After
installing DObject, a DObject page with 11 components will be added to
DObject's components are divided into three species:
|
Component name |
Description |
|
ObjectManager
species: offers database operation, object management, session
management and transaction management. |
|
|
TObjectManager |
The main user interface in DObject |
|
DataProvider
species: the linker between ObjectManager and
ConnectionProvider, with which ObjectManager can control different database
exactly. |
|
|
TDataProvider |
Offers general database accessing and
mostly database supporting SQL-92 can use it. |
|
TAccessDataProvider |
Offers accessing to Microsoft Access
database. |
|
TOracleDataProvider |
Offers accessing to Oracle database. |
|
TSqlServerDataProvider |
Offers accessing to Microsoft SQL Server
database. |
|
TLocalCache |
Offers high-speed caching management of
single session, LocalCache must point to another DataProvider |
TXmlProvider |
Offers accessing to XObject XML database,
need no ConnectionProvider |
|
ConnectionProvider
species: offers connect channel for DataProvider to database. |
|
TAdoConnectionProvider |
Connecting to database via |
TBdeConnectionProvider |
Connecting to database via BDE |
TDbExpressConnectionProvider |
Connecting to database via DbExpress |
TInterbaseConnectionProvider |
Connecting to database via Interbase |
Commonly, when
DObject is used, the three components above need to be used at the same time:
an ObjectManager points to a DataProvider which then points to a
ConnectionProvider, and then the ConnectionProvider points to a suitable
database connection. The following is a typical application of connecting to
SQL Server database via
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