TUpdateSQL.ModifySQL Property

Specifies the SQL UPDATE statement to use when applying an update to a record and cached updates is enabled.

Pascal

property ModifySQL: TStrings;

C++

__property TStrings ModifySQL;

Description

Set ModifySQL to the SQL UPDATE statement to use when applying an updated record to a dataset. Statements can be parameterized queries. To create a UPDATE statement at design time, use the UpdateSQL editor to create statements, such as:

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UPDATE "Country.db"
SET Name = :Name, Capital = :Capital, Continent = :Continent
WHERE Name = :OLD_Name

At run time, an application can write a statement directly to this property to set or change the UPDATE statement.

Note: As the example illustrates, ModifySQL 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.