Examples of com.sleepycat.db.SecondaryMultiKeyCreator

• com.sleepycat.db.SecondaryMultiKeyCreator
  O HERE: Extract the secondary keys from the primary key and // data. For each key extracted, create a DatabaseEntry and add it // to the results set. // } } ... SecondaryConfig secConfig = new SecondaryConfig(); secConfig.setMultiKeyCreator(new MyMultiKeyCreator()); // Now pass secConfig to Environment.openSecondaryDatabase

  Use this interface when any number of secondary keys may be present in a single primary record, in other words, for many-to-many and one-to-many relationships. When only zero or one secondary key is present (for many-to-one and one-to-one relationships) you may use the {@link SecondaryKeyCreator} interface instead.The table below summarizes how to create all four variations of relationships.

  Relationship	Interface	Duplicates	Example
  One-to-one	{@link SecondaryKeyCreator}	No	A person record with a unique social security number key.
  Many-to-one	{@link SecondaryKeyCreator}	Yes	A person record with a non-unique employer key.
  One-to-many	{@link SecondaryMultiKeyCreator}	No	A person record with multiple unique email address keys.
  Many-to-many	{@link SecondaryMultiKeyCreator}	Yes	A person record with multiple non-unique organization keys.

  To configure a database for duplicates. pass true to {@link DatabaseConfig#setSortedDuplicates}.

  Note that SecondaryMultiKeyCreator may also be used for single key secondaries (many-to-one and one-to-one); in this case, at most a single key is added to the results set. SecondaryMultiKeyCreator is only slightly less efficient than {@link SecondaryKeyCreator} in that two or threetemporary sets must be created to hold the results. @see SecondaryConfig

Related Classes of com.sleepycat.db.SecondaryMultiKeyCreator