Technical References - [exclusivelock]

Prevents other threads from simultaneously accessing a group of databases.

numero = 200
interpreted = N
texte = [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. [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:

[biotype]

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

AWS Raw WebDNA LAMP-Plus WebServer

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

F.A.Q

A compilation of some user's questions...

WebDNA reference

...

Technical Change History

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

WebDNA Modules

A list of the currently available modules...

Related Readings:

[listfields]

Lists all the fields in the specified database...

[listfiles]

When listing files...

[renamefile]

Rename a file in your webspace...

[regex]

[regex] is a full implementation of grep...

[raw]

Displays enclosed text without interpreting the [xxx] tags in any way...

[search]

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