Convert SQL Sub Query to In to Linq Lambda. How do I convert the following SQL statement into Lambda Expression or Linq Query? The following query get the single most recent Answer for each Question. Or to phrase it another way, get each Question with the newest Answer. HI, Is there any tool available to convert sql query to linq quey?Let me know the url to download. THANKS IN ADVANCE.
There is a tool called, but be careful: transliterating from SQL to LINQ can give you the. For instance, suppose you want all purchases of $1000 or greater paid for in cash or by customers who live in Washington. Here's the query in SQL: SELECT p. FROM Purchase p LEFT OUTER JOIN Customer c INNER JOIN Address a ON c.AddressID = a.ID ON p.CustomerID = c.ID WHERE (a.State = 'WA' p.CustomerID IS NULL) AND p.ID in ( SELECT PurchaseID FROM PurchaseItem GROUP BY PurchaseID HAVING SUM (SaleAmount) 1000 ) How would translate this to LINQ? The wrong way is to transliterate the query into LINQ, trying to reproduce the outer and inner joins, subquery and group clause.
The right way is to map your original query (in English) directly into LINQ, leveraging LINQ's linear flow of data and association properties: I want all purchases. From p in db.Purchases.of $1000 or greater. Where p.PurchaseItems.Sum (pi = pi.SaleAmount) 1000.paid for in cash. Where p.Customer null.or by customers who live in Washington p.Customer.Address.State 'WA' Here's the final query: from p in db.Purchases where p.PurchaseItems.Sum (pi = pi.SaleAmount) 1000 where p.Customer null p.Customer.Address.State 'WA' select p More info.
If you are like me and have worked for years building somewhat complex queries using t-SQL but are also trying to learn and use LINQ2SQL then you know that it can be frustrating. Frustrating because the syntax is different and learning curve is a little more than it should be. I also know that LINQ2SQL provides a lot of benefits that I should take advantage of. I know of a great tool that converts linq to sql but I often wonder if there is a product that goes from sql to Linq.
I found one such tool and must say it works very well. As with any conversion tool it does not always work flawlessly but the time it does save is worth the small cost. This tool is called- You can download the version and try it free for 30 days and you will quickly realize that it is worth the $60.00 Once you have installed it and created a new connection to your sql database. Then write your select statement in the left window and then click on the convert sql to Linq. The application will take your SQL statement and convert it to LINQ and also generate a class (they call it a template) that contains your result.
This class includes all your properties and the generating of a function for you to add the records to. Below is a quick example of the tool. From here you can copy the code into your project and start programming something more exciting.
You should change objects to actual data types in the class Added Bonus: This tool will convert to C# or vb.net as well. Looking for quality web hosting? Look no further than! David Bauernschmidt I live in the historical triangle of Virginia where I am married with two daughters. I have spent over 13 years working for a Fortune 500 company in the computer area.
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