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PHP PDO Cache Query: Retrieve PDO query results from cache variables

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2018-07-10 (7 days ago) RSS 2.0 feedNot enough user ratingsTotal: 125 This week: 28All time: 8,783 This week: 11Up
Version License PHP version Categories
cpdo 0.2.27Free for non-comm...5PHP 5, Databases, Cache
Description Author

This package can retrieve PDO query results from cache variables.

It extends the base PDO class and override some functions to handle database query execution and store the query results in variables.

The class can also return query results for cached queries for previously executed queries to retrieve the results faster for repeated queries.

  Performance   Level  
Name: Marco Cesarato <contact>
Classes: 4 packages by
Country: Italy Italy
Age: 22
All time rank: 3273133 in Italy Italy
Week rank: 1 Up

Details

CPDO - Cache PDO Query Class

Version: 0.2

This package can retrieve PDO query results from cache variables.

It extends the base PDO class and override some functions to handle database query execution and store the query results in variables.

The class can also return query results for cached queries for previously executed queries to retrieve the results faster for repeated queries.

It permit to have cached SELECT/SHOW/DESCRIBE queries on Memory (RAM). Then after the execution the cache will be deleted.

Cache is cleaned on INSERT/UPDATE/DELETE/TRUNCATE... only for the single table.

What problem this solves

When we call the same query (for example on ORM based system) we retrieve from the database the same data doing the same operation and some time we overload the database server (for example retrieving big data multiple times).

This class prevent to do the same query on the database, retrieving the data from memory without overload the database server in some cases.

Requirements

  • PHP
  • Database

Databases supported (CPDO::connect)

  • 4D
  • CUBRID
  • Firebird/Interbase
  • IBM
  • Informix
  • MS SQL Server
  • MySQL
  • ODBC and DB2
  • Oracle
  • PostgreSQL
  • SQLite

Usage

You have to use this class as PDO.

CPDO introduced these new methods:

Method connect

This feature is a DSN autogeneration and you have to use it instead of the constructor.

Usage of connect

$db = CPDO::connect($database_type, $database_name, $database_host = null, $database_user = null, $database_pswd = null);

Method getTables

Return the names of all database tables as array

Method backup

You can backup Data (At the moment no TRIGGERS, VIEWS and EVENTS _if you need it you can request it to the developer_). You can choose if you want the tables you want backup through an array.

Usage of backup

$db->backup($backup_dir, $backup_tables = '*');

Debugger

You can enable/disable the debugger using the following methods (default is disabled):

$db->enableDebug();
$db->disableDebug();

For retrieve logs use this method:

CPDOLogger::getLogs();

For clean logs use this method:

CPDOLogger::cleanLogs();

Example of logs

array (
  'count' => 3,
  'queries' => 
  array (
    'SET NAMES \'utf8\'' => 
        array (
          0 => 
          array (
            'time' => 1530610903,
            'execution_time' => 0.000247955322265625,
            'cached' => false,
          ),
          1 => 
            array (
              'time' => 1530610903,
              'execution_time' => 0.000077955322265625,
              'cached' => false,
            ),
        ),
    'SELECT id FROM _deleted_records_ WHERE table = \'settings\' LIMIT 1' => 
        array (
          0 => 
          array (
            'time' => 1530610903,
            'execution_time' => 0.00050687789916992188,
            'cached' => false,
          ),
        ),
  ),
)

(Not recommended) Persistent cache

PS: this usage is not recommended!!!

If you want a persitent you can use the method CPDOCache::populate for populate the cache and CPDOCache::retrieve for retrieve the cache.

Thanks this methods you could implement a persistent cache system saving the data encoded (with json or serialization) and after restore the cache.

Pro: - Less database stress - Less queries

Cons: - Could compromise data - Could be slower (disk performance/clients connected)

Example of usage


// Your loader/includes... => with require_once('CPDO.php');

$database_cache_path = '/your/cache/path/database.json';

$cache = file_get_contents($database_cache_path);
$cache = json_decode($cache); // Or unserialize (slower)
CPDOCache::populate($cache);
unset($cache);


// Your code...


$cache = CPDOCache::retrieve();
$cache = json_encode($cache); // Or serialize (slower)
file_get_contents($database_cache_path, $cache);
unset($cache);
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