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454 Day 12
Table 12.13. TQuery key methods.
Event Catalyst
AfterCancel Occurs following a Cancel.
AfterClose Occurs following the close of the TDataset.
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
SQL statements that do not return a result set can also be executed. This includes calls to the
SQL INSERT, UPDATE, and DELETE commands, for example. Use the ExecSQL method for these
types of queries.
The DatabaseName property specifies the database you want to query. The SQL property
specifies the single SQL statement that you want to use in the query. When you query local
tables, use Local SQL. When querying server tables, you can use any SQL syntax that your