Batching through a table variable may not work for non-default collations

(copied from @seriouz’s comment at https://github.com/aspnet/EntityFramework/issues/6577#issuecomment-264244982)

I have a database with some columns collations set to be case sensitive. Now EF build its query with a temp table, but this temp table does not have the collation on the column so on the insert the database server throws an exception. Until there is a work-around i can not use ef because the regarding columns contain (case sensitive) guids.

I think @seriouz meant to say SaveChanges() fails, as opposed to querying data.

A possible workaround is to disable batching in either the OnConfiguring() method on the DbContext class or on the AddDbContext() method in Startup:

    optionsBuilder => optionsBuilder
        .UseSqlServer(connectionString)
        .MaxBatchSize(1);

cc @AndriySvyryd as FYI

[AndriySvyryd]

@seriouz As a workaround you can specify the collation as part of the store type:

.Property(e => e.FieldGuid).HasColumnType("nvarchar(22) COLLATE SQL_Latin1_General_CP1_CS_AS");

[angularsen]

Workaround: Save one parent entity at a time. It correctly saves related data in its properties.

I didn’t see this workaround mentioned anywhere, but it was very helpful for us.