Specifies the SQL DELETE statement to use when applying a cached deletion of a record.
Syntax:
property DeleteSQL: TStrings;
Description:
Set DeleteSQL to the SQL DELETE statement to use when applying a deletion to a record. Statements can be parameterized queries. To create a DELETE statement at design time, use the UpdateSQL editor to create statements, such as:
DELETE FROM "Country" WHERE Name = :OLD_Name
At run time, an application can write a statement directly to this property to set or change the DELETE statement.
As the example illustrates, DeleteSQL supports an extension to normal parameter binding. To retrieve the value of a field as it exists prior to application of cached updates, the field name with 'OLD_'. This is especially useful when doing field comparisons in the WHERE clause of the statement.