Ef code first

EF Code First Model Key Idea How it works? Database Initialize Data Annotation Dmytryi Lebedinskyi

Code First Model 1. Define Simple Entities with connection by ID

2. Add virtual properties for lazy loading of Aggregated Fields EF lazy loading is enabled by default Code First Model

3. Remember to preserve name convention EF Code First uses general agreement about names. Code First Model

4. Create Data Context DbContext is similar to EF general Data Context Code First Model

Code First Model 5. Create a Repositories

6. What about usage? You can work with it same like a general EF Model Code First Model

7. And what is the result? Code First Model

Code First Model 9. Where is Database? Default DB Server is .\SqlExpress

Code First Model 10. Change Database name How to change DB name? App.config or any other Connection String supplied DbConnection Replace the Default Convention

EF Code First Model Key Idea How it works? Database Initialize Data Annotations

Code First Model Database Initializers System.Data.Entity.Database .IDatabaseInitializer <in TContext> CreateDatabaseIfNotExists DropCreateDatabaseIfModelChanges DropCreateDatabaseAlways

Code First Model 1. Create Initializer

Code First Model 2 . Register Initializer

Code First Model 3 . And we have data if no db is created

Since EF Code First CTP5 Data Annotations can be used for DB structure Code First Model KeyAttribute StringLengthAttribute MaxLengthAttribute ConcurrencyCheckAttribute RequiredAttribute TimestampAttribute ComplexTypeAttribute ColumnAttribute (Placed on a property to specify the column name, ordinal & data type) TableAttribute (Placed on a class to specify the table name and schema) InversePropertyAttribute ( Placed on a navigation property to specify the property that represents the other end of a relationship) ForeignKeyAttribute (Placed on a navigation property to specify the property that represents the foreign key of the relationship) DatabaseGeneratedAttribute ( Placed on a property to specify how the database generates a value for the property (Identity, Computed or None) ) NotMappedAttribute ( Placed on a property or class to exclude it from the database)

And Validation Attributes are now also supported Code First Model

And using some MVC Magic we receive Code First Model

Ef code first

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Ef code first