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Event Catalyst
C++Builder Database Architecture
AfterDelete Occurs following a Delete.
AfterEdit Occurs following an Edit.
AfterInsert Occurs following an Insert or Append.
AfterOpen Occurs after a TDataset is opened
AfterPost Occurs following a Post.
BeforeCancel Occurs prior to a Cancel.
BeforeClose Occurs before the close of the TDataset.
BeforeDelete Occurs prior to a Delete.
BeforeEdit Occurs prior to an Edit.
BeforeInsert Occurs prior to an Insert or Append.
BeforeOpen Occurs before a TDataset is opened.
BeforePost Occurs prior to a Post.
OnCalcFields Occurs when calculated fields need values.
OnDeleteError Occurs when there is a problem deleting a record.
OnEditError Occurs when there is a problem editing a record.
OnFilterRecord Occurs when filtering is active and the TDataset needs a row.
OnNewRecord Occurs when a new record is added to the TDataset.
OnPostError Occurs when there is a problem posting a record.
OnUpdateError Occurs when there is a problem while applying cached updates.
OnUpdateRecord Occurs for each row saved by a call to ApplyUpdates.
Key Elements
You use the DatabaseName property to specify the database you want to access. It points either
to a local application-specific alias or to one that you’ve defined using the Database Explorer
or the BDE Configuration utility.
The TableName property points to the physical database table. On some platforms it may also
include the name of the table’s home database and/or that of the table’s owner or schema.
Set the IndexName or IndexFields property to make use of a secondary index with the table.
To establish a master/detail relationship with another table, set the MasterSource property
to reference a TDataset that shares a common key with this one. Once MasterSource is set,
specify the key fields in the master DataSource using the MasterFields property. These keys
must correspond with those of the current index, as specified by IndexName or IndexFields.
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