Restriction (Apache Derby 10.15 API Documentation)

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	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 Description

Restriction()

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type Method 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.
    
    Returns:
    
    this Restriction as a string suitable for use in a WHERE clause.