Package org.apache.flink.table.legacy.api.constraints

Interface Constraint

All Known Implementing Classes:
UniqueConstraint
@Deprecated @Internal public interface Constraint
Deprecated.
See ResolvedSchema and Constraint.
Integrity constraints, generally referred to simply as constraints, define the valid states of SQL-data by constraining the values in the base tables.

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Interface
    Description
    static enum 
    Constraint.ConstraintType
    Deprecated.
    Type of the constraint.

  • Method Summary

    Modifier and Type
    Method
    Description
    String
    asSummaryString()
    Deprecated.
    Prints the constraint in a readable way.
    String
    getName()
    Deprecated.
     
    Constraint.ConstraintType
    getType()
    Deprecated.
    Tells what kind of constraint it is, e.g.
    boolean
    isEnforced()
    Deprecated.
    Constraints can either be enforced or non-enforced.

  • Method Details

    • getName

      String getName()
      Deprecated.

    • isEnforced

      boolean isEnforced()
      Deprecated.
      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()
      Deprecated.
      Tells what kind of constraint it is, e.g. PRIMARY KEY, UNIQUE, ...

    • asSummaryString

      String asSummaryString()
      Deprecated.
      Prints the constraint in a readable way.