org.apache.derby.vti

## Class Restriction

- java.lang.Object
- - org.apache.derby.vti.Restriction

- All Implemented Interfaces:
    Serializable
  Direct Known Subclasses:
    Restriction.AND, Restriction.ColumnQualifier, Restriction.OR

      public abstract class Restriction
      extends Object
      implements Serializable

  An expression to be pushed into a Table Function so that the Table Function can short-circuit its processing and return fewer rows. A restriction is represented as a binary tree. The non-leaf nodes are ANDs and ORs. The leaf nodes are ColumnQualifiers. A ColumnQualifier is a simple expression comparing a constant value to a column in the Table Function.

  See Also:
    Serialized Form

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `Restriction.AND` An AND of two Restrictions
    `static class` | `Restriction.ColumnQualifier` A simple comparison of a column to a constant value.
    `static class` | `Restriction.OR` An OR of two Restrictions

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Restriction()`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `abstract String` | `toSQL()` Turn this Restriction into a string suitable for use in a WHERE clause.

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### Restriction

          public Restriction()

  - ### Method Detail

    - #### toSQL

          public abstract String toSQL()

      Turn this Restriction into a string suitable for use in a WHERE clause.

Apache Derby 10.13 API Documentation - Copyright © 2004,2016 The Apache Software Foundation. All Rights Reserved.