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How does a cursor FOR loop statement end?
When there are no more rows to fetch, the cursor FOR LOOP statement closes the cursor. The cursor also closes if a statement inside the loop transfers control outside the loop or raises an exception.
Can we develop exceptions in cursor environment?
HANDLE EXCEPTIONS INSIDE CURSOR LOOP We have been handling Exception at the End of PL/SQL Block. In this case, we need to create two Exception handling code, first one is to handle the error while processing records through Cursor Loop and the other one is to handle Exceptions outside the Cursor Loop.
What is a drop cursor?
DEALLOCATE removes the association between a cursor and the cursor name or cursor variable. If a name or variable is the last one referencing the cursor, the cursor is deallocated and any resources used by the cursor are freed. Scroll locks used to protect the isolation of fetches are freed at DEALLOCATE .
What is the default cursor?
If the value of the cursor property is set to default, generally the cursor will look like an arrow, which is the default cursor display.
Which isn’t the characteristics of a cursor FOR loop?
9) The command used to open a CURSOR FOR loop is None, cursor for loops handle cursor opening implicitly.
Can we use FOR loop in cursor?
Introduction to PL/SQL cursor FOR LOOP statement A nice feature of the cursor FOR LOOP statement is that it allows you to fetch every row from a cursor without manually managing the execution cycle i.e., OPEN , FETCH , and CLOSE . If there is no row to fetch, the cursor FOR LOOP closes the cursor.
How is the cursor created in the for loop?
The cursor is created for the ‘SELECT’ statement that is given in the cursor declaration. In execution part, the declared cursor is setup in the FOR loop and the loop variable ‘I’ will behave as cursor variable in this case. Example 1: In this example, we will project all the employee name from emp table using a cursor-FOR loop.
Can a cursor be referred to from another place?
These cursors cannot be named and, hence they cannot be controlled or referred from another place of the code. We can refer only to the most recent cursor through the cursor attributes. Programmers are allowed to create named context area to execute their DML operations to get more control over it.
What are the attributes of the cursor attribute?
Cursor Attributes Cursor Attribute Description %FOUND It returns the Boolean result ‘TRUE’ if %NOTFOUND This works oppositely to %FOUND it will %ISOPEN It returns Boolean result ‘TRUE’ if the %ROWCOUNT It returns the numerical value. It gives
How is the cursor created in the SELECT statement?
The cursor is created for the ‘SELECT’ statement that is given in the cursor declaration. In execution part, the declared cursor is opened, fetched and closed.