Exception raised while validating admin name
e.g: BEGIN select * from per_all_people_f where employee_number=100; EXCEPTION WHEN EXCEP_1 THEN dbms_output.put_line ('A SELECT...INTO did not return any row.'); END; c) User-defined Exceptions:this is the condition where the user need to check for occurance of a exception while validating large number of data. e.g: Declare exception_name EXCEP_1; BEGIN select * from per_all_people_f where employee_number=100; Raise EXCEP_1; exception WHEN EXCEP_1 THEN dbms_output.put_line ('A SELECT...Sometimes you need to perform clean up actions whether or not your program succeeds.These situations are good candidates for using a finally block.However, if a Path Too Long Exception exception was raised, the second catch part would catch the exception.This is because there isn’t a catch block for the Path Too Long Exception exception and the generic Exception type catch block is the only option available to catch the exception.However, there are times when you don’t know if an error will occur.
A catch block is a good place to figure out what may have gone wrong and try to recover, however it can’t account for all scenarios.For example, the Message property provides summary information about what the error was, the stacktrace property provides information from the stack for where the problem occurred, and the To String() method is overridden to reveal a verbose description of the entire exception.Identifying the exceptions you’ll need to handle depends on the routine you’re writing. Open Read() method, it could throw any of the following exceptions: It’s easy to find out what exceptions a method can raise by looking in the . Just go to the Reference/Class Library section and look in the Namespace/Class/Method documentation for the methods you use.When exceptions are thrown, you need to be able to handle them. Code that could throw an exception is put in the try block and exception handling code goes in the catch block.Listing 15-1 shows how to implement a try/catch block.
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These things are generally unlikely, but they could still happen and you want to be able to deal with them when they do occur. When exceptions occur, they are said to be “thrown”.