Top "Constraints" questions

A constraint is a condition that has to be fulfilled in a given context.

SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '1922-1' for key 'IDX_STOCK_PRODUCT'

While creating product, at the last step after retrieving for a time, Magento gives following error-: SQLSTATE[23000]: Integrity constraint violation: 1062 …

magento constraints mysql-error-1062 duplicates
How to add "on delete cascade" constraints?

In PostgreSQL 8 is it possible to add ON DELETE CASCADES to the both foreign keys in the following table without …

postgresql constraints cascade cascading-deletes postgresql-8.4
How can I use interface as a C# generic type constraint?

Is there a way to get the following function declaration? public bool Foo<T>() where T : interface; ie. …

c# generics interface constraints
trying to animate a constraint in swift

I have a UITextField that I want to enlarge its width when tapped on. I set up the constraints and …

xcode swift constraints xcode6
Is there a constraint that restricts my generic method to numeric types?

Can anyone tell me if there is a way with generics to limit a generic type argument T to only: …

c# generics constraints
Annotations from javax.validation.constraints not working

What configuration is needed to use annotations from javax.validation.constraints like @Size, @NotNull, etc.? Here's my code: import javax.…

java spring annotations constraints bean-validation
How to trap on UIViewAlertForUnsatisfiableConstraints?

I'm seeing an error appear in my debugger log: Will attempt to recover by breaking constraint <NSLayoutConstraint:0x191f0920 …

ios autolayout uikit constraints xcode7
Remove all constraints affecting a UIView

I have a UIView which is placed on the screen via several constraints. Some of the constraints are owned by …

ios objective-c uiview constraints autolayout
How to create a unique index on a NULL column?

I am using SQL Server 2005. I want to constrain the values in a column to be unique, while allowing NULLS. …

sql sql-server indexing constraints unique
Temporarily disable all foreign key constraints

I am running an SSIS package which will replace data for a few tables from FlatFiles to existing tables in …

sql-server sql-server-2008 ssis constraints