org.apache.flink.table.api.constraints

接口 Constraint

所有已知实现类:

UniqueConstraint

已过时。

See ResolvedSchema and Constraint.

@Deprecated
 @PublicEvolving
public interface Constraint

Integrity constraints, generally referred to simply as constraints, define the valid states of SQL-data by constraining the values in the base tables.

嵌套类概要

嵌套类

限定符和类型	接口和说明
static class	Constraint.ConstraintType 已过时。 Type of the constraint.

方法概要

限定符和类型	方法和说明
String	asSummaryString() 已过时。 Prints the constraint in a readable way.
String	getName() 已过时。
Constraint.ConstraintType	getType() 已过时。 Tells what kind of constraint it is, e.g.
boolean	isEnforced() 已过时。 Constraints can either be enforced or non-enforced.

方法详细资料

getName

String getName()

已过时。

isEnforced

boolean isEnforced()

已过时。

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.

getType

Constraint.ConstraintType getType()

已过时。

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

asSummaryString

String asSummaryString()

已过时。

Prints the constraint in a readable way.