A database cursor is a control structure that allows for traversal of records in a database. Cursors, in addition, facilitates processing after traversal, such as retrieval, addition and deletion of database records. They can be viewed as a pointer to one row in a set of rows.
Working with SQL Cursor
DECLARE @name VARCHAR(50) /* Declare All Required Variables */
DECLARE db_cursor CURSOR FOR /* Declare Cursor Name*/
SELECT name
FROM myDB.students
WHERE parent_name IN ('Sara', 'Ansh')
OPEN db_cursor /* Open cursor and Fetch data into @name */
FETCH next
FROM db_cursor
INTO @name
CLOSE db_cursor /* Close the cursor and deallocate the resources */
DEALLOCATE db_cursor
-
- DECLARE a cursor after any variable declaration. The cursor declaration must always be associated with a SELECT Statement.
- Open cursor to initialize the result set. The OPEN statement must be called before fetching rows from the result set.
- FETCH statement to retrieve and move to the next row in the result set.
- Call the CLOSE statement to deactivate the cursor.
- Finally use the DEALLOCATE statement to delete the cursor definition and release the associated resources.
