MySQL Auto Increment Keys

Is there a way to use MySQL Auto Increment Keys with Kodo?
sean.

Actually, I believe that the auto-increment support is in the current
2.5.0 release (beta 2).
-Patrick
On Fri, 11 Apr 2003 22:11:02 -0400, Marc Prud'hommeaux wrote:
Note that the feature isn't available in the current beta, but it will
be available in the final release (which will be out "real soon now").
In article <[email protected]>, Abe
White wrote:
I believe we've added some auto-increment support in our 2.5 beta,
available here:
http://solarmetric.com/Software/beta/2.5.0
Patrick Linskey
SolarMetric Inc.

Similar Messages

Retrieve new row's auto-increment key from dataprovider

** cross posted on SDN JSC Forum and Netbeans J2EE Nabble forum **
I have a page that is bound to a MySQL table rowset or, alternately, a new (append()'ed) row. The row's Primary Key is a MySQL auto-increment Integer (translates to a Long.) After commit()'ing the the new row to the database, how would I then get the new row's ID (fieldname "ID")? If I refresh() the dataprovider and try to get the value an error is thrown.
Some background: The dataprovider's backing rowset has a query parameter for the ID field. I set it to "0" if the page is creating a new row or I set it to the unique ID if the page is displaying an existing row. After the new row is committed, I need the new ID set the query parameter and synch up related rows in different tables that are keyed off the ID in this (master) table. I'd like to do this without "guessing" what the ID would be in advance as that method isn't foolproof in heavy usage.
Additionally, it strikes me as a useful workaround if the unique ID was a UUID (mySQL UUID() function) that does not run the risk of any concurrency issues. Has anyone used this solution in VWP? How would I make the call for the underying DB (in this case MySQL, but could be anything) to generate the UUID? Is the call DB specific or is there a JDBC equivalent?
UPDATE: never mind the GUID question, I can use the java.rmi.dgc.VMID class to autogenerate unique GUID's for this purpose. Being from a Lotus Notes background, I'm used to the power and flexibility such Unique ID's bring to the app. dev's portfolio.
Thanks in adv. for any help .
-Jake
Message was edited by:
jakeochs

JSF together with JBoss Seam offers some real good possibilities to improve developer productivity. Right now, with JSF you can create forms where fields are persistent (saved in a database), but you have to write code to persist fields. In Notes/Domino, every field you drop in the form is automatically set to persist without writing a single piece of code. JBoss Seam aims to provide the missing glue to tie the JSF beans with business logic (EJB) and persistent layer (JPA). I think tools for Seam are still not mature. I would love to see JSC/VWB utilizing Seam. I know there is a NetBean plugin for Seam but it was written for old NetBeans (not VWP or JSC), so it doesn't work with the visual web pack where you can drag and drop JSF components.

Composite Primary Key or Auto Increment key ?

Hi.. i have two ways for make something and don't know what's better ......
Problem : 3 tables
Client ----> ( 1,* ) Activity -----> (1,1) ActivityAccreditation
A Client it can have one or more activities, and one Activity have one ActivityAccreditation. On Client the primary key is CLIENT_ID, the two ways for generate the keys on the other tables are :
a ) On Activity the primary key is composed by CLIENT_ID and SEQUENCE_ACTIVITY ( a number than increment value by CLIENT_ID, example : CLIENT_ID = 1122 could have SEQUENCE_ACTIVITY from 1 to 3 for three activities, and CLIENT_ID = 1122 could have SEQUENCE_ACTIVITY from 1 to 4 for four activities ), and ActivityAccreditation have CLIENT_ID and SEQUENCE_ACTIVITY and ACCREDITATION_TYPE ( a code ).
b) On Activity the primary key is ACTIVITY_ID ( auto increment number ) with the CLIENT_ID like foreign key only. And on ActivityAccreditation have ACTIVITY_ACCREDITATION_ID like primary key and ACTIVITY_ID like foreign key.
The situation is than the numer of rows could to grow very much in the time ( 3.000.000 rows on ActivityAccreditation in one year and the database to be supported each five years ) and we don't know what solution is better by performance......
Tks.

I prefer the surrogate key.
I don't like composite keys as a rule because they tend to inject business logic into keys. Using surrogate keys eliminates this possibility.
For performance reasons, this means that you might want to create additional indexes on those columns to facilitate fast access. But my prejudice is to stick with surrogate keys.
I will admit that I'm not a DBA, so there are certain to be alternative views and arguments. We'll see if any of them pop up on this thread.

How to get auto-increment value after insert on ACCESS db?

When you insert a new record to a table with an auto-incrementing key, how do you find the value for the row you just inserted? This works differently with different databases. I know how it's done on ORACLE and mySql.
How does it work with ACCESS through ODBC? How about MSSQL?

I have discovered there's a LAST aggregate function which when I've tested it gets the just inserted auto-increment, but I'm not sure if it's reliable. You have to do:
SELECT LAST(index-field) FROM table
That ought to be faster than MAX, which I've noticed some people use. Persumable LAST will get the value from the last row in the table's natural order.
In fact an auto-increment field has no business filling in missing slots since the main point is a a foreign key in other tables and a foreign key pointing to a deleted table row ought to be invalidated, not point to some unrelated successor record.
I could use a separate table as a source of counters, of course, though that's one more call. In either case I'm worried about thread safety. In Oracle there are special sequence objects for this purpose which are incremented and read atomically. I'm not sure if the access driver transaction handling works adequately.
Perhaps the safest approach might be to use a separate sequencer table and Java sychronisation to serialise access to each row in the sequencer table (assuming all the access is from the same app).

How can I use a mySQL database schema with numeric auto increment primary key instead of GUID?

Hello!
I'm using the TestStand "MySQL Insert (NI)" database schema with GUID as primary key. So everything works fine.
But I prever using numeric values as primary key, because the database is in conjunction with another database which uses numeric values as primary key.
Is this possible?
Has anyone an idea how I can modify the "Generic Recordset (NI)" for use with MySQL?
Thanks!
Configuration:
Microsoft Windows XP
TestStand 3.1
MySQL 4.1.12a
MySQL ODBC 3.51 Driver
Brosig

Adam -
The TestStand Database Logging feature does not allow you to run a separate SQL command after executing the command for a statement(table), so I do not think that you can use an auto incrementing column for the tables. There is just no way to get it back in a generic way. One option that I tried is something similar to the Oracle schema where you call a store procedure to return a sequence ID for each record that you want to add.
So you would have to create the following sequence table in MySQL:
CREATE TABLE sequence (id INT NOT NULL);
INSERT INTO sequence VALUES (0);
Then create a stored procedure as shown below that will increment the sequence value and return it in a recordset:
CREATE PROCEDURE `getseqid`()
BEGIN
        UPDATE sequence SET id=LAST_INSERT_ID(id+1);
        SELECT LAST_INSERT_ID();
END
Then update the MySQL tables to use INT primary and foreign key values, so the TestStand MySQL SQL file to create all tables would have text like this:
CREATE TABLE UUT_RESULT
ID    INT PRIMARY KEY,
~
CREATE TABLE STEP_RESULT
ID    INT PRIMARY KEY,
UUT_RESULT   INT NOT NULL,
~
Then update the schema primary and foreign key columns in the TestStand Database Options dialog box to be INT to match the table. For the primary key columns, you will have to set the Primary Key Type to "Get Value from Recordset" and set the Primary Key Command Text to "call getseqid()". This will call the stored procedure to determine the next value to use as the ID value.
Hope this helps...
Scott Richardson
National Instruments

EjbCreate returns primary key - auto increment

ejbCreate of a BMP entity bean must return the primary key.
If i have an auto-incrementer (in MySQL) and i insert the new data in this method, how can i then find the primary key to return?
Surely i cannot just use a select statement in another method as the other data in the table may not be unique and may not return the correct primary key.
Help Please
Thanks
Dave

Hi,
PreparedStatement ps = con.prepareStatement("INSERT INTO food_data (description)" + " VALUES (?)");
//Get generated primary key
ResultSet res = ps.getGeneratedKeys();
while (res.next())
{ key = res.getInt(1);
This code requires JDK 1.4.2.
Any other soln for previous versions of JDK (1.4.1 or 1.3.1)
Seetesh

How to get the auto increment integer primary key value of a new record

I have a DB table that has a auto increment integer primary key, if I insert a new record into it by SQL statement "INSERT INTO...", how can I get the integer primary key value of that newly created record?

Well maybe someone knows a better method, but one workaround would be to add a dummy field to your table. When a new record is inserted this dummy field will be null. Then you can select your record with SELECT keyField FROM yourTable WHERE dummyField IS NULL. Once you've got the key number, you then update the record with a non-null value in the dummyField. Bit of a bodge, but it should work...
Another alternative is, instead of using an Autonumbered key field, you could assign your own number by getting the MAX value of the existing keys (with SELECT MAX(keyField) FROM yourTable) and using that number + 1 for your new key. Might be a problem if you have lots of records and frequent deletions though.

CMP with auto-increment primary key.Please help

Hi all,
I new with EJB technology so please bear with me.
Env: 2k Server, SQL 2k Server
Sun One(Forte EE) to develop and deploy CMP
I got the servlet to load the data from CMP's business mehods
is fine. Calling the findPrimaryKey is OK too. Even when I try to insert the row into DB is OK. At this time I make key PK is int AND NOT
AUTO INCREMENT everything is OK. In the ejbCreate method
I called setPK, setName ...It's fine.
The problem comes when I try to make the PK(still int) to be auto-increment field.In ejbCreate not call setPK because of in SunOne IDE, under the J2EE RI tab of EJB Module property, the Auto generate SQL I set to false so that I can
modify the SQL statement under SQL Deployment.createRow not taking the PK. I thought that will do it but it doesnot like it at all (I got Exception with transaction rollback)I just want to insert a single row with ID and name that's all.
Then I changed the SQL statment take PK and changed the Auto Generate SQL to True and in ejbCreate the PK as one of the args and called setPK this time with null object. It doesn't like neither.(Exception Cannot set the primary key with null. That is reasonable.)
I thought using EJB fast and clean technique would help developer to develop application with easiness.
So I realy stuck with this, I wonder ejb 2.0 support for auto increment at all because I would like to take advantage of the auto increment feature of the DB without writing the PrimaryKeySequence generator at all.
Am I missing something with this? May be just config thing to tell
that my PK is auto-increment field so that when the ejbCreate called it knows not taking the PK or even not asking to call setPK in ejbCreate.
Any help would appreciated.

Check out this thread, there's a bunch of good info:
http://www.theserverside.com/patterns/thread.jsp?thread_id=4976

Primary key column auto increment

Hello,
In my Azure SQL Database I noticed that weird thing is happening. I have table with primary key column with auto increment, and all works fine, on new insert that value automatically increment, but every now and then, that value, for no reason, increments
for 1000.
For instance i have in DB values in this order: 1, 2, 3, 4, 1001, 1002, 1003, 2004, 2005, 3001, 3002...
Why is this happening?

Hello ,
you can see this thread :
http://stackoverflow.com/questions/17012339/windows-azure-sql-database-identity-auto-increment-column-skips-values
It's seems that SQL Server work with sequence and block 1000 values. In the cloud, your SQL Azure Database can be move from one server to an other or restarted and so a new sequence is used. That's why you jump from 4 to 1001.
Regards

Utilizing auto-increment/identity fields for primary key with "application" identity

Is it possible to utilise an auto-increment (identity in MS SQL Server)
field for the primary key field when using "application" identity?

To the best of my knowledge, you cannot use auto-increment. Due to the
differences in the way that identities are generated at the datastore
(upon insert) vs. JDO (upon makePersistent), this feature of SQLServer is
not supported yet.
However, we do provide a variety of other ways of generating identity
which may provide a closer fit to what you want, and
our users may have some experience in solving your problem.
On Tue, 28 Jan 2003 09:56:08 +0000, Sean Ryan wrote:
Is it possible to utilise an auto-increment (identity in MS SQL Server)
field for the primary key field when using "application" identity?--
Stephen Kim
[email protected]
SolarMetric, Inc.
http://www.solarmetric.com

DB Adapter - PostgreSQL - Primary key - auto increment handling

Hi,
I have to connect to a PostgreSQL DB. I have a table in which has a primary key called seq_id. This seq_id is being incremented using a sequence.
I have to configure the DB adapter for this table. The problem is that while creating the adapter it does not allow me to deselect the primary key (seq_id). Because of this I have to supply a value for the seq_id while inseting the data using the adapter. But this defeats the purpose of sequence (auto increment).
Is there a way to get around this and to avoid specifying the value for seq_id while using the DB Adapter and let it get inserted using the sequence of the DB?
Thanks,
Sanjay

Hello ,
you can see this thread :
http://stackoverflow.com/questions/17012339/windows-azure-sql-database-identity-auto-increment-column-skips-values
It's seems that SQL Server work with sequence and block 1000 values. In the cloud, your SQL Azure Database can be move from one server to an other or restarted and so a new sequence is used. That's why you jump from 4 to 1001.
Regards

Auto Increment of primary key value in jdeveloper.

hi all,
i have one table with one primary key.
i want to increment that primary key when ever i go for CreateInsert or create operation in JSF page.
i have tried with db sequence value type, but i was not able to achieve my condition. in DB Sequence i got error like cannot convert java.class.string to java.class.dbsequence.
can any one suggest me in this to achieve my condition.
regards,
M vijayalakshmi.

hi all,
from this i found the simple method to achive the auto increment of primary key.
http://www.techartifact.com/blogs/2012/10/adding-number-for-primary-key-in-oracle-adf-using-groovy-by-sequence.html#ixzz2EeU9CWo6
in this am facing an one small issue.
intial value of the primary key is 1.
for this value i have entered the row of data.
again i have clicked on the create button.
then the value of the primary key has increased to 2.
for this value i didnt entered the row of data to databse.
just i closed the browser.
if i run the run page again, the value of primary key is 3.
my requirment is i shd get the value of primary key is "2".
the increment shd happen the maxi value present in the primary key of the table.
can any one help me in this how to achive this.
thanks in advance.
regards,
M vijayalakshmi.

Primary key violation exception in auto increment column

Hi All,
I am facing one issue in Multi threaded environment.
I am getting Primary key violation exception in auto increment column. I have a table and the primary key is the auto increment column, and I have a trigger which is populating this column.
5 threads are running and inserting the data in the table and throwing Primary key violation exception randomly.
create table example (
id number not null,
name varchar2(30)
alter table example
add constraint PK1example primary key (id);
create sequence example_id_seq start with 1 increment by 1;
create or replace trigger example_insert
before insert on example
for each row
begin
select example_id_seq.nextval into :new.id from dual;
end;
Any idea how to handle auto increment column(trigger) in Multi threaded environment??
Thanks,

user13566109 wrote:
Thanks All,
Problem was in approach; removed the trigger and placed a seq.nextval in insert query. It has resolved the issue.I very much suspect that that was not the issue.
The trigger would execute for each insertion and the nextval would have been unique for each insertion (that's how sequences work in oracle), so that wouldn't have been causing duplicates.
I suspect, more likely, that you had some other code somewhere that was using another sequence or some other method of generating the keys that was also inserting into the same table, so there was a conflict in the sources of the sequences being generated.
The way you showed you had coded above, was a perfectly normal way to assign primary keys from a sequence, and is not a problem in a multi user/threaded environment.

Auto increment of key in TopLink (by Anizio)

Hi friends!
Sameone know how I do auto increment of key when I insert an object on the data base with topLink?
I have used to Jdeveloper 1013
Thank

Hi Doug
I tryed but happened a error.
I do this: in my descriptor, I enable the options "Use sequencing", then, this is equals:
Name: SEQ_ID_TITULAR
Table: DEVPORTAL.CAD_TITULAR
Fiels: CAD_TITULAR.TIT_ID
In the name I put the sequence name created in the database, but an error called "invalid number" happen.
Can you help me ?

Auto increment with collection is not working

I am using KODO 3.0 with MYSQL 4.0.16. I have created two JDO object as
follows
BankAccount contains a collection of Contacts object. My metadata looks
like this
<class name="BankAccount">
<field name="contacts">
<collection element-type="Contacts"/>
<extension vendor-name="kodo" key="element-dependent"
value="true"/>
</field>
</class>
<class name="Contacts" objectid-class="Contacts$contactId">
<field name="contactId" primary-key="true">
<extension vendor-name="kodo" key="jdbc-auto-increment"
value="true"/>
</field>
</class>
There is no problem in the persisting of BankAccount object and adding
Contacts to it, but Contacts collation is not retrieved along with parent
object. In the database join table, the contact Id value it is always set
to null.
Things are working well with out contact id in Contacts.
Can anyone help?
Regards,
dharmi

Set the following property:
kodo.jdbc.AutoIncrementConstraints: true
Described here:
http://www.solarmetric.com/Software/Documentation/latest/docs/ref_guide_pc_oid.html#ref_guide_pc_oid_pkgen_autoinc

MySQL Auto Increment Keys

Similar Messages

Maybe you are looking for