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Apache Derby 10.8 | |||||||||
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java.lang.Object org.apache.derby.vti.Restriction
public abstract class Restriction
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.
Nested Class Summary | |
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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 | |
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Restriction()
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Method Summary | |
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protected java.lang.String |
parenthesize(java.lang.String raw)
Utility method to parenthesize an expression |
abstract java.lang.String |
toSQL()
Turn this Restriction into a string suitable for use in a WHERE clause. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public Restriction()
Method Detail |
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public abstract java.lang.String toSQL()
protected java.lang.String parenthesize(java.lang.String raw)
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Built on Fri 2012-11-02 12:25:54-0700, from revision 1405108 | |||||||||
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