Create auto-detect-error-swallowing.pls

Author: Steven Feuerstein

plsql/error-management/auto-detect-error-swallowing.pls

@@ -0,0 +1,67 @@
+/*
+
+Automatically Detect Exception Handlers That ''Swallow Up'' Errors
+
+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.
+
+LiveSQL link: https://livesql.oracle.com/apex/livesql/file/content_C0VIPVWBK1FY057S1ZOOMKXE2.html
+
+*/
+
+/* Force 6009 Warning as a Compile Error 
+
+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.
+
+*/
+
+ALTER SESSION SET plsql_warnings = 'Error:6009'
+/
+
+/* 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;
+/
+
+/* 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;
+/
+
+/* 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;
+/
+
+