org.apache.flink.table.api.constraints

类 UniqueConstraint

java.lang.Object

org.apache.flink.table.api.constraints.UniqueConstraint

所有已实现的接口:

Constraint

已过时。

See ResolvedSchema and UniqueConstraint.

@Deprecated
 @PublicEvolving
public final class UniqueConstraint
extends Object

A unique key constraint. It can be declared also as a PRIMARY KEY.

另请参阅:

ConstraintType

嵌套类概要

从接口继承的嵌套类/接口 org.apache.flink.table.api.constraints.Constraint

Constraint.ConstraintType

方法概要

限定符和类型	方法和说明
String	asSummaryString() 已过时。 Returns constraint's summary.
boolean	equals(Object o) 已过时。
List<String>	getColumns() 已过时。 List of column names for which the primary key was defined.
String	getName()
Constraint.ConstraintType	getType() 已过时。 Tells what kind of constraint it is, e.g.
int	hashCode() 已过时。
boolean	isEnforced() Constraints can either be enforced or non-enforced.
static UniqueConstraint	primaryKey(String name, List<String> columns) 已过时。 Creates a non enforced ConstraintType#PRIMARY_KEY constraint.
String	toString()

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

方法详细资料

primaryKey

public static UniqueConstraint primaryKey(String name,
                                          List<String> columns)

已过时。

Creates a non enforced ConstraintType#PRIMARY_KEY constraint.

getColumns

public List<String> getColumns()

已过时。

List of column names for which the primary key was defined.

getType

public Constraint.ConstraintType getType()

已过时。

从接口复制的说明: Constraint

Tells what kind of constraint it is, e.g. PRIMARY KEY, UNIQUE, ...

asSummaryString

public final String asSummaryString()

已过时。

Returns constraint's summary. All constraints summary will be formatted as

 CONSTRAINT [constraint-name] [constraint-type] ([constraint-definition])

 E.g CONSTRAINT pk PRIMARY KEY (f0, f1)
 

equals

public boolean equals(Object o)

已过时。

hashCode

public int hashCode()

已过时。

getName

public String getName()

指定者:

getName 在接口中 Constraint

isEnforced

public boolean isEnforced()

从接口复制的说明: Constraint

Constraints can either be enforced or non-enforced. If a constraint is enforced it will be checked whenever any SQL statement is executed that results in data or schema changes. If the constraint is not enforced the owner of the data is responsible for ensuring data integrity. Flink will rely the information is valid and might use it for query optimisations.

指定者:

isEnforced 在接口中 Constraint

toString

public String toString()

覆盖:

toString 在类中 Object