org.apache.flink.table.catalog

Enum Constraint.ConstraintType

java.lang.Object

java.lang.Enum<Constraint.ConstraintType>

org.apache.flink.table.catalog.Constraint.ConstraintType

All Implemented Interfaces:

Serializable, Comparable<Constraint.ConstraintType>

Enclosing interface:

Constraint

@PublicEvolving
public static enum Constraint.ConstraintType
extends Enum<Constraint.ConstraintType>

Type of the constraint.

Unique constraints:

• UNIQUE - is satisfied if and only if there do not exist two rows that have same non-null values in the unique columns
• PRIMARY KEY - additionally to UNIQUE constraint, it requires none of the values in specified columns be a null value. Moreover there can be only a single PRIMARY KEY defined for a Table.

Enum Constant Summary

Enum Constants

Enum Constant and Description
PRIMARY_KEY
UNIQUE_KEY

Method Summary

Modifier and Type	Method and Description
static Constraint.ConstraintType	valueOf(String name) Returns the enum constant of this type with the specified name.
static Constraint.ConstraintType[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

PRIMARY_KEY

public static final Constraint.ConstraintType PRIMARY_KEY

UNIQUE_KEY

public static final Constraint.ConstraintType UNIQUE_KEY

Method Detail

values

public static Constraint.ConstraintType[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (Constraint.ConstraintType c : Constraint.ConstraintType.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static Constraint.ConstraintType valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null