<atomic> mark a block as being atomic

name

atomic

xml namespace

http://moyaproject.com/db

Makes the enclosed block atomic.

An atomic block works much like <transaction>, but uses the databases SAVEPOINT feature to better handle nested atomic blocks.

Example

<!--- taken from Moya Social Links -->
<db:atomic>
    <db:get model="#Link" let:id="link" dst="link" />
    <db:get model="#Vote" let:link="link" dst="vote" />
    <db:create if="not vote"
        model="#Vote" let:link="link" let:user=".user" let:score="score" dst="vote" />
    <let link.score="link.score - vote.score" vote.score="score" />
    <let link.score="link.score + vote.score" />
</db:atomic>

attributes

name	purpose	type	required?	default	choices
db	Database	text	No	"_default"

inherited attributes

name	purpose	type	required?	default	choices
if	Conditional expression	expression	No	yes