Package org.datanucleus.metadata
Enum VersionStrategy
- All Implemented Interfaces:
Serializable
,Comparable<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.
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Enum Constant Summary
Enum Constants -
Field Summary
Fields -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic VersionStrategy
getVersionStrategy
(String value) Return VersionStrategy from String.toString()
static VersionStrategy
Returns the enum constant of this type with the specified name.static VersionStrategy[]
values()
Returns an array containing the constants of this enum type, in the order they are declared.
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Enum Constant Details
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NONE
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VERSION_NUMBER
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DATE_TIME
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STATE_IMAGE
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Field Details
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name
String name
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Constructor Details
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VersionStrategy
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Method Details
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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
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valueOf
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 nameNullPointerException
- if the argument is null
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toString
- Overrides:
toString
in classEnum<VersionStrategy>
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getVersionStrategy
Return VersionStrategy from String.- Parameters:
value
- strategy attribute value- Returns:
- Instance of VersionStrategy. If value invalid, return null.
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