Data annotations composite key12/8/2023 ![]() ![]() You have to specify the column names or the configuration is going to assume the column names are ProductID_ShortDescription. You can tell EF CF about a composite key through the Key attribute or FluentAPI. Sounds like you want a complex type AND want the complex type to be recognized as the key by using the convention of appending ID on the end of the property name. implement required methods for IDynamicSqlSequence interface. Please keep in sync!!! // If the Hibernate bug gets fixed, these should all be (name= "sql_seq_gen",strategy= ".SqlSequenceGenerator" (generator= "sql_seq_gen" (length= 5,name= "LEVE元_ID" ) private int level3Id Level2 (properties= "level2Parent.level1Name,level2Name",ĭefaultOrder= "$ (descriptionProperties= "level2Parent.level1Name,level2Name" ) private Level2 level3Parent // These field annotations are duplicated from the entity class due to a Hibernate bug. This is optional, you can include it or not based on your display This declares a convenient way to display the associated children.Level1, this is a static query, so it is included as a parameter here. The highest key in use now and return the next available key. A key associated with ORM-mapped objects that identifies their primary key identity within the database, as well as their unique identity within a Session. This is a custom sequence generator that uses an SQL query to find.This solution will give you the correct behavior on the programming side while giving you an incorrect database design. Only the UserId property should be marked with the Key attribute. Parameters= Parameter (name= "id_query",value= "select max(LEVEL1_ID) + 1 from LEVEL1" ) } (generator= "my_seq_gen" ) private int level1Id (length= 20,name= "LEVEL1_NAME",unique= true,nullable= false ) // String level1Name (mappedBy= "level2Parent" ) // 3 private Collection level1Children Adding the Key attribute to the UserName property will cause the UserName property to become the primary key in the database. ![]() Your classes Level1 Entity public class Level1 (length= 5,name= "LEVEL1_ID" (name= "my_seq_gen", // 1 ![]() In this example which have been coded to avoid some existing Lot cleaner than some of the non-standard structures we have Generally, is easier to read, and certainly a If support forĬomposite keys is improved in future releases, it may become viable to
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