I am tying to complete my assignment but i am facing some problem so i need your help
I have craeted a table name client contain 6 columns name(c_id,c_name,c_transfer,c_balance,day,time) now the assignment is that i have to create a trigger in which is day column contain Satauarday and Sunday it prints Sorry Bank closed and if time column contain 05:00 to 09:00 it will inserted but if the time is not reguarding the condition row cant inserted.
The codes are as follows:
create table client
(
c_id int identity primary key,
c_name varchar(50),
c_transfer money,
c_balance money,
[date] datetime,
[day] varchar(50),
)
alter trigger transactions
ON client
for Insert
as
begin
if(select top 1 [day] from client order by c_id desc)='Satuarday'
begin
print'Sorry Bank is closed today'
rollback;
commit;
end
if(select top 1 [day] from client order by c_id desc)= 'Sunday'
begin
print'Sorry Bank is closed today'
rollback;
commit;
end
if(select top 1 date from client order by c_id desc)not in (DATEDIFF(hh,'09:00','05:00'))
begin
print'Sorry Bank time is not this...'
rollback;
commit;
end
end
What you are looking for is the Inserted table. This table can be used inside a FOR INSERT trigger and contains the row that is being inserted.
GO
CREATE TRIGGER transactions
ON client
FOR INSERT AS
BEGIN
IF EXISTS(SELECT [day] FROM inserted
WHERE ([day] IN ('saturday', 'sunday'))
OR (DATEPART(hh,[date]) <= 5) OR DATEPART(hh,[date]) >= 9)
BEGIN
PRINT'Sorry Bank is closed at this time.'
ROLLBACK;
END;
END;
Related
here's the value of ACCOUNT_NUMBER that has been generated by a sequence and inserted in ACCOUNTS table by ACCOUNT_NUMBER_TRIG trigger that i need to insert it into the TRANSACTION TABLE by the trigger ACCOUNTS_TRANSCATION_TRIG_1
CREATE OR REPLACE TRIGGER ACCOUNT_NUMBER_TRIG
BEFORE INSERT
ON ACCOUNTS
FOR EACH ROW
WHEN (NEW.ACCOUNT_NUMBER is not null)
DECLARE
V_ACC_NO ACCOUNTS.ACCOUNT_NUMBER%TYPE;
BEGIN
SELECT ACCOUNT_NO_SEQ.nextvaL INTO V_ACC_NO FROM DUAL;
:NEW.ACCOUNT_NUMBER := V_ACC_NO;
END ACCOUNT_NUMBER_TRIG;
------------------------------------------------------------------------------
CREATE OR REPLACE TRIGGER ACCOUNTS_TRANSCATION_TRIG_1 AFTER
INSERT ON ACCOUNTS FOR EACH ROW DECLARE CURSOR ACCOUNTS_CUR IS
SELECT ACCOUNT_NUMBER FROM ACCOUNTS;
DECLARE
TEMP_1 NUMBER(5,0);
BEGIN
SELECT ACCOUNTS.ACCOUNT_NUMBER FROM INSERTED INTO TEMP_1
OPEN ACCOUNTS_CUR;
INSERT
INTO TRANSACTIONS VALUES
(
SYSDATE,
- :NEW.ACCOUNT_NUMBER,
'NEW ACCOUNT',
0
);
CLOSE ACCOUNTS_CUR;
END ACCOUNTS_TRANSCATION_TRIG_1;
CREATE TABLE accounts(
ACCOUNT_NUMBER number,
ACCOUNT_NAME varchar2(20)
);
CREATE SEQUENCE ACCOUNT_NO_SEQ;
CREATE OR REPLACE TRIGGER ACCOUNT_NUMBER_TRIG
BEFORE INSERT
ON ACCOUNTS
FOR EACH ROW
WHEN (NEW.ACCOUNT_NUMBER is not null)
BEGIN
:NEW.ACCOUNT_NUMBER :=ACCOUNT_NO_SEQ.nextvaL;
END ACCOUNT_NUMBER_TRIG;
/
CREATE TABLE transactions(
TR_DATE date,
TR_ACCOUNT_NUMBER number,
TR_TYPE varchar2(20),
TR_somenumber int
);
CREATE OR REPLACE TRIGGER ACCOUNTS_TRANSCATION_TRIG_1 AFTER
INSERT ON ACCOUNTS FOR EACH ROW
BEGIN
INSERT INTO TRANSACTIONS( TR_DATE, TR_ACCOUNT_NUMBER, TR_TYPE, TR_somenumber )
VALUES
(
SYSDATE,
:NEW.ACCOUNT_NUMBER,
'NEW ACCOUNT',
0
);
END ACCOUNTS_TRANSCATION_TRIG_1;
/
INSERT INTO accounts( ACCOUNT_NUMBER, ACCOUNT_NAME ) VALUES (1111,'My Name' );
select * from accounts;
ACCOUNT_NUMBER ACCOUNT_NAME
-------------- --------------------
2 My Name
select * from transactions;
TR_DATE TR_ACCOUNT_NUMBER TR_TYPE TR_SOMENUMBER
---------- ----------------- -------------------- -------------
2017/07/11 2 NEW ACCOUNT 0
You can use CURVAL to get the most recent value returned by NEXTVAL:
CREATE OR REPLACE TRIGGER ACCOUNTS_TRANSCATION_TRIG_1 AFTER
INSERT ON ACCOUNTS FOR EACH ROW DECLARE CURSOR ACCOUNTS_CUR IS
BEGIN
INSERT
INTO TRANSACTIONS VALUES
(
SYSDATE,
- ACCOUNT_NO_SEQ.curval,
'NEW ACCOUNT',
0
);
CLOSE ACCOUNTS_CUR;
END ACCOUNTS_TRANSCATION_TRIG_1;
However in this case there is no need, as it has been used to set the ACOUNT_NUMBER:
INSERT
INTO TRANSACTIONS VALUES
(
SYSDATE,
- :NEW.ACCOUNT_NUMBER,
'NEW ACCOUNT',
0
);
BTW unless you are on an old version of Oracle this should work for first trigger:
CREATE OR REPLACE TRIGGER ACCOUNT_NUMBER_TRIG
BEFORE INSERT
ON ACCOUNTS
FOR EACH ROW
WHEN (NEW.ACCOUNT_NUMBER is not null)
BEGIN
:NEW.ACCOUNT_NUMBER := ACCOUNT_NO_SEQ.nextvaL;
END ACCOUNT_NUMBER_TRIG;
(I suspect the WHEN clause is wrong - should be when is null?)
Hello for hobby purposes i am trying to create a C# application with a MS SQL Server database which reassembles a hotel system. I am now trying to create a SQL trigger which calculates a datedifference. A reservation may not be longer than 6 weeks(42 days). However, my trigger goes off even when placing reservations which have a datedifference lower than 42 days, even if the difference is 1 day. so I am not sure what I am doing wrong.
My trigger:
create trigger trigger_reservation
on reservation
after update, insert
as
if exists
(
select reservationid, DATEDIFF(dd,Startdate,Enddate)
from reservation
group by reservationid, enddate, startdate
having DATEDIFF(dd,Startdate,Enddate) > 42
)
begin
raiserror('Error: Reservation may not be longer than 6 weeks',16, 1)
rollback transaction
end
Triggers are expensive to run and maintain. This type of check can be accomplished by a simple CHECK CONSTRAINT
CREATE TABLE reservation (
reservationid INT,
startdate DATE,
enddate DATE,
-- ...
CONSTRAINT reservation_dates_ck
CHECK(DATEDIFF(dd, startdate, enddate) < 43)
)
Here is a dbfiddle demo
And here's how you go about doing it with a trigger
CREATE TRIGGER trigger_reservation
ON reservation AFTER UPDATE, INSERT
AS
IF EXISTS (
SELECT *
FROM inserted
WHERE DATEDIFF(dd, startdate, enddate) > 42
)
BEGIN
RAISERROR ('Error: Reservation may not be longer than 6 weeks', 16, 1);
ROLLBACK TRANSACTION;
RETURN
END;
Here is a dbfiddle demo
I have a small little thing with SQL that's been bothering me now for a while, let's say I have two tables (Customer and Loan). However, I want a trigger that's checking based on the Borrowertype attribute. I suppose with the second query after AND I need something to check whether the userID in Loans are the same as the one in Customer, but must be messing it up or I'm completely thinking this the wrong way.
CREATE TABLE Customer
(
userID int identity primary key,
Name varchar(20),
Borrowertype varchar(20)
);
CREATE TABLE Loan
(
Id int identity primary key,
userID int,
FOREIGN KEY (userID) REFERENCES Customer(userID)
);
IF OBJECT_ID ('Customer.maximum_books_per_user','TR') IS NOT NULL
DROP TRIGGER Customer.maximum_books_per_user;
GO
CREATE TRIGGER maximum_books_per_user ON Customer
AFTER INSERT
AS
IF (SELECT Borrowertype FROM Customer) = 'diffborrowertypehere'
AND (SELECT COUNT(*) FROM inserted AS i JOIN Customer AS c
ON ??? WHERE ???
) > 5
BEGIN
ROLLBACK TRANSACTION
RAISERROR('You have reached maximum allowed loans.', 16, 1)
END
GO
Your trigger needs to be on the Loan table, as that's where a row would be being inserted that could be rejected. Something like this:
EDIT: rewritten to handle inserts for multiple Customers at once
CREATE TRIGGER maximum_books_per_user ON Loan
FOR INSERT
AS
-- Fail if there are any customers that will have more than the maximum number of loans
IF EXISTS (
SELECT i.userID, COUNT(*)
FROM inserted i
JOIN Loan l
ON i.userID = l.userID
GROUP BY i.userID
HAVING COUNT(*) >= 5
)
BEGIN
ROLLBACK TRANSACTION
RAISERROR('You have reached maximum allowed loans.', 16, 1)
END
what i want to achieve is i have a table called orders.
i want to perform the before insert trigger on my orders table.i want to capture the
username of person performing INSERT into table.
one table called info which contain the user.
this is my code
create table orders
(
order_id int,
quantity int,
cost int,
total_cost int,
created_date datetime,
created_by varchar(20)
)
create trigger beforeInsertdata
before insert
on orders
for each row
declare
v_username varchar2(10);
begin
-- Find username of person performing INSERT into table
SELECT user INTO v_username
FROM info;
-- Update create_date field to current system date
:new.create_date := sysdate;
-- Update created_by field to the username of the person performing the INSERT
:new.created_by := v_username;
END;
--user information--
create table info
(
userid int ,
user_name varchar(10)
)
insert into info values(1,'vivek')
select * from info
Basically, triggers are classified into two main types:-
1)After Triggers (For Triggers)
2)Instead Of Triggers
and the syntax for trigger is
CREATE TRIGGER trigger_name ON table_name
[FOR|AFTER|INSTEAD OF] [INSERT|UPDATE|DELETE]
AS
//your code goes here
GO
NOTE : FOR keyword used for INSERT |UPDATE Command where as AFTER USED FOR DELETE Command.
It's hard to tell what you're really trying to do. I've modified your code sample so that it will work on SQL2K5 and made some assumptions about how you're wanting to use the connected user account.
CREATE TABLE orders (
order_id int,
quantity int,
cost int,
total_cost int,
created_date datetime,
created_by varchar(20)
);
CREATE TABLE info (
userid int,
user_name varchar(10)
);
INSERT INTO info
VALUES (1, 'vivek');
SELECT *
FROM info;
CREATE TRIGGER orders_InsteadOfInsert ON orders
INSTEAD OF INSERT AS BEGIN
SET NOCOUNT ON;
-- varchar(10) is to match your table, but probably should be larger
DECLARE #CurrentUser VarChar(10);
SELECT #CurrentUser = SYSTEM_USER;
IF (#CurrentUser NOT IN (SELECT user_name FROM info)) BEGIN
-- consider using an identity column for the key instead of this
INSERT INTO info (userid, user_name)
SELECT
ISNULL((SELECT MAX(userid) FROM info), 0) + 1,
#CurrentUser;
END;
INSERT INTO orders (order_id, quantity, cost, total_cost, created_date, created_by)
SELECT
INS.order_id,
INS.quantity,
INS.cost,
INS.total_cost,
GETDATE(),
#CurrentUser
FROM INSERTED INS;
END;
I'm trying to execute the following trigger:
create trigger t23
on studies
after insert, update, delete
as
begin
REFERENCING NEW ROW NewStudent
FOR EACH ROW
WHEN (30 <= (SELECT SUM(credits) FROM Studies)
DELETE FROM NewStudent N
WHERE N.spnr = NewStudent.spnr
end
I'm trying to create a trigger which only inserts a student if the credits is < or == to '30'. The "Credits" is a type int.
I'm getting numerous errors trying to implement this trigger. I really have tried everything and i m out of options. Could someone who is expert in the field point me in the right direction?
The example "Using a DML AFTER trigger to enforce a business rule between the PurchaseOrderHeader and Vendor tables" in the CREATE TRIGGER MSDN documentation does exaclty what you're looking for:
USE AdventureWorks2008R2;
GO
IF OBJECT_ID ('Purchasing.LowCredit','TR') IS NOT NULL
DROP TRIGGER Purchasing.LowCredit;
GO
-- This trigger prevents a row from being inserted in the Purchasing.PurchaseOrderHeader table
-- when the credit rating of the specified vendor is set to 5 (below average).
CREATE TRIGGER Purchasing.LowCredit ON Purchasing.PurchaseOrderHeader
AFTER INSERT
AS
DECLARE #creditrating tinyint, #vendorid int;
IF EXISTS (SELECT *
FROM Purchasing.PurchaseOrderHeader p
JOIN inserted AS i
ON p.PurchaseOrderID = i.PurchaseOrderID
JOIN Purchasing.Vendor AS v
ON v.BusinessEntityID = p.VendorID
WHERE v.CreditRating = 5
)
BEGIN
RAISERROR ('This vendor''s credit rating is too low to accept new purchase orders.', 16, 1);
ROLLBACK TRANSACTION;
RETURN
END;
The key here is ROLLBACK TRANSACTION, just adapt the example to suit your need and you're done.
Edit: This should accomplish what you're looking for, but I have not tested it so your mileage may vary.
create trigger dbo.something after insert as
begin
if exists ( select * from inserted where sum(credits) > 30 )
begin
rollback transaction
raiserror ('some message', 16, 1)
end
end
Another edit, based on some assumptions (please note I wrote this script on the fly since I can't test it right now):
create table dbo.students
(
student_id int not null,
name varchar (50) not null
)
create table dbo.courses
(
course_id int not null,
name varchar (50) not null,
required_credits int not null
)
create table dbo.results
(
student_id int not null,
course_id int not null,
course_result int not null
)
create trigger dbo.check_student_results on dbo.results after insert as
(
declare #check int
select #check = count(*)
from inserted as a
join dbo.courses as b on b.course_id = a.course_id
where b.required_credits > a.course.result
if #check <> 0
begin
rollback transaction
raiserror('The student did not pass the course.', 16, 1)
end
)
This way when you insert records in the dbo.results table the constraint checks if the student has passed the course, and cancels the insertion if appropriate. However, it's better to check this things in the application layer.