Cascade update on tables

Hi,
I know that oracle apps coding standard prohibits cascade delete feature in the database. Hence it should be implemented at application level.
However my question is regarding cascade update. Need is to update the header's WHO columns, when an update is made to any of the lines. Both the tables are custom tables. I was thinking to write a trigger, instead of putting this logic in application.
What should be the better solution and why? Writing trigger or implementing this functionality in application (OAF).
Abdul Wahid

Hi Sandeep.
Thanks for the answer.
However its still half.
Answer is considering putting the logic at application level,fine. but why?
Question is about its benefits over putting the trigger on the lines table.
Why I am favouring trigger is due to following reasons..
1. Lesser maintenance. (Just one trigger, no code jungle)
2. Update of header with line' WHO is always expected (from application or any concurrent program)
3. And putting things in application, brings challenge of maintaining integrity constrains....
This third point is main reason I am seeing behind oracle's statndard for cascade delete, cause they are seeded tables and putting a trigger on header table may delete lines rows always (Very specific to that screen), which may not be desirable in a lot cases.Huge integrity risk.
This case is of update desirable always, where I am seeing using trigger as help to maintain integrity, instead of risk to integrity.
Is there any doc about such situation( coding and design guidelines). I searched net and metalink, but yet did not find.
(my application is OAF, and its implemented also by the grace of Allah.)
Abdul Wahid

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How to cascade update

how to cascade update?

Sorry everyone for going regional with my Mexican fiend!
In MEXMAN's first case, integrity on related data was already being enforced through a valid foreign key (TIZAYUCA.REGLAFAB_PRODUCTO_FK). However, the user wanted to update data included in the foreign key relationship. To acomplish this, I recommended to change the actual constraint state to defer validation until commit. Using the now familiar column names, the sentences are:
ALTER TABLE TIZAYUCA.REGLA_FABRICACION
DROP CONSTRAINT REGLAFAB_PRODUCTO_FK;
ALTER TABLE TIZAYUCA.REGLA_FABRICACION
ADD CONSTRAINT REGLAFAB_PRODUCTO_FK FOREIGN KEY (GRUPO, PRODUCTO)
REFERENCES TIZAYUCA.PRODUCTO (GRUPO, CLAVE)
INITIALLY DEFERRED;
In MEXMAN's second case, a wholly new integrity needs to be enforced between two tables but some actual data present in both tables do not validate the desired constraint. The offending rows from the child table (TIZAYUCA.PRESENTACION) may be obtained executing
SELECT *
FROM tizayuca.presentacion t
WHERE (t.grupo, t.producto) NOT IN
(SELECT p.grupo, p.clave
FROM tizayuca.producto p);
MEXMAN has 3 choices:
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alter table TIZAYUCA.PRESENTACION enable constraint PRES_PROD_FK;
2. inserting the missing rows in the parent table (TIZAYUCA.PRODUCTO) before executing
alter table TIZAYUCA.PRESENTACION enable constraint PRES_PROD_FK;
3. making the new constraint ignore the present data and enforcing the relationship starting with new data:
alter table TIZAYUCA.PRESENTACION
add constraint PRES_PROD_FK foreign key (GRUPO, PRODUCTO)
references TIZAYUCA.PRODUCTO (GRUPO, CLAVE)
deferrable initially deferred
enable novalidate;
(drop the present PRES_PROD_FK constraint first)
Please find more on the constraint topic here:
http://download-east.oracle.com/docs/cd/B14117_01/server.101/b10759/clauses002.htm#CJAFFBAA
and here:
http://download-east.oracle.com/docs/cd/B14117_01/server.101/b10759/clauses002.htm#i1002273
Best regards,
Luis Morales,
ConsiteNicaragua.com

Cascade Update in Oracle Constraint ?

How can I create a Constraint in Oracle 9i with Cascade Update Option like On Delete Cascade.
It means, if I change the primary key of master table, the foreign key of all the relevant child tables should be updated automatically.
Any idea please ?
Best Regards,
Luqman

Oracle doesn't intrinsically have the concept of a CASCADE UPDATE.
From a data modeling standpoint, primary keys should never, ever change under any circumstances. If a column can ever change, it should not be used as a primary key.
Tom Kyte has a package and some code to generate triggers that would do this sort of thing
http://asktom.oracle.com/~tkyte/update_cascade/index.html
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Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

Cascade Update (Urgent)

Dear Friends,
I need to update the master records have records in details tables. Can anyone suggest me the feature of CASCADE UPDATE. So that moment i changed the master record it should reflect to detail records.
I DON'T WANT TO USE CURSOR TO UPDATE RECORDS IN DETAILS.
Thanks.

Hi,
You can try to use the pre-update, on-update, post-update trigger for the master-block. In that you can parse an update statement for the detail block. This will 'simulate' a cascade delete
Hope this helps.

Updating PK with same value - effect on CASCADE UPDATE

Hello,
I would like to understand how sql server 2008 deals with cascade updates
For example I have
Parent table: Employee with column Id as varchar(20) primary key
Child table with IdEmployee as varchar(20) foreign key
I set up Cascade Update for those two tables, meaning any change to primary key in Employee table will cause update in child table rows that match affecting Id
Scenario 1:
Update Employee
set Id = 'ABC',
Name = 'something new'
where Id = 'CCC'
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Scenario 2:
Update Employee
set Id = 'ABC',
Name = 'something new 2'
where Id = 'ABC'
This time, i am doing something different. I am beside update of column Name with new value, also update primary key but
with SAME value
Question is: what is going to happen to child rows? Are they ALL going to UPDATE due to CASCADE UPDATE
So far, what i did in order to find solution is:
1. I put an timestamp column in child table that should update each time row gets updated
2. I put a trigger for update event on child table that will write something to some log table
*After I set up those two I ran example like above just to be sure timestamp gets changed as well trigger is being fired
Results of updating PK with same value:
1. Timestamp didnt change
2. Trigger didnt fire
Is this enough to make conclusion that updating primary key with same value ALONG with updating some other columns won't
affect child tables with UPDATE CASCADE ON
Update:
Database is CI AS collation
If i do following
Update Employee
set Id = 'abc',
Name = 'something new'
where Id = 'ABC'
1. Timestamp will change
2. Trigger will fire
Conclusion: Case sensitive is important here!
Thank you very much in advance
Milos

>> would like to understand how sql server 2008 deals with cascade updates <<
Your posting has a number of conceptual errors.
1. The terms “parent” and “child” are not RDBMS; they are used in network databases. We have “referenced” and “referencing” tables; they can be the same table.
2. A table models a SET of things, so there is no “Employee” table unless you truly have a one-man company. We want a collective or plural name for the SET/table. A better name is “Personnel” for this table.
3. Her is no such thing as a generic “id” in RDBMS; it has to be “<something in particular>_id” to be valid. Identifiers are usually fixed length
4. It is very, very rude not to post DDL on a forum. You also do not know the ISO-11179 Rules for data element names. They do not change names from table to table! Does your name change whenever you use it in a new place?? NO! Same principle with data.
5. The ISO standard uses “<property>_<attribute property>” syntax, no the old PascalCase.
6. Why did you post a useless narrative? How do we compile “I SET up Cascade UPDATE for those two tables,..” to test it??
CREATE TABLE Personnel
(emp_id CHAR(20) NOT NULL PRIMARY KEY,
emp_name VARCHAR(25) NOT NULL,
CREATE TABLE Health_Plan
(health_plan_acct CHAR(20) NOT NULL PRIMARY KEY,
emp_id CHAR(20) NOT NULL
REFERENCES Personnel(emp_id)
ON UPDATE CASCADE
ON DELETE CASCADE,
Scenario 1:
UPDATE Personnel
SET emp_id = 'ABC',
emp_name = 'something new'
WHERE emp_id = 'CCC';
Result of child table: all rows with foreign key emp_id and value of 'CCC' are updated. Expected behavior.
Scenario 2:
UPDATE Personnel
SET emp_id = 'ABC',
emp_name = 'something new 2'
WHERE emp_id = 'ABC';
This time, I am doing something different. I am beside UPDATE of column emp_name with new value, also UPDATE PRIMARY KEY but
with SAME value.
>> Question is: what is going to happen to child [sic: referencing] rows? Are they ALL going to UPDATE due to CASCADE UPDATE. <<
SQL uses a set-oriented model, so the whole table is updated as a unit of work in theory.
So far, what I did in order to find solution is:
>> I put an timestamp column in child [sic: referencing] table that should UPDATE each time row gets updated <<
Why? It is not in the SET clause list; it cannot change. As an aside, The T-SQL TIMESTAMP is not the ANSI/ISO TIMESTAMP; it is DATETIME2(n) in T-SQL. The old TIMESTAMP is being deprecated because it stinks both in concept and implementation.
>> I put a trigger for UPDATE event on child [sic: referencing] table that will write something to some log table.<<
TRIGGERs are fired by what is called a “database event” shown in the ON [DELETE | UPDATE] clause. T-SQL adds INSERT as an event. An update to any value or to no value at all is still an update. Depending on the collation, case may or may not matter in the final
outcome.
--CELKO-- Books in Celko Series for Morgan-Kaufmann Publishing: Analytics and OLAP in SQL / Data and Databases: Concepts in Practice Data / Measurements and Standards in SQL SQL for Smarties / SQL Programming Style / SQL Puzzles and Answers / Thinking
in Sets / Trees and Hierarchies in SQL

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Edited by: Philip Eller on May 20, 2008 9:03 AM

Hi Darpal Thiarha,
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Error in updating condition table 372

Hello,
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Thanks in Advance

Dear All,
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Normally while doing Exports we are tempted to use the same sales area and accordingly we may give the combination of excise grp+series grp+export type in IMG>>>Logistics General>>>India>>>Business transactions>>>Outgoing excise invoices>>>Maintain default excise groups and series groups.
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I am using JDev version : 11.1.2.0.0
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After the page load, first selection of the Master Table works correctly and detail tables update correctly.
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float:right"><table id="pt1:t1:c10::afrSI" _afrHoverable="true" style="display:none" class="xzs" cellpadding="0" cellspacing="0"><tr><td _afrSortAsc="1"><a tabIndex="-1" class="xza" title="Sort Ascending"></a></td><td _afrSortDesc="1"><a tabIndex="-1" class="xzb" title="Sort Descending"></a></td></tr></table></div><div class="x19d">FieldTypeLen</div></th><th id="pt1:t1:c11" _d_index="10" _afrLeaf="true" _afrRoot="true" align="left" class="xz7"><div style="position:relative; float:right"><table id="pt1:t1:c11::afrSI" _afrHoverable="true" style="display:none" class="xzs" cellpadding="0" cellspacing="0"><tr><td _afrSortAsc="1"><a tabIndex="-1" class="xza" title="Sort Ascending"></a></td><td _afrSortDesc="1"><a tabIndex="-1" class="xzb" title="Sort Descending"></a></td></tr></table></div><div class="x19d">IgnoreField</div></th><th id="pt1:t1:c12" _d_index="11" _afrLeaf="true" _afrRoot="true" align="left" class="xz7"><div style="position:relative; float:right"><table id="pt1:t1:c12::afrSI" _afrHoverable="true" style="display:none" class="xzs" cellpadding="0" cellspacing="0"><tr><td _afrSortAsc="1"><a tabIndex="-1" class="xza" title="Sort Ascending"></a></td><td _afrSortDesc="1"><a tabIndex="-1" class="xzb" title="Sort Descending"></a></td></tr></table></div><div class="x19d">IsMandatory</div></th><th id="pt1:t1:c13" _d_index="12" _afrLeaf="true" _afrRoot="true" align="left" class="xz7"><div style="position:relative; float:right"><table id="pt1:t1:c13::afrSI" _afrHoverable="true" style="display:none" class="xzs" cellpadding="0" cellspacing="0"><tr><td _afrSortAsc="1"><a tabIndex="-1" class="xza" title="Sort Ascending"></a></td><td _afrSortDesc="1"><a tabIndex="-1" class="xzb" title="Sort Descending"></a></td></tr></table></div><div class="x19d">RecordType</div></th></tr></table></div><div id="pt1:t1::db" class="xyx" style="position:relative;width:100%;overflow:hidden" _afrColCount="13"></div><div id="pt1:t1::sm" class="xzt" style="position:absolute;display:none"></div><div id="pt1:t1::ri" class="xyz" style="position:absolute;display:none;overflow:hidden"></div><div id="pt1:t1::dataW" style="display:none"></div></div>]]></update><update id="f1::postscript"><![CDATA[<span id="f1::postscript"><span id="f1::postscript:st"><input type="hidden" name="javax.faces.ViewState" value="!-75cc188st"></span></span>]]></update><update id="d1::iconC"><![CDATA[<span id="d1::iconC" style="display:none"><span id="af_table::disclosed-icon"></span><span id="af_table::undisclosed-icon"></span></span>]]></update><update id="javax.faces.ViewState"><![CDATA[!-75cc188st]]></update><eval><![CDATA[AdfPage.PAGE.__handleRichResponseAction('/MillenniumCSD-ViewController-context-root/faces/FileDefinition?_adf.ctrl-state=cmpl0ptfg_7');]]></eval><eval><![CDATA[AdfPage.PAGE.sendStreamingRequest("pt1:t1");]]></eval><extension id="adf-script-library">/MillenniumCSD-ViewController-context-root/afr/partition/gecko/default/opt/dnd-SHERMAN-1147.js</extension><extension id="adf-script-library">/MillenniumCSD-ViewController-context-root/afr/partition/gecko/default/opt/nav-SHERMAN-1147.js</extension><extension id="adf-script-library">/MillenniumCSD-ViewController-context-root/afr/partition/gecko/default/opt/menu-SHERMAN-1147.js</extension><extension id="adf-script-library">/MillenniumCSD-ViewController-context-root/afr/partition/gecko/default/opt/table-SHERMAN-1147.js</extension><eval>AdfPage.PAGE.addResource('javascript','/MillenniumCSD-ViewController-context-root/JarLoaderPages/jquery-1.7.1.min.js');</eval><eval>AdfPage.PAGE.addResource('javascript','/MillenniumCSD-ViewController-context-root/JarLoaderPages/dis_contx.js');</eval><eval>AdfPage.PAGE.addResource('javascript','/MillenniumCSD-ViewController-context-root/js/floating_bar_bottom.js');</eval><eval>if(self.window.name != "MillenniumDepository"){ self.location = "mcsd.html"; }</eval><eval><![CDATA[AdfDhtmlLookAndFeel.addSkinProperties({"af|table-tr-column-scroll-animation-duration":"300","af|table-tr-column-reorder-animation-duration":"600","af|table-tr-hover-highlight-row":"true"});AdfPage.PAGE.addComponents(new AdfRichTable('pt1:t1',{'rowSelection':'single','rowBandingInterval':0,'editingMode':'none','afrSelListener':true}),new AdfRichColumn('pt1:t1:c1',{'sortProperty':'DateFormat','sortable':true,'minimumWidth':12,'rowHeader':false}),new AdfRichColumn('pt1:t1:c2',{'sortProperty':'DefinisionId','sortable':true,'minimumWidth':12,'rowHeader':false}),new AdfRichColumn('pt1:t1:c3',{'sortProperty':'FieldId','sortable':true,'minimumWidth':12,'rowHeader':false}),new AdfRichColumn('pt1:t1:c4',{'sortProperty':'FieldLabel','sortable':true,'minimumWidth':12,'rowHeader':false}),new AdfRichColumn('pt1:t1:c5',{'sortProperty':'FieldLength','sortable':true,'minimumWidth':12,'rowHeader':false}),new AdfRichColumn('pt1:t1:c6',{'sortProperty':'FieldOffset','sortable':true,'minimumWidth':12,'rowHeader':false}),new AdfRichColumn('pt1:t1:c7',{'sortProperty':'FieldOrder','sortable':true,'minimumWidth':12,'rowHeader':false}),new AdfRichColumn('pt1:t1:c8',{'sortProperty':'FieldStatus','sortable':true,'minimumWidth':12,'rowHeader':false}),new AdfRichColumn('pt1:t1:c9',{'sortProperty':'FieldType','sortable':true,'minimumWidth':12,'rowHeader':false}),new AdfRichColumn('pt1:t1:c10',{'sortProperty':'FieldTypeLen','sortable':true,'minimumWidth':12,'rowHeader':false}),new AdfRichColumn('pt1:t1:c11',{'sortProperty':'IgnoreField','sortable':true,'minimumWidth':12,'rowHeader':false}),new AdfRichColumn('pt1:t1:c12',{'sortProperty':'IsMandatory','sortable':true,'minimumWidth':12,'rowHeader':false}),new AdfRichColumn('pt1:t1:c13',{'sortProperty':'RecordType','sortable':true,'minimumWidth':12,'rowHeader':false}));AdfPage.PAGE.__recordSessionTimeout(1800000, 120000, "http://127.0.0.1:7101/MillenniumCSD-ViewController-context-root/faces/FileDefinition");AdfPage.PAGE.__initPollingTimeout(600000);AdfPage.PAGE.clearMessages();AdfPage.PAGE.clearSubtreeMessages('pt1:t1');AdfPage.PAGE.clearSubtreeMessages('pt1:resId1');]]></eval></changes></partial-response>
When not running correctly, Response of the Post Definition is
<?xml version="1.0" ?> <partial-response><changes><update id="f1::postscript"><![CDATA[<span id="f1::postscript"><span id="f1::postscript:st"><input type="hidden" name="javax.faces.ViewState" value="!-75cc188st"></span></span>]]></update><update id="javax.faces.ViewState"><![CDATA[!-75cc188st]]></update><eval><![CDATA[AdfPage.PAGE.__handleRichResponseAction('/MillenniumCSD-ViewController-context-root/faces/FileDefinition?_adf.ctrl-state=cmpl0ptfg_7');]]></eval><eval>AdfPage.PAGE.addResource('javascript','/MillenniumCSD-ViewController-context-root/JarLoaderPages/jquery-1.7.1.min.js');</eval><eval>AdfPage.PAGE.addResource('javascript','/MillenniumCSD-ViewController-context-root/JarLoaderPages/dis_contx.js');</eval><eval>AdfPage.PAGE.addResource('javascript','/MillenniumCSD-ViewController-context-root/js/floating_bar_bottom.js');</eval><eval>if(self.window.name != "MillenniumDepository"){ self.location = "mcsd.html"; }</eval><eval><![CDATA[AdfPage.PAGE.__recordSessionTimeout(1800000, 120000, "http://127.0.0.1:7101/MillenniumCSD-ViewController-context-root/faces/FileDefinition");AdfPage.PAGE.__initPollingTimeout(600000);AdfPage.PAGE.clearMessages();AdfPage.PAGE.clearSubtreeMessages('pt1:t1');AdfPage.PAGE.clearSubtreeMessages('pt1:resId1');]]></eval></changes></partial-response>
I could not figure out what went wrong when integrating to another module.
Can you please help me to rectify this problem.
Thanks
dk

Hi,
sound to be an implementation specific issue that is hard to comment on without knowing how to reproduce it. If you have a rerooducible test case based on the Oracle HR schema using JDeveloper 11.1.1.6, zip it up, rename the "zip "extension to "unzip" and sent it to the mail address you find in my OTN profile. If you don't have that test case, explain how this can be reproduced
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