Unique compound key for a class

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Author	Message
Arlan Hair	Tuesday 22 November 2005 1:55:09 pm What is the best way of creating a new class that requires a unique compound key. Example <b>Attribute</b>.......Key field Project...........yes Year..............yes MoreInfo..........no where there can only be one object that contains a given Project, Year.
Łukasz Serwatka	Wednesday 23 November 2005 11:40:50 pm Hi Arlan, You can us Identifier datatype as unique attribute, it will be unique around objects created from class which has this attribute. Personal website -> http://serwatka.net Blog (about eZ Publish) -> http://serwatka.net/blog
Arlan Hair	Monday 28 November 2005 7:34:49 am Thanks Lukasz, I need to clarify my request a little more. I am from the relational database era where you can specify a unique key over several fields (attributes) that will be entered by the user. In the example below I do not what to allow the user to add a second record with project=5100, Year=2005. Existing objects Project Year MoreInfo 5100 2003 los lorum... 5200 2003 qwert... 5100 2004 qwert... 5200 2004 qwert... 5100 2005 qwert... My understanding of the Identifier datatype is an auto incremental number surrounded by hard coded text.

Author

Message

Arlan Hair

Tuesday 22 November 2005 1:55:09 pm

What is the best way of creating a new class that requires a unique compound key.

Example
<b>Attribute</b>.......Key field
Project...........yes
Year..............yes
MoreInfo..........no

where there can only be one object that contains a given Project, Year.

Łukasz Serwatka

Wednesday 23 November 2005 11:40:50 pm

Hi Arlan,

You can us Identifier datatype as unique attribute, it will be unique around objects created from class which has this attribute.

Personal website -> http://serwatka.net
Blog (about eZ Publish) -> http://serwatka.net/blog

Arlan Hair

Monday 28 November 2005 7:34:49 am

Thanks Lukasz,
I need to clarify my request a little more. I am from the relational database era where you can specify a unique key over several fields (attributes) that will be entered by the user. In the example below I do not what to allow the user to add a second record with project=5100, Year=2005.
Existing objects
Project Year MoreInfo
5100 2003 los lorum...
5200 2003 qwert...
5100 2004 qwert...
5200 2004 qwert...
5100 2005 qwert...
My understanding of the Identifier datatype is an auto incremental number surrounded by hard coded text.

eZ debug

Timing:	Jan 18 2025 21:03:39
Script start
Timing:	Jan 18 2025 21:03:39
Module start 'layout'
Timing:	Jan 18 2025 21:03:39
Module start 'content'
Timing:	Jan 18 2025 21:03:39
Module end 'content'
Timing:	Jan 18 2025 21:03:39
Script end

Main resources:

Total runtime	0.6088 sec
Peak memory usage	4,096.0000 KB
Database Queries	57

Timing points:

Checkpoint	Start (sec)	Duration (sec)	Memory at start (KB)	Memory used (KB)
Script start	0.0000	0.0067	587.9063	152.6250
Module start 'layout'	0.0067	0.0043	740.5313	39.4453
Module start 'content'	0.0110	0.5966	779.9766	535.9688
Module end 'content'	0.6076	0.0012	1,315.9453	8.1641
Script end	0.6088		1,324.1094

Time accumulators:

Accumulator	Duration (sec)	Duration (%)	Count	Average (sec)
Ini load
Load cache	0.0034	0.5564	16	0.0002
Check MTime	0.0013	0.2189	16	0.0001
Mysql Total
Database connection	0.0009	0.1493	1	0.0009
Mysqli_queries	0.5614	92.2146	57	0.0098
Looping result	0.0007	0.1160	55	0.0000
Template Total	0.5745	94.4	2	0.2873
Template load	0.0022	0.3653	2	0.0011
Template processing	0.5723	94.0054	2	0.2862
Template load and register function	0.0002	0.0358	1	0.0002
states
state_id_array	0.0024	0.3898	1	0.0024
state_identifier_array	0.0010	0.1652	2	0.0005
Override
Cache load	0.0018	0.2961	25	0.0001
Sytem overhead
Fetch class attribute can translate value	0.0005	0.0846	2	0.0003
Fetch class attribute name	0.0013	0.2173	4	0.0003
XML
Image XML parsing	0.0006	0.1025	2	0.0003
class_abstraction
Instantiating content class attribute	0.0000	0.0016	4	0.0000
General
dbfile	0.0007	0.1176	18	0.0000
String conversion	0.0000	0.0018	4	0.0000
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Usage	Requested template	Template	Template loaded
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3	content/datatype/view/ezxmltext.tpl	<No override>	extension/community_design/design/suncana/templates/content/datatype/view/ezxmltext.tpl
4	content/datatype/view/ezxmltags/paragraph.tpl	<No override>	extension/ezwebin/design/ezwebin/templates/content/datatype/view/ezxmltags/paragraph.tpl
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1	print_pagelayout.tpl	<No override>	extension/community/design/community/templates/print_pagelayout.tpl
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Time used to render debug report: 0.0001 secs