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Berkeley
DB Java Edition version 1.7.1 |
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A marshalling interface implemented by entity classes that
represent keys as tuples. Since MarshalledTupleKeyEntity
objects are instantiated using Java deserialization, no particular
constructor is required by classes that implement this interface.
Note that a marshalled tuple key extractor is somewhat less efficient than a non-marshalled key tuple extractor because more conversions are needed. A marshalled key extractor must convert the entry to an object in order to extract the key fields, while an unmarshalled key extractor does not.
TupleTupleMarshalledBinding
,
TupleSerialMarshalledBinding
Method Summary | |
void |
marshalPrimaryKey(TupleOutput keyOutput)
Extracts the entity's primary key and writes it to the key output. |
boolean |
marshalSecondaryKey(String keyName, TupleOutput keyOutput)
Extracts the entity's secondary key and writes it to the key output. |
boolean |
nullifyForeignKey(String keyName) Clears the entity's secondary key fields for the given key name. |
void |
unmarshalPrimaryKey(TupleInput keyInput)
Completes construction of the entity by setting its primary key from the stored primary key. |
Method Detail |
public void marshalPrimaryKey(TupleOutput keyOutput)
keyOutput
- is the output tuple.
public void unmarshalPrimaryKey(TupleInput keyInput)
keyInput
- is the input tuple.
public boolean marshalSecondaryKey(String keyName, TupleOutput keyOutput)
keyName
- identifies the secondary key.
keyOutput
- is the output tuple.
public boolean nullifyForeignKey(String keyName)
The specified index key should be changed by this method such
that marshalSecondaryKey(java.lang.String,
com.sleepycat.bind.tuple.TupleOutput)
for the same key name will return
false. Other fields in the data object should remain unchanged.
If ForeignKeyDeleteAction.NULLIFY
was specified when opening the secondary database, this method is
called when the entity for this foreign key is deleted. If NULLIFY was
not specified, this method will not be called and may always return
false.
keyName
- identifies the secondary key.
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Berkeley
DB Java Edition version 1.7.1 |
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