Error updating public folder with busy
Although this tutorial is based on mysql driver, the information, in general, is applicable for any driver supported. Although this feature is magnificent by itself, it doesn't make a big deal for the particular application, where only one database backend is used anyway.And, despite some rumors, it is impossible to switch database backends by changing a single line in PDO config - due to different SQL flavors (to do so, one needs to use an averaged query language like DQL).Not only it is needed too seldom to talk about, but the performance gain is not that big - query parsing is real fast these times. Just like it was shown above, what you need is to prepare a query with placeholders, and then execute it, sending variables separately.Note that you can get this advantage only when emulation mode is turned off. There is absolutely nothing special in these queries. Either for Note that this method is memory-friendly, as it doesn't load all the resulting rows in the memory but delivers them one by one (though keep in mind this issue).If no variables are going to be used in the query, you can use the PDO::query() method.It will run your query and return special object of PDOStatement class which can be roughly compared to a resource, returned by function and thrown into the harsh world of Data Objects: PDO has prepared statements support out of the box.
This feature would have been more useful if it was possible to execute a statement prepared in another PHP instance. So, you are limited to repeating the same query only within the same instance, which is seldom needed in regular PHP scripts and which is limiting the use of this feature to repeated inserts or updates: Note that this feature is a bit overrated.
Say, a code like this ) placeholders, the latter always begins from a colon and can be written using letters, digits and underscores only.
Also note that no quotes have to be ever used around placeholders.
It's nothing complicated though - instead of one plain and simple list of options, PDO asks you to input different configuration directives in three different places: Note that it's important to follow the proper format - no spaces or quotes or other decorations have to be used in DSN, but only parameters, values and delimiters, as shown in the manual.
Here goes an example for mysql: More details regarding Mysql can be found in the corresponding chapter, Connecting to My SQL There are two ways to run a query in PDO.
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As a result, half of PDO's features remain in obscurity and are almost never used by PHP developers, who, as a result, are constantly trying to reinvent the wheel which Unlike those, this tutorial is written by someone who has used PDO for many years, dug through it, and answered thousands questions on Stack Overflow (the sole gold PDO badge bearer). The abstraction, however, is two-fold: one is widely known but less significant, while another is obscure but of most importance.