PrimaryKey class

Primary key annotation for composite primary keys (multiple columns).

Use this annotation on the entity class to define a composite primary key when you need multiple columns to form the primary key. The columns must exist as fields in the entity.

For single-field primary keys, use @Id on the field instead.

Note: You cannot use both @Id and @PrimaryKey in the same entity. A build error will be thrown if both are used together.

Example:

@Entity(tableName: 'order_items')
@PrimaryKey(columns: ['order_id', 'product_id'])
class OrderItemEntity {
  int orderId;
  int productId;
  int quantity;
}