As the name suggests Cursor For Loop is a type of For loop provided by oracle PL/SQL which makes working with cursors in oracle database a lot easier by executing OPEN, FETCH & CLOSE Cursor statements implicitly in the background for you.
Cursor for Loop Is an Extension of the Numeric For Loop provided by Oracle PL/SQL which works on specified cursors and performs OPEN, FETCH & CLOSE cursor statements implicitly in the background.
Suggested Reading: Numeric For Loop In Oracle PL/SQL
Syntax of Cursor For Loop.
FOR loop_index IN cursor_name LOOP Statements… END LOOP;
Example 1: Cursor For Loop With Simple Explicit Cursor
SET SERVEROUTPUT ON; DECLARE CURSOR cur_RebellionRider IS SELECT first_name, last_name FROM employees WHERE employee_id >200; BEGIN FOR L_IDX IN cur_RebellionRider LOOP DBMS_OUTPUT.PUT_LINE(L_IDX.first_name||' '||L_IDX.last_name); END LOOP; END; /
Please watch the Video Tutorial on YouTube channel for detailed explanation of the above code.
Example 2: Cursor For Loop With Inline Cursor.
You can pass the cursor definition directly into the Cursor For Loop. The code for that is:
SET SERVEROUTPUT ON; BEGIN FOR L_IDX IN (SELECT first_name, last_name FROM employees WHERE employee_id >200) LOOP DBMS_OUTPUT.PUT_LINE (L_IDX.first_name||' '||L_IDX.last_name); END LOOP; END; /
As you can see in the above code, instead of declaring a cursor into a separate declaration section of PL/SQL block we can write the Cursor’s SELECT DML statement right inside the loop statement after IN keyword.
- Directly write the SELECT statement without specifying the cursor name into the loop statement.
- Enclose the SELECT statement into parenthesis.
- Do not terminate the SELECT statement with a semicolon (;)
How many times will Cursor For Loop execute?
Unlike Numeric For Loop with Cursor For Loop we don’t have minimum or maximum range which will decide the number of execution. So how many times will this loop execute?
This loop will execute for each row returned by the specified cursor and it will terminate either when there is no row to return or there is an occurrence of an exception.
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