constraints

I am using storyboard in an iOS/xcode project with the following simplified "hierarchy" (from top to bottom): ViewController (not a TableViewController for some customizing reasons) View TableView (and some other content that does not matter I think) Cell ContentView "AnyView" (specific type seems to be irrelevant, as the following happens for every item I tried) When I set the constraints between AnyView and ContentView to Zero Spacing for Top/Bottom/Leading/Trailing there is still quite some "space" between the ContentView and AnyView. (I have never encountered this when doing similar things

Is it possible in PostgreSQL to create a deferrable unique constraint on a character column, but case-insensitive? Let's assume the following basic table: CREATE TABLE sample_table ( my_column VARCHAR(100) ); If deferrable constraint is not needed, it is as simple as creating unique index with function, e.g.: CREATE UNIQUE INDEX my_unique_index ON sample_table(UPPER(my_column)); Deferred constraint check requires creating the constraint explicitly, e.g.: ALTER TABLE sample_table ADD CONSTRAINT my_unique_constraint UNIQUE(my_column) DEFERRABLE INITIALLY IMMEDIATE; And unfortunately it is not

Let's say I have following XML file: <authors> <author>a1</author> <author>a2</author> <lastmodified>2010</lastmodified> </authors> and an XML schema fragment: <xs:element name="authors" maxOccurs="1"> <xs:complexType> <xs:sequence> <xs:element name="author" maxOccurs="unbounded" type="xs:string"> </xs:element> <xs:element name="lastmodified" type="xs:date" minOccurs="0"/> </xs:sequence> </xs:complexType> <xs:unique name="uniqueAuthor"> <xs:selector xpath="."/> <xs:field xpath="author"/> </xs:unique> </xs:element> What I want is to make a constraint that will not allow two identical author

I was wondering if it is possible to add multiple generic constraints? I have an Add method that takes an Object (Either Email, Phone or Address), so i was thinking something like: public void Add<T>(T Obj) where T : Address where T : Email where T : Phone { if (Obj is Address) m_Address.Add(Obj as Address); else if (Obj is Email) m_Email.Add(Obj as Email); else m_Phone.Add(Obj as Phone); } But I keep getting: "A constraint clause has already been specified for type parameter 'T'. All of the constraints for a type parameter must be specified in a single where clause." You can't do that. Why

Working on some legacy hibernate code. How do I do the following with hbm.xml(hibernate mapping file) instead of with annotations? @Table(name="users", uniqueConstraints = { @UniqueConstraint(columnNames={"username", "client"}), @UniqueConstraint(columnNames={"email", "client"}) }) public class User implements Serializable { private static final long serialVersionUID = 1L; @Id private int id; private String username; private String email; private Client client; } Use the properties tag: ... <properties name="uk1" unique="true"> <property name="username" .../> <many-to-one name="client" .../> <

I have a Table with 4 Columns Each Column will be A,B,C,D Column A is the Primary key. Column B has unique name constraint. Now I want to remove the unique constraint for column B and give a unique constraint by combining the columns B, C and D. So the table will allow only one row with a particular value in columns B,C and D. How can I give this type of a constraint? I tried giving the composite unique key like : ALTER TABLE TABLENAME ADD CONSTRAINT CONSTRAINT_NAME UNIQUE (COLUMN_B, COLUMN_C, COLUMN_D) But it is checking whether any one of the constraint is present rather than checking for

This is a follow-on question from the one I asked here . Can constraints in a DB have the same name? Say I have: CREATE TABLE Employer ( EmployerCode VARCHAR(20) PRIMARY KEY, Address VARCHAR(100) NULL ) CREATE TABLE Employee ( EmployeeID INT PRIMARY KEY, EmployerCode VARCHAR(20) NOT NULL, CONSTRAINT employer_code_fk FOREIGN KEY (EmployerCode) REFERENCES Employer ) CREATE TABLE BankAccount ( BankAccountID INT PRIMARY KEY, EmployerCode VARCHAR(20) NOT NULL, Amount MONEY NOT NULL, CONSTRAINT employer_code_fk FOREIGN KEY (EmployerCode) REFERENCES Employer ) Is this allowable? Does it depend on the