Support manual transaction and make sure only one transaction active

[swznd]

No description provided.

[swznd]

upps.. sorry it seems duplicate with #102

but with different style.

try {
    \QB::beginTransaction();
    \QB::table('table')->insert(['column' => 'data']);
    \QB::table('table_2')->insert(['column' => 'data']);
    \QB::commit();
} catch (\Exception $e) {
    \QB::rollback();
}

[acburdine]

@swznd: wouldn't it be a better idea to use booleans instead of 0 and 1 to check if a transaction is active?

[swznd]

hmm, if using booleans, when we call commit in another function/module it will disturb the previous transaction, because it just check true or false, without knowing how much transaction has been started.

For example, we meet the condition like this:

\QB::transaction(function($qb) {
    $insertId = $qb->table('table')->insert(['column' => 'data']);

    $anotherId = anotherFunction($insertId);

    \QB::table('table_3')->where('another_id', $anotherId)->update(['column' => 'data']);
});

function anotherFunction($id) 
{
    try {
        \QB::beginTransaction();
        $insertId = \QB::table('table_another')->insert(['table_id' => $id, 'column' => 'data']);
        \QB::commit();
    } catch (\Exception $e) {
        \QB::rollback();
        throw $e;
    }

    return $insertId;
}

when commit / rollback in anotherFunction executed it will disturb the transaction outside, so the next query will not run inside transaction as expected.

for reference:
laravel/framework#1686
laravel/framework#1823

[mrcnpdlk]

I had similar problem.
Its my solution below (pseudocode):

function firstQuery(){
   $qb->table('table_1')->insert($data1).....
}
function secondQuery(){
   $qb->table('table_2')->update($data2).....
}
function thirdQuery(){
   $qb->table('table_3')->delete().....
}

Main class/function:

$inTransaction = $qb->pdo()->inTransaction();
try {
    if (!$inTransaction) {
        $qb->pdo()->beginTransaction();
    }
    firstQuery();
    secondQuery();
    thirdQuery();
    if (!$inTransaction) {
        $qb->pdo()->commit();
    }
} catch (Exception $e) {
    if (!$inTransaction) {
        $qb->pdo()->rollBack();
    }
}

Of course for all sub-function/methods and main function/method instance of $qb have to by the same - only one connection to DB. In each method we should check if we are in transaction, then we can stack and nest methods/functions.