Constraint.ConstraintType (Flink : 2.0-SNAPSHOT API)

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 Description

PRIMARY_KEY

UNIQUE_KEY

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	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