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)

AmitDiwan

Published on 07-Apr-2020 11:33:02

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