Solved: ADF BC and primary keys - how to implement without using triggers
Using the following OBE as an example:
http://www.oracle.com/technology/obe/obe9051jdev/ADFWorkshop/BuildingADFApplicationsWorkshop.htm
There is just one view that has CustomerId defined as a primary key, where the value for the primary key comes from the customer_seq sequence.
How do you create the model using ADF BC entity to create an entity object that has a primary key that needs to be populated by a sequence table when inserted WITHOUT using a trigger?
Basically I want to just use ADF BC instead of toplink in the OBE. We do not use triggers to insert primary keys, so this example is a good match for what I need.
Can someone help me out. How do I adjust the model to use just ADF BC - how do I define the entity object to use a sequence. Do I just override the create method in the impl? Is it that simple? Or is there a way to do this point and click in the entity tool.
Thanks!
I'm not the dba (or one of several) - so don't shoot the messenger... the dba's do not like to use triggers in the code. I have been told that this has caused too many problems in application development.
I don't ask why, just deal with the fallout.
I did try using the following code in a create method:
protected void create(AttributeList attributeList)
super.create(attributeList);
SequenceImpl s = new SequenceImpl("customers_seq", getDBTransaction());
// this.setCustId(s.getSequenceNumber());
this.createPrimaryKey(s.getSequenceNumber());
When I run the test program for the module, I get a new entry with the id empty and greyed out. I was hoping that this would be filled in on the actual insert, but no joy. As soon as I try to commit, I get an error:
(oracle.jbo.AttrValException) JBO-27014: Attribute CustId in CustomersWSView is required)
So what needs to be done?
Message was edited by:
klee
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Best practices with sequences and primary keys
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The value for the created_date is NOT set at the database level (as sysdate) but rather by the application when it creates the object which is persisted by Hibernate. In a multi-threaded environment, thread A could create the object and then get blocked by thread B which is able to create the object and persist it with key N after which control returns to thread A it persists it with key N+1. In this scenario thread A has an earlier timestamp but a larger key so will be ordered before thread B which is in error.
I like to think of primary keys as solely something to be used for referential purposes at the database level rather than inferring application level meaning (like the larger the key the more recent the record etc.). What do you guys think? Am I being too rigorous in my views here? Or perhaps I am even mistaken in how I interpret this?>
I think the chronological order of records should be using a timestamp (i.e. "order by created_date desc" etc.)
>
Not that old MYTH again! That has been busted so many times it's hard to believe anyone still wants to try to do that.
Times are in chronological order: t1 is earlier (SYSDATE-wise) than t2 which is earlier than t3, etc.
1. at time t1 session 1 does an insert of ONE record and provides SYSDATE in the INSERT statement (or using a trigger).
2. at time t3 session 2 does an insert of ONE record and provides SYSDATE
(which now has a value LATER than the value used by session 1) in the INSERT statement.
3. at time t5 session 2 COMMITs.
4. at time t7 session 1 COMMITs.
Tell us: which row was added FIRST?
If you extract data at time t4 you won't see ANY of those rows above since none were committed.
If you extract data at time t6 you will only see session 2 rows that were committed at time t5.
For example if you extract data at 2:01pm for the period 1pm thru 1:59pm and session 1 does an INSERT at 1:55pm but does not COMMIT until 2:05pm your extract will NOT include that data.
Even worse - your next extract wll pull data for 2pm thru 2:59pm and that extract will NOT include that data either since the SYSDATE value in the rows are 1:55pm.
The crux of the problem is that the SYSDATE value stored in the row is determined BEFORE the row is committed but the only values that can be queried are the ones that exist AFTER the row is committed.
About the best you, the user (i.e. not ORACLE the superuser), can do is to
1. create the table with ROWDEPENDENCIES
2. force delayed-block cleanout prior to selecting data
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As luck would have it there is a thread discussing just that in the Database - General forum here:
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http://apex.oracle.com/pls/otn/f?p=31517:157
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http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://apex.oracle.com/pls/otn/f?p=31517:1
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OTN.
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http://www.trendo-kft.hu
SQL> create table scott.tbl_clob
2 (sss CLOB)
3 /
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Team , Thanks for your help in advance !
I'm looking out to code a dynamic SQL which should refer Master tables for table names and Primary keys and then Join for insertion into target tables .
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Rajkumar YeluguHi Rajkumar,
It is glad to hear that you figured the question out by yourself.
There's a flaw with your while loop in your sample code, just in case you hadn't noticed that, please see below.
--In this case, it goes to infinite loop
DECLARE @T TABLE(ID INT)
INSERT INTO @T VALUES(1),(3),(2)
DECLARE @ID INT
SELECT @ID = MIN(ID) FROM @T
WHILE @ID IS NOT NULL
PRINT @ID
SELECT @ID =ID FROM @T WHERE ID > @ID
So a cursor would be the appropriate option in your case, please reference below.
DECLARE @Table_Info TABLE
Table_info_ID INT,
Table_Name VARCHAR(99)
INSERT INTO @Table_Info VALUES(1,'lp_order'),(7,'lp__transition_record');
DECLARE @Table_PK_Info TABLE
Table_PK_Info_ID INT,
Table_info_ID INT,
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WHILE @@FETCH_STATUS = 0
BEGIN
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SET @SQL = 'INSERT INTO hub.dbo.'+@Table_Name+'
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WHERE NOT EXISTS (
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Eric Zhang
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http://www.allapplabs.com/interview_questions/db_interview_questions.htm#q13
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Hi!
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Edited by: Dermot ONeill on Oct 22, 2009 12:18 PM -
What is the diffrence between Row id and primary key ?
dear all
my question is about creating materialized views parameters (With Rowid and
With Primary kry)
my master table contains a primary key
and i created my materialized view as follow:
CREATE MATERIALIZED VIEW LV_BULLETIN_MV
TABLESPACE USERS
NOCACHE
LOGGING
NOCOMPRESS
NOPARALLEL
REFRESH FAST ON DEMAND
WITH PRIMARY KEY
AS
SELECT
BCODE ID, BTYPE BTYPE_ID,
BDATE THE_DATE,SYMBOL_CODE STOCK_CODE,
BHEAD DESC_E, BHEADARB DESC_A,
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(You're example shows that) are not possible.
Complex remote (replication) snapshots cannot be based on Rowid too.
for 10.1
http://download-west.oracle.com/docs/cd/B14117_01/server.101/b10759/statements_6002.htm#sthref5054
for 10.2
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_6002.htm#sthref6873
So I guess (didn't check it) that this applies ONLY to replication snapshots.
This is not documented clearly though (documentation bug ?!)
Documentation states that the following is generally not possible with Rowid MVIEWS:
Distinct or aggregate functions
GROUP BY or CONNECT BY clauses
Subqueries
Joins
Set operations
Rowid materialized views are not eligible for fast refresh after a master table reorganization until a complete refresh has been performed.
The main purpose of my statements was to try to give a few tips how to avoid common problems with this complex subject, like for example: being able to CREATE an MVIEW with fast refresh clause does not really guarantee that it will refresh fast in the long run (reorganisation, partition changes) if ROWID based, further the rowid mviews have limitations according to the documentation (no group by, no connect by, link see above) plus fast refresh means only to use filter columnns of the mview logs, plus for aggregates you need additional count (*) pseudo columns.
kind regards
Karsten
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