Exercise9 Create a function that displays the phone number of the recipients of a particular ordernumber from the recipient table. The function should display the phone number of therecipients on the basis of its corresponding order number from the recipient table whichuser inputs during the run time.
时间: 2023-12-29 15:04:23 浏览: 25
Sure, here's an example function in SQL that achieves this:
```
CREATE FUNCTION get_recipient_phone_number(@order_number INT)
RETURNS NVARCHAR(20)
AS
BEGIN
DECLARE @phone_number NVARCHAR(20)
SELECT @phone_number = PhoneNumber
FROM recipient
WHERE OrderNumber = @order_number
RETURN @phone_number
END
```
When a user inputs an order number as a parameter to this function, it will return the corresponding phone number of the recipient from the recipient table. Note that this assumes that the `PhoneNumber` column in the `recipient` table is of type `NVARCHAR(20)`, but you can adjust the type and length of the variable to suit your needs.
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create a session so that the number of visitors to the page, rather than the number of visits, is displayed
To create a session that counts the number of visitors to a page, you can use the following code:
```
<?php
session_start();
if(isset($_SESSION['views'])) {
$_SESSION['views']=$_SESSION['views']+1;
}
else {
$_SESSION['views']=1;
}
echo "Number of visitors: ".$_SESSION['views'];
?>
```
This code starts a session using `session_start()`. It then checks if the `$_SESSION['views']` variable is set. If it is, it increments the value by 1. If it is not set, it sets the value to 1. Finally, it displays the current value of `$_SESSION['views']`.
Place this code at the top of your PHP page to track the number of visitors to your site.
Create a procedure that displays the details of all the wrappers whose price is less than theprice entered by a user.
Sure, here's an example procedure in SQL that achieves this:
```
CREATE PROCEDURE display_wrappers_by_price
@price DECIMAL(10, 2)
AS
BEGIN
SELECT *
FROM wrapper
WHERE Price < @price
END
```
When a user enters a price as a parameter to this procedure, it will display the details of all the wrappers from the wrapper table whose price is less than the entered price. Note that this assumes that the `Price` column in the `wrapper` table is of type `DECIMAL(10, 2)`, but you can adjust the type and precision of the parameter to suit your needs.