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CRUD in MySQL

From: PHP with MySQL Essential Training

Video: CRUD in MySQL

Now we've created a data base and we've added our subjects table to that data base we're ready to start working with data. In order to do that we need to talk about CRUD. Specifically how we do CRUD in the context of MySQL. You'll remember that I told you CRUD was an acornym. It stands for Create, Read, Update, and Delete and those are the four main operations that we perform on databases. Now, all the other MySQL that we've been learning, all those other little statements, you don't need to commit those to memory. You can go look those up whenever you need them because you're not going to need them that often.

CRUD in MySQL

Now we've created a data base and we've added our subjects table to that data base we're ready to start working with data. In order to do that we need to talk about CRUD. Specifically how we do CRUD in the context of MySQL. You'll remember that I told you CRUD was an acornym. It stands for Create, Read, Update, and Delete and those are the four main operations that we perform on databases. Now, all the other MySQL that we've been learning, all those other little statements, you don't need to commit those to memory. You can go look those up whenever you need them because you're not going to need them that often.

You'll go and set up a database and create a table at the beginning of your project, but then after that you're not going to be working with them much. You're mostly going to be doing create, read, update, and delete. So this is the syntax that you want to commit to memory. These are the things that are important that you want to stick to, because you're going to be using them 90 to 95 percent of the time. Not the other stuff. I still go back and look up some of the particulars of the other syntax some other time. So let's go take a look at how we do each of one these in MySQL. And let's start, not with create, but with read. And the reason why I want to start there, is because read is the one that you're going to use the very most. We read back data form, more often than we change it. And even when we do go to make a change, we typically read the data before the change.

And then read the data again after the change to make sure that it's right. So we're going to do lots and lots of database reading. And we're going to do that in mysql using the select statement. This is a typical syntax for select statement. Let's walk through it together. So to begin with we have Select. We're saying we're going to select some records from the database. That's telling it to read them. After that, we tell it what columns, we want it to include in the data that it brings back to us. An asterisk means bring back all columns, I want to see everything. We could also specify we could say, we just want to see ID comma menu name comma position comma. And then any other columns that are there, won't be sent back to us. It'll just return those columns.

So the asterik the one the you'll see the most often, but again you can specify a common delimited list of column names. And then from table, now between those two lines, I've got it broken up on two lines, MySQL doesn't mind that. But you're going to want to make sure that there always is a space between those two so that MySQL can tell the difference. And then the FROM tells it where we're pulling from. And then our table name and then the next two lines are optional. We could just simply say show me everything from the table. And it'll return all the records to you all columns.

Or we can specify, we can say, show me the rows from the table where, something is true. Column is equal to some_text. Now notice there's a single equals here. It's not a double equals like we do in PHP where column equals some_text and now all rows that match that condition will be returned to us. And then we also can specify the ORDER. Order by and tell it how we want it to sort it. They don't have to sorted in the default order, we have MySQL sort them for us. And so here, I've said sort it by column 1, ascending.

Ascending means from A to Z, A first, Z last. If we did descending, which would be desc, then it would sort them in reverse order, Z first and A last. Then there are lots of other options that we can add to this, our where statements can be a lot more complex. But this is the basic way that we pull back data from the database. So you're definitely going to want to commit this one to memory, because it's the one you're going to be using the most often of anything you do in SQL. So now let's look at how we do a create, and we do that with the SQL INSERT statement.

We INSERT INTO, the table name, and then we provide a list of the columns Inside parenthesis with commas between them. Then we're going to insert into, we don't have to insert data into every column, we don't have to list them all out. But we're going to list the ones that we're going to be using followed by the values, and then in parenthesis all the values that should go in those columns. And then of course it's common sense that those values need to be in the same orders as the columns. Otherwise it wouldn't know where to put them, so val1 is going to be into column1 and val2 is going to go into column2.

And of course there need to be the same number of values as there are columns. They're going to need to match up, and that's it. That's all there is to doing an SQL INSERT statement. Okay, so let's look at an update. So this means that there's already data in the database. We have a row for a record. Let's say it's a customer and we want to update their address. Well, we do that using the UPDATE statement. UPDATE table SET column1 equal to some_text. That's it, set that column, whatever it is, equal to some text. And if we had more of those, then we'd just put a comma followed by additional ones that we wanted to set. So each one would just be a key value pair with the equals sign in between, and then WHERE id equals 1.

We don't have to specify this but most often you will. If we were only updating one row in the table then we want to specify, we want to say update it where this id is 37. If we didn't specifiy that it would change all the customers. So suddenly we would have all our customers with the same address, because we didn't specify what id, what row we were looking for. So becareful about that. And then, last of all, we have DELETE. So this is an SQL DELETE statement. We say DELETE FROM table where id equals 1, or id equals 37.

It's going to delete that row from the database. Now, we don't have to use id as the specifier. We could say, DELETE FROM table where first name equals Kevin, then all rows where Kevin is equal suddenly disappear. They all get deleted at the same time, it can be very powerful but most often we're going to just be deleting a single row, we're going to identify it by it's unique id. So those are the four main ways that we're going to work with CRUD in MySQL. That's the syntax for it. So you can come back here if you need to refer to it later. We're going to be working on it more over the course of the next few movies. Don't worry if it seems like a lot to take in at first. Once you do these a few times, it's going to become second nature very quickly.

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This video is part of

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PHP with MySQL Essential Training

131 video lessons · 39096 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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