School Commit Init

Anul 2/Semestrul 2/DBMS/Lab 3 Gwent/Deadlock1.sql

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+begin tran
+update Cards set name = 'CardTest3' where hmy=1260
+waitfor delay '00:00:05'
+update Cards set name = 'CardTest4' where hmy=1261
+commit
+
+set tran isolation level serializable
+
+insert into Cards(name, faction, description, action, image, cost, type, power, color, cardset) values ('CardTest1',1,'Test card 1','Test action 1','Test image 1',1,'Unit',1,'Bronze',1);
+insert into Cards(name, faction, description, action, image, cost, type, power, color, cardset) values ('CardTest2',2,'Test card 2','Test action 2','Test image 2',2,'special',2,'gold',2);
+select * from Cards where name like 'CardTest%';
+
+delete from Cards where name like 'CardTest%';
+update Cards set name = 'CardTest1' where hmy=1248
+update Cards set name = 'CardTest2' where hmy=1249

Anul 2/Semestrul 2/DBMS/Lab 3 Gwent/Deadlock2.sql

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+begin tran
+update Cards set name = 'CardTest4' where hmy=1261
+waitfor delay '00:00:05'
+update Cards set name = 'CardTest3' where hmy=1260
+commit

Anul 2/Semestrul 2/DBMS/Lab 3 Gwent/DirtyReads1.sql

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+create or alter procedure write_and_rollback
+as
+begin
+	begin tran
+	update Cards set name = 'Test Dirty Reads' where hmy = 1
+	waitfor delay '00:00:05'
+	rollback tran
+end
+go
+
+create or alter procedure read_multiple_times
+as
+begin
+	begin tran
+	select * from Cards where hmy = 1
+	waitfor delay '00:00:05'
+	select * from Cards where hmy = 1
+	waitfor delay '00:00:05'
+	select * from Cards where hmy = 1
+	commit tran
+end
+go
+
+set transaction isolation level read uncommitted
+
+exec read_multiple_times

Anul 2/Semestrul 2/DBMS/Lab 3 Gwent/DirtyReads2.sql

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+exec write_and_rollback	

Anul 2/Semestrul 2/DBMS/Lab 3 Gwent/Lab 3.sql

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+
+-- This script creates a stored procedure that inserts data into the Players, Cards and Decks tables.
+-- The procedure is wrapped in a transaction and uses a try-catch block to ensure that all inserts are successful or none are. 
+-- If an error occurs, the transaction is rolled back and no data is inserted. 
+
+create or alter procedure all_or_nothing_insert
+as
+begin
+	set nocount on
+    declare @player1 int, @player2 int, @card1 int, @card2 int
+	begin transaction
+		begin try
+			insert into Players(name, totalMatches, totalWins, totalLosses, totalDraws, reward_points, scraps, ores, meteorite_powder, rank) values ('PlayerTest1',10,5,3,2,100,100,100,100,1);
+			insert into Players(name, totalMatches, totalWins, totalLosses, totalDraws, reward_points, scraps, ores, meteorite_powder, rank) values ('PlayerTest2',20,10,6,4,200,200,200,200,2);
+
+            insert into Cards(name, faction, description, action, image, cost, type, power, color, cardset) values ('CardTest1',1,'Test card 1','Test action 1','Test image 1',1,'Unit',1,'Bronze',1);
+            insert into Cards(name, faction, description, action, image, cost, type, power, color, cardset) values ('CardTest2',2,'Test card 2','Test action 2','Test image 2',2,'special',2,'gold',2);
+			
+            set @player1 = (select hmy from Players where name = 'PlayerTest1');
+            set @player2 = (select hmy from Players where name = 'PlayerTest2');
+            set @card1 = (select hmy from Cards where name = 'CardTest1');
+            set @card2 = (select hmy from Cards where name = 'CardTest2');
+
+            insert into CardsOwnership(hPlayer, hCard, nrOfCards, nrOfPremiumCards) values (@player1, @card1, 1, 1);
+            insert into CardsOwnership(hPlayer, hCard, nrOfCards, nrOfPremiumCards) values (@player2, @card2, 1, 1);
+
+
+			commit transaction
+			print 'All inserts succeeded'
+		end try
+		begin catch
+			rollback transaction
+		end catch
+end
+go
+exec all_or_nothing_insert
+go
+
+-- This script creates a stored procedure that inserts data into the Players, Cards and Decks tables.
+-- The procedure is wrapped in a transaction and uses savepoints to ensure that if an error occurs, only the failed insert is rolled back.
+-- The procedure also uses a try-catch block to handle errors and print messages to the console.
+
+create or alter procedure partial_insert
+as
+begin
+	set nocount on
+	declare @player1 int, @player2 int, @card1 int, @card2 int, @savepoint1 int, @savepoint2 int
+	set @savepoint1 = 1
+	set @savepoint2 = 1
+
+	begin transaction
+	begin try
+		insert into Players(name, totalMatches, totalWins, totalLosses, totalDraws, reward_points, scraps, ores, meteorite_powder, rank) values ('PlayerTest1',10,5,3,2,100,100,100,100,1);
+		insert into Players(name, totalMatches, totalWins, totalLosses, totalDraws, reward_points, scraps, ores, meteorite_powder, rank) values ('PlayerTest2',20,10,6,4,200,200,200,200,2);
+		save transaction InsertPlayers
+		set @savepoint1 = 0
+
+		insert into Cards(name, faction, description, action, image, cost, type, power, color, cardset) values ('CardTest1',1,'Test card 1','Test action 1','Test image 1',1,'Unit',1,'Bronze',1);
+        insert into Cards(name, faction, description, action, image, cost, type, power, color, cardset) values ('CardTest2',2,'Test card 2','Test action 2','Test image 2',2,'special',2,'gold',2);
+		save transaction InsertCards
+		set @savepoint2 = 0
+
+		set @player1 = (select hmy from Players where name = 'PlayerTest1');
+		set @player2 = (select hmy from Players where name = 'PlayerTest2');
+		set @card1 = (select hmy from Cards where name = 'CardTest1');
+		set @card2 = (select hmy from Cards where name = 'CardTest2');
+		
+		insert into CardsOwnership(hPlayer, hCard, nrOfCards, nrOfPremiumCards) values (@player1, @card1, 1, 1);
+        insert into CardsOwnership(hPlayer, hCard, nrOfCards, nrOfPremiumCards) values (@player2, @card2, 1, 1);
+		
+		commit transaction
+		print 'All inserts succeeded'
+	end try
+	begin catch
+		if @@TRANCOUNT > 0
+		begin
+			if @savepoint1 = 1
+			begin
+				print 'Players insert failed'
+				rollback tran
+				print error_message()
+			end
+			else if @savepoint2 = 1
+			begin
+				print 'Cards insert failed'
+				rollback tran InsertPlayers
+				print error_message()
+				commit tran
+			end
+			else
+			begin
+				print 'CardsOwnership insert failed'
+				print error_message()
+				rollback tran InsertCards
+				commit tran
+			end
+		end
+		else
+			print error_message()
+	end catch
+end
+go
+exec partial_insert
+
+-- This script deletes all the inserted data from the Players, Cards and Decks tables.
+
+go
+create or alter proc delete_added
+as
+begin
+	begin try
+	declare @player1 int, @player2 int, @card1 int, @card2 int, @cardOwnership1 int, @cardOwnership2 int
+	set @player1 = (select hmy from Players where name = 'PlayerTest1');
+	set @player2 = (select hmy from Players where name = 'PlayerTest2');
+	set @card1 = (select hmy from Cards where name = 'CardTest1');
+	set @card2 = (select hmy from Cards where name = 'CardTest2');
+	if @player1 is not null and @player2 is not null and @card1 is not null and @card2 is not null
+		begin
+					delete from CardsOwnership where hCard = @card1 and hPlayer = @player1
+					delete from CardsOwnership where hCard = @card2 and hPlayer = @player2
+		end
+	if @card1 is not null and @card2 is not null
+		begin
+			delete from Cards where hmy = @card1
+			delete from Cards where hmy = @card2
+		end
+	if @player1 is not null and @player2 is not null
+		begin
+			delete from Players where hmy = @player1
+			delete from Players where hmy = @player2
+		end
+	end try
+	begin catch
+		print error_message()
+		delete from Cards where name = 'CardTest1'
+		delete from Cards where name = 'CardTest2'
+		delete from Players where name = 'PlayerTest1'
+		delete from Players where name = 'PlayerTest2'
+	end catch
+end
+go
+exec delete_added

Anul 2/Semestrul 2/DBMS/Lab 3 Gwent/PhantomReads1.sql

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+begin tran
+select * from Cards where name like 'CardTest%'
+waitfor delay '00:00:03'
+select * from Cards where name like 'CardTest%'
+commit tran
+
+
+set transaction isolation level repeatable read

Anul 2/Semestrul 2/DBMS/Lab 3 Gwent/PhantomReads2.sql

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+begin tran
+insert into Cards(name, faction, description, action, image, cost, type, power, color, cardset) values ('CardTest2',2,'Test card 2','Test action 2','Test image 2',2,'special',2,'gold',2);
+waitfor delay '00:00:05'
+commit tran
+
+insert into Cards(name, faction, description, action, image, cost, type, power, color, cardset) values ('CardTest1',1,'Test card 1','Test action 1','Test image 1',1,'Unit',1,'Bronze',1);
+insert into Cards(name, faction, description, action, image, cost, type, power, color, cardset) values ('CardTest2',2,'Test card 2','Test action 2','Test image 2',2,'special',2,'gold',2);
+
+delete from Cards where name = 'CardTest2';
+
+delete from Cards where name like 'CardTest%';

Anul 2/Semestrul 2/DBMS/Lab 3 Gwent/UnrepeatableReads1.sql

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+begin tran
+select * from Cards where hmy = 1
+waitfor delay '00:00:03'
+select * from Cards where hmy = 1
+commit tran
+
+set transaction isolation level read committed

Anul 2/Semestrul 2/DBMS/Lab 3 Gwent/UnrepeatableReads2.sql

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+begin tran
+update Cards set name = 'Test unrepetable reads' where hmy = 1
+waitfor delay '00:00:05'
+commit tran