- GDBM DATABASE AS A SEMAPHOR UPDATE
- GDBM DATABASE AS A SEMAPHOR FULL
- GDBM DATABASE AS A SEMAPHOR SOFTWARE
See the SPOPS module for the full author/helper list.
GDBM DATABASE AS A SEMAPHOR SOFTWARE
This library is free software you can redistribute it and/or modify it under the same terms as Perl itself. This is an internal method, so do not use it.Ĭopyright (c) 2001-2004, inc. This data structure is not blessed yet, it is likely just a hashref of data (depending on how you implement your objects, although the default method for SPOPS objects is a tied hashref). Returns the data structure in the GDBM database corresponding to a particular key.
Save (either insert or update) an object in a GDBM database. If you modify the 'object_key' method, you will probably want to modify this as well. Retrieve all objects from a GDBM database from a particular class. Instead it is a unique identifier for objects within this class. Note that $id corresponds not to the object key, or the value used to store the data. The default is to prepend the class to the value returned by id() to prevent ID collisions between objects in different classes. In the config file just joins the 'name' and 'version' parameters of an object and returns the result.Ĭreates a key to store the object in GDBM. (To be fair, you can also do this with the SPOPS::DBI module, it is just a little more difficult.) For example: # Read objects from one database, save to another
Instead of defining one database throughout the operation, you can change in midstream. This is also a little different than the SPOPS::DBI module in that you have a little more flexibility as to how you refer to the actual GDBM file required. Currently the interface is not as robust or powerful as the SPOPS::DBI implementation, but if you want more robust data storage, retrieval and searching needs you should probably be using a SQL database anyway. So a database named 'aliases' resides in the files 'aliases.dir' and 'aliases.pag', and name is specified as 'aliases'. pag, so name refers to the common name without extensions. If the named database does not exist, it will be created. In gdbm mode, the file is named normally in dbm and ndbm modes each database consists of two files with extensions. If not supplied, the default name junk.gdbm is used instead.
The DBFILE argument supplies the name of the database to open. Implements SPOPS persistence in a GDBM database. The gdbmtool utility allows you to view and modify an existing GDBM database or to create a new one.
GDBM DATABASE AS A SEMAPHOR UPDATE
If the update throws an exception I plan to do another SELECT to find another row, while the successful path would DELETE the row.SPOPS::GDBM - Store SPOPS objects in a GDBM database SYNOPSIS my $obj = Object::Class->new I should note that in reality I will be doing a SELECT on the table for things where claimed=0 ORDER BY RAND() LIMIT 1. Is there a way to accomplish what I'm going for via MySQL? I know I can lower the lock timeout but that would possibly impact other queries negatively. # (run process 2 below before this commits) SELECT * FROM pool WHERE id=1 FOR UPDATE However it seems my attempt during a lock just makes MySQL wait for the lock to end before making the update happen. My thought was that I can start a transaction, use a lock, try to update row, and see if it errors from having a lock. Making statements based on opinion back them up with references or personal experience. Provide details and share your research But avoid Asking for help, clarification, or responding to other answers. Therefore I have a table to track the pool. Thanks for contributing an answer to Database Administrators Stack Exchange Please be sure to answer the question. I have a service that requires maintaining a pool of external resources.
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