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C++Builder Database Architecture
The Delete method deletes the row at the current cursor position. The Edit method allows
you to modify rows in the TDataset, placing the TDataset in dsEdit mode. The Post method
saves these changes to the database, whereas Cancel discards them.
See the previous discussion on the Table component for information on other TDatasetbased
properties, methods, and events.
TStoredProc
Module: DBTables Class ancestor: TDBDataSet
Like TTable and TQuery, TStoredProc is a direct descendant of the DBDataSet class and an
indirect descendant of the TDataset class. This means that, in addition to the methods,
properties, and events defined by the class itself, TStoredProc inherits several class elements
from the DBDataSet class. This establishes a lot of common ground between the three
TDataset-based components, TTable, TQuery, and TStoredProc.
You use the TStoredProc component to execute stored procedures from within your
C++Builder applications. A stored procedure is a compiled set of SQL statements executed
as a single program. TStoredProc enables you to interact with the result sets returned by these
stored procedures.
Table 12.14 lists the key properties, Table 12.15 lists the key methods, and Table 12.16 lists
the key events for the TStoredProc component.
Table 12.14. TStoredProc key properties.
Property Description
Active Toggles whether the TDataset is open.
AutoCalcFields Determines how calculated fields are calculated.
Bof Reflects whether the TDataset is at its beginning.
CachedUpdates Toggles whether updates are cached.
Database Identifies the TDatabase in use by the TDataset.
DatabaseName Names the alias used to connect to the database.
Eof Reflects whether the TDataset is at its end.
FieldCount Returns the number of fields in the TDataset.
FieldDefs Lists important information about fields in the TDataset.
Fields Returns a specific field from the TDataset. (Requires an index
parameter to be passed in.)
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