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Posted by / 09-Jun-2018 20:26

Linq updating records

Not only that you are never sure if you are not compromising the referential integrity of your database, but if you change your database type from MS SQL Server to Oracle, you will probably have to update all the statements in your data access logic.

An ORM framework is supposed to handle all that for you, but can it do it on the server side, without having to load in memory 10 000 rows of obsolete data?

Issue #3890 When a graph of entities is given to Attach or Update, the state of those entities is set to Unchanged/Modified unless the entity is using key value generation and the key value is not set, in which case the state is set to Added.

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One of the core features of most Object Relational Mapping frameworks is the ability to work with each entity in a single data access context and once a number of changes is accumulated, to generate the appropriate SQL statement for each change and post all statements to the database.

This is quite useful for most scenarios, as the typical data intensive application performs CRUD operations mostly based on user interaction, which means that the volume of the changes is usually not very large.

If having a key value of zero is a legitimate requirement, then you can workaround this until we fix the bug by explicitly setting the state (rather than calling @rowanmiller No, id 0 is not a requirement of my software.

Submit Changes() End Sub Sub Insert Record(sender As Object, e As Grid Record Event Args) Dim db As New Northwind Data Context() Dim c As New Customer() With db.

It allows you to define a LINQ query as if you are retrieving data, but based on its selection to perform updates or deletes.

Here is a simple example of how you can achieve this particular deletion using the Open Access Context in a single line of code: What happens behind the scenes?

As a result, the bulk operations are both incredibly faster and with a minimal memory consumption in comparison with the one-by-one execution still offered by many frameworks as the only choice.

call in order to be applied - they are executed instantaneously!

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