Package oracle.jbo.pcoll

Contains a facility to store collections of temporary data.

See: Description

Interface Summary

Interface	Description
PCollListener
PCollManagerHelper
PCollPersistable
PersistManager

Class Summary

Class	Description
ControlTableSqlStrings
JDBCPersistManager
JTAPersistManager
OraclePersistManager
PCollection
PCollInputStream
PCollKeyInfo
PCollManager
PCollNode
PCollOutputStream
PersistentMarker
TransactionTableSqlStrings

Package oracle.jbo.pcoll Description

Contains a facility to store collections of temporary data. Alongside its core object/relational persistence feature for entity objects, BC4J has a facility to store collections of temporary data. This persistent collections facility (PCOLL) is used by the BC4J framework to temporarily store :

• Pending changes in application modules.

  This allows the pending changes in an application module to be logically retained without physically dedicating an application module instance to each client.

• Overflow query result rows when a users scrolls through very large result sets.

  This insures that the application does not run out of memory when an a misguided user query returns too many rows and they decide to scroll through them all. Instead the extra rows "spill-over" into a temporary persistent store without using real-memory.

In order to manage this pending state, BC4J creates a set of tables that hold the temporary information in BLOB values.