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PHP with MySQL Essential Training

Admin CRUD


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PHP with MySQL Essential Training

with Kevin Skoglund

Video: Admin CRUD

In this movie, we're going to create all the CRUD we need for managing Admin users in our Admin area. That is, the ability to list the users, to add new ones, to edit them, and to delete them. We're not going to worry about any of the login or authentication or encryption or anything just yet. This is just simple CRUD, the same kind of stuff you've been doing before. And you should be able to do it on your own by applying what we learned about subjects and pages. So what I'd like us to do is I'm going to show you the demo of the version I created. Then you can pause the movie, go off and try to create it for yourself applying everything you've learned so far. And then come back and I'll actually show you my code so you can compare. The pages that you're going to need to create are going to include manage_admins.php.
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  1. 4m 8s
    1. Welcome
      1m 0s
    2. Using the exercise files
      3m 8s
  2. 15m 6s
    1. What is PHP?
      3m 52s
    2. The history of PHP
      2m 51s
    3. Why choose PHP?
      4m 10s
    4. Installation overview
      4m 13s
  3. 54m 53s
    1. Overview
      2m 33s
    2. Working with Apache Web Server
      6m 56s
    3. Changing the document root
      7m 24s
    4. Enabling PHP
      6m 16s
    5. Upgrading PHP
      3m 30s
    6. Configuring PHP
      10m 3s
    7. Installing MySQL
      5m 46s
    8. Configuring MySQL
      7m 24s
    9. Text editor
      5m 1s
  4. 31m 25s
    1. Overview
      3m 27s
    2. Installing WampServer
      5m 46s
    3. Finding the document root
      2m 24s
    4. Configuring PHP
      8m 12s
    5. Configuring MySQL
      5m 45s
    6. Text editor
      5m 51s
  5. 19m 12s
    1. Embedding PHP code on a page
      6m 43s
    2. Outputting dynamic text
      5m 55s
    3. The operational trail
      2m 27s
    4. Inserting code comments
      4m 7s
  6. 1h 18m
    1. Variables
      7m 50s
    2. Strings
      4m 38s
    3. String functions
      8m 54s
    4. Numbers part one: Integers
      6m 27s
    5. Numbers part two: Floating points
      5m 25s
    6. Arrays
      10m 0s
    7. Associative arrays
      6m 37s
    8. Array functions
      6m 33s
    9. Booleans
      3m 50s
    10. NULL and empty
      5m 15s
    11. Type juggling and casting
      8m 27s
    12. Constants
      4m 43s
  7. 27m 37s
    1. If statements
      6m 0s
    2. Else and elseif statements
      4m 16s
    3. Logical operators
      7m 30s
    4. Switch statements
      9m 51s
  8. 42m 15s
    1. While loops
      8m 41s
    2. For loops
      5m 59s
    3. Foreach loops
      8m 16s
    4. Continue
      8m 28s
    5. Break
      4m 8s
    6. Understanding array pointers
      6m 43s
  9. 37m 25s
    1. Defining functions
      8m 25s
    2. Function arguments
      5m 32s
    3. Returning values from a function
      7m 33s
    4. Multiple return values
      4m 53s
    5. Scope and global variables
      6m 2s
    6. Setting default argument values
      5m 0s
  10. 20m 18s
    1. Common problems
      3m 47s
    2. Warnings and errors
      8m 36s
    3. Debugging and troubleshooting
      7m 55s
  11. 57m 57s
    1. Links and URLs
      5m 33s
    2. Using GET values
      5m 35s
    3. Encoding GET values
      8m 41s
    4. Encoding for HTML
      9m 26s
    5. Including and requiring files
      7m 40s
    6. Modifying headers
      6m 45s
    7. Page redirection
      6m 43s
    8. Output buffering
      7m 34s
  12. 1h 3m
    1. Building forms
      7m 28s
    2. Detecting form submissions
      5m 59s
    3. Single-page form processing
      7m 57s
    4. Validating form values
      10m 40s
    5. Problems with validation logic
      9m 54s
    6. Displaying validation errors
      7m 23s
    7. Custom validation functions
      6m 28s
    8. Single-page form with validations
      7m 25s
  13. 28m 5s
    1. Working with cookies
      2m 49s
    2. Setting cookie values
      5m 55s
    3. Reading cookie values
      6m 1s
    4. Unsetting cookie values
      4m 51s
    5. Working with sessions
      8m 29s
  14. 48m 39s
    1. MySQL introduction
      6m 43s
    2. Creating a database
      7m 41s
    3. Creating a database table
      7m 42s
    4. CRUD in MySQL
      5m 48s
    5. Populating a MySQL database
      7m 32s
    6. Relational database tables
      6m 40s
    7. Populating the relational table
      6m 33s
  15. 56m 4s
    1. Database APIs in PHP
      4m 51s
    2. Connecting to MySQL with PHP
      7m 45s
    3. Retrieving data from MySQL
      8m 47s
    4. Working with retrieved data
      6m 12s
    5. Creating records with PHP
      6m 58s
    6. Updating and deleting records with PHP
      9m 6s
    7. SQL injection
      3m 5s
    8. Escaping strings for MySQL
      6m 45s
    9. Introducing prepared statements
      2m 35s
  16. 35m 58s
    1. Blueprinting the application
      7m 19s
    2. Building the CMS database
      5m 14s
    3. Establishing your work area
      4m 38s
    4. Creating and styling the first page
      4m 22s
    5. Making page assets reusable
      6m 36s
    6. Connecting the application to the database
      7m 49s
  17. 32m 49s
    1. Adding pages to the navigation subjects
      5m 58s
    2. Refactoring the navigation
      6m 7s
    3. Selecting pages from the navigation
      6m 2s
    4. Highlighting the current page
      5m 26s
    5. Moving the navigation to a function
      9m 16s
  18. 1h 45m
    1. Finding a subject in the database
      9m 48s
    2. Refactoring the page selection
      10m 52s
    3. Creating a new subject form
      6m 55s
    4. Processing form values and adding subjects
      11m 20s
    5. Passing data in the session
      9m 16s
    6. Validating form values
      9m 40s
    7. Creating an edit subject form
      8m 30s
    8. Using single-page submission
      7m 44s
    9. Deleting a subject
      9m 44s
    10. Cleaning up
      10m 37s
    11. Assignment: Pages CRUD
      4m 30s
    12. Assignment results: Pages CRUD
      6m 10s
  19. 39m 26s
    1. The public appearance
      8m 52s
    2. Using a context for conditional code
      11m 37s
    3. Adding a default subject behavior
      6m 9s
    4. The public content area
      5m 51s
    5. Protecting page visibility
      6m 57s
  20. 1h 3m
    1. User authentication overview
      4m 3s
    2. Admin CRUD
      8m 41s
    3. Encrypting passwords
      7m 26s
    4. Salting passwords
      5m 42s
    5. Adding password encryption to CMS
      11m 54s
    6. New PHP password functions
      3m 13s
    7. Creating a login system
      11m 28s
    8. Checking for authorization
      5m 48s
    9. Creating a logout page
      5m 40s
  21. 2m 4s
    1. Next steps
      2m 4s

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PHP with MySQL Essential Training
14h 24m Beginner Jun 04, 2013

Viewers: in countries Watching now:

PHP is a popular, reliable programming language at the foundation of many smart, data-driven websites. This comprehensive course from Kevin Skoglund helps developers learn the basics of PHP (including variables, logical expressions, loops, and functions), understand how to connect PHP to a MySQL database, and gain experience developing a complete web application with site navigation, form validation, and a password-protected admin area. Kevin also covers the basic CRUD routines for updating a database, debugging techniques, and usable user interfaces. Along the way, he provides practical advice, offers examples of best practices, and demonstrates refactoring techniques to improve existing code.

Topics include:
  • What is PHP?
  • Installing and configuring PHP and MySQL
  • Exploring data types
  • Controlling code with logical expressions and loops
  • Using PHP's built-in functions
  • Writing custom functions
  • Building dynamic webpages
  • Working with forms and form data
  • Using cookies and sessions to store data
  • Connecting to MySQL with PHP
  • Creating and editing database records
  • Building a content management system
  • Adding user authentication
Subjects:
Developer Servers Programming Languages Web Development
Software:
MySQL PHP
Author:
Kevin Skoglund

Admin CRUD

In this movie, we're going to create all the CRUD we need for managing Admin users in our Admin area. That is, the ability to list the users, to add new ones, to edit them, and to delete them. We're not going to worry about any of the login or authentication or encryption or anything just yet. This is just simple CRUD, the same kind of stuff you've been doing before. And you should be able to do it on your own by applying what we learned about subjects and pages. So what I'd like us to do is I'm going to show you the demo of the version I created. Then you can pause the movie, go off and try to create it for yourself applying everything you've learned so far. And then come back and I'll actually show you my code so you can compare. The pages that you're going to need to create are going to include manage_admins.php.

Or if you prefer you could call that list admins.php. And then new_admin.php, notice that it's singular. That's the process for created a new admin. For now, don't worry about encrypting the password, go ahead and just have it save a plain text password. That's a bad practice. We're going to get rid of that very soon, but for now just go ahead and have it save whatever the password is in the database in plain text. And then edit_admin, which will allow us to edit an admin's record. Delete_admin to delete them. And then you'll probably want to add some functions to includes functions.php, such as find_all_admins and find_admin_by_id.

Again, for those, you can look up what we did for subjects and pages and copy it over. You'll just have to make a few changes because it's a little bit different. We're not, for example, using a public context. These are always private and there's no reason to return admins who are visible or not, because we don't have that attribute on admins. They just have a username and a password. Let me show you my version. So, to begin with, I'm in my public, admin.php. That's my menu for my Admin area. And I have a link here for Manage_Admin_Users, which takes me to manage_admins.php.

Notice it says Manage Admins up here at the top, and notice that I'm using that layout context, which is adding admin up here at the top. Don't forget that. And then I've got a loop that's looping through all of the users that are in my database. All of the admins. And there's only one right now. I have (UNKNOWN) that I created and that user has an edit and a delete action. Those are just links and you can see that they're going to pass the ID of that user to the next page so that the next page can look them up. I can also add a new admin. Let's try that now. That takes me to newadmin.php. Let's create one for Jane Smith and the password, I'll put in secret. Notice that the password is using a password type field, and that's allowing me to have those bullets instead of showing the password. When I click create admin, I get a message at the top saying admin was created, and now I see her here in the list.

I'm sorting these users alphabetically, by the way, and so the usernames are username ascending. And if we go to add a new admin, we don't put any information in. Of course, we have our validations to kick in. Username can't be blank, password can't be blank. And if I click cancel, I'll go back to the main list. And then for Jane Smith, let's edit it. Let's make her user name Jane E.Smith. Now, the password here does require me to enter it again. I can't edit her record without providing a password. Because my validations are going to require it. Now, you could write fancier code that would say, well, don't always change the password just because they changed the username or something. But for now we're going to keep it simple and I'm just going to put in the password.

So, I'll put back in secret again, edit admin and now her username is Jane Smith. And if I click Delete, it comes up and says, are you sure, click okay and now it says, admin deleted and she's gone. So that's it. That's the process. Again, I'm just storing those passwords as plaintext in the database. So that's all you need to do for now. Just store the username and the password in the database, and we'll talk about how to encrypt those a little later. So pause the movie now and try it for yourself if you don't want any spoilers. Because the next thing I'm going to do is I'm going to show you the code that I used to create this.

So, if we come over to our directory of Widget Corp, you can see that I've got manage admins here. Manage admins is pretty simple and straight forward, I've got a function here, find all admins. Let's just jump over and look at that real quick. It's inside functions, and it's very similar to what I did for find all subjects. So it takes the global connection, makes a query, select all from admins, order by username, ascending. Then it executes that query and returns the admin set. Pretty simple.

It's also while we're here, we'll take a look at the other function, find admin by id. Again, very similar to what we did for find subject by id. We take an admin ID as argument. We use mysqli real escape string on that, to make sure that we have a safe version of it. And we select from the database, all admins where that ID matches with limit 1. And then we go ahead and take the additional step of seeing, is there a user there? If we find that admin. If we can pull one out of that set by using mysqli_fetch association.

We return it, otherwise, we return null. So those are the only two functions that I wrote. Let's close that all up. So here's find all admins using layout context for admin above my header. Then for my navigation I've just got a non breaking space. We don't need all those pages or anything like that, we'll just leave that blank. I've got my message here, which I will want to be able to return messages if they're there. If they're in the session and I get sent to this page so I've got that function being called. Then I've just got a simple table. I've thrown in a little bit of style information here. I've got user name, and I've got actions, and then I've got a loop. While I'm able to find an admin in the admin set, then its output. Don't forget to use HTML entities and URL encode and we're going to output the user name, and then a link.

One link to edit admin, another link to delete admin, with that same bit of JavaScript that we were using before. And down here's just a simple link to newadmin.php. So let's go to newadmin.php, let's take a look at that. And we've got what we had before for submitting a form. Here's my form processing, I'm requiring the field's username and password. Notice that I'm just calling it password in my form, I'm not calling it hashed password. That's because, down here, if I don't get any errors, then I'm setting hashed password equal to whatever came in from the password.

Alright, so it's hashed password, and then hashed password. Is what I'm inserting into the database, username and hash password. Now, we're not doing any hashing right now, but we will. We'll worry about that in a minute. For now, we're just simply taking the plain text and moving it over to hash password without hashing it. So then we do a simple submit and either the admin was created or failed. If it wasn't a submission, then we just go ahead and display the form. We've got our message and our form errors create_admin in the simple form using that password type field. And making sure that we use name equals submit on it as well so that it triggers that other behavior if it sees name submit being submitted in the form values.

And then cancel just goes back to manage admins. Let's take a look at edit admin. It's basically the same thing that we just had. The one difference is that we're going to find admin by ID using that get ID and then take that admin. And if we don't have an admin, redirect them back to the admins page. You could also put a message or something there saying sorry, I couldn't find it. But for now, we'll just send them back to that page as if it was a mistake. And then if it's set, if it was submitted, we do the exact same process we did before, the one difference is we're just using id is equal to the admin id.

And so then when we do our update here, we're going to update where id equals that id. Again hash password is just using regular password. And then the form looks almost identical to what we ha before, with just a few changes like the fact that it says edit admin. And that its action is going to submit somewhere different, and notice it includes the id, because it's going to need that id once we submit the edit admin form. And last of all, delete admin, so delete admin is where to find the admin by id again, same as the other one.

And the whole process is the same except that we're just going to delete from admins where id equals id. We're not worried about what the username or password is, we're just saying okay, you gave me an id I'm going to delete it. And so it does that and redirects us immediately. There's no HTML to render at the bottom. So that's it. You can pause the movie and go back if you want to copy any of that down or compare it against yours. It doesn't have to work exactly the same as mine. If yours is a little bit different, that's fine, the main idea is just to make sure that you're able to manage the admins from your admin area. All right, now we stored our passwords in plain text, and that's a terrible idea. In the next movie, we'll talk about why and what to do about it.

Find answers to the most frequently asked questions about PHP with MySQL Essential Training.


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Q: This course was revised on 6/4/2013. What changed?
A: The old version of this course was 6 years old and it was time for a complete revision, using PHP 5.4. (The tutorials will work with any version of PHP and covers any differences you might encounter). The author has also added updated installation instructions for Mac OS X Mountain Lion and Windows 8. The topics and end project are the same, but the code is slightly different. It also addresses frequently asked questions from the previous version.
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