DBMS_WARNING package : DBMS_WARNING « PL SQL Programming « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial
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Oracle PL/SQL Tutorial » PL SQL Programming » DBMS_WARNING 
24. 27. 1. DBMS_WARNING package
SQL>
SQL>
SQL>
SQL> -- create demo table
SQL> create table Employee(
  2    ID                 VARCHAR2(BYTE)         NOT NULL primary key,
  3    First_Name         VARCHAR2(10 BYTE),
  4    Last_Name          VARCHAR2(10 BYTE),
  5    Start_Date         DATE,
  6    End_Date           DATE,
  7    Salary             Number(8,2),
  8    City               VARCHAR2(10 BYTE),
  9    Description        VARCHAR2(15 BYTE)
 10  )
 11  /

Table created.

SQL>
SQL> -- prepare data
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2               values ('01','Jason',    'Martin',  to_date('19960725','YYYYMMDD'), to_date('20060725','YYYYMMDD'), 1234.56'Toronto',  'Programmer')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('02','Alison',   'Mathews', to_date('19760321','YYYYMMDD'), to_date('19860221','YYYYMMDD'), 6661.78'Vancouver','Tester')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('03','James',    'Smith',   to_date('19781212','YYYYMMDD'), to_date('19900315','YYYYMMDD'), 6544.78'Vancouver','Tester')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('04','Celia',    'Rice',    to_date('19821024','YYYYMMDD'), to_date('19990421','YYYYMMDD'), 2344.78'Vancouver','Manager')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('05','Robert',   'Black',   to_date('19840115','YYYYMMDD'), to_date('19980808','YYYYMMDD'), 2334.78'Vancouver','Tester')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values('06','Linda',    'Green',   to_date('19870730','YYYYMMDD'), to_date('19960104','YYYYMMDD'), 4322.78,'New York',  'Tester')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values('07','David',    'Larry',   to_date('19901231','YYYYMMDD'), to_date('19980212','YYYYMMDD'), 7897.78,'New York',  'Manager')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values('08','James',    'Cat',     to_date('19960917','YYYYMMDD'), to_date('20020415','YYYYMMDD'), 1232.78,'Vancouver', 'Tester')
  3  /

row created.

SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select from Employee
  2  /


ID   FIRST_NAME           LAST_NAME            START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- -------------------- -------------------- --------- --------- ---------- ---------- ---------------
01   Jason                Martin               25-JUL-96 25-JUL-06    1234.56 Toronto    Programmer
02   Alison               Mathews              21-MAR-76 21-FEB-86    6661.78 Vancouver  Tester
03   James                Smith                12-DEC-78 15-MAR-90    6544.78 Vancouver  Tester
04   Celia                Rice                 24-OCT-82 21-APR-99    2344.78 Vancouver  Manager
05   Robert               Black                15-JAN-84 08-AUG-98    2334.78 Vancouver  Tester
06   Linda                Green                30-JUL-87 04-JAN-96    4322.78 New York   Tester
07   David                Larry                31-DEC-90 12-FEB-98    7897.78 New York   Manager
08   James                Cat                  17-SEP-96 15-APR-02    1232.78 Vancouver  Tester

rows selected.

SQL>
SQL>
SQL> PROMPT ** Set the PLSQL_WARNING level to DISABLE:ALL
** Set the PLSQL_WARNING level to DISABLE:ALL
SQL>
SQL> CALL DBMS_WARNING.SET_WARNING_SETTING_STRING('DISABLE:ALL', 'SESSION');

Call completed.

SQL>
SQL>
SQL> --Create a procedure that does not include an EXIT WHEN statement in the loop
SQL>
SQL> CREATE OR REPLACE PROCEDURE compile_warning
  2  AS
  3
  4     v_title VARCHAR2(100);
  5
  6     CURSOR dbms_warning_cur
  7     IS
  8     SELECT id
  9     FROM employee;
 10
 11  BEGIN
 12
 13     OPEN dbms_warning_cur;
 14
 15     LOOP
 16     FETCH dbms_warning_cur INTO v_title;
 17     -- there should be a line to exit here
 18     -- like EXIT WHEN dbms_warning_cur%NOTFOUND
 19
 20     DBMS_OUTPUT.PUT_LINE('Titles Available: '||v_title);
 21
 22     END LOOP;
 23
 24     CLOSE dbms_warning_cur;
 25
 26  END;
 27  /

Procedure created.

SQL>
SQL> PROMPT ** The procedure compiles fine
** The procedure compiles fine
SQL>
SQL> SET SERVEROUTPUT ON ESCAPE OFF
SQL>
SQL> CALL DBMS_WARNING.SET_WARNING_SETTING_STRING('ENABLE:ALL', 'SESSION');

Call completed.

SQL>
SQL> SELECT DBMS_WARNING.GET_WARNING_SETTING_STRING() WARNING_LEVEL FROM dual;


WARNING_LEVEL
------------------------
ENABLE:ALL

row selected.

SQL> -- Now recompile the same procedure
SQL>
SQL> ALTER PROCEDURE compile_warning COMPILE;

SP2-0805: Procedure altered with compilation warnings

SQL>
SQL> -- This shows that there is a warning message.  Type SHOW ERRORS to see what the problem is.
SQL>
SQL>
SQL> SHOW ERRORS
Errors for PROCEDURE COMPILE_WARNING:


LINE/COL   ERROR
------------------------------------------
24/4       PLW-06002: Unreachable code

SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
  2  /

Table dropped.
24. 27. DBMS_WARNING
24. 27. 1. DBMS_WARNING package
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