в 13:45, 26 мая 2010

2010-05-26T13:45:46Z

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2010-05-26T10:06:39Z

1 версия

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== If new value is null use the value from a sequence==



<source lang="sql">
SQL>
SQL>
SQL> create table myTable (id number);
Table created.
SQL>
SQL> create sequence wo_seq;

SQL>
SQL> create or replace trigger trg_id before insert
2 on myTable
3 for each row
4 when (new.id is null)
5 begin
6 select wo_seq.nextval into :new.id from dual;
7 end;
8 /
Trigger created.
SQL>
SQL> drop table myTable;
Table dropped.
SQL></source>

== React to Inserting and Updating actions==



<source lang="sql">
SQL>
SQL> create table ord
2 (
3 order_no integer primary key
4 ,empl_no integer
5 ,order_date date not null
6 ,total_order_price number(7,2)
7 ,deliver_date date
8 ,deliver_time varchar2(7)
9 ,payment_method varchar2(2)
10 ,emp_no number(3,0)
11 ,deliver_name varchar2(35)
12 ,gift_message varchar2(100)
13 );
Table created.
SQL>
SQL>
SQL>
SQL> insert into ord(order_no,empl_no,order_date,total_order_price,deliver_date,deliver_time,payment_method,emp_no,deliver_name,gift_message)
2 values(1,1,add_months(sysdate, -1), 235.00, "14-Feb-1999", "12 noon", "CA",1, null, "Gift for wife");
1 row created.
SQL>
SQL> insert into ord(order_no ,empl_no ,order_date ,total_order_price ,deliver_date ,deliver_time ,payment_method ,emp_no,deliver_name ,gift_message )
2 values(2,1,add_months(sysdate, -2), 50.98, "14-feb-1999", "1 pm", "CA",7, "Rose", "Happy Valentines Day to Mother");
1 row created.
SQL>
SQL> insert into ord(order_no ,empl_no ,order_date ,total_order_price ,deliver_date ,deliver_time,payment_method ,emp_no,deliver_name ,gift_message )
2 values(3, 2,add_months(sysdate, -3), 35.99, "14-feb-1999", "1 pm", "VS",2, "Ruby", "Happy Valentines Day to Mother");
1 row created.
SQL>
SQL> insert into ord(order_no ,empl_no ,order_date ,total_order_price ,deliver_date ,deliver_time,payment_method ,emp_no,deliver_name ,gift_message )
2 values(4, 2,add_months(sysdate, -4), 19.95, "14-feb-1999", "5 pm", "CA",2, "Coy", "Happy Valentines Day to You");
1 row created.
SQL>
SQL> insert into ord(order_no ,empl_no ,order_date ,total_order_price ,deliver_date ,deliver_time,payment_method ,emp_no,deliver_name ,gift_message )
2 values(7, 9,add_months(sysdate, -7), 35.95, "21-jun-1999", "12 noon", "VS", 2, "Fill", "Happy Birthday from Joe");
1 row created.
SQL>
SQL> insert into ord(order_no ,empl_no ,order_date ,total_order_price ,deliver_date ,deliver_time,payment_method ,emp_no,deliver_name ,gift_message )
2 values (8, 12, add_months(sysdate, -8), 35.95, "1-jan-2000", "12 noon", "DI",3, "Laura", "Happy New Year""s from Lawrence");
1 row created.
SQL>
SQL> insert into ord(order_no ,empl_no ,order_date ,total_order_price ,deliver_date ,deliver_time,payment_method ,emp_no,deliver_name ,gift_message )
2 values (9, 12, add_months(sysdate, -9), 75.95, "2-jan-2000", "12 noon", "CA",7, "Sara", "Happy Birthday from Lawrence" );
1 row created.
SQL>
SQL> insert into ord(order_no ,empl_no ,order_date ,total_order_price ,deliver_date ,deliver_time,payment_method ,emp_no,deliver_name ,gift_message )
2 values(10, 4, add_months(sysdate, -10), 19.95, sysdate, "2:30 pm", "VG",2, "OK", "Happy Valentines Day to You");
1 row created.
SQL>
SQL> insert into ord(order_no ,empl_no ,order_date ,total_order_price ,deliver_date ,deliver_time,payment_method ,emp_no,deliver_name ,gift_message )
2 values(11, 2, add_months(sysdate, -11), 30.00, sysdate+2, "1:30 pm", "VG",2, "Hi", "Happy Birthday Day to You");
1 row created.
SQL>
SQL> insert into ord(order_no ,empl_no ,order_date ,total_order_price ,deliver_date ,deliver_time,payment_method ,emp_no,deliver_name ,gift_message)
2 values(12, 7, add_months(sysdate, -12), 21.95, sysdate-2, "3:30 pm", "CA",2, "Jack", "Happy Birthday Day to You");
1 row created.
SQL>
SQL> insert into ord(order_no ,empl_no ,order_date ,total_order_price ,deliver_date ,deliver_time,payment_method ,emp_no,deliver_name ,gift_message)
2 values(13, 7, add_months(sysdate, -1), 21.95, sysdate, "3:30 pm", "CA",2, "Jay", "Thanks for giving 100%!");
1 row created.
SQL>
SQL>
SQL>
SQL>
SQL> create table ord_item
2 (
3 order_no integer
4 ,product_id integer
5 ,quantity number(4,0)
6 ,item_price number(7,2)
7 ,total_order_item_price number(9,2)
8 ,primary key (order_no ,product_id)
9 );
Table created.
SQL>
SQL>
SQL>
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(1, 2, 10, 23.00 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(2, 1, 1, 23.00 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(2, 5, 1, 10.50 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(2, 8, 1, 17.48 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(3, 8, 1, 35.99 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(4, 7, 1, 19.95 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(5, 5, 1, 10.95 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(6, 8, 1, 22.95 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(7, 1, 6, 15.00 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(7, 5, 1, 10.50 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(7, 8, 1, 10.45 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(8, 8, 1, 35.95 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(9, 8, 1, 65.45 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(9, 5, 1, 10.50 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(10, 3, 1, 19.95 );
1 row created.
SQL> insert into ord_item (order_no, product_id, quantity, item_price) values(11, 8, 1, 30.00);
1 row created.
SQL>
SQL> create or replace trigger tr_total_order_price
2 before
3 update of item_price or insert or delete
4 on ord_item
5 for each row
6 declare
7 v_change_in_price number;
8 v_order_no number;
9 begin
10
11 if inserting then
12 :new.total_order_item_price := :new.item_price * :new.quantity ;
13
14 v_change_in_price := :new.item_price * :new.quantity;
15
16 v_order_no := :new.order_no;
17
18 dbms_output.put_line("inserting"||:new.total_order_item_price);
19
20 elsif updating then
21
22 :new.total_order_item_price := :new.item_price * :new.quantity ;
23
24 v_change_in_price := (:new.item_price * :new.quantity) - (:old.item_price * :old.quantity) ;
25
26 v_order_no := :old.order_no;
27
28 dbms_output.put_line("updating");
29
30 else
31
32 v_change_in_price := (:old.item_price * :old.quantity) * -1;
33
34 v_order_no := :old.order_no;
35
36 dbms_output.put_line("deleting");
37
38 end if;
39
40 update ord
41 set total_order_price = total_order_price + v_change_in_price
42 where order_no = v_order_no;
43
44 end;
45 /
Trigger created.
SQL> show errors
No errors.
SQL>
SQL> select total_order_price from ord where order_no = 7;
TOTAL_ORDER_PRICE
-----------------
35.95
SQL> select total_order_item_price from ord_item
2 where order_no = 7 and product_id = 6;
no rows selected
SQL>
SQL> insert into ord_item (order_no, product_id, quantity, item_price)
2 values (7, 6, 2, 5) ;
1 row created.
SQL> update ord_item set item_price = 25 where order_no = 7 and product_id = 5 ;
1 row updated.
SQL> select total_order_price from ord where order_no = 7;
TOTAL_ORDER_PRICE
-----------------
60.45
SQL> select total_order_item_price from ord_item
2 where order_no = 7 and product_id = 6;
TOTAL_ORDER_ITEM_PRICE
----------------------
10
SQL>
SQL>
SQL> drop table ord;
Table dropped.
SQL>
SQL> drop table ord_item;
Table dropped.</source>

== Trigger that logs actions for inserting actions==



<source lang="sql">
SQL>
SQL>
SQL>
SQL> create table employee
2 (
3 emp_no integer primary key
4 ,lastname varchar2(20) not null
5 ,firstname varchar2(15) not null
6 ,midinit varchar2(1)
7 ,street varchar2(30)
8 ,city varchar2(20)
9 ,state varchar2(2)
10 ,zip varchar2(5)
11 ,zip_4 varchar2(4)
12 ,area_code varchar2(3)
13 ,phone varchar2(8)
14 ,salary number(5,2)
15 ,birthdate date
16 ,hiredate date
17 ,title varchar2(20)
18 ,dept_no integer
19 ,mgr integer
20 ,region number
21 ,division number
22 ,total_sales number
23 );
Table created.
SQL>
SQL>
SQL>
SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip,zip_4, area_code, phone, birthdate, title)
2 values (1,"Gardinia","Joy","R","688 Ave","New York","NY","12122","2333","212","200-3393","12-nov-1956","President");
1 row created.
SQL>
SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip, zip_4, area_code, phone, salary, birthdate, hiredate, title, dept_no, mgr, region, division, total_sales)
2 values (2,"Anderson","Lucy","J","33 Ave","New York","NY","43552","6633","212","234-4444",7.75,"21-mar-1951","1-feb-1994","Sales Manager",2,1,100,10,40000);
1 row created.
SQL>
SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip, zip_4, area_code, phone, salary, birthdate, hiredate,title, dept_no, mgr, region, division, total_sales)
2 values (3,"Somers","Ingrid","E","12 Ave","New York","NY","76822","8763","212","867-6893",7.75,"14-feb-1963","15-mar-1995","Sales Clerk",2,2,100,10,10000);
1 row created.
SQL>
SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip,zip_4, area_code, phone, salary, birthdate, hiredate, title, dept_no, mgr, region, division, total_sales)
2 values (4,"Washington","Georgia","J","13th Street","New York","NY","43122","4333","212","340-4365",11.50,"2-jul-1963","21-apr-1994","Designer",1,1,100,10,40000);
1 row created.
SQL>
SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip, zip_4, area_code, phone, salary, birthdate, hiredate, title, dept_no, mgr, region, division, total_sales)
2 values (5,"Doright","Dudley","J","56 Langer Street","Staten Island","NY","23332","4983","718","777-4365",21.65,"15-may-1958","2-aug-1994","Designer",1,1,100,10,40000);
1 row created.
SQL>
SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip,zip_4, area_code, phone, salary, birthdate, hiredate,title, dept_no, mgr, region, division, total_sales)
2 values ( 6,"Doright","Dorothy","R","56 Langer Street","Staten Island","NY","23332","4983","718","777-4365",24.65,"10-dec-1968","2-aug-1994","Designer",1,1,100,10,40000);
1 row created.
SQL>
SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip, zip_4, area_code, phone, salary, birthdate, hiredate, title, dept_no, mgr, region, division, total_sales)
2 values ( 7,"Perry","Donna","R","1st Ave","New York","NY","44444","3444","212","111-6893",7.75,"14-feb-1967","15-mar-1995","Sales Clerk",2,1,100,10,40000);
1 row created.
SQL>
SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip, zip_4, area_code, phone, salary, birthdate, hiredate, title, dept_no, mgr, region, division, total_sales)
2 values ( 8,"Roger","John","E","67 H Ave","New York","NY","33822","1163","212","122-6893",10.00,"14-jun-1956","15-mar-1995","Accountant",3,1,100,10,40000);
1 row created.
SQL>
SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip, zip_4, area_code, phone, salary, birthdate, hiredate, title, dept_no, mgr, region, division, total_sales)
2 values ( 9,"Hall","Ted","R","1236 Lane","New York","NY","33823","1164","212","222-4393",13.00,"10-jun-1959","15-aug-1997","Sales Representative",3,1,100,10,50000);
1 row created.
SQL>
SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip, zip_4, area_code, phone, salary, birthdate, hiredate, title, dept_no, mgr, region, division, total_sales)
2 values ( 10,"Barbee","Candice","L","400 Street","New York","NY","33811","2009","212","321-6873",12.00,"10-oct-1964","15-jan-1999","Sales Representative",3,1,100,10,35000);
1 row created.
SQL>
SQL>
SQL>
SQL> CREATE TABLE logit( event VARCHAR2(400) );
Table created.
SQL>
SQL>
SQL> create or replace trigger tr_trans_log
2 BEFORE INSERT OR UPDATE OR DELETE ON employee
3 DECLARE
4 v_msg varchar2(200) ;
5 PRAGMA AUTONOMOUS_TRANSACTION;
6 BEGIN
7 IF inserting THEN
8 v_msg := " Insert into employee @ " || to_char(sysdate, "mm/dd/yyyy hh:mi") || " by " || user ;
9 ELSIF updating THEN
10 v_msg := " Update of employee @ " || to_char(sysdate, "mm/dd/yyyy hh:mi") || " by " || user ;
11 ELSIF deleting THEN
12 v_msg := " Delete of employee @ " || to_char(sysdate, "mm/dd/yyyy hh:mi") || " by " || user ;
13 END IF;
14 INSERT INTO logit VALUES(v_msg);
15 COMMIT;
16 END;
17 /
Trigger created.
SQL>
SQL> drop table logit;
Table dropped.
SQL>
SQL> drop table employee;
Table dropped.</source>

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в 13:45, 26 мая 2010

Admin: 1 версия