What are the methods for handling exceptions in Oracle stored procedures?

1 year ago
William Carter
2 minutes

In Oracle stored procedures, you can use exception handling to capture and handle exceptional situations. Exception handling can be achieved through the following methods:

1. By utilizing the EXCEPTION section in a stored procedure, you can catch exceptions and handle them accordingly. Custom or system-defined exception types can be used to address different error scenarios.

DECLARE
  custom_exception EXCEPTION;
BEGIN
  -- 一些数据库操作
EXCEPTION
  WHEN OTHERS THEN
    -- 异常处理代码
    RAISE custom_exception;
END;

Using the RAISE_APPLICATION_ERROR function: By using the RAISE_APPLICATION_ERROR function, you can trigger a custom exception and specify the error code and message, allowing you to convey specific error information to the user.

IF condition THEN
  RAISE_APPLICATION_ERROR(-20001, 'Custom error message');
END IF;

Using SQLCODE and SQLERRM functions: you can utilize SQLCODE and SQLERRM functions to retrieve the error code and error message of the most recent SQL statement that caused an exception, and then take appropriate action.

DECLARE
  error_code NUMBER := SQLCODE;
  error_message VARCHAR2(100) := SQLERRM;
BEGIN
  DBMS_OUTPUT.PUT_LINE('Error Code: ' || error_code);
  DBMS_OUTPUT.PUT_LINE('Error Message: ' || error_message);
END;

By using the above methods, it is possible to handle exceptions in Oracle stored procedures, ensuring that the program can properly manage and provide appropriate error messages when encountering exceptions.

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