Declaration of Explicit Cursor
- Declaration of cursor: The Cursor is declared in the declaration section of the PL/SQL block.
DECLARE
CURSOR cursor_name IS select_statement from the table.
CURSOR is used to declare the cursor name like a function is used in JavaScript to declare a function.
- Open the cursor: It helps to allocate the memory for the cursor from the context area. It is declared in the BEGIN section .
BEGIN
OPEN cursor_name;
- Fetch the cursor: It is used to retrieve the data from the table into a variable. It helps to access rows at a time. It is also declared in the BEGIN section .
BEGIN
FETCH cursor_name INTO variable_list;
- Close the cursor: As work associated with a cursor is completed, memory allocated is released.
CLOSE cursor_name;
PL/SQL Parameterized Cursors
PL/SQL stands for Procedural Language/ Structured Query Language. It has block structure programming features. With PL/SQL, you can fetch data from the table, add data to the table, make decisions, perform repetitive tasks, and handle errors.PL/SQL supports SQL queries. PL/SQL contains declaration block, begin block, exception block, and end block. Declare and exception blocks are optional.
In this article, we will explore PL/SQL Cursors and their parameters, providing insights into the declaration of explicit cursors and the step-by-step process involved. The focus will then shift to the dynamic capabilities of PL/SQL Cursors with Parameters, demonstrating how to create adaptable SQL queries.