How to create and call stored procedure in MySQL with IN and OUT parameters
Create and Call MySQL stored procedure with IN Parameters
Here is the command to create a MySQL stored procedure with one IN
parameter, here we are getting total number of employee by department, dept_id is a foreign
key from department table.
mysql> DELIMITER //
mysql> create procedure
usp_totalEmployeeByDeparment(IN id INT)
-> begin
-> select count(*) as total from employee where dept_id = id;
-> end//
Query OK, 0 rows affected (0.00 sec)
mysql> DELIMITER ;
We have first changed delimiter as // to mark end
of stored procedure, and then reverted it back to previous delimiter. Also
using “usp” as prefix for user defined stored procedure is one of the SQL best
practices to separate system and user stored procedures. Now you can call this stored
procedure from MySQL command prompt as :
mysql> call
usp_totalEmployeeByDeparment(2);
+-------+
| total |
+-------+
| 1 |
+-------+
1 row in set (0.06 sec)
Creating and Calling MySQL stored procedure with IN and OUT parameters
In this MySQL example, we have created stored procedure usp_GetEmployeeName which
takes one IN and one OUT parameter. While calling this stored procedure, you
need to pass two parameters, id and name. One would be input parameter id and other would be output
parameter to store result.
mysql> DELIMITER //
mysql> create procedure
usp_GetEmployeeName(IN id INT, OUT name VARCHAR(20))
-> begin
-> select emp_name into name from employee where emp_id = id;
-> end//
Query OK, 0 rows affected (0.52 sec)
mysql> DELIMITER ;
mysql> call
usp_GetEmployeeName(103, @name);
Query OK, 1 row affected (0.05 sec)
Calling stored procedure from MySQL command line:
mysql> select @name;
+-------+
| @name |
+-------+
| Jack |
+-------+
1 row in set (0.00 sec)
That's all on How to create and call MySQL stored procedure from
command line. In this MySQL tutorial, we have seen examples of creating
stored procedure using IN and OUT parameters. These are one of the best way to
remember and recall syntax of stored procedure in MySQL database.
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