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Formatting dates for SQL

From: Dreamweaver with PHP and MySQL

Video: Formatting dates for SQL

In a previous video, I described how to use the Record Insertion Wizard to create a data entry form that would collect information from the user and add it to the MySQL database, but I showed that there is a challenge with working with dates. That's because the code that's created by Dreamweaver doesn't do an adequate job of formatting dates as they're expected by MySQL. I'm working in the file, insertfromwizard2.php, in the root folder of the current site. Here is the problem code.

Formatting dates for SQL

In a previous video, I described how to use the Record Insertion Wizard to create a data entry form that would collect information from the user and add it to the MySQL database, but I showed that there is a challenge with working with dates. That's because the code that's created by Dreamweaver doesn't do an adequate job of formatting dates as they're expected by MySQL. I'm working in the file, insertfromwizard2.php, in the root folder of the current site. Here is the problem code.

It starts with a case statement, and it's within a function named GetSQLValueString. The case statement for dates assumes that the user has typed in a value in a format that's acceptable to MySQL. Clearly, that isn't always the case. So I'm going to replace this string with a little bit more complex PHP code that uses the Zend_Date class that I've demonstrated in previous videos. I'll go to the top of the file and add a require_once command to incorporate the Zend_Date class into my page.

I'll add a PHP code block and then the require_once command and then the Zend/Date.php file. Make sure you complete the PHP code block at this point. Then go down to the offending code. Here is the line of code I need to replace. I'm going to select and delete it, and then I'll replace it with a complete if else statement. I'll start by creating the entire conditional logic, with if and a pair of parentheses, and a pair of braces, and then an else, and another pair of braces.

Then I'll go back to the parentheses after the if and add the condition I'm examining. I'm asking the question, did the user type in a value at all? I'll enter $theValue and then the equality operator, double equals, and then quote, quote, meaning blank string, Dreamweaver's syntax checking now shows me that there are no syntax errors. I now have a complete conditional block. If the value that the user typed in is blank, I'm going to set it to a value of null, using a very simple assignment statement of theValue =, and then the word "NULL" in uppercase.

In the else clause, I'm going to assume that the user typed in a value formatted as a date, in the format month/day/year, and eventually I'll add validation rules into my data entry form that ensures the value is typed in in this format. I'll take the value the user typed in and turn it into an instance of the Zend_Date class. I'll create a variable called zendDate, and I'll create it from a new instance of the Zend_Date class, and the first value that I'll pass in is the value that the user typed in in the form, theValue.

The second part is the format that I'm expecting. I'll type that in as a literal string, using quote, an uppercase M for the Month, then a slash, then a lowercase d for the date as a number, then a slash, and then four ys for the year. I now have an instance of the Zend_Date class, representing the value the user typed in. I can format it any way I want. I'll create a new line of code, and I'll replace the variable of theValue using a single quote, a formatted date, and another single quote.

I'll start with a single quote wrapped in double quotes, then a period, indicating that I'm going to concatenate, or append another value. Then I'll call the zendDate objects to string method. I'll pass in a formatting string, indicating the formatting that's expected by MySQL. In double quotes, it will look like this: yyyy for a four-digit year, then a dash, then MM in uppercase, then a dash, then dd in lowercase for the day, and finally, I'll concatenate another single quote at the end.

So now I have a formatted date string wrapped in single quotes. That's the extent of the changes to my data entry form's code. I'll save my changes and then run the form in the browser. I'll type in some values. The FirstName will be Mikey, then Jones. Make sure that you type in a valid date of birth in the common format used in the United States. I'll type in a value of 5/12/1963, type in any e-mail address, and then type in any other values you like in the rest of the form.

Because of certain restrictions in the database structure, you must type in values into all of these form controls. Once you've typed in all of the values, click Insert record. You should go directly to the explorerlist page and see that this time the date was entered correctly. Here is my new record, and the date is displayed, formatted by the Zend_Date class. So that's a look at how to customize your data entry forms after Dreamweaver has generated the code.

This strategy can be used both for code that's generated by the Record Insertion Wizard and for code that's added to existing forms, which I'll show you how to build in another video.

Show transcript

This video is part of

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Dreamweaver with PHP and MySQL

61 video lessons · 36398 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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