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- 06-11-2011, 09:45 PM #1Member
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- May 2011
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Setting Auto increment problem :(-:
I have a problem with my java apllication that i am unable to create a enitity persistence class..
The problem is that it does not takes the database table for entity class that doesn't have PRIMARY KEY..
I found a way for it by applying PRIMARY KEY as AUTOINCREMENT column..
But, since my application is to be work continuosly with database i cannot estimate a typical auto-increment value limit..
Now what i want is to apply a composit primary key with "date" , "id" column as primary keys together, the "id" must be a AUTO-INCREMENT value that can reset itself from the begening whenever a day changes , i.e, id values resets itself after each day ??
How can i achive this ??
What i tried is like something as follows::
create table test ( id int(4) zerofill auto_increment, mydate date, primary key (mydate,id) ); insert into test (mydate) values ('2011-06-01'), ('2011-06-02'), ('2011-06-02'), ('2011-06-01'), ('2011-06-01'), ('2011-06-03');
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