Returns an INTEGER value that represents the
current change state of a static ProDataSet temp-table buffer.
Syntax
-
buffer-name
- The name of a ProDataSet temp-table buffer (preferably a before-image
temp-table buffer).
Notes
- The
ROW-STATE function corresponds to the ROW-STATE attribute.
- When the TRACKING-CHANGES attribute is set to TRUE for a ProDataSet temp-table, the
AVM tracks changes to the data in that temp-table using a before-image temp-table
that contains the original version of each modified row. You can
think of the temp-table itself as the after-image because it contains
the latest version of each row.
Every row in the after-image table
that has been modified or created corresponds to a row in the before-image
table. Deleted rows do not appear in the after-image table, because
it reflects the current state of the data. Every row in the before-image
table has a non-zero ROW-STATE, because every row is the before-image
of a deleted, created, or modified row in the after-image table.
Unchanged rows do not appear in the before-image table.
You
can use the ROW-STATE function on each row in either the after-image
table or the before-image table to determine whether a row has changed
and how it has changed.
- The possible return values can be expressed as compiler constants. The following table
lists these values.
Row state values
| Compiler constant |
Value |
Description |
| ROW-UNMODIFIED |
0 |
The row was not modified. |
| ROW-DELETED |
1 |
The row was deleted. |
| ROW-MODIFIED |
2 |
The row was modified. |
| ROW-CREATED |
3 |
The row was created. |
- The ROW-STATE function returns the Unknown value (?) when
the specified temp-table buffer:
- Does not contain a record
- Is an after-image table with no associated before-image table
- You can invoke the ROW-STATE function from within a WHERE clause
(unlike the corresponding attribute). For example:
WHERE ROW-STATE(ttOrder) = ROW-MODIFIED.
|
