Changed self::SPECIFICATION_* to static::SPECIFICATION_* in non declarat...

[corentin-larose]

This patch allow to extend \Zend\Db\Sql\Delete|Insert|Update classes in order to very easily implement driver specific syntaxes like the MySql REPLACE, INSERT IGNORE or INSERT ON DUPLICATE KEY UPDATE etc.

For example :

<?php
namespace Qapa\Db\Sql\Mysql;

class Replace extends \Zend\Db\Sql\Insert
{
    /**#@+
     * Constants
     *
     * @const
     */
    const SPECIFICATION_INSERT = 'replace';
    /**#@-*/

    /**
     * @var array Specification array
     */
    protected $specifications = array(
        self::SPECIFICATION_INSERT => 'REPLACE INTO %1$s (%2$s) VALUES (%3$s)'
    );
}

or

<?php
namespace Qapa\Db\Sql\Mysql;

class InsertIgnore extends \Zend\Db\Sql\Insert
{
    /**#@+
     * Constants
     *
     * @const
     */
    const SPECIFICATION_INSERT = 'insertIgnore';
    /**#@-*/

    /**
     * @var array Specification array
     */
    protected $specifications = array(
        self::SPECIFICATION_INSERT => 'INSERT IGNORE INTO %1$s (%2$s) VALUES (%3$s)'
    );
}

If agreed, I will add unit tests.

[weierophinney]

@corentin-larose Looks reasonable -- please add unit tests, and we can merge. :)

[corentin-larose]

Ok, not really sure what I'm going to test yet but I gonna take a look to this.

[corentin-larose]

@weierophinney should be ok/compliant if you want to merge

[turrsis]

this const in child class is excess.
try remove it - all tests is OK.
you override specification - to my mind it is enough.
so - in this PR needs only tests changes.
maybe changes in the test not need too - if you override specification - what do you expect to see?

[turrsis]

#5323 - revert static::SPECIFICATION_* and tests is ok.