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Building a simple recordset

From: Dreamweaver with PHP and MySQL

Video: Building a simple recordset

Once you have defined a database connection, you're ready to retrieve data from your MySQL database. Dreamweaver makes it easy to build simple SQL statements to do this work for you. SQL stands for Structured Query Language, and it's the standard that's used to communicate with the database from any application environment. To get started with SQL, open any PHP file. I am working with the file simplers.php, which you'll find in the root folder of this site. In the Bindings panel, there is a Plus button that lets you create what Dreamweaver refers to as a binding.

Building a simple recordset

Once you have defined a database connection, you're ready to retrieve data from your MySQL database. Dreamweaver makes it easy to build simple SQL statements to do this work for you. SQL stands for Structured Query Language, and it's the standard that's used to communicate with the database from any application environment. To get started with SQL, open any PHP file. I am working with the file simplers.php, which you'll find in the root folder of this site. In the Bindings panel, there is a Plus button that lets you create what Dreamweaver refers to as a binding.

A binding is a definition of dynamic data. I'll click the Plus button and choose Recordset (Query). The Recordset dialog box has two modes: Simple and Advanced. If this is the first time you've used this dialog, you'll see the Simple version. You enter the name of the recordset, select a connection, choose a table in that database, and then supply other parameters. There is a button labeled Advanced, and when you click that, you're taken to the Advanced version of the Recordset dialog.

I am going to start with the Simple version. You can name your recordset anything you want. I typically prefix my record sets with the characters rs, so I am going to name this rsPackages. Then I'll pull down the Table list and choose the packages table. You'll see a listing of the available columns in the table. If you'll leave the Columns selection set to All, that means you're retrieving all of the columns in the entire table. If you prefer, you can choose the Selected radio button, and then holding down the Ctrl key on Windows or the Command key on Mac, you can click on the columns you want.

I'll choose these three columns: packageTitle, packageDescription, and packageGraphic. Now, I am going to test my recordset by clicking the Test button. That shows me the data that's returned from the database. I'll click OK to close the dialog, and then I'll also add a Sort parameter. I'll pull down the sort list and choose packageTitle, and then I'll leave this second option set to Ascending. Now I am ready to insert the recordset into my current web page.

I'll click OK, and I won't see any changes to the page in Design view. But I'll go to Code view and expand to fullscreen by pressing the F4 key, and I'll see that a whole bunch of PHP code has been added to my page at the top. First, I'll see a require_ once directive that includes the explorecalifornia.php file; that's the file that defines my database connection. Then there is a sequence of code that creates a select statement. A select statement in SQL retrieves data from the server.

This select statement is retrieving the three selected columns packageTitle, packageDescription and packageGraphic from the packages table, and the order by clause is sorting the data by the title field. That string is my SQL statement. The next line of code executes the query by calling a PHP function called mysql_query. It passes in the query string and the connection. This little bit of code, starting with the phrase, "or die," means that if the query doesn't work for some reason, then the PHP page should be terminated.

If everything goes well, at that point, we start fetching data by calling a function called mysql_ fetch_association, or assoc. And finally, a variable named totalRows_ rsPackages is created, which is based on the function mysql_num_rows. We're passing in the recordset and getting back the total number of rows in the recordset. So, all that code taken together executes the query, retrieves the data from the server and stores it in a set of variables, which you can use in your PHP pages.

I'll show you how to display the data in various ways in some other exercises, but I'll also point out one last bit of code that's placed at the bottom of the page and is very important. It's called mysql_free_result. This releases the reference to the recordset in the PHP server's memory. And it makes sure that you are releasing any memory that's used by storing those record sets when the current page is finished processing on the server.

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This video is part of

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Dreamweaver with PHP and MySQL

61 video lessons · 36512 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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