Database and Servlets (searching and restriction)


How do you restric users to enter one id such that if the other user enters the same id there will be a message telling him that that id has been entered.

How do you entered a record into two different tables after the user has entered once

wbmorapediAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

msterjevCommented:
Before you enter the id into the table check if it exists against the table with following SQL statement:

int id=5;
boolean present=false;
resultset=statement.executeQuery("SELECT * FROM Table1 WHERE id='+id;
if(resultset.next())
     present=true;
resultset.close();

if(!present)
{
     statement.execute("INSERT INTO Table1 VALUES.......");
     statement.execute("INSERT INTO Table2 VALUES.......");
}
statement.close();
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
msterjevCommented:
I forgot that you want message :-)

int id=5;
boolean present=false;
resultset=statement.executeQuery("SELECT * FROM Table1 WHERE id='+id;
if(resultset.next())
    present=true;
resultset.close();

if(!present)
{
    statement.execute("INSERT INTO Table1 VALUES.......");
    statement.execute("INSERT INTO Table2 VALUES.......");
}
else
{
    System.out.println("The requested ID is already present;please inter another one!");
}
statement.close();
0
msterjevCommented:
Thanks
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Java EE

From novice to tech pro — start learning today.