Implementation for Resultset interface

Hi,
We are developing a JCA adapter where we have to implement the java.sql.ResultSet Interface as per the JDBC 3.0 Spec.I want to know ho the values retrieved from database are stored into the ResultSet by the JDBC Drivers.Can i get a sample source code for this implementation.I am connecting to database with a native C code and the C code is returning the result in a data structure ex Map.I want to set this result in a ResultSet before returning it to the client.
And I have the mySQL JDBC Driver implementation source code with me and as per our requirement its not complete. So anyone can shed som light on this.
regards
K.Sreenivas

know ho the values retrieved from database are stored into the ResultSet by the JDBC DriversHowever you want. All it is an interface, so you can do it however you want.
I don't know of any examples that store it 'in' the ResultSet. They all use the underlying protocol to 'store' it.
You can get the jdbc-odbc bridge source comes with the jdk source (at the JDC site.)
The RmiJdbc proxy comes with source - http://www.objectweb.org/
The freetds driver has source - www.freetds.org

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Where are the implementations for some interfaces in the search_sdk.jar?

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Message was edited by:
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Source code is not available. The javadoc is distributed with the installation media. On my machine I can find the javadoc for DocumentMetadata here:
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Dear all,
I had these two questions ringing since a long time.
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Sarvananda wrote:
In the MySQL driver for example it's implemented in com.mysql.jdbc.ResultSet Right. Now it makes sense to me. Every single db that gives me a driver will have their specific implementation for the interface methods of ResultSet.
>
why do you need that?
..Thats a design decision
One of my friends asked me this and I was caught unawares. Any ideas on what factors could have made this design decision ?
Rgds
>
In the MySQL driver for example it's implemented in com.mysql.jdbc.ResultSet Right. Now it makes sense to me. Every single db that gives me a driver will have their specific implementation for the interface methods of ResultSet.
>
why do you need that?
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One of my friends asked me this and I was caught unawares. Any ideas on what factors could have made this design decision ?
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No Implementing class registered for the Interface : ES-TransportationOrderSCMExecutionRequest_In

Dear PI Experts,
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Hi JP,
you can also refer the below wiki and blog
Step-by-step FTP to ABAP Proxy - Process Integration - SCN Wiki
ABAP Proxy Protocols: Use Cases and Examples
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Hi Chaitanya,
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No implementing class registered for the interface

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Regards
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i tried following solution also from old messages in SDN -
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<b>Hi
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Component
Release
SP-Level
Support Package
Short description of comment
SAP_BASIS
740
4
SAPKB74004
SAP Basis Component
SAP_ABA
740
4
SAPKA74004
Cross-Application Component
SAP_GWFND
740
6
SAPK-74006INSAPGWFND
SAP Gateway Foundation
SAP_UI
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SAPK-74007INSAPUI
User Interface Technology
PI_BASIS
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SAPK-74004INPIBASIS
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ST-PI
2008_1_700
8
SAPKITLRD8
SAP Solution Tools Plug-In
SAP_BW
740
4
SAPKW74004
SAP Business Warehouse
IW_PGW
100
5
SAPK-10005INIWPGW
Process Gateway
MDG_FND
747
2
SAPK-74702INMDGFND
MDG Foundation
SAP_AP
700
30
SAPKNA7030
SAP Application Platform
SAP_BS_FND
747
2
SAPK-74702INSAPBSFND
SAP Business Suite Foundation
WEBCUIF
747
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SAPK-74702INWEBCUIF
SAP Web UI Framework
MDG_APPL
617
2
SAPK-61702INMDGAPPL
MDG Applications
SAP_APPL
617
2
SAPKH61702
Logistics and Accounting
SAP_FIN
617
2
SAPK-61702INSAPFIN
SAP_FIN
SAP_HR
604
66
SAPKE60466
Human Resources
SAP_HRCAR
604
66
SAPK-60466INSAPHRCAR
Sub component SAP_HRCAR of SAP_HR
SAP_HRCAT
604
66
SAPK-60466INSAPHRCAT
Sub component SAP_HRCAT of SAP_HR
SAP_HRCAU
604
66
SAPK-60466INSAPHRCAU
Sub component SAP_HRCAU of SAP_HR
SAP_HRCBE
604
66
SAPK-60466INSAPHRCBE
Sub component SAP_HRCBE of SAP_HR
SAP_HRCBR
604
66
SAPK-60466INSAPHRCBR
Sub component SAP_HRCBR of SAP_HR
SAP_HRCCA
604
66
SAPK-60466INSAPHRCCA
Sub component SAP_HRCCA of SAP_HR
SAP_HRCCH
604
66
SAPK-60466INSAPHRCCH
Sub component SAP_HRCCH of SAP_HR
SAP_HRCCL
604
66
SAPK-60466INSAPHRCCL
Sub component SAP_HRCCL of SAP_HR
SAP_HRCCN
604
66
SAPK-60466INSAPHRCCN
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SAP_HRCDE
604
66
SAPK-60466INSAPHRCDE
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SAP_HRCDK
604
66
SAPK-60466INSAPHRCDK
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SAP_HRCES
604
66
SAPK-60466INSAPHRCES
Sub component SAP_HRCES of SAP_HR
SAP_HRCFI
604
66
SAPK-60466INSAPHRCFI
Sub component SAP_HRCFI of SAP_HR
SAP_HRCFR
604
66
SAPK-60466INSAPHRCFR
Sub component SAP_HRCFR of SAP_HR
SAP_HRCGB
604
66
SAPK-60466INSAPHRCGB
Sub component SAP_HRCGB of SAP_HR
SAP_HRCHK
604
66
SAPK-60466INSAPHRCHK
Sub component SAP_HRCHK of SAP_HR
SAP_HRCID
604
66
SAPK-60466INSAPHRCID
Sub component SAP_HRCID of SAP_HR
SAP_HRCIE
604
66
SAPK-60466INSAPHRCIE
Sub component SAP_HRCIE of SAP_HR
SAP_HRCIN
604
66
SAPK-60466INSAPHRCIN
Sub component SAP_HRCIN of SAP_HR
SAP_HRCIT
604
66
SAPK-60466INSAPHRCIT
Sub component SAP_HRCIT of SAP_HR
SAP_HRCJP
604
66
SAPK-60466INSAPHRCJP
Sub component SAP_HRCJP of SAP_HR
SAP_HRCKR
604
66
SAPK-60466INSAPHRCKR
Sub component SAP_HRCKR of SAP_HR
SAP_HRCKW
604
66
SAPK-60466INSAPHRCKW
Sub component SAP_HRCKW of SAP_HR
SAP_HRCMX
604
66
SAPK-60466INSAPHRCMX
Sub component SAP_HRCMX of SAP_HR
SAP_HRCMY
604
66
SAPK-60466INSAPHRCMY
Sub component SAP_HRCMY of SAP_HR
SAP_HRCNL
604
66
SAPK-60466INSAPHRCNL
Sub component SAP_HRCNL of SAP_HR
SAP_HRCNO
604
66
SAPK-60466INSAPHRCNO
Sub component SAP_HRCNO of SAP_HR
SAP_HRCNZ
604
66
SAPK-60466INSAPHRCNZ
Sub component SAP_HRCNZ of SAP_HR
SAP_HRCPH
604
66
SAPK-60466INSAPHRCPH
Sub component SAP_HRCPH of SAP_HR
SAP_HRCPT
604
66
SAPK-60466INSAPHRCPT
Sub component SAP_HRCPT of SAP_HR
SAP_HRCQA
604
66
SAPK-60466INSAPHRCQA
Sub component SAP_HRCQA of SAP_HR
SAP_HRCRU
604
66
SAPK-60466INSAPHRCRU
Sub component SAP_HRCRU of SAP_HR
SAP_HRCSE
604
66
SAPK-60466INSAPHRCSE
Sub component SAP_HRCSE of SAP_HR
SAP_HRCSG
604
66
SAPK-60466INSAPHRCSG
Sub component SAP_HRCSG of SAP_HR
SAP_HRCTH
604
66
SAPK-60466INSAPHRCTH
Sub component SAP_HRCTH of SAP_HR
SAP_HRCTW
604
66
SAPK-60466INSAPHRCTW
Sub component SAP_HRCTW of SAP_HR
SAP_HRCUN
604
66
SAPK-60466INSAPHRCUN
Sub component SAP_HRCUN of SAP_HR
SAP_HRCUS
604
66
SAPK-60466INSAPHRCUS
Sub component SAP_HRCUS of SAP_HR
SAP_HRCVE
604
66
SAPK-60466INSAPHRCVE
Sub component SAP_HRCVE of SAP_HR
SAP_HRCZA
604
66
SAPK-60466INSAPHRCZA
Sub component SAP_HRCZA of SAP_HR
SAP_HRGXX
604
66
SAPK-60466INSAPHRGXX
Sub component SAP_HRGXX of SAP_HR
SAP_HRRXX
604
66
SAPK-60466INSAPHRRXX
Sub component SAP_HRRXX of SAP_HR
EA-IPPE
400
24
SAPKGPID24
SAP iPPE
EA-APPL
617
2
SAPK-61702INEAAPPL
SAP Enterprise Extension PLM, SCM, Financials
EA-DFPS
600
24
SAPKGPDD24
SAP Enterprise Extension Defense Forces & Public Security
EA-FIN
617
2
SAPK-61702INEAFIN
EA-FIN
EA-FINSERV
600
25
SAPKGPFD25
SAP Enterprise Extension Financial Services
EA-GLTRADE
600
24
SAPKGPGD24
SAP Enterprise Extension Global Trade
EA-HR
607
17
SAPK-60717INEAHR
SAP Enterprise Extension HR
EA-HRCAR
607
17
SAPK-60717INEAHRCAR
Sub component EA-HRCAR of EA-HR
EA-HRCAT
607
17
SAPK-60717INEAHRCAT
Sub component EA-HRCAT of EA-HR
EA-HRCAU
607
17
SAPK-60717INEAHRCAU
Sub component EA-HRCAU of EA-HR
EA-HRCBE
607
17
SAPK-60717INEAHRCBE
Sub component EA-HRCBE of EA-HR
EA-HRCBR
607
17
SAPK-60717INEAHRCBR
Sub component EA-HRCBR of EA-HR
EA-HRCCA
607
17
SAPK-60717INEAHRCCA
Sub component EA-HRCCA of EA-HR
EA-HRCCH
607
17
SAPK-60717INEAHRCCH
Sub component EA-HRCCH of EA-HR
EA-HRCCL
607
17
SAPK-60717INEAHRCCL
Sub component EA-HRCCL of EA-HR
EA-HRCCN
607
17
SAPK-60717INEAHRCCN
Sub component EA-HRCCN of EA-HR
EA-HRCDE
607
17
SAPK-60717INEAHRCDE
Sub component EA-HRCDE of EA-HR
EA-HRCDK
607
17
SAPK-60717INEAHRCDK
Sub component EA-HRCDK of EA-HR
EA-HRCES
607
17
SAPK-60717INEAHRCES
Sub component EA-HRCES of EA-HR
EA-HRCFI
607
17
SAPK-60717INEAHRCFI
Sub component EA-HRCFI of EA-HR
EA-HRCFR
607
17
SAPK-60717INEAHRCFR
Sub component EA-HRCFR of EA-HR
EA-HRCGB
607
17
SAPK-60717INEAHRCGB
Sub component EA-HRCGB of EA-HR
EA-HRCHK
607
17
SAPK-60717INEAHRCHK
Sub component EA-HRCHK of EA-HR
EA-HRCID
607
17
SAPK-60717INEAHRCID
Sub component EA-HRCID of EA-HR
EA-HRCIE
607
17
SAPK-60717INEAHRCIE
Sub component EA-HRCIE of EA-HR
EA-HRCIN
607
17
SAPK-60717INEAHRCIN
Sub component EA-HRCIN of EA-HR
EA-HRCIT
607
17
SAPK-60717INEAHRCIT
Sub component EA-HRCIT of EA-HR
EA-HRCJP
607
17
SAPK-60717INEAHRCJP
Sub component EA-HRCJP of EA-HR
EA-HRCKR
607
17
SAPK-60717INEAHRCKR
Sub component EA-HRCKR of EA-HR
EA-HRCKW
607
17
SAPK-60717INEAHRCKW
Sub component EA-HRCKW of EA-HR
EA-HRCMX
607
17
SAPK-60717INEAHRCMX
Sub component EA-HRCMX of EA-HR
EA-HRCMY
607
17
SAPK-60717INEAHRCMY
Sub component EA-HRCMY of EA-HR
EA-HRCNL
607
17
SAPK-60717INEAHRCNL
Sub component EA-HRCNL of EA-HR
EA-HRCNO
607
17
SAPK-60717INEAHRCNO
Sub component EA-HRCNO of EA-HR
EA-HRCNZ
607
17
SAPK-60717INEAHRCNZ
Sub component EA-HRCNZ of EA-HR
EA-HRCPH
607
17
SAPK-60717INEAHRCPH
Sub component EA-HRCPH of EA-HR
EA-HRCPT
607
17
SAPK-60717INEAHRCPT
Sub component EA-HRCPT of EA-HR
EA-HRCQA
607
17
SAPK-60717INEAHRCQA
Sub component EA-HRCQA of EA-HR
EA-HRCRU
607
17
SAPK-60717INEAHRCRU
Sub component EA-HRCRU of EA-HR
EA-HRCSE
607
17
SAPK-60717INEAHRCSE
Sub component EA-HRCSE of EA-HR
EA-HRCSG
607
17
SAPK-60717INEAHRCSG
Sub component EA-HRCSG of EA-HR
EA-HRCTH
607
17
SAPK-60717INEAHRCTH
Sub component EA-HRCTH of EA-HR
EA-HRCTW
607
17
SAPK-60717INEAHRCTW
Sub component EA-HRCTW of EA-HR
EA-HRCUN
607
17
SAPK-60717INEAHRCUN
Sub component EA-HRCUN of EA-HR
EA-HRCUS
607
17
SAPK-60717INEAHRCUS
Sub component EA-HRCUS of EA-HR
EA-HRCVE
607
17
SAPK-60717INEAHRCVE
Sub component EA-HRCVE of EA-HR
EA-HRCZA
607
17
SAPK-60717INEAHRCZA
Sub component EA-HRCZA of EA-HR
EA-HRGXX
607
17
SAPK-60717INEAHRGXX
Sub component EA-HRGXX of EA-HR
EA-HRRXX
607
17
SAPK-60717INEAHRRXX
Sub component EA-HRRXX of EA-HR
EA-PS
600
24
SAPKGPPD24
SAP Enterprise Extension Public Services
EA-RETAIL
600
24
SAPKGPRD24
SAP Enterprise Extension Retail
FINBASIS
600
24
SAPK-60024INFINBASIS
Fin. Basis
ECC-DIMP
600
23
SAPK-60023INECCDIMP
DIMP
ERECRUIT
600
24
SAPK-60024INERECRUIT
E-Recruiting
FI-CA
600
23
SAPK-60023INFICA
FI-CA
FI-CAX
600
23
SAPK-60023INFICAX
FI-CA Extended
HR-CEE
110_604
52
SAPK-60452INHRCEE
HR country version for CEE countries
HR-CEECBG
110_604
52
SAPK-60452INHRCEECBG
Sub component HR-CEECBG of HR-CEE
HR-CEECCO
110_604
52
SAPK-60452INHRCEECCO
Sub component HR-CEECCO of HR-CEE
HR-CEECCZ
110_604
52
SAPK-60452INHRCEECCZ
Sub component HR-CEECCZ of HR-CEE
HR-CEECGR
110_604
52
SAPK-60452INHRCEECGR
Sub component HR-CEECGR of HR-CEE
HR-CEECHR
110_604
52
SAPK-60452INHRCEECHR
Sub component HR-CEECHR of HR-CEE
HR-CEECHU
110_604
52
SAPK-60452INHRCEECHU
Sub component HR-CEECHU of HR-CEE
HR-CEECPL
110_604
52
SAPK-60452INHRCEECPL
Sub component HR-CEECPL of HR-CEE
HR-CEECRO
110_604
52
SAPK-60452INHRCEECRO
Sub component HR-CEECRO of HR-CEE
HR-CEECSI
110_604
52
SAPK-60452INHRCEECSI
Sub component HR-CEECSI of HR-CEE
HR-CEECSK
110_604
52
SAPK-60452INHRCEECSK
Sub component HR-CEECSK of HR-CEE
HR-CEECTR
110_604
52
SAPK-60452INHRCEECTR
Sub component HR-CEECTR of HR-CEE
HR-CEECUA
110_604
52
SAPK-60452INHRCEECUA
Sub component HR-CEECUA of HR-CEE
HR-CEEGXX
110_604
0
Sub component HR-CEEGXX of HR-CEE
HR-CEERXX
110_604
0
Sub component HR-CEERXX of HR-CEE
INSURANCE
600
23
SAPK-60023ININSURANC
SAP Insurance
IS-CWM
600
23
SAPK-60023INISCWM
Industry Solution Catch Weight Management
IS-H
600
34
SAPK-60034INISH
SAP Healthcare
IS-M
600
23
SAPK-60023INISM
SAP MEDIA
IS-OIL
600
23
SAPK-60023INISOIL
IS-OIL
IS-PS-CA
600
23
SAPK-60023INISPSCA
IS-PUBLIC SECTOR CONTRACT ACCOUNTING
IS-UT
600
23
SAPK-60023INISUT
SAP Utilities/Telecommunication
LSOFE
600
24
SAPK-60024INLSOFE
SAP Learning Solution Front-End
SEM-BW
600
24
SAPKGS6024
SEM-BW: Strategic Enterprise Management
GBAPP002
600
4
SAPK-60004INGBAPP002
GBAPP002
GBHCM002
600
11
SAPK-60011INGBHCM002
HCM Employee Requests (Leave)
GBHCM003
600
9
SAPK-60009INGBHCM003
HCM Manager Approvals (Time, Training, L
SRA002
600
3
SAPK-60003INSRA002
Time Recording OData Integration Compone
SRA010
600
3
SAPK-60003INSRA010
Staffing List OData Integration Componen
SRA017
600
3
SAPK-60003INSRA017
Create Purchase Order OData Integration
SRA018
600
3
SAPK-60003INSRA018
Purchase Order Status Tracking OData Int
UIAPP001
100
4
SAPK-10004INUIAPP001
UIAPP001 100: Add-On Installation
UIAPP002
100
3
SAPK-10003INUIAPP002
UIAPP002 100: Add-On Installation
UIGIB001
100
4
SAPK-10004INUIGIB001
UIGIB001 100: Add-On Installation
UIHCM002
100
4
SAPK-10004INUIHCM002
UIHCM002 100: Add-On Installation
UIHCM003
100
4
SAPK-10004INUIHCM003
UIHCM003 100: Add-On Installation
UISRA002
100
3
SAPK-10003INUISRA002
HTML5 Time Recording
UISRA010
100
3
SAPK-10003INUISRA010
HTML5 Staffing List
UISRA017
100
3
SAPK-10003INUISRA017
HTML5 Create Order
UISRA018
100
3
SAPK-10003INUISRA018
HTML5 Order Status Tracking
please help me to resolve that issue
Regards
Pankaj Kamble

Hi Team,
i have created new post.
SAP Fiori getting error message Check the URL parameters and the scenario definition. To check the scenario definition.
Scenario definition configuration screen short.
2) Also getting bellow error message
Property TaskDefinitionID not found in type WorkflowTask
Did not find error details
{"error":{"code":"005056A509B11EE1B9A8FEA8DE87F78E","message":{"lang":"en","value":"Property TaskDefinitionID not found in type WorkflowTask"},"innererror":{"transactionid":"E6A9CEE388D3F1EC940400155DC8D41B","timestamp":"20140428075136.7780000","Error_Resolution":{"SAP_Transaction":"Run transaction /IWFND/ERROR_LOG on SAP NW Gateway hub system and search for entries with the timestamp above for more details","SAP_Note":"See SAP Note 1797736 for error analysis (https://service.sap.com/sap/support/notes/1797736)"}}}}
Regards
Pankaj Kamble

How to use Start Task Group for Workflow Interface

Hi all,
anyone who can tell me how to use the Interface IFWFTSKGRP (Start Task Group for Workflow Interface)?
As far as I understood the documentation it can be used to restrict the selection of workflows that can be started in the Generic Object Services. But the question is how to implement it.
Best regards,
Carsten
Edited by: Carsten Drewes on Jun 10, 2009 10:30 AM

Hi, Carsten,
(probably it's a bit too late to post an answer after 3 years , but I'll post it in case someone else needs it)
You should implement GetTaskGroup method.
The code should return id of the task group (otype TG, mantained in PFTC) that holds the list of workflow definitions.
Here is a sample implementation. It's taken from FORMABSENC business object. It belongs to SAP demo workflow "Notification of Absence". I suppose it should be present in most systems and you can see it in action.
begin_method gettaskgroup changing container.
DATA: taskgroup LIKE rhobjects-object.
*- set task group
taskgroup = 'TG70000023'.
*- set result
swc_set_element container result taskgroup.
end_method.

When we will go for an abstract class and when we will go for an interface?

it's always some what confusing to choose an abstract class and an interface,can anybody post a suitable answer for this.

jwenting wrote:
with experience and the insight it brings, you will know which to use when.
Without it, it can't be explained.
More often than not there's no X OR Y anyway.It's fortunate that there are posters here who possess the insight and experience necessary to explain this. The principal differences between an abstract class and an interface are,
1. An abstract class can carry implementation, whereas an interface cannot.
2. An abstract class is singly inherited, wheras an interface is multiply inherited.
So use an abstract class when the implementation it can carry outweights the fact that it cannot be multiply inherited That's the gist of it.
The inheritance relationship where this happens is when the supertype is a general concept of which all potential subtypes are special cases. This is called a specialization (or sometimes a generalization) relationship. For example Apple and Banana are Fruit. Or Car and Bike are Vechicle. The Fruit and Vechicle supertypes are general concepts of which their subtypes are special cases. In this case make Fruit and Vechicle abstract classes because the subtypes will benefit from a shared implementation.
If you don't have a clearcut specialization/generalization relationship make the supertype an interface. An example could be the Comparable supertype. The potential subtypes aren't supposed to be specializations of the Comparable concept, they're suppose to become Comparable (and make this property an integral part of their being). This is not a specialization/generalization relationship. Instead the supertype is intended to add character to the subtypes. The subtypes are unlikely to benefit from an inherited implementation. So make Comparable an interface.

Configuring Kodo default implementation for field of Collection type

If I am not mistaken default implementation for field of Collection type in
Kodo is
LinkedList based proxy. It would be great if it were possible to configure
Kodo to use a proxy of my choosing
I did some tests and it seems to me that ArrayList is much more efficient
than Linked list (see below)
Is there any specific reason I am not aware of that makes LinkedList better
than array list
In my applications all collections a relatively small (or at least most of
my collections are definitely small)
and since I use Collection interface there is no inserts into middle of my
collections - only appends (which ArrayList handles very well)
So my question is can I make Kodo to use ArrayListProxy for fields of
Collection type
(except of course using ArrayList field instead of Collection which I do not
want to do)
below is some statistics on collection performance (populating and iterating
collections)
the same test against 3 collections implementations (JDK 1.4.1)
Not only ArrayList by far the fastest and memory friendly it also garbage
collected much sooner and better -
I show here max memory consumption and last to would not be garbage
collected till all memory is in use (old generation GC)
and ArrayList seems to be collected by young gen GC because it was collected
very quickly between test cycles why other only when all memory was used
So please make ArrayList your default collection implementation :-)
Small collection size (40)
time(ms) memory(kb)
ArrayList 5,218 62,154
LinkedList 14,125 240,066
HashSet 27,000 311,825
the same but using using random inserts - append(index, object) rather than
append(object):
ArrayList 8937, 53591
LinkedList 15047, 240066
Larger collection size (200)
ArrayList 4860, 47709
LinkedList 18468, 290704
HashSet 34391, 422282
the same but using using random inserts - append(index, object) rather than
append(object):
ArrayList 11844, 47709
LinkedList 25766, 290704

You should be able to accomplish this fairly easily by extending
SimpleProxyManager:
http://solarmetric.com/Software/Documentation/2.4.3/docs/javadoc/com/solarmetric/kodo/util/SimpleProxyManager.html
and overriding the appropriate methods (getCollectionCopy and
getCollectionProxy).
On Mon, 12 May 2003 12:26:21 -0400, Alex Roytman wrote:
If I am not mistaken default implementation for field of Collection type in
Kodo is
LinkedList based proxy. It would be great if it were possible to configure
Kodo to use a proxy of my choosing
I did some tests and it seems to me that ArrayList is much more efficient
than Linked list (see below)
Is there any specific reason I am not aware of that makes LinkedList better
than array list
In my applications all collections a relatively small (or at least most of
my collections are definitely small)
and since I use Collection interface there is no inserts into middle of my
collections - only appends (which ArrayList handles very well)
So my question is can I make Kodo to use ArrayListProxy for fields of
Collection type
(except of course using ArrayList field instead of Collection which I do not
want to do)
below is some statistics on collection performance (populating and iterating
collections)
the same test against 3 collections implementations (JDK 1.4.1)
Not only ArrayList by far the fastest and memory friendly it also garbage
collected much sooner and better -
I show here max memory consumption and last to would not be garbage
collected till all memory is in use (old generation GC)
and ArrayList seems to be collected by young gen GC because it was collected
very quickly between test cycles why other only when all memory was used
So please make ArrayList your default collection implementation :-)
Small collection size (40)
time(ms) memory(kb)
ArrayList 5,218 62,154
LinkedList 14,125 240,066
HashSet 27,000 311,825
the same but using using random inserts - append(index, object) rather than
append(object):
ArrayList 8937, 53591
LinkedList 15047, 240066
Larger collection size (200)
ArrayList 4860, 47709
LinkedList 18468, 290704
HashSet 34391, 422282
the same but using using random inserts - append(index, object) rather than
append(object):
ArrayList 11844, 47709
LinkedList 25766, 290704

Exception "not implemented for class oracle.jdbc.driver.T4CNumberAccessor"

Hello I'm having some troubles dealing with 'java.sql.Date' I'm working with express edition database and I have three classes(different packages)
1.Mapper
2.Objects Class
3.ConsoleTest
I need to get an arraylist of objects, some of which contain dates, but when try to do it I get this exception
"java.sql.SQLException: Invalid column type: getDate not implemented for class oracle.jdbc.driver.T4CNumberAccessor"
Do you have any idea how I can implement the getDate method for this T4CNumberAccessor
Here are the methods that I'm using
1.Mapper
public ArrayList<Object> getAllTaskAuctions(Connection con)
          ArrayList<Object> l1 = new ArrayList<Object>();
          String SQLString1 = "select * from taskauction natural join tasks";
PreparedStatement statement=null;
try
//=== get taskauctions natural join tasks
statement = con.prepareStatement(SQLString1);
ResultSet rs = statement.executeQuery();
while(rs.next())
l1.add(new TaskAuction(rs.getInt(1), rs.getInt(2), rs.getInt(3),
rs.getDate(4), rs.getDate(5), rs.getInt(6)));
l1.add(new Task(rs.getInt(1), rs.getInt(2), rs.getString(3),
rs.getString(4), rs.getString(5), rs.getString(6), rs.getInt(7)));
catch (Exception exc)
System.out.println("Fail in TaskAuctionMapper - getAllTaskAuctions");
System.out.println(exc);
return l1;
2.ConsoleTest class
Connection con;
     public Connection getConnection(){
          try{
     Class.forName("oracle.jdbc.driver.OracleDriver");
     con = DriverManager.getConnection(
     "jdbc:oracle:thin:@localhost:1521:XE", "Project", "123" );
     //username/password@[/]host[:port][service_name]
     catch (Exception e)
     {   System.out.println("fail in getConnection()");
     System.out.println(e); }
          return con;
     public static void main(String[] args) {
          ConsoleTest ct = new ConsoleTest();
          TaskAuctionMapper tam1 = new TaskAuctionMapper();
ArrayList<Object> alt1 = tam1.getAllTaskAuctions(ct.getConnection());
Iterator<Object> itr1 = alt1.iterator();
while (itr1.hasNext())
TaskAuction taskauct = (TaskAuction) itr1.next();
//Problem, exception traced to TaskAuctionMapper
System.out.println(
          "Task ID: " + taskauct.getTaskid()+ ", "+
          "StartDate: "+ taskauct.getStartdate()+", "+
          "User ID: " + taskauct.getUserid());
     }

Found the answer, I shouldn't use integers as parameters of column index in the result set, but instead use String to mark the fields :)

Implementation for Resultset interface

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