DotNet Brother - .Net Online Training : Advantages and disadvantages of LINQ over Stored procedures
http://pankajtiwarii.blogspot.com/2012/09/advantages-and-disadvantages-of-linq_3.htmlThe real value of LINQ comes is to apply the same query to an SQL database, a DataSet, an array of objects in memory and to many other types of data as well. Disadvantages: LINQ sends the entire query to the DB hence takes much network traffic but the stored procedures sends only argument and the stored procedure name
Ritesh Kesharwani: Table Value Parameter with LINQ, (LINQ for Stored Procedure that has datatable as an input parameter)
http://riteshkk2000.blogspot.com/2010/10/table-value-parameter-with-linq-linq.htmlFriday, October 01, 2010 Table Value Parameter with LINQ, (LINQ for Stored Procedure that has datatable as an input parameter) Table Value Parameter with LINQ, (LINQ for Stored Procedure that has datatable as an input parameter) If you are using LINQ to SQL with SQL server database then Visual Studio will not allow you to drag your SP into dbml file like you do for other simple SP and also Visual Studio will not able to generate the code for this
Entity Framework, LINQ and Model-First for the Oracle Database
In this portion of the lab, you will execute a LINQ query with a lambda expression against the EMPLOYEE entity, then map a stored procedure to execute an update against all rows selected. In this tutorial, you will learn how to use Oracle Database and these three technologies with Microsoft Visual Studio and Oracle Data Provider for .NET (ODP.NET)
Linq Error: ... no supported translation to SQL
- 2014 EE Annual Survey People who viewed this question also found these questions helpful: ADODB SQL Recordset Error Answer by Rey Obrero (capricorn1) Question: Hello Working with Access 2013 32-bit. But these PDF files are also prone to corruption and any external threat like virus attacks, improper storage can hit PDF file integrity.This type of damages can make crucial PDF files inaccessible
Language Integrated Query (LINQ) to SQL
Click here for larger image Figure 1 - LINQ to SQL Data Class Design Surface Test Driving LINQ to SQL through ExamplesNow that we've covered the background let's use a couple of examples of LINQ to SQL. As the example will show, you can use instance of objects, make modifications to them, and the changes that you make are tracked in a change set and pushed back to the database
This identifier can be a convenience, as in the following example, or it can enhance performance by storing the results of an expression so that it does not have to be calculated multiple times. Note: If you are using Visual Studio, you can use the Object Relational Designer to create methods mapped to stored procedures and user-defined functions
I think it would be helpful for the EF team to hear your feedback, because I think what we are both asking for is an entirely reasonable and common use case. If the relationship was IQueryable, or even if there was access to the active context associated with the entity to write your own queries against it (although that does violate the separation of persistence concerns, which may or may not be an issue), then it allows you to do something like the above simply and elegantly
LINQ: use stored proc or Ad-hoc?
Of course, the strongest argument for using SP's is the obvious one: You happen to work in a place where they don't allow any other kind of access to the DB. Whether or not I abandon using the Enterprise Library in favor of the EF remains to be seen but I have had an overal positive experience with what I have seen thus far
Unwrapping LINQ to SQL
It also generates the entity classes that you have placed on the entity designer one class each.All classes are generated as partial classes, so you can add additional functionality to the model by creating a new source file and implementing a partial class by the same name. A number of event methods are also implemented as partial methods so you can override change events for each field by simply implementing a partial class
Reader Level: Article LINQ to SQL Performance Considerations By Joe Pitz on Apr 01, 2010 LINQ, LINQ to SQL, LINQ to SQL Performance, This article focuses on some of the performance issues while working with LINQ to SQL
The hopes that collection and SQL table querying could be interfused were disappointed, as such constructs will inevitably produce horrible SQL execution plans. But people doing back end? How do you get them on board? With Java 8 coming so late and incomplete, I fear that most java projects will become cobol-like snails
This is not a replacement for parameterized queries, just another tool you can add to your arsenal.Figure 1: Filtering Data in Grid View ControlGetting Started:In order to get started, unzip the included project and open the solution in the Visual Studio 2008 IDE. For example, if one had an SQL Data Source configured to work with a stored procedure that pulled back all of the accounts for one zip code, the developer could use filter expressions to limit the account data shown by a range to dates, or a last name
http://riteshkk2000.blogspot.com/2010/08/error-unknown-return-type-return-types.htmlQuick workaround if you are in a hurry...In SSMS, temporarily alter your stored proc by cutting out the majority of code so that you just have the final select in place. The SQL Server feature that attempts to derive the Meta data of the function reports no columns for the result shape, so the designer defaults to thinking it only has the single int return value
My degrees are in Math (BA and MA) and Physics (BA) and in addition to this blog and my "day job" for Wrox, you'll find me helping as many readers as I can in the p2p.wrox.com forums. The DataContext Object Again, the DataContext object manages the transactions that occur with the database that you are working with when working with LINQ to SQL
Speeding up data access by using Linq to SQL or EF by Jason Young
Additionally, the generated queries are optimized based on the exact query being performed instead of making generic SQL that is optimized for multiple scenarios. First page query - If the underlying provider has an optimization for using the SQL TOP command, the first page of data you query will be able to avoid a common table expression
LINQ Overview
Query Expressions Query expression is nothing but a LINQ query, expressed in a form similar to that of SQL with query operators like Select, Where and OrderBy. LINQ offers the facility of joining several data sources in a single query as well as breaking complex problems into a set of short queries easy to debug
Static Type Safety In the preceding queries, if we had declared the state variable as an integer rather than a string, the query would fail at compile-time rather than run-time. For writing applications, my personal experience is a LINQ-enabled data access layer (using an API such as LINQ to SQL or Entity Framework) cuts the data access development time by more than a half, as well as making maintenance far easier
Hi, I wonder, is there some tool that transforms SQL procedures to LINQ? :-) I want to use LINQ but I have so much work done in SQL that would be great to transform my SQL code to LINQ. Why would you want to do that in the first place? Furthermore, about your question, LINQ does not have concepts for every thing MS SQL Server exposes through its SQL, neither ( I think, can be wrong ) can a lambda expression for an expression tree provide some flow control, at least, not as T-SQL can
There are two things we want to do in order to address this in future versions: Expand the range of patterns and standard BCL methods we recognize in LINQ expressions. This blog post expands on the second approach: It is actually possible for us to improve our LINQ implementation so that all functions defined in the EDM and in the store, and even user defined functions, can be mapped to CLR methods with homologous signatures
SQL to LINQ
Thanks, Miguel 07-02-2008, 06:56 AM Application Development Re: SQL to LINQ Not an answer to your question, but a question: LINQ will translate what you throw at it into an expression tree, tree which will be re-evaluated to produce an SQL statement. Why would you want to do that in the first place? Furthermore, about your question, LINQ does not have concepts for every thing MS SQL Server exposes through its SQL, neither ( I think, can be wrong ) can a lambda expression for an expression tree provide some flow control, at least, not as T-SQL can
LINQ to SQL Performance Considerations - CodeProject
I wanted to see what impact writing LINQ to SQL had on the overall development and test cycle time and wanted to evaluate the impact this new code had on the performance and response time of the application. The stored procedure returns all tests that were failed or cancelled, which test step the test was failed or cancelled at and what the percentage failed was (meaning that in some cases a tester could fail or cancel a test, for the same reason, more than one time a day
Linqer Version 4.0 for .NET 4.0 Microsoft performed multiple LINQ enhancements in .NET Framework 4.0, especially for LINQ to Entities, which is reflected in Linqer 4.0
Can we convert all SQL scripts to Linq-to-SQL expressions or there is any limitation?
If the SPs are largely wrappers around single DML statements, then the translation is almost certainly possible, but if more advanced T-SQL is used (e.g. Remembering any times the SP does significant filtering work on the database much of that filtering may end up on the client, so needing to move far more data from server to client
zainnab 26 Oct 2007 6:39 AM I was wondering if anyone would get the reference to Hackers hehehe Glen 22 Jan 2008 8:51 PM I have a complex stored proc that i would like to run but can not be generated as it contains either temp tables or nested loops. Linq will change his won signature or he will do nothing ( you will do erease the current store Procedures and readd this ) ? zainnab 15 Sep 2008 12:14 PM Yep if the stored proc signature changes you have to re-add the proc to your model so the app is aware of the change JNick 15 Sep 2008 2:05 PM Can I specified to the dbml to regenerate the designer.cs, each time I build the project ? zainnab 18 Sep 2008 10:15 AM Well, yes and no
Of course your project may turn out to be really heavy on database side operations that are best performed on the SQL server level rather than in the application level. Having an ORM layer between you and the database takes away a lot of boilerplate code, allows you to enjoy the fruits of the work of lot of people thinking and solving issues in the data layer domain for quite some time
Regarding your third question, about the update of the object, currently, OpenAccess requires the updated object to be loaded in memory (here you can find details). The first one would check whether the required condition is met, the second one would load the objects that need to be updated in the memory and the third one will persist the changes to the database
The ability to define data model classes that can be independent of the underlying database schema gives you much more agility as you build your application (since you can change the underlying column names without having to update your code). I was wondering if you had thought of providing selections of your blogs as PDF docs for download, so that we could have, for example, this LINQ series of posts all together in one place in chronological order
The thing to remember is that these kind of dynamic expressions are probably not all that common in the front end or middle tier layers of an application where you do have access to the data model. Since CompanyName has been changed that change is written to the database, but all the NULL values for the fields that weren't retrieved don't have any effect
What sort of impact will this have on the use of obfuscators such as DotFuscator? Will we need to exclude all ORM classes from obfuscation? Clayton Powell - Monday, August 27, 2007 11:45:43 PM I was wondering if you could give some advice on some practical aspects for building a good business logic layer. At the very basic, while working on a multi tier application you fetch the data and pass it on to front end (In this process we lose the datacontext and associated tracking)
View 3 Replies View Related DataSource Controls :: Calling Function In Linq Query Apr 8, 2010 I have a problem here.In my database I store member status in 1 and 0, when it come to my gridview I need change 1 and 0 to active and inactive. Is it possible to access all three tables in the same query? View 10 Replies View Related DataSource Controls :: Finding A Field In A Linq Query Mar 1, 2010 I have a field name as a string and i want to find it in a linq query
linq-to-sql: Could not translate expression
Unfortunately SQL Server seems to not have a function to get back the result value of a default constraint expression and then saving the expression in case of constant values is also a little bit strange. But these PDF files are also prone to corruption and any external threat like virus attacks, improper storage can hit PDF file integrity.This type of damages can make crucial PDF files inaccessible
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