Enum VersionStrategy

java.lang.Object
java.lang.Enum<VersionStrategy>
org.datanucleus.metadata.VersionStrategy
All Implemented Interfaces:
Serializable, Comparable<VersionStrategy>

public enum VersionStrategy extends Enum<VersionStrategy>
Three common strategies for versioning instances are supported by standard metadata. These include state-comparison, timestamp, and version-number.
  • date-time involves comparing the value in a date-time column in the table. The first time in a transaction the row is updated, the timestamp value is updated to the current time.
  • version-number involves comparing the value in a numeric column in the table. The first time in a transaction the row is updated, the version-number column value is incremented.
  • state-image involves comparing the values in specific columns to determine if the database row was changed.
  • Enum Constant Details

  • Field Details

  • Constructor Details

    • VersionStrategy

      private VersionStrategy(String name)
  • Method Details

    • values

      public static VersionStrategy[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.
      Returns:
      an array containing the constants of this enum type, in the order they are declared
    • valueOf

      public static VersionStrategy valueOf(String name)
      Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
      Parameters:
      name - the name of the enum constant to be returned.
      Returns:
      the enum constant with the specified name
      Throws:
      IllegalArgumentException - if this enum type has no constant with the specified name
      NullPointerException - if the argument is null
    • toString

      public String toString()
      Overrides:
      toString in class Enum<VersionStrategy>
    • getVersionStrategy

      public static VersionStrategy getVersionStrategy(String value)
      Return VersionStrategy from String.
      Parameters:
      value - strategy attribute value
      Returns:
      Instance of VersionStrategy. If value invalid, return null.