Oracle PL/SQL Tutorial/PL SQL Statements/EXIT — различия между версиями
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Текущая версия на 10:05, 26 мая 2010
Содержание
EXIT a FOR LOOP
SQL>
SQL> set serveroutput on
SQL> set echo on
SQL>
SQL> BEGIN
2 FOR v_loopcounter IN 1..20 LOOP
3 IF MOD(v_loopcounter,2) = 0 THEN
4 DBMS_OUTPUT.PUT_LINE("The AREA of the circle is " ||v_loopcounter*v_loopcounter * mypi);
5 END IF;
6 IF v_loopcounter = 10 THEN
7 EXIT;
8 END IF;
9 END LOOP;
10 END;
11 /
The AREA of the circle is 12.56
The AREA of the circle is 50.24
The AREA of the circle is 113.04
The AREA of the circle is 200.96
The AREA of the circle is 314
PL/SQL procedure successfully completed.
SQL>
SQL>
Exit a function
SQL> set serveroutput on
SQL> set echo on
SQL>
SQL> CREATE OR REPLACE function exitfunc(myString VARCHAR2)
2 RETURN NUMBER IS
3 v_current_position INTEGER := 1;
4 v_counter NUMBER := 0;
5 BEGIN
6 WHILE v_current_position <= LENGTH(myString) LOOP
7 IF SUBSTR(myString,v_current_position,1) != " " THEN
8 v_counter := v_counter + 1;
9 ELSE
10 NULL;
11 END IF;
12 v_current_position := v_current_position + 1;
13 EXIT WHEN SUBSTR(myString,v_current_position,1) = " ";
14 END LOOP;
15 RETURN v_counter ;
16 END exitfunc;
17 /
Function created.
SQL>
SQL>
SQL> DECLARE
2 v_MYTEXT VARCHAR2(20) := "THIS IS A TEST";
3 BEGIN
4 DBMS_OUTPUT.PUT_LINE("Total count is " || exitfunc(v_MYTEXT));
5 END;
6 /
Total count is 4
PL/SQL procedure successfully completed.
SQL>
EXIT a LOOP WHEN a certain condition
SQL> set serveroutput on
SQL> set echo on
SQL>
SQL> DECLARE
2 v_Radius NUMBER := 2;
3 BEGIN
4 LOOP
5 DBMS_OUTPUT.PUT_LINE("The AREA of the circle is " ||
6 v_RADIUS*v_RADIUS * mypi);
7 v_Radius := v_Radius + 2;
8 EXIT WHEN v_Radius > 10;
9 END LOOP;
10 END;
11 /
The AREA of the circle is 12.56
The AREA of the circle is 50.24
The AREA of the circle is 113.04
The AREA of the circle is 200.96
The AREA of the circle is 314
PL/SQL procedure successfully completed.
EXIT a WHILE LOOP
SQL>
SQL> set serveroutput on
SQL> set echo on
SQL>
SQL> DECLARE
2 v_Radius NUMBER := 2;
3 BEGIN
4 WHILE TRUE LOOP
5 DBMS_OUTPUT.PUT_LINE("The Area is "||mypi * v_Radius * v_Radius);
6 IF v_Radius = 10 THEN
7 EXIT;
8 END IF;
9 v_Radius := v_Radius + 2 ;
10 END LOOP;
11 END;
12 /
The Area is 12.56
The Area is 50.24
The Area is 113.04
The Area is 200.96
The Area is 314
PL/SQL procedure successfully completed.
SQL>
SQL>
EXIT statement with Label
SQL>
SQL> set serveroutput on
SQL> set echo on
SQL>
SQL> BEGIN
2 <<outerloop>>
3 FOR v_outerloopcounter IN 1..2 LOOP
4 <<innerloop>>
5 FOR v_innerloopcounter IN 1..4 LOOP
6 DBMS_OUTPUT.PUT_LINE("Outer Loop counter is "||
7 v_outerloopcounter ||
8 " Inner Loop counter is " ||
9 v_innerloopcounter);
10 EXIT outerloop WHEN v_innerloopcounter = 3;
11 END LOOP innerloop;
12 END LOOP outerloop;
13 END;
14 /
Outer Loop counter is 1 Inner Loop counter is 1
Outer Loop counter is 1 Inner Loop counter is 2
Outer Loop counter is 1 Inner Loop counter is 3
PL/SQL procedure successfully completed.
SQL>
Exit to a Label
SQL> set serveroutput on
SQL> DECLARE
2 just_a_num NUMBER := 1;
3 BEGIN
4 <<just_a_loop>>
5 LOOP
6 dbms_output.put_line(just_a_num);
7 EXIT just_a_loop
8 WHEN (just_a_num >= 10);
9
10 just_a_num := just_a_num + 1;
11 END LOOP;
12 END;
13 /
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PL/SQL procedure successfully completed.
SQL>
SQL>
EXIT WHEN
SQL>
SQL> set serveroutput on
SQL> set echo on
SQL>
SQL> DECLARE
2 v_Radius NUMBER := 2;
3 BEGIN
4 WHILE TRUE LOOP
5 DBMS_OUTPUT.PUT_LINE("The Area is " ||mypi * v_Radius * v_Radius);
6 EXIT WHEN v_RADIUS = 10;
7 v_Radius := v_Radius + 2 ;
8 END LOOP;
9 END;
10 /
The Area is 12.56
The Area is 50.24
The Area is 113.04
The Area is 200.96
The Area is 314
PL/SQL procedure successfully completed.
SQL>
Using "EXIT WHEN" in a loop
SQL>
SQL>
SQL> -- create demo table
SQL> create table Employee(
2 ID VARCHAR2(4 BYTE) NOT NULL,
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>
SQL>
SQL> DECLARE
2 v_Counter BINARY_INTEGER := 1;
3 BEGIN
4 LOOP
5 INSERT INTO employee (id) VALUES (v_Counter);
6 v_Counter := v_Counter + 1;
7 EXIT WHEN v_Counter > 50;
8 END LOOP;
9 END;
10 /
PL/SQL procedure successfully completed.
SQL>
SQL> select * from employee;
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
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58 rows selected.
SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
2 /
Table dropped.