MYSQL data

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I am writing a console application which must generate reports according to the data in mysql(write the report according to the email column). What i want to do is, populate a datatable with the one entire column. Then, the program should loop through the datatable. And add every email it comes accross to another table i created in mysql. But it must verify that the email it is adding is not already in the database. So it should check the database before just adding data.

Could i ask anyone for help on this?

Thank you in advance.

Posted 6-Dec-10 1:10am

WynandS

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wizardzz 6-Dec-10 17:38pm

Just a quick question, why are you using 2 datatables for this?

WynandS 7-Dec-10 2:15am

Well not that i want to use two tables. I am working for a company, and our client has two tables.
So it is not by choice.

2 solutions

Solution 1

You can try before inserting a record for checking whether the specific record-email is already been there or not.

SQL

select cout(emailid) where emailid='xyz@abc.com'
or
select * where emailid='xyz@abc.com'

if retrieved query result contains any row then you must not insert the record with that email id as its already present.

Posted 6-Dec-10 4:08am

sandipapatel

Updated 6-Dec-10 4:23am

v2

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JOAT-MON · Accepted Answer · 2010-12-06T14:11:00

Solution 3

Another way is to:

SELECT DISTINCT email FROM tablename

This will return a unique list of the email addresses in the table and prevent having to loop through results.

Posted 6-Dec-10 14:11pm

JOAT-MON