primary-key

I am trying to make an Entity using a date as a primary key. The problem is that Symfony can't convert the DateTime I'm using into a string to introduce it in the IdentityMap. I get the following error during the persist of the entity: Catchable Fatal Error: Object of class DateTime could not be converted to string in.. I'm using this code in the entity : /** * @ORM\Id * @ORM\Column(type="datetime") */ protected $date; The error appears in the entity repository : $em = $this->getEntityManager(); $currentData = new CurrentData(); ... $currentData->setDate(new \DateTime($dateStr)); ... $em-

Yes i am very well aware the consequences. But i just want to reorder them. Start from 1 to end. How do I go about reordering the keys using a single query ? It is clustered primary key index Reordering like First record Id 1 second record Id 2 The primary key is Int gopinath s Drop PK constraint Drop Identity column Re-create Identity Column Re-Create PK USE Test go if(object_id('IdentityTest') Is not null) drop table IdentityTest create table IdentityTest ( Id int identity not null, Name varchar(5), constraint pk primary key (Id) ) set identity_insert dbo.IdentityTest ON insert into dbo

I am just getting started with Entity Framework 4.1, trying out the "database first" mode. When EF generates a Model class with the "ADO.Net DbContext Generator," shouldn't it identify the primary key for the class with a [Key] attribute? Without this, it appears incompatible with the T4 MVCScaffolding. Here are the details: Using the Entity Data Model Designer GUI, I have added a simple "country" table to the model from my existing database. The GUI correctly identifies a single integer identity key field named "PK" as my primary key. (Alas! I'm a new user so I can't add a screenshot. I've

In a RoR migration, how do I auto increment a non-primary-key field? I'd like to do this in the db definition, and not in the model. user386660 You need to execute an SQL statement. statement = "ALTER TABLE `users` CHANGE `id` `id` SMALLINT( 5 ) UNSIGNED NOT NULL AUTO_INCREMENT" ActiveRecord::Base.connection.execute(statement) you can entry manually in your migration Note this is just an example. The final SQL statement syntax depends on the database. 来源： https://stackoverflow.com/questions/3220473/auto-increment-a-non-primary-key-field-in-ruby-on-rails

How would I reset the primary key counter on a sql table and update each row with a new primary key? I would add another column to the table first, populate that with the new PK. Then I'd use update statements to update the new fk fields in all related tables. Then you can drop the old PK and old fk fields. EDIT: Yes, as Ian says you will have to drop and then recreate all foreign key constraints. Zachary Yates Not sure which DBMS you're using but if it happens to be SQL Server: SET IDENTITY_INSERT [MyTable] ON allows you to update/insert the primary key column. Then when you are done updating

Is it possible for Entity Framework 4.0 to have an association/navigation property based off of a foreign key to a non-primary key field (it has a unique constraint). No because EF don't understand unique constraint yet and relations in EF must follow same rules as relations in database. Without unique principal relation cannot exist and the only way to get unique principal in EF is using primary key. 来源： https://stackoverflow.com/questions/9217448/entity-framework-foreign-keys-to-non-primary-key-fields