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• Entity Framework Auto Generate Key File
• Entity Framework Auto Generate Key Download
• Entity Framework Auto Generate Key In Spring Boot

A key serves as a unique identifier for each entity instance. Most entities in EF have a single key, which maps to the concept of a primary key in relational databases (for entities without keys, see Keyless entities). Entities can have additional keys beyond the primary key (see Alternate Keys for more information).

The Microsoft Entity Framework is an Object Relational Mapping (O/RM) tool that enables you to generate a data access layer from a database automatically. The Entity Framework enables you to avoid the tedious work of building your data access classes by hand.

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By convention, a property named Id or <type name>Id will be configured as the primary key of an entity.

Note

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In order to use the Entity Framework, you need to create an Entity Data Model. You can take advantage of the Visual Studio Entity Data Model Wizard to generate an Entity Data Model from a database automatically. Follow these steps: Right-click the Models folder in the Solution Explorer window and select the menu option Add, New Item. Jan 15, 2016  Key attribute, if applied on the integer column will create the column with the Identity enabled (autoincrement) The unsigned data types (uint) are not allowed in EF 6 as Primary key, while it is allowed in EF Core. But EF Core does not create an Identity column for unsigned data types. Composite Primary Key Entity Framework 6. Entity Framework 6 EF 6. Home Articles Knowledge Base Online Examples. I am trying to add a record to a table and have the primary key be auto generated. I have the StudentID column as primary key, int. This will automatically generate the student ID for you in the database on row insert and increment the ID by 1 for every new row.

Owned entity types use different rules to define keys.

You can configure a single property to be the primary key of an entity as follows:

You can also configure multiple properties to be the key of an entity - this is known as a composite key. Composite keys can only be configured using the Fluent API; conventions will never setup a composite key, and you can not use Data Annotations to configure one.

Primary key name

By convention, on relational databases primary keys are created with the name PK_<type name>. You can configure the name of the primary key constraint as follows:

Key types and values

While EF Core supports using properties of any primitive type as the primary key, including string, Guid, byte[] and others, not all databases support all types as keys. In some cases the key values can be converted to a supported type automatically, otherwise the conversion should be specified manually.

Key properties must always have a non-default value when adding a new entity to the context, but some types will be generated by the database. In that case EF will try to generate a temporary value when the entity is added for tracking purposes. After SaveChanges is called the temporary value will be replaced by the value generated by the database.

Important

If a key property has its value generated by the database and a non-default value is specified when an entity is added, then EF will assume that the entity already exists in the database and will try to update it instead of inserting a new one. To avoid this turn off value generation or see how to specify explicit values for generated properties.

Alternate Keys

Entity Framework Auto Generate Key File

An alternate key serves as an alternate unique identifier for each entity instance in addition to the primary key; it can be used as the target of a relationship. When using a relational database this maps to the concept of a unique index/constraint on the alternate key column(s) and one or more foreign key constraints that reference the column(s).

Tip

If you just want to enforce uniqueness on a column, define a unique index rather than an alternate key (see Indexes). In EF, alternate keys are read-only and provide additional semantics over unique indexes because they can be used as the target of a foreign key.

Alternate keys are typically introduced for you when needed and you do not need to manually configure them. By convention, an alternate key is introduced for you when you identify a property which isn't the primary key as the target of a relationship.

You can also configure a single property to be an alternate key:

Entity Framework Auto Generate Key Download

You can also configure multiple properties to be an alternate key (known as a composite alternate key):

Entity Framework Auto Generate Key In Spring Boot

Finally, by convention, the index and constraint that are introduced for an alternate key will be named AK_<type name>_<property name> (for composite alternate keys <property name> becomes an underscore separated list of property names). You can configure the name of the alternate key's index and unique constraint: