PLSQL WHEN
时间: 2024-02-10 19:33:18 浏览: 34
PL/SQL is a procedural language extension for Oracle's SQL database. It is used to write stored procedures, functions, triggers, and other database objects. The "WHEN" clause is often used in PL/SQL to handle exceptions or implement conditional logic.
For example, the "WHEN" clause can be used with the "EXCEPTION" keyword to specify certain conditions under which an exception should be handled. Here's an example:
```plsql
BEGIN
-- Some code here
EXCEPTION
WHEN <exception_condition_1> THEN
-- Code to handle exception condition 1
WHEN <exception_condition_2> THEN
-- Code to handle exception condition 2
-- More exception conditions and corresponding code
END;
```
In this code structure, if any exception occurs within the "BEGIN" block, PL/SQL will check the conditions specified after the "WHEN" keyword. If the exception matches any of the conditions, the corresponding code block will be executed to handle that specific exception.
Please note that the specific exception conditions and their corresponding code blocks would depend on your application's requirements.