Connection parameters are cached hashed

Start SQL Server using a synchronous command to avoid intermittent login failures

Added badges for AppVeyor

See https://github.com/doctrine/dbal/pull/2617#discussion_r177250225.

fix typo

Set Appveyor to use PHP 7.2

Following a working cache example https://github.com/morozov/diff-sniffer-core/blob/master/.appveyor.yml

Test SQL Server 17 on Travis

Testing of MSSQL on Windows with AppVeyor

PHPUnit 7

Documentation: Warn against using object fields in MySQL and MariaDB

Bump CS version to 3.0

Escape LIKE metacharacters

A string is made of characters, an array might contain anything.

[DBAL-2953] Fixed unqualified PDO class name

This should take care of most idiosyncracies.

See
https://stackoverflow.com/questions/1881853/select-without-a-from-clause-in-oracle

array_merge will not work with any iterable