stored procedure,transaction
TRANSCRIPT
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Stored Procedures, Cursors and Transactions
Muhammed [email protected]/usernametwitter.com/usernamein.linkedin.com/in/profilename1234567890
Overview
• Stored Procedure• Structure of stored procedure• Cursor• Example-cursor• Transaction• Example-transaction
Stored Procedure
• A stored procedure is a set of SQL statements.
• stored in the server.• Allow for variable declarations, flow control and
other useful programming techniques.
Stored Procedure contd..
Structure of storedprocedure
CREATE PROCEDURE proc_name@parameter data typeAS BEGIN //defnition of the spEND
Example for Stored Procedure
CREATE PROCEDURE test@capital int,@rate INT,@duration INT, @interest int OUTASBegin SET @interest = (@capital * @rate * @duration)/100;end
Stored Procedure contd..
• EXEC Or EXECUTE• Example :
– EXECUTE test 100,5,2,@res;
Advantage
• Improve performance • Share logic• Reusability
Cursor
Cursor
• Cursor is used to iterate through a set of rows returned by a query and process each row.
Cursor contd..
DECLARE cursor_name CURSOR FOR SELECT_statement
OPEN cursor_name
FETCH next from cursor_name INTO variables list
CLOSE cursor_name;
Cursor contd..
Cursor Example
create procedure cur_salary
@dept_name varchar(20)
As
Begin
Declare @t_id int;
Declare @d_name varchar(10);
Declare cur_salary CURSOR FOR select id,department from tbl;
Open cur_salary;
Example contd..
FETCH next from cur_salary INTO @t_id,@d_name;
While (@@Fetch_Status = 0) Beginif d_name=dept_name
begin
Update tbl_teacher set salary=salary+500 where id=t_id;
end
Else
begin
Update tbl_teacher set salary=salary+400 where id=t_id;
End
Example contd..
FETCH next from cur_salary INTO @t_id,@d_name;
end
CLOSE cur_salary;
end
Transaction
Transaction
• A transaction is a logical unit of work that contains one or more SQL statements
• Executes as a unit.
Transaction Control
BEGIN TRANSACTION
//logics…
If error
ROLLBACK TRANSACTION
Else
COMMIT TRANSACTION
Example Transaction
create stored procedure
@ac_no1 int,
@ac_no2 int
As
BEGIN
BEGIN try
BEGIN transaction;
select balance from Account where Account_Number=ac_no1;
select balance from Account where Account_Number=ac_no2;
update Account set balance=balance-900 here Account_Number=ac_no1 ;
Example Transaction contd..
update Account set balance=balance+900 where Account_Number=ac_no2;COMMIT TRANSACTIONEND tryBEGIN CATCH ROLLBACK TRANSACTIONEND CATCHEND
ACID Property
• Atomicity• Consistent• Isolation• Durability
Thank You
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