PDO version of Sphider

Sphider 1.5.1 has proven to be a good, stable version of Sphider. HOWEVER, it seems some people can’t use it because their host chooses not to support MySQLnd, typically for shared hosting. It isn’t because it can’t be done, but because they don’t want to do it. In those instances, if you want MySQLnd, you to have to upgrade to VPS, at an additional charge of course. Sphider users in that scenario now have an option.

We have taken Sphider 1.5.1 and converted the sql to PDO (PHP Data Objects). PDO support is virtually guaranteed. The PDO version is referred to as Sphider PDO has some advantages over MySQLi/MySQLnd, but there are also disadvantages.

MySQLi/MySQLnd is SPECIFIC to a MySQL database, where PDO is a generic supporting a variety of databases, one of which is MySQL. There is an overhead involved. For Sphider, we STILL consider the MySQLnd prepared statement methodology over PDO prepared statements. Reality dictates a PDO version be made available. Our recommendation is that you install the PDO version only if the standard MySQLi/MySQLnd option is not available. If you already have a working Sphider 1.5.1, DO NOT install

One issue encountered was that PDO has no need to use the real_escape_string function…. EXCEPT WHERE IT IS NEEDED!!! The backup and restore functions failed without it. All research indicated “You don’t need real_escape_string, just use PDO prepared statements!” Dogmatic statements like that can come back to bite you. Well, our scenario wasn’t executing sql, it was CREATING sql, specifically, an sql string. Real_escape_string was necessary to create a valid string, and a prepared statement was not possible. We had ALREADY run a query, now we were manipulating the queried data to create a string for LATER use in a different kind of query. So we had to create an emulation for real_escape_string, which was a bit of trial and error. So much for “PDO NEVER needs real_escape_string”.