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java.lang.Objectorg.jpox.metadata.VersionStrategy
Three common strategies for versioning instances are supported by standard metadata. These include state-comparison, timestamp, and version-number. state-image involves comparing the values in specific columns to determine if the database row was changed. 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.
Field Summary | |
static VersionStrategy |
DATE_TIME
strategy="date-time" |
static VersionStrategy |
STATE_IMAGE
strategy="state-image" |
static VersionStrategy |
VERSION_NUMBER
strategy="version-number" |
Method Summary | |
boolean |
equals(java.lang.Object o)
Indicates whether some other object is "equal to" this one. |
protected int |
getType()
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static VersionStrategy |
getVersionStrategy(java.lang.String value)
Return VersionStrategy from String. |
java.lang.String |
toString()
Returns a string representation of the object. |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
public static final VersionStrategy STATE_IMAGE
public static final VersionStrategy DATE_TIME
public static final VersionStrategy VERSION_NUMBER
Method Detail |
public boolean equals(java.lang.Object o)
o
- the reference object with which to compare.
public java.lang.String toString()
protected int getType()
public static VersionStrategy getVersionStrategy(java.lang.String value)
value
- strategy attribute value
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