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Preparing an update form

From: Dreamweaver with PHP and MySQL

Video: Preparing an update form

Just as with inserting data into a database, you can create a data entry form to update data using Dreamweaver's update record server behavior. Before you use the server behavior though, you need to prepare the form to display data from a single record that the user wants to update. I'll be working in the file explorerupdate. php, in the Explorers folder of my site root. The first step is to add a binding, or recordset to the form, to retrieve a single record from the database table. I'll go to the Bindings panel and click plus and choose Recordset or Query.

Preparing an update form

Just as with inserting data into a database, you can create a data entry form to update data using Dreamweaver's update record server behavior. Before you use the server behavior though, you need to prepare the form to display data from a single record that the user wants to update. I'll be working in the file explorerupdate. php, in the Explorers folder of my site root. The first step is to add a binding, or recordset to the form, to retrieve a single record from the database table. I'll go to the Bindings panel and click plus and choose Recordset or Query.

I'll give my recordset a name of rsExplorer. Notice I am using the singular version of Explorer, rather than the plural version, because I am only going to retrieve the single record, filtered by the primary key of the table. Then I'll choose the Explorers table. I'll click Selected, and then holding down Ctrl on Windows or Command on Mac, I'll select only the fields that I want to display in the form: the explorerId, firstName, lastName, dob, email, address, and make sure that I've also selected the state.

I am going to filter. I'll pull down the list of available columns and choose the primary key column for this table, explorerId. The default SQL statement will be designed to retrieve a single record, filtered on the primary key column, explorerId, looking for a URL parameter, known in PHP as a Get variable, and by default, the name of the variable will be the same as the column name;, explorerId. I'll click the Test button and provide a test value for the primary key.

I'll provide a value of 1. I'll click OK, and I'll see that I've retrieved all of the columns I need to fill in my data entry form. I'll click OK, and click OK again, and that adds the SQL statement or recordset to the form page. I'll add information to the form controls to cause them to display the values from the retrieved record. I'll start with the First Name column. I'll click on the text field and then go down to the Properties panel.

I'll click the Bind to Dynamic Source button, the lightning bolt for that column, and I'll choose the matching column in the database, the First Name column in the rsExplorer Recordset, and click OK. I'll do the same thing for each of the other text fields: The Last Name, and Date of Birth, the Email address, the Address, and the City.

If for any reason I've forgotten one of the columns, as I have here, I can cancel out, go back to the Bindings panel, double-click on the recordset to reopen it, and then, holding down the Ctrl key, I can select the column that I missed. Make sure you're holding down Ctrl on Windows or Command on Mac when you do the click; otherwise, you will deselect everything else. I'll click OK, and that updates the recordset in the page. Go back to the City field, and once again click the Bind to Dynamic Source button, and now I should be able to choose the City column.

You can also set the current value for a select control. I'll click on the State select control, and I'll go to the Properties panel and click Dynamic. And then for set value equal to, I'll click the lightning bolt button, and I'll choose the matching column, state. I'll click OK and click OK again, and now my data entry form will match whatever value is passed to it when the file opens. There is one more column though, that you need to account for. When you're working with an HTML data entry form for managing data, you have to pass the primary key value of the current record from the form to the action, that is to the page that's going to process the request by the user.

You do this with a hidden data entry form field. I'll click right after the Submit button in the form, then I'll switch to Code View, and I'll check the location of the cursor. You need to make sure that the cursor is inside the form. A hidden field won't affect the appearance of the form at all, but if it's placed say outside the form, where I have placed the cursor now, the value won't be passed from form to action. So I'll place the cursor right before the ending form tag. Then I'll go to the Insert panel and choose Forms, and I'll add a hidden field.

Because I'm in Code View, I get the Tag Editor Dialog box. I'll click OK, then go back to Design View and show you that the hidden form field is displayed by this icon in the upper-right. Again, don't worry about its visual appearance, or its placement on the screen; because it's hidden, it will be invisible to the user. I'll select the Hidden Field that I created, then I'll click into the Properties panel, and I'll assign the name matching the name of the database column for the primary key, explorerId.

Don't worry about the case. It doesn't matter whether it's uppercase, lowercase, or mixed case. It just has to match the name of the database column in the table. Then I'll go to the value, and just as I did with the text fields, I'll click the Dynamic button, and I'll match this controls value to the explorerId column in the recordset, and I'll click OK. If you save and test the form at this point, it won't be quite right. I'll click and preview, and you'll see that the form is displayed with nothing in it. Here is why.

Let's take a look at the generated code. I'll go to the Code View, and then I'm going to press Ctrl+F on Windows or Command+F on Mac, and I am going to search for rsExplorer. I'll click Find Next, and you'll see that you may not get to the actual definition of the recordset. But if you click Find All, you'll get a listing of all references, and here is the code I am looking for. There is a variable that's generated by Dreamweaver called colname_rsExplorer, which is set to a default of -1.

In the Search panel, I'll double-click on that bit of code, and that takes me to line 40 in my page, where the value is being set. This is the default primary key value for the record that will be displayed in the form. Because I am not connecting this page to the rest of my data entry or data management system yet, I'm just going to change this value so that I am displaying the data from the first record in the table. I'll change the default value of the primary key column from -1, which means I am not retrieving anything, to 1, which means I am retrieving the record with that primary key value.

I'll save my change, and then I'll preview the page in the browser, and now I see the data from the record with a primary key value of 1. There is one more step to follow, which is updating the date format, and I'll show you how to do that in another video.

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This video is part of

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Dreamweaver with PHP and MySQL

61 video lessons · 36315 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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