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Connecting to different databases with PHP Data Objects (PDO)

From: Exporting Data to Files with PHP

Video: Connecting to different databases with PHP Data Objects (PDO)

PDO, which stands for PHP Data Objects, is a database abstraction layer designed to PDO supports a large number of databases. One of the main drawbacks, is that each database system Some drivers are still experimental.

Connecting to different databases with PHP Data Objects (PDO)

PDO, which stands for PHP Data Objects, is a database abstraction layer designed to overcome to problem of needing to use different functions, to communicate with each database system. The idea behind PDO is that you can switch a replication, to a different make of database without having to change your code. PDO supports a large number of databases. The main ones are listed here. So, in theory, you could switch from MySQL to Microsoft SQL Server or Firebird.

In practice, it's not quite so straightforward. One of the main drawbacks, is that each database system tends to use its own dialect of structured query language. Full portability is practical only if your queries use core SQL syntax. Each database system relies on a dedicated PDO driver. Many servers have the drivers from MySQL and SQLite, but exact availability depends on your hosting company or server administrator.

You can check what your server supports by running php info. Some drivers are still experimental. You can check the current status in the PHP online documentation at this address. To communicate to the database using PDO you need to supply a database source name or DSN. This is simply a string that begins with a prefix, which identifies the PDO driver you want to use. In other words, the type of database you're connecting to. The prefix is followed by a colon and a series of name values pairs, separated by semicolons.

Let's take a look at a few examples. MySQL uses host for the server and dbname for the database. If you're connecting to MySQL on a non-standard port, you need to specify that as a separate name value pair. The DSN for SQLite3 is the prefix SQLite followed by a fully qualified path to the database file. The syntax for Microsoft Sequel server is very similar to MySQL, but is uses server instead of host and database instead of DB name.

You can check all the options for each PDO driver in the PHP documentation at the address shown here.

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This video is part of

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Exporting Data to Files with PHP

44 video lessons · 2652 viewers

David Powers
Author

 
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  1. 5m 57s
    1. Welcome
      59s
    2. What you should know before watching this course
      2m 42s
    3. Using the exercise files
      2m 16s
  2. 28m 3s
    1. Loading the test data into a database
      4m 8s
    2. Querying the database with MySQL Improved
      6m 4s
    3. Connecting to different databases with PHP Data Objects (PDO)
      2m 26s
    4. Querying the database with PDO
      7m 47s
    5. Displaying the data in a webpage
      5m 1s
    6. Autoloading classes
      2m 37s
  3. 38m 47s
    1. Outputting the database result to a text file
      6m 32s
    2. Outputting the result as a CSV file
      6m 53s
    3. Introducing the Base class for file downloads
      4m 37s
    4. Using the Text class for greater control over output
      7m 20s
    5. Controlling CSV options with the Csv class
      6m 49s
    6. Saving the data to a local file
      6m 36s
  4. 51m 42s
    1. Introducing PHPExcel
      3m 31s
    2. Setting properties and defaults in PHPExcel
      6m 58s
    3. Setting the spreadsheet's print options
      5m 59s
    4. Populating an Excel spreadsheet with data
      7m 46s
    5. Formatting columns in PHPExcel
      5m 47s
    6. Downloading the data as a .xlsx file
      5m 18s
    7. Creating a spreadsheet in the OpenDocument format
      3m 4s
    8. Creating columns and headers in Fusonic SpreadsheetExport
      6m 27s
    9. Adding the data and downloading as a .ods file
      6m 52s
  5. 22m 10s
    1. Installing PHPRtfLite
      3m 27s
    2. Defining the page margins and the footer
      6m 55s
    3. Setting heading and paragraph styles
      5m 18s
    4. Adding the data and outputting a .rtf file
      6m 30s
  6. 16m 35s
    1. Understanding the basic process
      3m 52s
    2. Merging XML documents with XSLT
      4m 13s
    3. Preparing a directory to generate the output
      1m 48s
    4. Generating XML from a database result
      6m 42s
  7. 27m 17s
    1. Creating a .odt file to use as a template
      4m 29s
    2. Inspecting the structure of an OpenDocument text file
      2m 43s
    3. Extracting the main content file from a .odt document
      5m 2s
    4. Converting the main content file to XSLT
      8m 3s
    5. Outputting the database result as a .odt file
      7m 0s
  8. 29m 0s
    1. Creating a .docx file to use as a template
      3m 37s
    2. Extracting the main content file from a Word document
      5m 28s
    3. Formatting the main content file
      3m 38s
    4. Converting the main content file to XSLT
      6m 18s
    5. Outputting the database result as a .docx file
      6m 4s
    6. Offering a choice of download formats
      3m 55s
  9. 3m 25s
    1. Goodbye
      3m 25s

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