io.ebean.config.dbplatform

Class SimpleSequenceIdGenerator

java.lang.Object

io.ebean.config.dbplatform.SimpleSequenceIdGenerator

All Implemented Interfaces:

PlatformIdGenerator

public class SimpleSequenceIdGenerator
extends Object
implements PlatformIdGenerator

A very simple Database sequence based IdGenerator.

One which batch requests sequence Id's would be better for performance.

Field Summary

Fields inherited from interface io.ebean.config.dbplatform.PlatformIdGenerator

AUTO_UUID

Constructor Summary

Constructors

Constructor and Description
SimpleSequenceIdGenerator(DataSource dataSource, String sql, String seqName) Construct given a dataSource and sql to return the next sequence value.

Method Summary

Modifier and Type	Method and Description
String	getName() Return the name of the IdGenerator.
boolean	isDbSequence() Return true if this is a DB sequence.
Object	nextId(Transaction t) return the next unique identity value.
void	preAllocateIds(int batchSize) Is called prior to inserting OneToMany's as an indication that a number of beans are likely to need id's shortly.

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleSequenceIdGenerator

public SimpleSequenceIdGenerator(DataSource dataSource,
                                 String sql,
                                 String seqName)

Construct given a dataSource and sql to return the next sequence value.

Method Detail

getName

public String getName()

Description copied from interface: PlatformIdGenerator

Return the name of the IdGenerator. For sequences this is the sequence name.

Specified by:

getName in interface PlatformIdGenerator

isDbSequence

public boolean isDbSequence()

Description copied from interface: PlatformIdGenerator

Return true if this is a DB sequence.

Specified by:

isDbSequence in interface PlatformIdGenerator

preAllocateIds

public void preAllocateIds(int batchSize)

Description copied from interface: PlatformIdGenerator

Is called prior to inserting OneToMany's as an indication that a number of beans are likely to need id's shortly.

Can be used as a performance optimisation to prefetch a number of Id's. Especially when the allocateSize is very large.

Specified by:

preAllocateIds in interface PlatformIdGenerator

nextId

public Object nextId(Transaction t)

Description copied from interface: PlatformIdGenerator

return the next unique identity value.

Note the transaction passed in can be null.

Specified by:

nextId in interface PlatformIdGenerator