Stored Procedures

The article describes the stored procedures in the Sakila sample database.

There are 3 stored procedures defined in the Sakila database. The following describes each stored procedures.

film_in_stock

The film_in_stock stored procedure determines whether any copies of a given film are in stock at a given store.

Parameters

p_film_id
The ID of the film to be checked, from the film_id column of the film table.
p_store_id
The ID of the store to check for, from the store_id column of the store table.
p_film_count
An OUT parameter that returns a count of the copies of the film in stock.

Return Values

This procedure produces a table of inventory ID numbers for the copies of the film in stock, and returns (in the p_film_count parameter) a count that indicates the number of rows in that table.

Sample Usage

CALL film_in_stock(1,1,@count);
Output
+--------------+
| inventory_id |
+--------------+
|            1 |
|            2 |
|            3 |
|            4 |
+--------------+
4 rows in set (0.01 sec)

Query OK, 1 row affected (0.01 sec)

SELECT @count;
Output
+--------+
| @count |
+--------+
|      4 |
+--------+
1 row in set (0.00 sec)

film_not_in_stock

The film_not_in_stock stored procedure determines whether there are any copies of a given film not in stock (rented out) at a given store.

Parameters

p_film_id
The ID of the film to be checked, from the film_id column of the film table.
p_store_id
The ID of the store to check for, from the store_id column of the store table.
p_film_count
An OUT parameter that returns a count of the copies of the film not in stock.

Return Values

This procedure produces a table of inventory ID numbers for the copies of the film not in stock, and returns (in the p_film_count parameter) a count that indicates the number of rows in that table.

Sample Usage

CALL film_not_in_stock(2, 2, @count);
Output
+--------------+
| inventory_id |
+--------------+
|            9 |
+--------------+
1 row in set (0.01 sec)

Query OK, 1 row affected (0.01 sec)

```sql
mysql> SELECT @count;
Output
+--------+
| @count |
+--------+
|      1 |
+--------+
1 row in set (0.00 sec)

rewards_report

The rewards_report stored procedure will generate a list of top customers in the last month specified by the parameter.

Parameters

min_monthly_purchases
The minimum number of purchases or rentals a customer needed to make in the last month to qualify.
min_dollar_amount_purchased
The minimum dollar amount a customer needed to spend in the last month to qualify.
count_rewardees
An OUT parameter that returns a count of the customers who met the qualifications specified.

Return Values

This stored procedure produces a table of customers who met the qualifications specified. The table has the same structure as the customer table. The stored procedure also returns (in the count_rewardees parameter) a count that indicates the number of rows in that table.

Sample Usage

CALL rewards_report(7, 20.00, @count);
Output
...
| 598         | 1        | WADE        | DELVALLE     | [email protected]         | 604        | 1      | 2006-02-24 10:48:30 | 2006-02-15 04:57:20 |
| 599         | 2        | AUSTIN      | CINTRON      | [email protected]        | 605        | 1      | 2006-02-24 10:48:30 | 2006-02-15 04:57:20 |
...

42 rows in set (0.11 sec)

Query OK, 0 rows affected (0.67 sec)

SELECT @count;
Output
+--------+
| @count |
+--------+
|     42 |
+--------+
1 row in set (0.00 sec)