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:

Tips and Tricks

A list of user-submitted tips ...

F.A.Q

A compilation of some user's questions...

Technical Change History

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

WebDNA Modules

A list of the currently available modules...

WebDNA Libraries

A list of available libraries for WebDNA...

[biotype]

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

Related Readings:

[return]

Explicitly identify what text is returned from a function call...

[encrypt]

[encrypt] and [decrypt] allow you to store sensitive data in your databases without risk of exposing it to prying eyes...

[closedatabase]

[CLOSEDATABASE db=FileName]...

formulas.db

The formulas...

[validcard]

Checks legitimacy of credit card...

[movefile]

This instructions move a file from one location to another...