Module io.ebean.api

Class SimpleSequenceIdGenerator

All Implemented Interfaces:

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.

  • Constructor Details

    • SimpleSequenceIdGenerator

      public SimpleSequenceIdGenerator(DataSource dataSource, String sql, String seqName)
      Construct given a dataSource and sql to return the next sequence value.
  • Method Details

    • 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