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Added small paragraph on connections

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Some developers (maybe not newbies, but more coming from other languages) will be wondering if you have to close connections.  I think a quick touch on database connections and their automatic closing on script end is a helpful addition.
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Brian Nesbitt
2012-08-04 00:36:16 -03:00
parent 1bfe89a277
commit 63e0b2ee73
1 changed files with 9 additions and 0 deletions
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_posts/06-01-01-Databases.md
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@@ -52,6 +52,14 @@ database preventing potential SQL injection attacks.
* [Learn about PDO][1]
You should also be aware that database connections use up resources and it was not unheard-of to have resources
exhausted if connections were not implicitly closed, however this was more common in other languages. Using PDO you
can implicitly close the connection by destroying the object by ensuring all remaining references to it are deleted,
ie. set to NULL. If you don't do this explicitly, PHP will automatically close the connection when your script ends
unless of course you are using persistent connections.
* [Learn about PDO connections][5]
## Abstraction Layers
Many frameworks provide their own abstraction layer which may or may not sit on top of PDO. These will often emulate features for
@@ -69,6 +77,7 @@ Some abstraction layers have been built using the PSR-0 namespace standard so ca
[2]: http://www.doctrine-project.org/projects/dbal.html
[3]: http://framework.zend.com/manual/en/zend.db.html
[4]: http://packages.zendframework.com/docs/latest/manual/en/index.html#zend-db
[5]: http://php.net/manual/en/pdo.connections.php
[mysql]: http://uk.php.net/mysql
[mysqli]: http://uk.php.net/mysqli