How to Raise Error ?

[Vishal Patel]

Hello everyone,

Is there any work around in MySQL to raise error based on Application (Business) Logic?

Consider the following case:

I have two tables a and b. Table ‘a’ have stock transaction data while table ‘b’ have stock balance data. In table ‘a’ each issue and receipt of stock is entered and in table ‘b’ balance after each issue and receipt is stored. Now, before every issue we need to check balance that it should not become negative after current issue. If that case occurs we have to raise the error and stop the transaction being saved in database for table ‘a’.

Hope I have clearly mentioned my point. I’ll appreciate any help in this context.

Thanks in advance.

Regards,
Vishal