Hello,
I'm having some troubles with updating linq to sql entities.
For some reason, I can update every single field of my item entity besides name.
Here are two simple tests I wrote:
[TestMethod]
public void TestUpdateName( ) {
using ( var context = new SimoneDataContext( ) ) {
Item item = context.Items.First( );
if ( item != null ) {
item.Name = "My New Name";
context.SubmitChanges( );
}
}
}
[TestMethod]
public void TestUpdateMPN( ) {
using ( var context = new SimoneDataContext( ) ) {
Item item = context.Items.First( );
if ( item != null ) {
item.MPN = "My New MPN";
context.SubmitChanges( );
}
}
}
Unfortunately, TestUpdateName() fails with the following error:
System.Data.SqlClient.SqlException: Incorrect syntax near the keyword 'WHERE'..
And here's the outputted SQL:
UPDATE [dbo].[Items] SET WHERE ([Id] = @p0) AND ([CategoryId] = @p1) AND ([MPN] = @p2) AND ([Height] = @p3) AND ([Width] = @p4) AND ([Weight] = @p5) AND ([Length] = @p6) AND ([AdministrativeCost] = @p7) -- @p0: Input Int (Size = 0; Prec = 0; Scale = 0) [1] -- @p1: Input Int (Size = 0; Prec = 0; Scale = 0) [1] -- @p2: Input VarChar (Size = 10; Prec = 0; Scale = 0) [My New MPN] -- @p3: Input Decimal (Size = 0; Prec = 5; Scale = 3) [30.000] -- @p4: Input Decimal (Size = 0; Prec = 5; Scale = 3) [10.000] -- @p5: Input Decimal (Size = 0; Prec = 5; Scale = 3) [40.000] -- @p6: Input Decimal (Size = 0; Prec = 5; Scale = 3) [30.000] -- @p7: Input Money (Size = 0; Prec = 19; Scale = 4) [350.0000] -- Context: SqlProvider(Sql2008) Model: AttributedMetaModel Build: 3.5.30729.4926
As you can see, no update is being generated (SET is empty ...) I have no clue why is this happening.
And already in advance ... YES, the table Item has a PK (Id).
Thank you in advance!
Update: It appears that the error is caused by overriding GetHashcode(). This is my current implementation:
return string.Format( "{0}|{1}|{2}|{3}", Name, Id, UPC, AdministrativeCost).GetHashCode( );