Question

I need a quick solution please share your ideas here. I have 500 phone numbers stored in mysql database.

Asked by: cutie_smily

I have 500 phone numbers stored in mysql database with their status.

For instance, if i a add new phone to the database. How do i get only new phone number added instead getting all phones.

Do we need to compare with all records and see or count the number os records in database and if no of records not equal how do we get the newly added phones.

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Asked On
2006-09-06 at 09:34:27ID21979963
Topic

Java Programming Language

Participating Experts
5
Points
500
Comments
16

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Answers

 

by: CEHJPosted on 2006-09-06 at 09:36:23ID: 17464409

You should probably have an numeric id field too. Then to get the latest you could do

select phone from phones where id = max(id)

 

by: Ajay-SinghPosted on 2006-09-06 at 09:36:49ID: 17464412

You can mention versioning of the records of the phone numbers and see if newest version record

 

by: CEHJPosted on 2006-09-06 at 09:37:29ID: 17464419

Another approach is to use a 'date added' field. This can be used in a similar way

 

by: CEHJPosted on 2006-09-06 at 09:42:05ID: 17464459

>>This can be used in a similar way

Except of course it's more flexible and can be used for groups of numbers from a certain date

 

by: cutie_smilyPosted on 2006-09-06 at 09:49:54ID: 17464522

Date added feild- is it the date the phone added to database ???

Can be more brief how its going to get only newly added phones.

We might add one phone in the morning and one in the evening. The morning added phone going to be old. Might check database every 20 minutes.

 

by: CEHJPosted on 2006-09-06 at 09:52:29ID: 17464541

Yes, the date you added it to the db. You can then query based on the date (time). The field should be of type timestamp

 

by: objectsPosted on 2006-09-06 at 14:47:44ID: 17466649

if u need to track newly added numbers then probably should be storing them in a different table
create a new table table for newly added numbers, and add new numbers to that.
once you have processed these new number and no longer consider them new numbers then they can be moved to your existing table.
Leaving the table of new numbers empty ready for insertion on more new numbers.

 

by: mbvvsatishPosted on 2006-09-06 at 22:39:33ID: 17468391

effective date approach is the right one (as CHEJ mentioned).
query the db using the effective date.

effective date is the date in which the new phone number is effective or the date added to the database

 

by: objectsPosted on 2006-09-06 at 22:43:39ID: 17468396

you may not know the effective date, more flexible to use a seperate table allowing you to easily control what are new numbers and which aren't.

 

by: CEHJPosted on 2006-09-06 at 23:08:01ID: 17468456

You always know the effective date, since the defaults are

fromDate: now
toDate: the end of time

 

by: YagantappaPosted on 2006-09-07 at 00:02:06ID: 17468631

The table need to be designed well. Your table should have the following
1. An auto increment numeric column. This column be having values like 1,2,3,...... This column will get values automatically
2. Phone number
3. Status. I am not sure what you are storing in this column.
4. Date when phone added including timestamp.
5. A bit column that can have only 0 or 1 value. 1 means already processed or retrieved the phone number (meaning old one) and 0 means new one.

If you want to get all newly added phone numbers irrespective of status, just query the table with where condition on column 5. As soon as you get these newly added phone numbers, you need to update column 5 with '0' value so that the same phone numbers will not be retrieved again.
If you want to get all phone numbers during a day, query the table with column 4

 

by: cutie_smilyPosted on 2006-09-10 at 12:14:35ID: 17490384

will get back with points soon.
Thanks everybody for the above ideas

 

by: objectsPosted on 2006-09-10 at 16:02:31ID: 17490919

> The table need to be designed well. Your table should have the following

using two tables will remove many of thoses needs and reduce the complexity of the problem
trying to jam everything into a single table is going to be messay and error prone

 

by: CEHJPosted on 2006-09-11 at 00:34:30ID: 17492287

You only really need two extra fields in the table for what you want:

createdDate,
lastUpdatedDate

If you want to keep a track of when entities are effective, a second table *could* be used.

id|effectiveFrom|effectiveTo
--------------------------------

This would require ids be unique across the db for all entities

20120131-EE-VQP-002

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