constraints

I have an UITextField that I want to enlarge it's width when tapped on. I set up the constraints and made sure the constraint on the left has the lower priority then the one that I am trying to animate on the right side. Here is the code that I am trying to use. // move the input box UIView.animateWithDuration(10.5, animations: { self.nameInputConstraint.constant = 8 }, completion: { (value: Bool) in println(">>> move const") }) This works, but it seems to just happen instantly and there doesn't seem to be any movement. I tried to set it 10 seconds to make sure I wasn't missing anything, but I

I would like to add a constraint that will check values from related table. I have 3 tables: CREATE TABLE somethink_usr_rel ( user_id BIGINT NOT NULL, stomethink_id BIGINT NOT NULL ); CREATE TABLE usr ( id BIGINT NOT NULL, role_id BIGINT NOT NULL ); CREATE TABLE role ( id BIGINT NOT NULL, type BIGINT NOT NULL ); (If you want me to put constraint with FK let me know.) I want to add a constraint to somethink_usr_rel that checks type in role ("two tables away"), e.g.: ALTER TABLE somethink_usr_rel ADD CONSTRAINT CH_sm_usr_type_check CHECK (usr.role.type = 'SOME_ENUM'); I tried to do this with

I want to make a generic class that accepts only serializable classes, can it be done with the where constraint? The concept I'm looking for is this: public class MyClass<T> where T : //[is serializable/has the serializable attribute] Nope, I'm afraid not. The only things you can do with constraints are: where T : class - T must be a reference type where T : struct - T must be a non-nullable value type where T : SomeClass - T must be SomeClass or derive from it where T : ISomeInterface - T must be ISomeInterface or implement it where T : new() - T must have a public parameterless constructor

How can I use a composite primary key as a foreign key? It looks like my attempt does not work. create table student ( student_id varchar (25) not null , student_name varchar (50) not null , student_pone int , student_CNIC varchar (50), students_Email varchar (50), srudents_address varchar(250), dept_id varchar(6), batch_id varchar(4), FOREIGN KEY (dept_id) REFERENCES department(dept_id), FOREIGN KEY (batch_id) REFERENCES batch(batch_id), CONSTRAINT pk_studentID PRIMARY KEY (batch_id,dept_id,student_id) ) create table files ( files_name varchar(50) not null , files_path varchar(50), files_data

Do any versions of SQL Server support deferrable constraints (DC)? Since about version 8.0, Oracle has supported deferrable constraints - constraints that are only evaluated when you commit a statement group, not when you insert or update individual tables. Deferrable constraints differ from just disabling/enabling constraints, in that the constraints are still active - they are just evaluated later (when the batch is committed). The benefit of DC is that they allow updates that individually would be illegal to be evaluated that cummulatively result in a valid end state. An example is creating