Assignment 6 -- SQL: Queries & Updating
This first part of this assignment uses three tables: geekProducts, geekCategories
and geekProductCategories. The tables have the fields shown below.
To add these tables to your mySQL database, login into phpMyAdmin, click the "SQL"
tab, paste this phpMyAdmin SQL dump into the query field and click the Go
The first five exercises all use the same the same database. It would be a good
idea to put the connection information into a separate file and use an include statement
to import it into each php script. This eliminates duplicate connection information.
Product images are available in three sizes. The size is specified by the image
prefix: t_, m_, and L_. For instance the three sizes for the caffeine mug are: t_caffeine-mug.jpg,
m_caffeine-mug.jpg, and L_caffeine-mug.jpg.
All of your php pages should initially display neatly (no partial tables or incorrect
query results), respond gracefully when no records are found, and handle incorrect
user entries. You may add additional features, but your pages should have at least
as much functionality as the examples.
Debugging Tip: If you have problems debugging a SQL statement try
running it directly in phpMyAdmin. Echo the SQL to the browser, copy it, and paste
into phpMyAdmin under the SQL tab. Once you get it working inside phpMyAdmin then
return it to the PHP script. This approach simplifies the debugging process by separating
SQL problems from PHP problems.
CategoryItems.php - Display the items in each product
category. Copy the previous exercise and add a second query to retrieve the
items in the selected category. The SQL statement joins the tables geekProducts
and geekProductCategories on the field ItemID. Display the Name, price, thumbnail
image and short product description.
ProductsByPrice.php - List all products
under a specific price, sorted by price (primary) and name (secondary). You may
wish to use mySQL.php (source) as a template. Look in the sample's source code
to see the images URLs.
- ProductSearch.php - This page searches the
Name field and returns all records that contain any part of the query in the product
name. For instance, a search for "ff" would return "coffee" and "caffeine." The
SQL statement uses wildcards with the syntax:
"WHERE Name LIKE '%$query%' "
where $query is the string entered by the user.
- RandomProduct.php - Display a random selected
product from the database. Use the long product description and the medium size
images. The following SQL statement randomly orders the records in the database
and returns the first record:
select ItemID, Name, LongDesc, Image, price from geekproducts order by rand() limit 1;
ListCategories.php - List the product categories
as hyperlinks and display the name of the selected category. The SQL query uses
the "DISTINCT" keyword to sort the items and remove any duplicate category names.
CRUD.php - In this exercise you will add update
capability to the basic mySQL script demonstrated in class: mySQL.php (source). Steps:
- Create a new database table using phpMyAdmin. Name the table tblCustomers and give
it three fields:
- Copy and paste the basic mySQL script into a file named CRUD.php and get it working.
- Updating database records is a two step process. The first step retrieves the existing
information and populates the textboxs. The second step writes the updated information
back to the database.
Step 1: Populating the textboxes:
- Add an update link (similar to the delete link) that passes a parameter named "updateID".
- The customer data must be retrieved from the database before the textboxes are
rendered. Move the code for connecting and selecting the database to a location
above the form.
- Write code to retrieve the customer data and assign the data to local variables
named $nameL2 and $nameF2 (using slightly different variable names than those used to get nameL and NameF from the querystring).
- Populate the textboxes using the syntax:
<input type="text" name="nameF" value="<?php echo $nameF2; ?>">
- Test your code to make sure it is populating the textboxes.
Step 2: Updating the database.
- A flag is needed to indicate that the page is in the update step of the process.
The updateID also needs be be saved. Both issues can be solved by storing the updateID
in a hidden form field. Add a hidden field named updateID2 and populate it with $updateID (which is custID).
- Write an if statement that checks for updateID2 in the querystring and executes
an UPDATE SQL statement.
- Fix: the Insert code will be triggered by the update because the textboxes contain
data. Modify the if statement that triggers the insert to check that $updateID2
Submission instructions: Submit assignments via
the Canvas course management system.
Submit the full URL for each exercise in the assignment, listing the URLs
in the same order that they are listed in the assignment. To minimize typos in URLs
it is strongly recommended
that you copy the URLs from the address bar of the browser
rather than trying to type them. Incorrect URLs
will not be graded and no credit will be given.
When pages are connected via navigation (as in your Bookstore project) it is only
necessary to submit the URL of the first page.