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  • query processing library Lambda DB Monoid Comprehension Calculus Relational Algebra Lambda DB includes a C implementation of the algorithms described in Optimizing Object Queries Using an Effective Calculus above Outer Join Processing Outerjoin Simplication and Reordering for Query Optimization Outerjoins as Disjunctions Misc Optimization Techniques Performing Group By before Join Guy with a 300 page draft on query compilation Optimizing Queries across Diverse Data Sources Python Stuff Integrating Diverse Data

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  • Attachments for "DatabaseReferences" - The PEAK Developers' Center
    FrontPage RecentChanges TitleIndex WordIndex SiteNavigation HelpContents Attached Files No attachments stored for DatabaseReferences You are not allowed to upload files ShowText of this page EditText of this page FindPage by browsing title search text search or an index Or try

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  • DatabaseReferences - The PEAK Developers' Center
    Monoid Comprehension Calculus Relational Algebra Lambda DB includes a C implementation of the algorithms described in Optimizing Object Queries Using an Effective Calculus above Outer Join Processing Outerjoin Simplication and Reordering for Query Optimization Outerjoins as Disjunctions Misc Optimization Techniques Performing Group By before Join Guy with a 300 page draft on query compilation Optimizing Queries across Diverse Data Sources Python Stuff Integrating Diverse Data Sources with Gadfly 2 SQLObject

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  • DomainModelReferences - The PEAK Developers' Center
    Clear message Useful references which describe the Domain Model concept which is also called the DomainModelDesignPattern see Domain Model topic and related topics in the Wiki Domain Driven Design a new book focusing entirely on domain model design PatternsOfEnterpriseApplicationArchitecture an excellent book by Martin Fowler which discusses domain modelling and codifies many important enterprise level design patterns EditText of this page last modified 2003 10 25 15 39 02 FindPage

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  • Local Site Map for "DatabaseReferences" - The PEAK Developers' Center
    The PEAK Developers Center FrontPage RecentChanges TitleIndex WordIndex SiteNavigation HelpContents DatabaseReferences view EditText of this page FindPage by browsing title search text search or an index Or try one of

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  • DatabaseReferences - The PEAK Developers' Center
    Visual Visualization Wido above across ai algorithms an and as before book chimu citeseer class com compilation conferences cos558 cs db dbs de described dia dow96 draft edu etc fegaras98optimizing for haas97optimizing handouts implementation in includes informatik it lambda language library links maine mannheim manual marburg mathematik mit mitarbeiter moer nec net nj object of on operations optimization org orm page papers pdf pi3 proceedings processing projects publications python queries query regarding research select semantics shaw89query sql sqlobject staff stuff syntax the uni uniroma3 user using usm uta vldbproc watters wirsam with workshops xxl yan94performing Clear message Useful links regarding query processing optimization etc Conceptual Queries ORM Conceptual Queries and the ConQuer query language A Query Algebra for Object Oriented Databases Optimizing Object Queries Using an Effective Calculus Generic Functions CLOS DB stuff Gestalt class A Persistent Multi user CLOS Application Environment Open Source Implementations XXL a Java query processing library Lambda DB Monoid Comprehension Calculus Relational Algebra Lambda DB includes a C implementation of the algorithms described in Optimizing Object Queries Using an Effective Calculus above Outer Join Processing Outerjoin Simplication and Reordering for Query Optimization Outerjoins as Disjunctions Misc Optimization Techniques Performing Group By before Join Guy with

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  • PEAK API Reference
    changing PEAK API s that take filenames to also accept stream sources Added an optional base argument to naming parseURL to allow parsing URLs relative to a base URL For a URL scheme to support this it must implement the new naming IBaseURL interface See the peak naming factories openable module for example implementations Added a data URL scheme implementing RFC 2397 although it s not as strict in its parsing of the content type and parameters as the RFC calls for This is a semi convenient way to provide configuration data in line since a data URL can be a config getStreamFactory source Added config processXML a function that provides a high level configuration driven interface to peak util SOX NegotiatingParser This simple front end lets you supply as little as a configuration context and a stream source to do XML processing of arbitrary complexity controlled by the configuration of the context Added config XMLKey an IConfigKey type that can be used to register configuration values for XML attribute and element names under specified XML namespace URI s Also there are now XML Attributes for nsuri and XML Elements for nsuri section types available for use in ini files Replace nsuri with the appropriate XML namespace URI or use for a wildcard web IResource is gone replaced by web IPlace The notion of a place is broader than the notion of a resource and we will soon need to have other location objects that implement IPlace In order to support obtaining the line and column locations of problems in XML files we are now using Python 2 4 s version of the pyexpat module built as peak util pyexpat There s a new class config IniLoader that can be used to lazily load ini files as configuration IniLoader instances have an iniFiles attribute that lists the configuration sources filenames URLs factories to be used and automatically load the ini files as soon as you try to get any configuration data for them Previously similar functionality was only available via config makeRoot Also there s now an ini reference type that instantiates an IniLoader for one or more addresses You can use it like this Named Services some example naming Reference ini pkgfile peak peak ini etc something ini another example naming LinkRef ref ini pkgfile peak peak ini etc something ini The two examples above will each load the same pair of specified ini files You can also directly instantiate an IniLoader as in cfg config IniLoader self iniFiles pkgfile peak peak ini Attempting to look up any configuration properties via the cfg object will cause it to load the specified ini file config fileNearModule is DEPRECATED in favor of config packageFile The latter returns a naming IStreamFactory which is more suitable for working with e g module data files compressed in a zipfile Uses of fileNearModule that were being passed to config loadConfigFile can be safely changed to config packageFile without needing any other code changes but if you were directly using fileNearModule as a filename you will need to rewrite appropriately config loadConfigFile and config loadConfigFiles now accept URLs naming IStreamFactory objects and other config getStreamFactory targets as well as filenames This was primarily added to support use of config packageFile or pkgfile URLs in place of using config fileNearModule The naming IStreamFactory interface now has an address attribute which is the string form of the canonical URL of the target stream This was added to make it easier to e g report errors in a stream that s being parsed since the parser only needs the factory in order to report the location of an error Note if you implement naming IStreamFactory be sure to add this attribute to your implementations The peak util WSGIServer module has been moved to the wsgiref simple server module The wsgiref reference library for WSGI aka PEP 333 is now distributed with PEAK Added a WSGI command to the peak script to allow you to run foreign i e non PEAK PEP 333 applications in PEAK s various servers and launchers Basically by prefixing WSGI before the import specifier you can now run such foreign apps For example peak launch WSGI import some app application will run some app application in the local web browser and peak CGI WSGI import some app application will run it under the CGI FastCGI runner Similarly you can use this in the Command spec for the peak supervise pre forking FastCGI supervisor subsystem There is a new running IWSGIApplication interface for PEP 333 compliant application objects and all of PEAK s provided applications now implement it instead of running IRerunnableCGI If you write your apps to the newer interface they ll be portable to any PEP 333 compliant web server not just the PEAK CGI FastCGI and supervisor containers There is a simple adapter that allows IWSGIApplication objects to run in the CGI based containers but not the other way around so using IRerunnableCGI directly now limits your portability For example the peak launch and peak serve commands will soon require IWSGIApplication and will not support IRerunnableCGI any more Of course if you use the peak web framework you don t need to worry about any of this your apps will automatically be wrapped as IWSGIApplication and run in any PEAK server or gateway Most peak web interfaces have changed significantly If you implemented anything based on the older interfaces and it still works it s sheer bloody luck In particular note that every method in web IWebTraversable now has different inputs and or outputs than before Please read the new interface docs and update your code The changed interfaces offer much more flexibility and functionality than before but they will require you to update your code web ContainerAsTraversable has been removed It was redundant since the new default traversal mechanism used by Traversable and Decorator now handles getitem getattr and views Added Zope 3 like namespaces to peak web Path segments in a

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  • PEAK API Reference
    before The key is component based development on a reliable infrastructure PEAK tools can be used with other Python Enterprise frameworks such as Zope Twisted and the Python DBAPI to construct web based GUI or command line applications interacting with any kind of storage or with no storage at all Whatever the application type PEAK can help you put it together Package Features Far too many to list even briefly here see FEATURES txt for a very high level overview Known Issues and Risks of this Version This is ALPHA software Although much of the system is extensively tested by a battery of automated tests it may contain bugs especially in areas not covered by the test suites Also many system interfaces are still subject to change PEAK includes early copies of Zope X3 s ZConfig and persistence packages which have had and may continue to have significant implementation changes We will be tracking Zope X3 periodically but can t guarantee compatibility with arbitrary e g CVS versions of Zope X3 Documentation at present is limited and scattered The principal documentation is an API reference generated from the code s lengthy docstrings which usually contain motivating examples for using that class method or function The mailing list and its archives provide a wealth of information on actual usage scenarios recommended approaches etc There is also the beginnings of a tutorial on using the component binding package Third Party Software Included with PEAK All third party software included with PEAK are understood by PEAK s authors to be distributable under terms comparable to those PEAK is offered under However it is up to you to understand any obligations those licenses may impose upon you For your reference here are the third party packages and where to find their license terms The

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