Class ConditionalUpdateAction

java.lang.Object

com.kingsrook.qqq.backend.core.actions.tables.ConditionalUpdateAction

public class ConditionalUpdateAction
extends Object

Runs an atomic conditional (compare-and-set) update against a table's backend. See ConditionalUpdateInterface. Throws if the backend lacks the capability.

Constructor Summary

Constructors

Constructor	Description
ConditionalUpdateAction()

Method Summary

Modifier and Type	Method	Description
Instant	databaseNow(String tableName)	The backend clock for the backend that holds a table.
int	execute(ConditionalUpdateInput input)	Run the update; return the number of rows updated.
static boolean	isSupported(QBackendMetaData backend)	Whether the backend that holds a table supports conditional updates.

Methods inherited from class java.lang.Object

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

Constructor Details

ConditionalUpdateAction

public ConditionalUpdateAction()

Method Details

execute

public int execute(ConditionalUpdateInput input)
            throws QException

Run the update; return the number of rows updated.

Throws:

QException

databaseNow

public Instant databaseNow(String tableName)
                    throws QException

The backend clock for the backend that holds a table.

Throws:

QException

isSupported

public static boolean isSupported(QBackendMetaData backend)

Whether the backend that holds a table supports conditional updates.