Using a field to subtract or add to a number field in the database

Hi everyone I use Jdeveloper 1.5 with ADF and have the following functionality
I have 3 fields
Account withdrawing from:
Account depositing to:
Sum:
In the database I have 2 tables clients and accounts. Client table has client name, adress phone, account number which is a foreign key in a one to many relationship with accounts. Accounts table has account number and account balance which is a number and represents the amount of money u have in your account. Each client has one or more accounts and can put money in other people's accounts or transfer between his own accounts (if he has more than one) So what I want is for the fields above to withdraw the sum from the account and deposit into another account or throw an error "Not enough funds" if the account withdrawing from has less money in it than is written in the field.
Unfortunately I have no idea how to do this and was hoping u guys could help.

2. Use a ValueChange listener on the input text field and query the account balance before processing the deposit
How do I do this? When you say query you mean sql query right? The thing is I'm not sure if I will be allowed to use Jdeveloper for this or will have to use Dreamweaver so would love to use as much SQL as possible.

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