The JdbF project - architecture

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architecture

Jdbf's structure is logically composed from two macrosystems. These macrosystem are:

MMS (Mapping Management System)
SMS (Sql Management System)

Mapping Management System

Mapping Management System manages mapping between Java objects and database. This mapping is represented by repository file where a table is mapped with Java object in XML format. An example of repository is shown below

	    <repositoryView name="product" table-name="Product" object-name="Product" database-name="jdbf">
	      <item property-name="OID" primary-key="yes" data-type="int" column-name="id" />
	      <item property-name="name" primary-key="no" data-type="string" column-name="name" />
	      <item property-name="price" primary-key="no" data-type="int" column-name="price" />          
	      <item property-name="groupId" primary-key="no" data-type="int" column-name="group_id" />          
	      ....
	    </repositoryView>

Mapping is very simple.Mapping between column table and property of Java object is specified with tag <item/> where is specified the name of property, the name of column and other information. From this file Jdbf will create in automatically and trasparently way the sql statement, using other important macrosystem: SMS.

Sql Management System

Sql Management System is more modular system that MMS. In fact it is composed from other modules which are delegated to manage the operation that occur between creation of sql statement ant its execution.
These mnodules are:

Data Caching System (DCS) module that manages data cache
Transaction System (TS) module that manages the transation against database
Key Generation System (KGS) module that manages the generation of unique id (OID) for object
Query Builder System (QBS) module that manages the creation of sql statement
Database Connection System (DCoS) module that manages the creation and usage of database connection