Re: [Zope-dev] ZCatalog Lazy Results
Casey Duncan [EMAIL PROTECTED] wrote: Yes, you always get all the meta-data. However, does anyone know how the "used" argument of ZCatalog.searchResults works, or why you would use it? 'used' tells you the names of the indexes which actually participated in the search (as distinct from those you asked for). What does this meen? Example, What's the different between: searchResults(used=(index1,index2), index1='kalle', index2='kaviar') and; searchResults(index1='kalle', index2='kaviar') (Are used supposed to be a tuple?) TIA, Johan Carlsson ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] ZCatalog Lazy Results
On Thu, 22 Feb 2001, Johan Carlsson wrote:
Casey Duncan [EMAIL PROTECTED] wrote:
Yes, you always get all the meta-data. However, does
anyone know how the "used" argument of
ZCatalog.searchResults works, or why you would use it?
'used' tells you the names of the indexes which actually
participated in the search (as distinct from those you
asked for).
What does this meen?
Example, What's the different between:
searchResults(used=(index1,index2), index1='kalle', index2='kaviar')
and;
searchResults(index1='kalle', index2='kaviar')
There is no practical difference, unless you are "federating"
queries across multiple catalogs; the 'used' parameter is there
solely to accumulate a record of the indices used in the search.
(Are used supposed to be a tuple?)
It should be something supporting the mapping interface. Here is
how it is used (from 'lib/python/Products/ZCatalog/Catalog.py'):
if used is None: used={}
for i in self.indexes.keys():
try:
index = self.indexes[i].__of__(self)
if hasattr(index,'_apply_index'):
r=index._apply_index(args)
if r is not None:
r, u = r
for name in u:
used[name]=1
In other words, "Nothing to see here; move along." :)
Tres.
--
===
Tres Seaver[EMAIL PROTECTED]
Digital Creations "Zope Dealers" http://www.zope.org
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Re: [Zope-dev] ZCatalog Lazy Results
Tres Seaver writes: 'getObject' forces you to "wake up" the catalogued object; in a large enough result set, the price is pretty punitive, compared to serving the results as cached metadata. You can batch large result sets: "getObject" would just be applied to the objects in the batch. The objects are cached, too (ZODB cache). Dieter ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
Re: [Zope-dev] ZCatalog Lazy Results
--- Johan Carlsson [EMAIL PROTECTED] wrote:
Hi,
I need to check an assumption I have made on the
ZCatalog Brains and Lazy Results from reading the
source.
1. The Brains gets its schema from the ZCatalog and
this
schema is basicly fixed. E.g. a search result
always has
the attributes defined by the Meta Data in the
ZCatalog?
Yes, you always get all the meta-data. However, does
anyone know how the "used" argument of
ZCatalog.searchResults works, or why you would use it?
I would rather be able to construct a Brain Schema
at search time
equivalent to the way theSELECT statement sets up
the result attributes
in SQL.
Example:
resultset =
Catalog.searchResults(query,schema=('id','title','keywords'))
Why is this important? I would suggest not putting big
stuff in the meta-data that might warrant this. Just
use the nifty new (v2.3) getObject method of the brain
to access whatever properties/methods of the actual
object you might need.
2. The laziness of the ZCatalog search result means
it's batched?
Lazy sequences work by not loading the result items in
memory until they are actually accessed.
Regards,
Johan Carlsson
=
| Casey Duncan
| Kaivo, Inc.
| [EMAIL PROTECTED]
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Re: [Zope-dev] ZCatalog Lazy Results
I would rather be able to construct a Brain Schema
at search time
equivalent to the way theSELECT statement sets up
the result attributes
in SQL.
Example:
resultset =
Catalog.searchResults(query,schema=('id','title','keywords'))
Why is this important? I would suggest not putting big
stuff in the meta-data that might warrant this. Just
use the nifty new (v2.3) getObject method of the brain
to access whatever properties/methods of the actual
object you might need.
If I have allot of MetaDatas and do allot of searches,
one for each page hit, I assume it would use up allot of
memory and do allot of copying of attributes?
I want to use ZCatalog for dynamic linking.
2. The laziness of the ZCatalog search result means
it's batched?
Lazy sequences work by not loading the result items in
memory until they are actually accessed.
Ok, suppose I should have known that. Thanks.
Johan
zYbh:)zib3j)fjb?^uh(t-j+-ml^?+-w:)yzml^?+-w:)
Re: [Zope-dev] ZCatalog Lazy Results
How many is "a lot" of meta datas?
At least 20-30.
Johan
Catalog.searchResults(query,schema=('id','title','keywords'))
Why is this important? I would suggest not putting
big
stuff in the meta-data that might warrant this.
Just
use the nifty new (v2.3) getObject method of the
brain
to access whatever properties/methods of the
actual
object you might need.
If I have allot of MetaDatas and do allot of
searches,
one for each page hit, I assume it would use up
allot of
memory and do allot of copying of attributes?
I want to use ZCatalog for dynamic linking.
2. The laziness of the ZCatalog search result
means
it's batched?
Lazy sequences work by not loading the result
items in
memory until they are actually accessed.
Ok, suppose I should have known that. Thanks.
Johan
hfX)x7^!X+Yb~zhr,,+ 3 zw(v)EZelib3j)fjb?^jyw ib3j)fjb?^
