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java.lang.Objectorg.jpox.metadata.MetaData
org.jpox.metadata.ExtendableMetaData
org.jpox.metadata.VersionMetaData
Three common strategies for versioning instances are supported by standard metadata. These include state-comparison, timestamp, and version-number. State-comparison involves comparing the values in specific columns to determine if the database row was changed. Timestamp 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.
<!ELEMENT version (extension*, column*, index?, extension*)> <!ATTLIST version strategy CDATA #IMPLIED> <!ATTLIST version column CDATA #IMPLIED> <!ATTLIST version indexed (true|false|unique) #IMPLIED>
Field Summary | |
protected ColumnMetaData[] |
columnMetaData
Contains the metadata for column |
protected java.util.List |
columns
Columns ColumnMetaData |
protected IndexedValue |
indexed
Indexed value |
protected IndexMetaData |
indexMetaData
IndexMetaData. |
Fields inherited from class org.jpox.metadata.ExtendableMetaData |
extensions, JPOX_VENDOR_NAME |
Fields inherited from class org.jpox.metadata.MetaData |
LOCALISER, METADATA_CREATED_STATE, METADATA_INITIALISED_STATE, METADATA_POPULATED_STATE, METADATA_USED_STATE, metaDataState, parent |
Constructor Summary | |
VersionMetaData(java.lang.String versionStrategy,
java.lang.String column,
java.lang.String indexed)
Constructor. |
Method Summary | |
void |
addColumn(ColumnMetaData colmd)
Add a new ColumnMetaData element |
ColumnMetaData[] |
getColumnMetaData()
Acessor for the columns |
IndexMetaData |
getIndexMetaData()
Accessor for indexMetaData |
VersionStrategy |
getVersionStrategy()
Accessor for versionStrategy |
void |
initialise()
Initialisation method. |
void |
setIndexMetaData(IndexMetaData indexMetaData)
Mutator for the index MetaData |
java.lang.String |
toString()
Accessor for a string representation of the object. |
java.lang.String |
toString(java.lang.String prefix,
java.lang.String indent)
Returns a string representation of the object using a prefix This can be used as part of a facility to output a MetaData file. |
Methods inherited from class org.jpox.metadata.ExtendableMetaData |
addExtension, addExtension, getExtension, getExtensions, getNoOfExtensions, getValueForExtension, getValuesForExtension, getValuesForExtensionStartingWith, hasExtension, removeExtension |
Methods inherited from class org.jpox.metadata.MetaData |
getParent, isCreated, isInitialised, isPopulated, isUsed, populate, setInitialised, setPopulated, setUsed |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
protected final java.util.List columns
protected IndexMetaData indexMetaData
protected IndexedValue indexed
protected ColumnMetaData[] columnMetaData
Constructor Detail |
public VersionMetaData(java.lang.String versionStrategy, java.lang.String column, java.lang.String indexed)
versionStrategy
- Strategy for versioningcolumn
- Column nameindexed
- The indexed tagMethod Detail |
public void initialise()
initialise
in class MetaData
public final ColumnMetaData[] getColumnMetaData()
public final VersionStrategy getVersionStrategy()
public final IndexMetaData getIndexMetaData()
public void addColumn(ColumnMetaData colmd)
colmd
- The ColumnMetaData to addpublic final void setIndexMetaData(IndexMetaData indexMetaData)
indexMetaData
- The indexMetaData to set.public java.lang.String toString()
toString
in class ExtendableMetaData
public java.lang.String toString(java.lang.String prefix, java.lang.String indent)
toString
in class ExtendableMetaData
prefix
- prefix stringindent
- indent string
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