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6 mar 2013 · command.CommandText = "UPDATE Student(LastName, FirstName, Address, City) VALUES (@ln, @fn, @add, @cit) WHERE LastName='" + lastName + "' AND FirstName='" + firstName+"'"; You should write it like this: command.CommandText = "UPDATE Student. SET Address = @add, City = @cit Where FirstName = @fn and LastName = @add";
Referential Constraint Actions are the actions that the database takes if an attempt is made to delete or update a primary key currently being referenced by a foreign key in another table.
8 maj 2023 · EF Core helps minimize roundtrips by automatically batching together all updates in a single roundtrip. Consider the following: C#. Copy. var blog = context.Blogs.Single(b => b.Url == "http://someblog.microsoft.com");
11 kwi 2023 · In this tutorial you update related data by updating foreign key fields and navigation properties.
20 cze 2013 · SQL:2011 Spec. There are five options for ON DELETE and ON UPDATE that can apply to the FOREIGN KEY. These are called <referential actions>, directly from the SQL:2011 spec. ON DELETE CASCADE: if a row of the referenced table is deleted, then all matching rows in the referencing table are deleted.
8 maj 2023 · ExecuteUpdate and ExecuteDelete are a way to save data to the database without using EF's traditional change tracking and SaveChanges () method. For an introductory comparison of these two techniques, see the Overview page on saving data.
1 cze 2021 · I am trying to update a table and its related entities but the child entities are not updating. I don't know if the child entities should update automatically, or if I need to manually update them....
