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I'm converting all my sites code from using mysql_* functions to PDO. The PHP documentation on PDO is not clear for my needs. It gives you the functions to use, but does not go into detail to explain them in different scenarios.
Basically, I have a mysql fulltext search:
$sql = "SELECT ... FROM search_table WHERE MATCH(some_field) AGAINST ('{$searchFor}*' IN BOOLEAN MODE)";
The actual statements much longer, but this is what it basically does.
My question is, how would I incorporate this into PDO?
I know you're not meant to use quotes around the place-marker, so do you leave them out in the AGAINST() function? Do I include them? If I leave them out, what happens to the wildcard symbol etc?
$sql = $this->db->prepare("SELECT ... FROM search_table WHERE MATCH(some_field) AGAINST(:searchText IN BOOLEAN MODE");
$sql->bindValue(':searchText', $searchFor . '*');
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PDO will work on 12 different database systems, whereas MySQLi will only work with MySQL databases. So, if you have to switch your project to use another database, PDO makes the process easy. You only have to change the connection string and a few queries.
MySQLi is a replacement for the mysql functions, with object-oriented and procedural versions. It has support for prepared statements. PDO (PHP Data Objects) is a general database abstraction layer with support for MySQL among many other databases.
Full-text indexes are created on text-based columns ( CHAR , VARCHAR , or TEXT columns) to speed up queries and DML operations on data contained within those columns. A full-text index is defined as part of a CREATE TABLE statement or added to an existing table using ALTER TABLE or CREATE INDEX .
A PDO database connection requires you to create a new PDO object with a Data Source Name (DSN), Username, and Password. The DSN defines the type of database, the name of the database, and any other information related to the database if required. These are the variables and values we stated inside the dbconfig.
This is unfortunately a weird exception to the use of query parameters (edit: but apparently not in the most recent point-release of each MySQL branch, see below).
The pattern in AGAINST() must be a constant string, not a query parameter. Unlike other constant strings in SQL queries, you cannot use a query parameter here, simply because of a limitation in MySQL.
To interpolate search patterns into queries safely, use the PDO::quote() function. Note that PDO's quote() function already adds the quote delimiters (unlike mysql_real_escape_string()).
$quoted_search_text = $this->db->quote('+word +word');
$sql = $this->db->prepare("SELECT ... FROM search_table
WHERE MATCH(some_field) AGAINST($quoted_search_text IN BOOLEAN MODE");
Re comment from @YourCommonSense:
You're right, I just tested this on MySQL 5.5.31, 5.1.68, and 5.0.96 (MySQL Sandbox is a wonderful tool), and it seems that these versions do accept query parameters in the AGAINST() clause of a dynamic SQL query.
I still have a recollection of a conflict existing in the past. Maybe it has been corrected in the most recent point-release of each branch. For example, I find these related bugs:
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