I've been looking around for a definitive answer as to how to use LINQ to SQL with mySQL but can't seem to come up with anything. Does anyone have any experience / suggestions using the two together? In particular, I would like to avoid using string SQL statements.
Cheers
MySQL isn't directly supported by Microsoft's LINQ to SQL provider, but there are several alternative ways you can use LINQ against MySQL.
Take a look at using LINQ to nHibernate, or see here for LINQ providers against non-Microsoft databases.
Now (as of 2015) you can use the Connector/NET provided by MySQL.
http://dev.mysql.com/doc/connector-net/en/connector-net-tutorials.html
Related
I want to develop a multiuser supporting accounting management application in C#.
I want to use Linq To SQL classes. LINQ to SQL only supports SQL Server/Compact. However is it possible the SQLite people have written their own LINQ provider given the name of the assembly.
I have to use DBMS that is FREE. Which DBMS do you suggest to me?
LIN2SQL = SQL Server. Second class badly written O/R mapper compared to the real contendors (like NHibernate).
LINQ2SQL != LINQ. LINQ is the query integration into the langauge, and supported by pretty much a lot of O/R mappers out there, and some databases.
I have to use Db that is FREE.
Free like for free? What is against sql server? Express edition - 0 USD. And the 4gb "database size limit" does not stop you from writing accounting systems. THat is a LOT of space for accounting data. For many years of accounting data.
If you want to use Linq-to-SQL (which I think is an excellent choice) you have to use some variant of MSSQL. Both Sql Server Compact and Sql Server Express are free to use. If you have a multiuser scenario you will have to go for Sql Server Express as Sql Server Compact doesn't allow multiple simultaneous access.
There are various experimental linq to sql and linq to entity framework providers for other databases(like mysql and postgres) - in my experience they are so immature it is not worth using for anything serious.
For now, I'd suggest you'd look for something else if you cannot use SQL server.
Try the following link:
http://sqlite.phxsoftware.com/
Note that Linq2SQL is not compatible with SQLite, however the link points to an Entity Framework provider for SQLite. EF is kind of like Linq2SQL on steroids. SQLite is very lightweight, so the EF implementation above should work nicely for your needs.
I wish to Implement LINQ-to-SQL as my Data Access Layer. I am using SQL Server. Is there
any Linq-to-SQL framework (commercial or open source) available that can function like
Application Block (caching block, validation, etc..)?
Microsoft provide a Linq to SQL framework. There are plenty of articles about it in the web, e.g.
LINQ to SQL
Using LINQ to SQL (Part 1)
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Is LINQ to SQL DOA?
I am starting a new ASP.Net project which holds all data in a SQL database. I would normally use Linq to SQL to do all my queries, updates and inserts. but as i recently found out Microsoft will no longer develop/support Linq to SQL. What would you use as an alternative?
Does anyone know why they are dropping this, as I have come to like Linq to SQL, and do you know what they will replace it with?
Any information would be great.
Linq to SQL is not dead nor is it being replaced with EF, they have not killed it, feel free to compare and contrast
Linq to SQL
Entity Framework (aka Linq to Entities)
nHibernate or any other ORM
Pick one that works for you and stick with it, neither are dying.
FWIW, Microsoft has more developers working on Linq to SQL than it has working on MVC.net right now
I prefer Linq to SQL because I do not need to support non MSSQL db and its much lighter than EF. It doesn't support every last thing you'd need, but in my opinion (and I may get flamed for this) Linq to SQL is to MVC.net as EF is to webforms.
EF obviously has its advantages over Linq to SQL though, there are somethings that linq to sql just flat out doesn't support (cross db joins, non mssql databases, creating a type based on a view, etc). Every tool has its place.
Some decent comparisons on the two
Oh and StackOverflow was built with linq to sql
if you use ANY technology, prepare for it to eventually fall from favor, and not be the latest technology!
if you don't pick Linq, whatever you use will eventually be "old", and people will be asking if it is worthwhile to learn or use, since there are better things out.
if you are writing software prepare to keep learning new tech and methods, or switch careers.
If you like Linq 2 Sql, then I recommend you try out SubSonic as it works very much like Linq 2 Sql. It's lightweight and your wrapper classes are generated from an existing database. I believe the next version of SubSonic will be supporting Linq as well.
Microsoft is now pushing the Entity Framework in lieu of Linq to SQL:
http://blogs.msdn.com/adonet/archive/2008/10/29/update-on-linq-to-sql-and-linq-to-entities-roadmap.aspx
MSDN Info on Entity Framework:
http://msdn.microsoft.com/en-us/library/aa697427(VS.80).aspx
Update:
More complete list of Entity Framework Resources:
http://blogs.msdn.com/wriju/archive/2009/03/10/ado-net-entity-framework-resources.aspx
And of course the obligatory O'Reilly book on the subject:
http://fyi.oreilly.com/2009/02/introducting-the-adonet-entity.html
Linq to Entities will replace Linq to SQL.
Would someone explain how to get LINQ working with Sqlite.
Here you have an SQL Linq provider for SQLite, and some other DBs
Joe Albahari's LINQPad now supports Sqlite: http://www.linqpad.net/Beta.aspx. The one LINQ tool to rule them all.
The link provided by CMS doesn't work anymore. I have used this one as it now seems to be baked into their SQL lite ADO .NET provider.
Unfortunately they still don't support the designer mode of VS for creating classes :(
Also be aware that SQL Server compact doesn't support the design mode for LINQ classes! However if you want to use the entity framework the designer does work for SQL lite and SQL Server compact :)
Yup there is a SqlLite Linq Provider as mentioned by CMS
Check out SQL server compact and it works well with Linq
There is another thread on SO which you should check
I would like to add that you can use Linq to Sql with SqlLite with a couple of stipulations:
You cannot use the Linq to Sql designer which means you have to hand roll your classes.
You have to be careful not to do certain operation which will result in Sql code which is not supported by SqlLite.
For example, you cannot use FirstOrDefault() in any of your Linq queries because it will result in something like:
select top 1 * from table where ...
Since SqlLite doesn't support the "top 1" syntax, you will gt a runtime Sql error.
Other than that, I have been using Linq to Sql with SqlLite with great success for basic CRUD operations.
You can use this: http://code.google.com/p/dblinq2007.
Although it looks like the project is still in Alpha stage, IMO it is actually very stable now. Of course if you have a huge project, it is better to consider using something else like MySQL or SQL Compact. I don't like SQL Server, because it is too bloated, and offers not many more functionalities over SQL Compact or MySQL
Check this provider:
SqlLite Linq Provider
Also you can consider using SQL Compact which has very good LINQ-to-SQL support.
On this time there is NO good tools to do this!
LINQ providers for SQLite all is in alpha stage (for example:dblinq2007). And it is very big risk to use it in commercial purpose! So maybe in future...
If you want ot use ADO.NET there is good ove: phxsoftware.
There are numerous libraries providing Linq capabilities to C# code interacting with a MySql database. Which one of them is the most stable and usable on Mono?
Background (mostly irrelevant): I have a simple C# (.Net 2.0) program updating values in a MySql database. It is executed nightly via a cron job and runs on a Pentium 3 450Mhz, Linux + Mono. I want to rewrite it using Linq (.Net 3.5) mostly as an exercise (I have not yet used Linq).
The only (free) linq provider for MySql is DbLinq, and I believe it is a long way from production-ready.
There is also MyDirect.Net which is commercial, but I have heard mixed reviews of it's capability.
I've read that MySql will be implementing the Linq to Entities API for the 5.3 version of the .net connector, but I don't know if there's even a timeline for that. In fact, MySql has been totally silent about Entity Framework support for months.
Addendum: The latest release of the MySql Connector/Net 6.0 has support for the EF according to the release notes. I have no idea how stable/useful this is, so I'd love to hear from anybody who have tried it.
According to the Mono roadmap I'm not sure if Linq is available for mono?
At least some of Linq might be available in the very latest release, but Linq to DB is listed for Mono 2.4 (Feb 2009)
Not sure about Mono, but I just started using LightSpeed and that supports LINQ-to-MySQL.
at this time you cannot use linq to sql, you might look into a third party linq mysql provider or linq to entities. linq to sql only works for sql server databases.
LINQ to SQL is simply a ORM layer leveraging the power of expressions to make it easy to construct queries in your code.
If you are just calling adhoc queries for your tool, there is little need to use LINQ, it just adds an extra layer of abstraction to your code.
I have tried the tutorial at http://www.primaryobjects.com/CMS/Article100.aspx. This uses dblinq/dbmetal to generate the data context class and classes for each table.
The code failed at the first attempt with an unhandled exception (MySql.Data.Types.MySqlConversionException: Unable to convert MySQL date/time value to System.DateTime"). Googling revealed this should be easily solved by appending "Allow Zero Datetime=True;" to the connection string.
Unfortionately this turned out not to solve my problem. Thinking the MySQL .Net Connector was to blame I executed the SQL generated by dblinq without the linq2sql intermediary layer using the MySQL Connector. This time no exception occured.
Tables which do not have a date column did work with DbLinq.
So, from my experiment I agree with Adam, DbLinq is a long way from production ready.