Package org.eclipse.persistence.history

Class AsOfSCNClause

java.lang.Object

org.eclipse.persistence.history.AsOfClause

org.eclipse.persistence.history.AsOfSCNClause

All Implemented Interfaces:

Serializable

public class AsOfSCNClause
extends AsOfClause

Purpose:Wraps an immutable value for a past time, represented as a database system change number.

This should be specified with an Oracle platform supporting flashback, and the value will be written to the SQL FROM clause:

SELECT ... FROM EMPLOYEE AS OF SCN (value) t0, ...

See Also:

• AsOfClause
• OraclePlatform.getSystemChangeNumberQuery()
• Serialized Form

Author:

Stephen McRitchie

Field Summary

Fields inherited from class org.eclipse.persistence.history.AsOfClause

NO_CLAUSE

Constructor Summary

Constructors

Constructor	Description
AsOfSCNClause(long systemChangeNumber)
AsOfSCNClause(Long systemChangeNumber)
AsOfSCNClause(Number systemChangeNumber)
AsOfSCNClause(Expression expression)

Method Summary

Modifier and Type	Method	Description
boolean	isAsOfSCNClause()	PUBLIC:
void	printSQL(org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer)	INTERNAL: Prints the as of clause for an expression inside of the FROM clause.

Methods inherited from class org.eclipse.persistence.history.AsOfClause

equals, getValue, isUniversal, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

AsOfSCNClause

public AsOfSCNClause(Number systemChangeNumber)

AsOfSCNClause

public AsOfSCNClause(Long systemChangeNumber)

AsOfSCNClause

public AsOfSCNClause(long systemChangeNumber)

AsOfSCNClause

public AsOfSCNClause(Expression expression)

Method Details

printSQL

public void printSQL(org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter printer)

INTERNAL: Prints the as of clause for an expression inside of the FROM clause.

Overrides:

printSQL in class AsOfClause

isAsOfSCNClause

public boolean isAsOfSCNClause()

PUBLIC:

Overrides:

isAsOfSCNClause in class AsOfClause

See Also:

• AsOfSCNClause