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Using the Delete Record server behavior

From: Dreamweaver with PHP and MySQL

Video: Using the Delete Record server behavior

The last step in creating a data management system is to give the user a way to delete data from the MySQL table. I'll start this exercise by creating a completely new file. I'll select File > New and then create a new blank PHP page. I'll go into Code View, and I'm going to delete all of the HTML in the page. The user will never see this page rendered in the browser. It will execute a backend database operation to delete a record and then immediately return to the list page.

Using the Delete Record server behavior

The last step in creating a data management system is to give the user a way to delete data from the MySQL table. I'll start this exercise by creating a completely new file. I'll select File > New and then create a new blank PHP page. I'll go into Code View, and I'm going to delete all of the HTML in the page. The user will never see this page rendered in the browser. It will execute a backend database operation to delete a record and then immediately return to the list page.

Then I'll save the file into the same folder that contains my other data management pages, and I'll name it explorerdelete.php. I'm going to add a server behavior. I'll go to the Server Behaviors panel, click plus, and choose Delete Record. In the Delete Record dialog, I'll check my Connection and then set the Table to Explorers. I've accepted the settings for the Primary key column and value, and then indicate that after deleting, I want to go to explorerlist.php.

When I click OK, all of the required PHP code is added to the page. Down at the bottom, PHP first checks to make sure that I have a variable named explorerId, a Get variable that will be passed from another page. It also makes sure that this variable isn't blank, and then if that's all true, it executes a deleteSQL statement, removing the requested record from the database table. Down at the bottom, it sets a variable, indicating which page we want to navigate to, and then using this command, header, sprintf, Location, deleteGoTo, it redirects the browser to that page.

In the page's current state, watch what happens if I browse it directly. I'll run the page in the browser, and I see that the page is blank. The problem is with the logic. If this condition in the 'if' statement turns out to be false, PHP simply is told, jump past all this code and don't do anything. To fix this, I'm going to take everything starting with the setting of the deleteGoTo variable, all the way through the header command. I'll cut it to the clipboard, and then paste it after the closing brace for the 'if' statement.

I'll then select most of the code and press Shift+Tab and then do a little bit more tabulation to make the code look right. If the page is called directly from the browser for some reason, instead of just showing a blank page, it will navigate to the list page. So now my page is ready to delete records. I am going to call this page from the list page. I'll go to explorerlist.php and look at it in Design View. In Design View, I'll click and drag down to select the entire final column in the table.

Then I'll right-click and choose Table > Insert Rows or Columns. Don't choose Insert Column here, because it would insert a column before the current selected column. If I choose Insert Rows or Columns, I have the option to insert a new column either before or after the current column. I will choose Columns, and one column after the current column, and click OK. Then I'll click into the final column into the second row, the row that contains the data, and I'll type the word "Delete." I'll select the word "Delete," and then go to the Link box, and I'll browse and select my new file, explorerdelete.php.

Now I'll go to Code View. Just as with the Update command, I need to pass a variable, which I'll name explorerId, to the receiving page. The easiest way to do this is to take the existing code that I already put into the Update command. So I'll go to the explorerupdate2.php href. I'll start with the question mark, and I'll take everything through the output of the explorerId column. I'll copy that to the clipboard. Then I'll go down to my new explorerdelete.php href, I'll right-click there, and paste.

I'm ready to test my delete operation. I'll save and run the list page, and when the list page is displayed, it shows a delete item for each record in the database table. I'll click Delete for my Revised Explorer record. You will see that it doesn't work quite right yet. So, I am going to go back to my list page, and I'm going to change the case of the variable that I'm passing from one page to another, so that it has an uppercase I instead of a lowercase i. I'll run the page in the browser again, I'll click Delete, and now the record is correctly removed.

It's important to match the case in the variable name and in the code that's looking for the variable in the Delete page. So now you have the ability to insert new records by clicking the Insert New Explorer link. You have the ability to update records by clicking on the First Name of any record, and you also have the ability to delete data from the MySQL database by clicking on the Delete links. Dreamweaver has generated most of the PHP code we needed, but I have made minor alterations, and along the way you've learned a good bit about how to write PHP code to manage data in a backend MySQL database.

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This video is part of

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Dreamweaver with PHP and MySQL

61 video lessons · 36122 viewers

David Gassner
Author

 
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  1. 8m 48s
    1. Welcome
      1m 25s
    2. What you should know before watching this course
      2m 17s
    3. Using the exercise files
      1m 40s
    4. Understanding the differences between Dreamweaver CS5.5 and CS6
      3m 26s
  2. 19m 31s
    1. Understanding static vs. dynamic web pages
      4m 32s
    2. Selecting application and database servers
      6m 10s
    3. Introducing Apache, MySQL, and PHP
      6m 36s
    4. Installing Apache, MySQL, and PHP
      2m 13s
  3. 39m 34s
    1. Defining a Dreamweaver site
      3m 22s
    2. Configuring a PHP testing server
      7m 48s
    3. Creating and testing a PHP-based web page
      8m 25s
    4. Adding PHP commands with the Insert panel
      3m 14s
    5. Setting and outputting simple variables
      3m 56s
    6. Testing pages with Live view and Live Code view
      2m 9s
    7. Using server-side includes
      7m 50s
    8. Navigating included pages with the Code Navigator
      2m 50s
  4. 36m 37s
    1. Using code hinting with PHP variables
      5m 31s
    2. Understanding PHP custom classes
      6m 38s
    3. Adding Zend Framework to PHP on Windows
      5m 18s
    4. Adding Zend Framework to PHP on Mac
      4m 2s
    5. Using the Site-Specific Code Hints feature
      3m 43s
    6. Using Zend Framework classes with code hints
      7m 26s
    7. Managing reusable code with the Snippets panel
      3m 59s
  5. 18m 27s
    1. Understanding relational databases
      5m 26s
    2. Creating a MySQL database in phpMyAdmin
      4m 41s
    3. Adding data in phpMyAdmin
      2m 46s
    4. Importing a completed database from a script
      5m 34s
  6. 39m 35s
    1. Defining a Dreamweaver database connection
      5m 27s
    2. Building a simple recordset
      4m 31s
    3. Building an advanced recordset
      5m 1s
    4. Displaying data with repeating regions
      6m 4s
    5. Displaying data in a dynamic table
      4m 15s
    6. Formatting dynamic data
      4m 54s
    7. Displaying the total number of records
      2m 4s
    8. Limiting records with paging controls
      4m 5s
    9. Creating conditional regions
      3m 14s
  7. 43m 12s
    1. Building a simple data entry form
      5m 27s
    2. Handling form submissions with PHP
      5m 12s
    3. Creating a customer email form
      3m 9s
    4. Validating form controls with Spry
      7m 54s
    5. Populating a list control with dynamic data
      4m 50s
    6. Working with multiple checkbox controls
      8m 5s
    7. Sending email with Zend_Mail
      8m 35s
  8. 50m 51s
    1. Using data wizards
      6m 20s
    2. Formatting dates for SQL
      5m 27s
    3. Creating a custom data entry form
      4m 50s
    4. Preparing a database table for server behaviors
      3m 3s
    5. Using the Insert Record server behavior
      5m 42s
    6. Preparing an update form
      7m 6s
    7. Using the Update Form behavior
      5m 46s
    8. Creating list page links to edit and update data
      7m 3s
    9. Using the Delete Record server behavior
      5m 34s
  9. 14m 45s
    1. Creating a login form with a PHP server behavior
      6m 29s
    2. Protecting page access with PHP server behaviors
      4m 17s
    3. Logging out with a PHP server behavior
      3m 59s
  10. 22m 50s
    1. Configuring a remote server with FTP credentials
      4m 42s
    2. Synchronizing site assets with the remote server
      5m 27s
    3. Exporting the MySQL database to a script
      3m 8s
    4. Importing the MySQL database on a remote server
      2m 24s
    5. Configuring the site for the remote database
      7m 9s
  11. 52s
    1. Final thoughts
      52s

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