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Example code of mfn/cakephp2-postgres-no-meta

Informations about the package cakephp2-postgres-no-meta

CakePHP2 - Postgres driver with custom adaptions

This driver was changed in the following ways:

1) The default CakePHP 2.x Postgres driver uses getColumnMeta to infer column types from the server. Although the PHP part has been optimized in recent years [1], it still incurs an overhead to hit the Postgres database on every call with a query like SELECT RELNAME FROM PG_CLASS WHERE OID=... [2]

Thus, this implementation is born which foregoes any use of the meta data and simply uses PDO::FETCH_ASSOC.

2) There's a problem with special crafted SQL statements which contain the \ character [3] which actually isn't CakePHP specific but a problem of the underlying PDO/PgSQL driver [4].

The method \Postgres::value() was overriden to apply the special C-style escape operation to strings [5].

3) The default PHP/PDO lastInsertId always returns a string. This driver is adapted to return an integer if is_numeric returns true on it. This allows easier integration with codebases using strict_types=1.

Requirements and Installation

  1. You need at least CakePHP 2.10.12
    For CakePHP >= 2.0 and < 2.10.12 , you can use version 0.0.2 of this package
  2. Add the line "mfn/cakephp2-postgres-no-meta": "^0.0.6" to your app/composer.json
  3. Run php composer.phar require mfn/cakephp2-postgres-no-meta

  4. Load the plugin in app/Config/bootstrap.php with the line

  5. Use the driver in your app/Config/database.php: PostgresNoMeta.Database/PostgresNoMeta (instead of Database/Postgres)
  6. Profit!

Rational

During the switch of a big application from MySQL to Postgres it was discovered that much overhead was lost on Postgres and it was finally discovered that these meta queries incur a measurable overhead.

The individual queries are very fast but, depending on your queries, they may add up until a measurable point.

In our case there were performance improvement of up to 50% without any additional changes except activating this class. YMMV.

A little bit later also found problems with the generated SQL statements, which in special cases were translated from:

to

before sent to the server, causing various problems.

Further reference

All versions of cakephp2-postgres-no-meta with dependencies

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