Store a column's value into a MySQL stored procedure’s variable
To declare a variable, use DECLARE in a MySQL stored procedure. Let us first create a table −
mysql> create table DemoTable2034
-> (
-> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> StudentName varchar(20),
-> StudentAge int
-> );
Query OK, 0 rows affected (0.49 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable2034(StudentName,StudentAge) values('Chris',23);
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable2034(StudentName,StudentAge) values('David',21);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable2034(StudentName,StudentAge) values('Robert',25);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable2034(StudentName,StudentAge) values('Mike',19);
Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −
mysql> select *from DemoTable2034;
This will produce the following output −
+-----------+-------------+------------+
| StudentId | StudentName | StudentAge |
+-----------+-------------+------------+
| 1 | Chris | 23 |
| 2 | David | 21 |
| 3 | Robert | 25 |
| 4 | Mike | 19 |
+-----------+-------------+------------+
4 rows in set (0.00 sec)
Here is the query to create a stored procedure and store the above table’s column value in a stored procedure variable −
mysql> delimiter //
mysql> create procedure select_into_variable(id int)
-> begin
-> declare name varchar(50);
-> select StudentName into name from DemoTable2034 where StudentId=id;
-> select concat('Your Name is= ',name);
-> end
-> //
Query OK, 0 rows affected (0.09 sec)
mysql> delimiter ;Call the stored procedure −
mysql> call select_into_variable(4);
This will produce the following output −
+-------------------------------+
| concat('Your Name is= ',name) |
+-------------------------------+
| Your Name is= Mike |
+-------------------------------+
1 row in set (0.04 sec)
Query OK, 0 rows affected (0.06 sec)
Published on 07-Apr-2020 15:03:02
