Automatically Detect Exception Handlers That ''Swallow Up'' Errors

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Script Name Automatically Detect Exception Handlers That ''Swallow Up'' Errors
Description Use compile time warnings to be warned if the compiler has identified an exception handler that does not contain a RAISE statement or a call to RAISE_APPLICATION_ERROR.
Area PL/SQL General
Contributor Steven Feuerstein
Created Thursday March 17, 2016

Statement 1
Not only does this demonstrate a very cool feature of compile-time warnings (you can convert a warning into an error), but it also gets around a (current) limitation of LiveSQL: it is not yet displaying compile time warnings. Only compile failures. PLW-06009 warning is: "PLW-06009: procedure "string" OTHERS handler does not end in RAISE or RAISE_APPLICATION_ERROR" Cause: The OTHERS handler can exit without executing some form of RAISE or or a call to the standard procedure RAISE_APPLICATION_ERROR.
Force 6009 Warning as a Compile Error
```
ALTER SESSION SET plsql_warnings = 'Error:6009'
```
```
Statement processed.
```

Statement 2

A RETURN is Not a Re-raise - FAIL!

CREATE OR REPLACE FUNCTION plw6009 
   RETURN VARCHAR2 
AS 
BEGIN 
   RETURN 'abc'; 
EXCEPTION 
   WHEN OTHERS 
   THEN 
      RETURN 'abc'; 
END plw6009;

Error at line 7: PLS-06009: procedure "PLW6009" OTHERS handler does not end in RAISE or RAISE_APPLICATION_ERROR

More Details: https://docs.oracle.com/error-help/db/ora-06009

Statement 3

A Re-raise of the Current Exception - OK!

CREATE OR REPLACE FUNCTION plw6009 
   RETURN VARCHAR2 
AS 
BEGIN 
   RETURN 'abc'; 
EXCEPTION 
   WHEN OTHERS 
   THEN 
      RAISE; 
END plw6009;

Function created.

Statement 4

Raise a New Error - OK!

CREATE OR REPLACE FUNCTION plw6009 
   RETURN VARCHAR2 
AS 
BEGIN 
   RETURN 'abc'; 
EXCEPTION 
   WHEN OTHERS 
   THEN 
      RAISE_APPLICATION_ERROR (-20000, 'I am raising an exception!'); 
END plw6009;

Function created.

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