SQL>
SQL>
SQL>
SQL> -- create demo table
SQL> create table Employee(
2 ID VARCHAR2(4 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 /
1 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 /
1 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 /
1 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 /
1 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 /
1 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 /
1 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 /
1 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 /
1 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
8 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
1 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.