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PDO and MySQLi compared

From: Accessing Databases with Object-Oriented PHP

Video: PDO and MySQLi compared

Throughout this course, I've deliberately avoided comparing PDO and MySQL In practice, differences in SQL dialects make conversion more difficult.

PDO and MySQLi compared

Throughout this course, I've deliberately avoided comparing PDO and MySQL improved, but now we've come to the end of our journey. Maybe this is an appropriate time to consider how they measure up against each other. PDO's main strength, is that the code is database neutral. You need to learn only one API to work with more than a dozen database systems. In theory, just change the DSN, and the same code works with a different database. All the scripts in chapters two, three and four, work seamlessly with SQL Lite and My SQL.

In practice, differences in SQL dialects make conversion more difficult. Also, some PDO drivers are still experimental. So, you need to check with the PHP documentation, to see how mature the driver for your chosen database system is. MySQL improves great strength, is that it's designed specifically to work with MySQL. A simple example's, the data_seek method and num_rows property, make working with MYSQL easier than using PDO.

It's also what MySQL recommends you should use. But being a dedicated API is a weakness. You can't use it with anything other than MySQL or MariaDB. Another point to take into consideration, is that the PDO driver for MySQL, is stable and actively maintained. So using PDO with MySQL, is a viable option. So if you're working with MySQL, which should you choose? If you search the internet for benchmark tests, you'll find conflicting opinions on whether MySQL runs faster with MySQLi, or PDO.

Both MySQLi and PDO access the same underlying driver that interacts directly with the database. So any differences in performance, are likely to be insignificant. WordPress and Joomla, use MySQLi, while Drupal has opted for PDO. And WordPress is also considering adding support for PDO. So there's no clear winner when it comes to working with MySQL or MariaDB. But let's say you opt for MySQLi, and later need to work on a project that requires PDO.

How difficult would it be to make the transition? If you followed both parts of this course, you'll know there are many similarities, but also some potentially confusing differences. Both support question marks as anonymous place holders in prepared statements. PDO also supports named place holders. Personally, I think this makes PDO easier to use. They have similar support for transactions. In PDO, you roll back the individual statements.

Whereas in MySQLi, it's the database connection object that does the roll back, perhaps the most confusing aspect is the different spelling of methods, PDO uses camel case whereas MySQLi uses underscores and method names but these are relatively minor issues. Making the switch from MySQLi to PDO should be fairly painless. So, with those thoughts, that concludes this course on accessing databases with object oriented PHP.

I hope you found it useful. Thanks for watching, and be sure to check out my other courses here on lynda.com.

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This video is part of

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Accessing Databases with Object-Oriented PHP

47 video lessons · 2683 viewers

David Powers
Author

 
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  1. 13m 33s
    1. Welcome
      1m 4s
    2. What you should know before watching this course
      2m 8s
    3. Using the exercise files
      4m 56s
    4. Setting SQLite permissions
      1m 11s
    5. A quick primer on using PHP objects
      4m 14s
  2. 10m 12s
    1. Overview of PHP database APIs
      4m 5s
    2. Using prepared statements
      4m 24s
    3. Using transactions
      1m 43s
  3. 48m 57s
    1. Creating a database source name
      2m 3s
    2. Connecting to a database with PDO
      7m 27s
    3. Looping directly over a SELECT query
      3m 49s
    4. Fetching a result set
      8m 3s
    5. Finding the number of results from a SELECT query
      7m 14s
    6. Checking if a SELECT query contains results
      3m 32s
    7. Executing simple non-SELECT queries
      6m 2s
    8. Getting error messages
      7m 17s
    9. Using the quote() method to sanitize user input
      3m 30s
  4. 39m 51s
    1. Binding input and output values
      2m 36s
    2. Using named parameters
      9m 51s
    3. Using question marks as anonymous placeholders
      2m 35s
    4. Passing an array of values to the execute() method
      5m 20s
    5. Binding results to variables
      7m 53s
    6. Executing a transaction
      6m 54s
    7. Closing the cursor before running another query
      4m 42s
  5. 21m 20s
    1. Generating an array from a pair of columns
      2m 44s
    2. Setting an existing object's properties with a database result
      4m 42s
    3. Creating an instance of a specific class with a database result
      6m 1s
    4. Reusing a result set
      7m 53s
  6. 38m 14s
    1. Connecting to a database with MySQLi
      5m 57s
    2. Setting the character set
      1m 57s
    3. Submitting a SELECT query and getting the number of results
      4m 4s
    4. Fetching the result
      7m 35s
    5. Rewinding the result for reuse
      3m 20s
    6. Handling non-SELECT queries
      5m 27s
    7. Getting error messages
      5m 47s
    8. Sanitizing user input with real_escape_string()
      4m 7s
  7. 27m 49s
    1. Initializing and preparing a statement
      4m 17s
    2. Binding parameters and executing a prepared statement
      5m 55s
    3. Binding output variables
      5m 6s
    4. Executing a MySQLi transaction
      7m 5s
    5. Dealing with "commands out of sync" in prepared statements
      5m 26s
  8. 24m 7s
    1. Buffered and unbuffered queries
      4m 19s
    2. Using real_query()
      6m 1s
    3. Freeing resources that are no longer needed
      2m 31s
    4. Submitting multiple queries
      6m 41s
    5. Creating an instance of a class from a result set
      4m 35s
  9. 3m 31s
    1. PDO and MySQLi compared
      3m 31s

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