Updating a record through cursor
Consider the following table : Here is how you use the Update Cursor.I have highlighted the areas which is differ from compared with a normal cursor.When you use a Transact-SQL server cursor, you can update the current row by using an UPDATE statement that includes a WHERE CURRENT OF clause.Changes made with this clause affect only the row on which the cursor is positioned. Business Entity ID) ; OPEN complex_cursor; FETCH FROM complex_cursor; UPDATE Human Resources.END; / DROP TABLE employees_temp; DROP TABLE employees_temp2; statement to organize rows from a database table into a tree structure.There can be a situation where you have to use a cursor, even though the experts say not to use cursors or to avoid them as much as possible.You can manipulate Oracle data flexibly and safely because PL/SQL fully supports all SQL data manipulation statements (except ), transaction control statements, functions, pseudocolumns, and operators.
In these type of situations it is ideal to use a Update Cursor, than using the default read only one.
It is important not to allow one operation to succeed while the other fails.
At the end of a transaction that makes database changes, Oracle makes all the changes permanent or undoes them all.
To demonstrate how to use a cursor to update records we'll create a running total of the number of Oscars our films have won.
To begin with we'll declare a couple of variables and set their default values.
Search for updating a record through cursor:
The first variable will hold the running total of Oscars while the second will be used to read each individual film's Oscars as the cursor moves through the record set.