MySQL Stored Procedure Beginners Tutorial #14 - Basics of Cursor in MySQL Stored Procedure | Cursor

Published: 04 August 2019
on channel: Online Web Tutor

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In this video we'll see:

Basics of Cursor in MySQL Stored Procedure | Cursor

ABOUT MYSQL CURSOR
============================

MySQL cursor in stored procedures to iterate through a result set returned by a SELECT
statement.

To handle a result set inside a stored procedure, we use a cursor. A cursor allows you to
iterate a set of rows returned by a query and process each row accordingly.

SYNTAX TO FOLLOW TO USE CURSOR
==================

1. DECLARE cursor_name CURSOR FOR SELECT_statement;

2. OPEN cursor_name;

3. DECLARE CONTINUE HANDLER FOR NOT FOUND // termination statement

4. FETCH cursor_name INTO variables list;

5. CLOSE cursor_name;

Example:

BEGIN

DECLARE finished int default 0;

DECLARE emails_list varchar(500) default "";

DECLARE email varchar(50) default "";

DECLARE user_data CURSOR FOR SELECT email from tbl_users limit 5;

DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished = 1;

OPEN user_data;

get_user_email: LOOP

FETCH user_data INTO email;

IF finished = 1 THEN

LEAVE get_user_email;

END IF;

SET emails_list = CONCAT(emails_list,", ",email);

END LOOP get_user_email;

CLOSE user_data;

SELECT emails_list;

END

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