Generate and auto increment the Id in Entity Framework database first, Your Save method should check if the primary (auto incremented key) has a value greater than 0 to see if it is new or not. Alternatively you can You should be calling Add instead of Update as this is a new instance you want to insert into the data store. Your Save method should check if the primary (auto incremented key) has a value greater than 0 to see if it is new or not. Alternatively you can also see if it is already attached.

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  • In the above case, we have declared that the primary key should be an AUTO INCREMENT field
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This is default behavior when we define identity column. Whenever we perform delete operations there will be gaps in records for identity column.

Auto-increment on partial primary key with Entity Framework Core

Let us now define the repository interfaces to store and access the data from the database. We'll be extending our repositories from Spring Data JPA's CrudRepository interface that provides methods for generic CRUD operations.


Entity Framework set auto increment and start value on column that is not primary key

To the Id field under Foo without it making any difference on the migration code. Is there a way to make the Id AI although it is a PPK?

Composite primary key entity framework


Entity framework code first auto increment primary key

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The @ManyToOne annotation is used to define a many-to-one relationship between two entities (directory) in Spring Data JPA. The child entity (https://yamamotonight-m.ru/hack/?patch=9995), that has the join column, is called the owner of the relationship defined using the @ManyToOne annotation.

Then why a new entry does not have the Id set to 11? Is it a kind of limitation or maybe a security feature?


For instance, think of A as a book, and B as pages. A book can have many pages but a page can only exist in one book, forming a one-to-many relationship. The opposite of one-to-many is many-to-one relationship.

Apparently the answer of @IronMan84 correct. But it didn't work for me. I slightly modified it to apply my another condition.

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