Technical References - [exclusivelock]

Prevents other threads from simultaneously accessing a group of databases.

[exclusivelock database list]...WebDNA...[/exclusivelock]

To prevent a group of databases from being modified by other threads (other 'hits' to the server, or other templates or triggers), wrap an [exclusivelock] context around the WebDNA code which will be making the important exclusive changes.

Example:

[exclusivelock db=orders.db&db=lineitems.db&db=accesslog.db]
...search, delete, or modify any of orders.db, lineitems.db, or accesslog.db while being assured that no other threads can modify any of these databases until the closing /exclusivelock tag is reached.
[/exclusivelock]


The list of database names is first alphabetized so as to maintain a consistent locking order (a technique which prevents internal deadlocks), then each database lock is acquired one at a time until all locks are acquired, then the interior WebDNA is executed. If any lock cannot be acquired, the other databases are unlocked, and the interior WebDNA is not executed.

DOWNLOAD WEBDNA NOW!

Top Articles:

WebDNA Libraries

A list of available libraries for WebDNA...

Tips and Tricks

A list of user-submitted tips ...

AWS Raw WebDNA LAMP-Plus WebServer

Amazon Web Services (AWS) README for Machine Image ID...

WebDNA Modules

A list of the currently available modules...

[biotype]

BioType is a behavioral biometrics WebDNA function based on ADGS research and development (from version 8...

Technical Change History

This Technical Change History provides a reverse chronological list of WebDNA changes...

Related Readings:

[replacefounditems]

Replaces each found record in a database with the new field values...

[shownext]

[shownext] is a special context used to create links (or more accurately...

[search]

Use the [Search] context with [founditems] to easily retrieve records from your databases...

[time]

Putting [time] in your template displays the current time set on your web server's clock...

[input]

[url]...

order file

File Formats - Order File/Shopping Cart in WebDNA...