@month,GETDATE())) This query works fine but it only checks date between 8 & 18 but if i use it like this declare @date int=30, @month int=0 select * from STUDENT_INFO where DATEPART(DD,STDNT_DOB) between DATEPART(DD,GETDATE()) and DATEPART(DD,DATEADD(DD,@date,GETDATE())) and DATEPART(MM,STDNT_DOB) = DATEPART(MM,DATEADD(MM,@month,GETDATE())) it will return nothing since it require addition in month as well If I Use it like this declare @date int=40, @month int=0 select * from STUDENT_INFO where DATEPART(DD,STDNT_DOB) between DATEPART(DD,GETDATE()) and DATEADD(DD,@date,GETDATE()) and DATEPART(MM,STDNT_DOB) = DATEPART(MM,DATEADD(MM,@month,GETDATE())) than it will return results till the last of this month but will not show till 18/12 which was required

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• Need help configuring SQL Server CE connections string in Fluent NHibernate

  - by Yoav

  Hi, I'm trying to return a session factory using this code: return Fluently.Configure() .Database(MsSqlCeConfiguration.Standard.ShowSql().ConnectionString(path)) .Mappings(m => m.FluentMappings.AddFromAssemblyOf<Project>()) .BuildSessionFactory(); Path is the full path to an .sdf file. And get this exception: System.ArgumentException: Format of the initialization string does not conform to specification starting at index 0. at System.Data.SqlServerCe.ConStringUtil.GetKeyValuePair(Char[] connectionString, Int32 currentPosition, String& key, Char[] valuebuf, Int32& vallength, Boolean& isempty) What am I doing wrong?

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• Core Data: Multiple conditions inside relational aggregate operations

  - by Uzaak

  I have an SQLite table used by Core Data with the following elements: Name: John LastName: Foobar Age: 23 Name: Bob LastName: Baz Age: 37 Name: Peter LastName: Fooqux Age: 32 Name: John LastName: Bar Age: 29 Those are all in a to-many relationship from another object "Company". I need to query the database and retrieve all Company objects with employees called "John" but whose last name does NOT contain "Foo". I did go as far as to make the following predicate: [NSPredicate predicateWithFormat:@"ANY employee.name = 'John'"]; How do I get to filter only by companies whose Johns don't have "Foo" in their last names?

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• to-many Core Data fetch request behaves oddly with a new store

  - by Giao

  I have two entities, Department and Person. Department has a to-many relationship to Person. The Person entity has a hireDate property. I'm using the predicate "count(person) = 0 OR none person.hireDate %@" to find Departments without any Persons in them or Departments that haven't hired anyone since a recent date. When the app first starts up (new user experience) and Departments are inserted and no Person have been inserted, the fetch request with this predicate returns nothing. However, if I create insert a new Person entity and delete it, then save the store, the fetch request will return all the Departments. I've found a work around where, I just insert a new Person and delete it, then save the store, the fetch request as I expected it to work. I've found that inserting a new Person and deleting it without saving will not correct the problem. Is this a bug with Core Data or is this a bug with how I've designed my app?

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• Retrieving data from MySQL in one SQL statement

  - by james.ingham

  Hi all, If I'm getting my data from Mysql like so: $result = $dbConnector->Query("SELECT * FROM branches, businesses WHERE branches.BusinessId = businesses.Id ORDER BY businesses.Name"); $resultNum = $dbConnector->GetNumRows($result); if($resultNum > 0) { for($i=0; $i < $resultNum; $i++) { $row = $dbConnector->FetchArray($result); // $row['businesses.Name']; // $row['branches.Name']; echo $row['Name']; } } Does anyone know how to print the field Name in businesses and how to print the name from branches? My only other alternative is to rename the fields or to call Mysql with two seperate queries. Thanks in advance

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• How to handle concurrency control in dynamic data?

  - by Andrew

  I've been quite impressed with dynamic data and how easy and quick it is to get a simple site up and running. I'm planning on using it for a simple internal HR admin site for registering people's skills/degrees/etc. I've been watching the intro videos at www.asp.net/dynamicdata and one thing they never mention is how to handle concurrency control. It seems that DD does not handle it right out of the box (unless there is some setting I haven't seen) as I manually generated a change conflict exception and the app failed without any user friendly message. Anybody know if DD handles it out of the box? Or do you have to somehow build it into the site?

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• Updating/Inserting multiple rows using jQuery and OData (WCF Data Services)

  - by Pieter

  I have three tables, Template, Fields and TemplateFields. TemplateFields holds the selected fields for each template. I need to update TemplateFields when the user is finished selecting the fields. The only way I can see to do this is by deleting all the TemplateFields for that Template and then add them one by one in separate requests. This is really bad because there is not transaction to fall back onto and there will also be MANY requests. Is there a way of adding multiple 'objects' at once using WCF Data Services? I can then use an Interceptor to update the database.

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