Context submitchanges is not updating the database sex dating in holstein nebraska
My only outstanding question with this: If I’m calling ‘Submit Changes’ clearly I’m wanting to update some values and LINQ knows what classes (Tables) I’m working with at the time – So why is there no check to ensure that a PK is in place – Which should then result in an exception being thrown…answers on a comment please !Over the last few weeks I've been writing a series of blog posts that cover LINQ to SQL.
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Note that if a Product's property values weren't changed by the property assignments above, then the object would not be considered changed and LINQ to SQL would therefore not execute an update for that product back to the database.
For example - if the "Chai" product's unitprice was already $2 and the number of units in stock was 4, then calling Submit Changes() would not cause any database update statements to execute.
When we defined our data model, the LINQ to SQL designer also created a custom Data Context class that provides the main conduit by which we'll query our database and apply updates/changes.
In the example data model we defined above this class was named "Northwind Data Context".
When I target a Compact Edition DB, the only difference is that the field sizes are all 0 (zero).
Here's the SQL generated: INSERT INTO [dbo].[Athletes]([First Name], [Last Name], [Birth Date])VALUES (@p0, @p1, @p2)SELECT CONVERT(Int, SCOPE_IDENTITY()) AS [value]-- @p0: Input NVar Char (Size = 3; Prec = 0; Scale = 0) [XXX]-- @p1: Input NVar Char (Size = 3; Prec = 0; Scale = 0) [YYY]-- @p2: Input Date Time (Size = 0; Prec = 0; Scale = 0) [Null]-- Context: Sql Provider(Sql2005) Model: Attributed Meta Model Build: 3.5.21022.8SELECT [t0].[Athlete ID], [t0].[First Name], [t0].[Last Name], [t0].[Birth Date]FROM [dbo].[Athletes] AS [t0]-- Context: Sql Provider(Sql2005) Model: Attributed Meta Model Build: 3.5.21022.8 This is when targeting a SQL Server Express DB.
For example, I could write the below code to update the price and # of units in stock of the "Chai" product in the database: When I call northwind.Tags: Adult Dating, affair dating, sex dating