LINQ-to-SQL had several ways, including a visualizer add-in, to view the generated SQL from an IQueryable.
I can't find the equivalent for Entity Framework 4. Nothing on StackOverflow, no blogs. How is it done?
Preferably, I'd like to be able to do it in code and without having to actually execute the query just to see it.
Thanks!
there are several approaches to looking at the sql.
Free
On the ObjectQuery do .ToTraceString() that will show u the sql generated for the query.
Download ef tracing provider written by one of the EF team members. EF Tracing Provider
Linq To Entities visualizer which you can download here.
LinqPad
Sqlserver profiler
Commercial
Efprof.com
If you can't get any of the other solutions to work, you could try using the SQL Server Profiler if you have access to the SQL Machine.
Within SQL Server Management Studio you can do the following:
Tools -> SQL Server Profiler.
Create a new Trace and run your code and you should see the queries come across. You can create some filters so you don't see the security / audit stuff which you probably don't care about.
Hi there is this visualizer...but I could not get it to work for me...you could try it..I would recommend LINQPad for viewing your queries you can setup your ef connection and execute your queries.
Related
I am using LINQ to SQL for much of the data access layer and am trying to view and tune the underlying SQL used. Does anyone know a good mechanism to intercept the SQL used by C# LINQ and/or replace it with a more tuned query?
I highly recommend using LINQPad to analyze and optimize your LINQ. You can display generated SQL and check also how long certain query took.
You can also use it with existing project that uses Entity Framework. See more details here.
The DataContext itself has a Log property which is a TextWriter, using this you can write out to whatever you want be it the framework TraceClasses or something Like Log4Net or NLog
I'm using Ado.Net Data Entity Model to add records to a local Sql Compact database every second. I want to sync it to a database on the server.
Can you point me in the right direction please?
do you have to write to both databases? how about setting up a replication between the databases?
http://msdn.microsoft.com/en-us/library/ms171850.aspx
The Microsoft Sync Framework was designed for this scenario.
We are using Sync framework in our projects . we have implemented sync in sql server and PG SQL , It works reasonably well for us . In addition we have implemented batching too.
To start with refer this documentation and sample code
http://code.msdn.microsoft.com/sync/Release/ProjectReleases.aspx?ReleaseId=4835
This will show you how to synchronize data between multiple sql server databases. You can also customize the 'increments' stored procedures to take custom parameters and filter data based on these parameters (for instance people the client-user is planning to visit).
I will also suggest that you use a reflector to decompile Sync framework code in case you see wierd errors - sometimes it is not possible to figure out where the error is till you see the exception getting caught in the framework code. Redgate works perfectly for me!
Let me know if you need more help!
I'm opening a discussion here on a subject I couldn't find any answer good enough to be called a final answer: MySQL and .NET.
While I know there is a lot of ways to make this connection, I'm trying to find a list of pros and cons of each approach.
I've been using ADO.NET with the MySQL NETconnector since the beggining of my project, and everything was ok when the database was new and didn't have many records. But now I'm facing a situation where the number of records grows exponentially, and I found other way of querying against the database, which is the ODBC connector. Using the ADO.NET + NETConnector solution I had my O/RM and didn't have to write my queries, while ODBC makes my code look awful now (since I didn't switch completely to ODBC, I have Linq queries and plain SQL queries inside my code).
Is there any solution (free or not) where I can have both an O/RM without the need of writing SQL queries myself and the speed of ODBC?
What you should be doing is using the MySQL ADO.NET Connector and storing your queries in the database in the form of stored procedures. Version 6.0 of the MySQL connector also supports The Entity Framework. If you are interested in using the Entity Framework, check out this link which describes how to set that up.
NHibernate
Update to Comments
NHibernate Proxy Generators
It is a byte code generator for your object model that allows NHibernate to perform lazy loading and other operations. The link provided explains the benefits.
Castle and LinFu are two different implementations of those Proxy Generators.
While NHibernate does not have coincide documentation all the information on how to use it, is on the internet. This could be a barrier to usability for some people though. I understand more about NHibernate because of my past experience with Hibernate.
I'm using Entity Framework Code First and I'd like to be able to record all the SQL queries generated by the DbContext. In Linq to sql there was a DB log and I can't seem to find it in EF. I could then drop them in a log or output it to the page.
I'm using the version 4.1.0.0 of the EntityFramework Assembly.
Your best bet would be to use the Entity Framework Profiler, although it's unfortunately not free.
You can also manually get the SQL it will generate by running a ToString() on the IQueryable itself, but that will have to be done on a per-query basis.
One final option is that if you are using MS Sql Server as your backend, you can load up the Sql Server Profiler (that comes with Sql Server Management Studio I believe) and log the sql statements from there.
Miniprofiler a free alternative to entity framework profiler that will allow you to trace all sql queries made during web requests
With tools like EF it becomes more important than ever to use the SQL Server Profiler, and it should be the primary tool used for this type of situations, if it was important when we actually wrote the queries it is even more important now that these tools build the queries for us, it's a must not only for debugging but also for optimization
I'll just leave it here.
public class Context : DbContext
{
public Context(string connectionString) : base(connectionString)
{ Database.Log = Console.Write; }
}
im just starting to learn LINQ and at the same time im working on a research project for school on using link to entities with oracle and DB2 im trying to find a tool or addon that i can use to test my result sets so that i can run a linq query and see the resulting data i have seen LINQ pad but it seems to be set up for microsoft sql server and compact is there a similar tool that i can use to test against alternate databases out there or a way to setup linq pad to be used with foreign databases
So you are just looking for a tool to see linq queries get executed, and their results?
If you want to take the "profiling" approach Entity Framework Profiler (http://efprof.com/) would do the trick. It allows you to see linq statements get executed, time spent querying, sql generated, as well as see the result set that is returned. Its not a test tool by any means... its free for 30 days and after that you will need to pay for a license.
I think you would be better off by using MS Unit Test framework and just validating the results programmatically.