org.mmbase.storage.search.implementation.database

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Java Source Code / Java Documentation » Database ORM » MMBase » org.mmbase.storage.search.implementation.database 
org.mmbase.storage.search.implementation.database
Java Source File NameTypeComment
BasicQueryHandler.javaClass Basic implementation using a database.
BasicSqlHandler.javaClass Basic implementation.
ChainedSqlHandler.javaClass Baseclass for chained sql handlers, these are org.mmbase.storage.search.implementation.database.SqlHandler SqlHandler implementations that wrap SqlHandler objects to create a chain of handlers, following the Chain Of Responsibility design pattern.

This class is provided as a baseclass to for chained handlers. It implements all SqlHandler methods by delegating to its successor, i.e.

HSqlSqlHandler.javaClass The HSQL query handler, implements org.mmbase.storage.search.implementation.database.SqlHandler SqlHandler for standard hsql functionality.
InformixSqlHandler.javaClass The Informix query handler, implements org.mmbase.storage.search.implementation.database.SqlHandler SqlHandler for standard Informix functionality.
MSSqlSqlHandler.javaClass
MySqlSqlHandler.javaClass The MySQL query handler, implements org.mmbase.storage.search.implementation.database.SqlHandler SqlHandler for standard MySQL functionality.
PostgreSqlSqlHandler.javaClass The PostgreSQL query handler, implements org.mmbase.storage.search.implementation.database.SqlHandler SqlHandler for standard PostgreSql functionality.
SqlHandler.javaInterface Interface for handler classes that are used to create SQL string representations of SearchQuery SearchQuery objects.

A number of SqlHandler objects can create a chain of handlers, following the Chain Of Responsibility design pattern.

In short:

  • A chain is formed of SqlHandler objects, where each element in the chain, except the last one, is called a chained handler. Each chained handler has a successor, which is the next element in the chain.
  • The first element receives all requests first (a request = call of one of the methods in the interface). When a chained element receives a request, it can either handle it or pass it on to its successor.
  • The last element in the chain, handles all remaining requests.

Each handler in the chain adds functionality to its successor(s), in a way similar to subclassing.

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