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Populating the relational table

From: PHP with MySQL Essential Training

Video: Populating the relational table

In the last movie, we created a new pages tables and learned how to relate it to our subjects table. We can't test out that relationship until it has some data in it, so let's add some. So here I am in MySQL. You can see that I've already created my pages table and you can see the columns from the pages table right there in front of me. That's great and easy to see. So I'm going to leave it there, and let's just type in our first insert INSERT INTO pages. And then, remember, we want to list the columns that we want to insert into it.

Populating the relational table

In the last movie, we created a new pages tables and learned how to relate it to our subjects table. We can't test out that relationship until it has some data in it, so let's add some. So here I am in MySQL. You can see that I've already created my pages table and you can see the columns from the pages table right there in front of me. That's great and easy to see. So I'm going to leave it there, and let's just type in our first insert INSERT INTO pages. And then, remember, we want to list the columns that we want to insert into it.

I'm going to leave off the ID column, because that's an auto incremented column. I'll let MySQL manage that for us. But I do want to pass in the subject ID. Menu, name, position, visible, and content. And then I'll hit Return. And now, I'm going to put into it the values, and so the first value is going to be subject_id. So this is going to be a page that will be related to the first subject_id. So it's id, the primary key of it will be 1.

And then the menu_name is going to be, Our mission. And then the position will be 1, it will be visible. And then let's give it some content, Our mission has always been ... That'll be sufficient for a placeholder. Okay, so we'll out our ending parentheses and a semicolon, hit Return, one row effected, query okay. So let's do Select All from pages now. And you can see, there it is. It created that page for us. Let's create a few more.

So I'm hitting the up arrow to go back. And I'll just make changes right here. And this time. It'll also be for subject one, but the name of it that is going to be our history, the position will be 2. It's going to be the second page, it'll be visible. And then let's just change our text here to some different placeholder text. We'll say, Founded in 1898 by two enterprising engineers. Hit Return. Now, I have two pages in there.

All right, let's add a third page, but let's make this one belong to a different subject. You just bring up our subjects again so we can see them all. Select all from subjects. The first ones are both related to ID 1. We're going to make this one related to ID number two. So I'll hit my up arrow. The first thing I need to do is shoot back over here and change the 1 to be a 2. So now, it's going to have a subject ID of 2 in order to match this ID right here. And then let's change it from our history, this products, so let's say Large Widgets. This is Widget Corp, they make widgets.

So Large Widgets. Now, it's position is going to be 1. Now, you may be thinking, wait a minute. We already had position 1 and 2. But the positions are going to be relative to the subject. So we can have 1, 2, 3 for subject one, and then we can have 1, 2, 3 for subject two, and so on. We're never going to be displaying all of the pages in a single list. They're always going to be in the context of pulling up the pages that belong to a certain subject. It'll also be visible, and then let's just shoot down here real quick and erase all this text. We'll make it say, Our large widgets have to be seen to be believed. Okay.

Let's make another one real quick. I'll erase this while I'm going back there. This one is going to be also for id 2. It'll be Small Widgets. Its position will be 2. It will also be visible and then here lets say they say big things come in small packages. We have two pages that belong with this subject and two pages that belong with this one. Let's now add two pages for the services. So let's just shoot back over here, erase all this copy.

Now, this time the subject id is going to be 3, and the copy is going to be for a service, let's call it Retrofitting. It's position will be 1, again, relative to the subject. We love to replace widgets. And then let's do one last one. This is also going to be for subject three. The name of it is going to be Certification. Read position 2. We can certify any widget, not just our own.

All right, so now we have some good placeholder copy for those and we have a set of pages. Can take a look at pages, select all, my mistake, from pages. There we go. So now you can see all the different pages that we have. And we can see all the different subjects that we have. Select all from subjects. So now we have the data in there. Let's take a look at how the relationships work. So let's say that we want to pull up a page. Let's say a user has requested to look at the Our Mission page to start with. So we say Select all from pages where id equals 1.

That's the our mission page. So we're going to display that page to the user. We found that, PHP has requested this page from us, id 1. So then it says, all right, I need the subject, so I'm going to look at my subject id and see what value I have there. And then I can make another request from subjects where id equals 1 also. Now, it's not the same 1 as this one, it's this 1, that's what we're looking at. And that returns about Widget Corp. Now, I know my subject, and I can find out all sorts of information about it. I can pick up its menu name, maybe I want to look at whether it's visible or not.

I can do that by looking up its subject. It also works in reverse. Let's pick a different one. Let's say that instead, I have a subject where the id is 3. And then now, I have 3, let's Select all from pages where subject id is also equal to 3. There they are. There's the pages that belong to this subject... So, that's how relational databases work. We're doing it by actually typing each of these commands each time. When we get to PHP, PHP will be able to pass variables around to handle a lot of this for us.

We will be able to take a variable from the URL that's asking for subject number 3. It'll be able to take that, go look in the Subjects table, return it. And then if we want to get all the pages that belong to it, it can take that same variable and go ask the pages table to return a list of the pages. That should belong to it and should be displayed. So being able to have PHP and variables is going to streamline this process.

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This video is part of

Image for PHP with MySQL Essential Training
PHP with MySQL Essential Training

131 video lessons · 34944 viewers

Kevin Skoglund
Author

 
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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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