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This patch introduced database transaction support to the Dba driver via
the DbaTransaction class.
The goal of this is to allow the driver control over the creation and
finalization of database transactions.
Until now code that has needed transaction support has done so directly
by issuing "BEGIN", "ROLLBACK" and "COMMIT" commands to the underlying
database directly.
This has several disadvantages:
- We do have no control or knowledge of whether any transactions being
active.
- Since transactions can not be nested, we run the risk of unrelated
code trying to create a transaction when one is already active.
- Code using transactions are not testable, as the test runner wraps
all tests within a transaction to begin with.
This patch should eliminate all these problems.
A transaction is started by instantiating the DbaTransaction class:
$my_transaction = new \DbaTransaction();
The transaction will automatically be _rolled back_ if it has not been
committed before the instance is destroyed. (When the variable holding
it goes out of scope, i.e when the containing function returns.)
A transaction is committed like this:
$my_transaction->commit();
This will immediately commit the changes in the transaction, and the
transaction will be marked as committed, so it will not be attempted to
be rolled back on destruction.
I have chosen to "ignore" the problem of nested transactions by having
the DbaTransaction class _not_ initiate a new transaction if one is
already active. This also makes the rollback and commit actions of the
DbaTransaction class into no-ops.
An alternative would be to simulate nested transactions by using save
points if a transaction is already active. However, I'm unsure about
wether there's any safe way to avoid all potential pitfalls when doing
that.
In any case, nested transactions should preferably be avoided, and
afaict we don't rely on that in any of the existing code. The reason we
need to support it in some way is that it's needed for testing where the
code under test is creating a transaction on it's own. (Since each test
is run within a db transaction to begin with.)
Also, I have taken the liberty to assume a PDO based db driver for this
stuff. I don't think that's going to be a problem, as that's the only
thing supported by the rest of the code in any case.
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The debug log will be stored in the test/results directory, and archived
as part of the artifacts of the CI run. This should make it easier to
get some debugging info out from the CI runs if they fail.
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As the Symphony\Yaml stuff disappeared with behat, we need another way
to load read the yaml files with database fixtures for the integration
tests.
As the php yaml extension is not distributed with PHP by default, this
creates it as another dev dependency!
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Not quite unit test clean, but a somewhat pragmatic approach to make the
tests pass as is.
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Move unit tests to tests/unit/. Get the old still working UnitTests
into a working state again.
Updated composer.json with required-dev packages.
Create a new folder tests/acceptance for Behat functional/acceptance
testing. Add a first Feature draft of a Behat functional test for
local login.
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