explicitly display mysqli error

[michalbundyra]

Minor change to show mysqli errno and error explicitly. Without this, mysqli errors do not get shown in some debuggers when preparing sql statements, for example whoops.

Here is an example with whoops before

and after the change.

I think some components already use this style, for example zend-http/src/Client/Adapter/Socket.php line 278.

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Originally posted by @ConorSheehan1 at zendframework/zend-db#269

[michalbundyra]

@mwillbanks I'm having some trouble creating a mock connection to a database. I've pushed up my attempt in the last commit. Sorry, it's a bit messy. I tried following the Pdo test setup as an example. Could you give me some suggestions on how to create an appropriate mock or stub for the db connection?

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Originally posted by @ConorSheehan1 at zendframework/zend-db#269 (comment)

[weierophinney]

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If you have a security issue, please follow our security reporting guidelines.
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• doctrine/dbal