![]() ![]() Upon submission of the form for update, an additional set of checksums is computed on the then current data stored in the database. ![]() This checksum is stored in an extra hidden tabular form column. Using a method called optimistic locking, a checksum is computed for each row when rendering a tabular form. Wizard generated tabular forms built-in DML, include a checksum column to prevent lost updates. Users can check one or more rows on the current page and when they press the Delete button, the row numbers are used to identify the corresponding primary key value(s) and the matching rows are deleted. Delete operations are performed by referencing row number of the row to be deleted. For new records, the primary key values must be NULL in order to be identified as new records. ![]() The primary key columns must be part of the tabular form SQL query, and the report columns must be either hidden or display-only (save state) in order for the DML processes to be able to identify the correct records. MRU and MRD processes reference the underlying table name and the primary key columns. Multi Row Delete (MRD) process deletes requests on one or more rows When a tabular form page is submitted, the tabular form data is processed using built-in data manipulation language (DML), or a custom PL/SQL page processes.Ī tabular form with automatic DML has two processes for multi-row operations:Ī Multi Row Update (MRU) process performs create and update operations Unlike a single record from, tabular forms do not store data in session state. Tabular forms are based on a SQL query in which the query columns are tied to the underlying table columns. ![]()
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