Prevents other threads from simultaneously accessing a group of databases.
numero = 200[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]
[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]
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A list of user-submitted tips ...
Technical Change HistoryThis Technical Change History provides a reverse chronological list of WebDNA changes...
AWS Raw WebDNA LAMP-Plus WebServerAmazon Web Services (AWS) README for Machine Image ID...
WebDNA ModulesA list of the currently available modules...
WebDNA LibrariesA list of available libraries for WebDNA...
WebDNA reference...
[COMMITDATABASE db=name...
[listfields]Lists all the fields in the specified database...
[exclusivelock]Prevents other threads from simultaneously accessing a group of databases...
[regex][regex] is a full implementation of grep...
[addlineitem]Adds a product to the specified shopping cart...
[capitalize]Capitalizes the first letter of all words in a sentence...