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DECLARE @app AS VARCHAR(10), @prevapp AS VARCHAR (10), @ts AS datetime, @event_type AS INT, @concurrent AS INT, @mx AS INT; DECLARE @Result AS TABLE(app VARCHAR(10), mx INT); DECLARE C CURSOR FAST_FORWARD FOR SELECT app, starttime AS ts, 1 AS event_type FROM dbo.Sessions UNION ALL SELECT app, endtime, -1 FROM dbo.Sessions ORDER BY app, ts, event_type; OPEN C; FETCH NEXT FROM C INTO @app, @ts, @event_type; SELECT @prevapp = @app, @concurrent = 0, @mx = 0; WHILE @@fetch_status = 0 BEGIN IF @app <> @prevapp BEGIN INSERT INTO @Result VALUES(@prevapp, @mx); SELECT @prevapp = @app, @concurrent = 0, @mx = 0; END SET @concurrent = @concurrent + @event_type; IF @concurrent > @mx SET @mx = @concurrent;

PRINT 'Before TRY/CATCH block.'; BEGIN TRY PRINT ' Entering TRY block.';

[ action = menu ] service() getInstance()

INSERT INTO dbo.Employees(empid, empname, mgrid) VALUES(2, 'Emp2', 1); -- Also try with empid = 0, 'A', NULL

PRINT ' PRINT ' END TRY BEGIN CATCH PRINT '

After INSERT.'; Exiting TRY block.';

getMenu()

Entering CATCH block.';

Definition The first WLAN standard created by the Institute of Electrical and Electronics Engineers (IEEE) in 1997. Second extension of the 802.11 standard developed by IEEE. Supports bandwidth up to 54 Mbps and signals in a regulated 5 GHz range.

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IF ERROR_NUMBER() = 2627 BEGIN PRINT ' Handling PK violation...'; END ELSE IF ERROR_NUMBER() = 547 BEGIN PRINT ' Handling CHECK/FK constraint violation...'; END ELSE IF ERROR_NUMBER() = 515 BEGIN PRINT ' Handling NULL violation...'; END ELSE IF ERROR_NUMBER() = 245 BEGIN PRINT ' Handling conversion error...'; END ELSE BEGIN PRINT ' Handling unknown error...'; END PRINT PRINT PRINT PRINT PRINT PRINT ' ' ' ' ' ' Error Error Error Error Error Error Number : Message : Severity: State : Line : Proc : ' ' ' ' ' ' + + + + + + CAST(ERROR_NUMBER() AS VARCHAR(10)); ERROR_MESSAGE(); CAST(ERROR_SEVERITY() AS VARCHAR(10)); CAST(ERROR_STATE() AS VARCHAR(10)); CAST(ERROR_LINE() AS VARCHAR(10)); ISNULL(ERROR_PROCEDURE(), 'Not within proc');

Exiting CATCH block.';

[ action = detail ] [ machine = amaya ] service()

PRINT 'After TRY/CATCH block.';

The code inserts a valid row into the Employees table and should not generate an error . It prints messages in key locations of the code so that you will be able to easily figure out from the output which sections of the code were reached . Upon encountering an error in the TRY block, control is passed to the CATCH block . The CATCH block examines the return value of the ERROR_NUMBER() function to determine a course of action . It then just prints the values from the different functions to return information about the error .

to encapsulate this code in a stored procedure and call that procedure from the CATCH block . What s interesting is that you don t need to pass error information to the stored procedure as input parameters . As long as the procedure is invoked within the CATCH block, it has access to all the error functions .

[ action = update ] [ machine = amaya] service()

The first time you invoke the code in Listing 6-2, it should cause no error and produce the following output, which indicates that the CATCH block was not reached at all:

Before TRY/CATCH block. Entering TRY block. After INSERT. Exiting TRY block. After TRY/CATCH block.

Next, run the code again . It causes a primary key violation error, of course, producing the following output:

Before TRY/CATCH block. Entering TRY block. Entering CATCH block. Handling PK violation... Error Number : 2627 Error Message : Violation of PRIMARY KEY constraint 'PK_Employees'. Cannot insert duplicate key in object 'dbo.Employees'. Error Severity: 14 Error State : 1 Error Line : 7 Error Proc : Not within proc Exiting CATCH block. After TRY/CATCH block.

getInstance()

Similarly, you can try different errors by specifying 0, A , NULL in the empid column, as suggested in the comment following the INSERT statement .

When you re not using the TRY/CATCH construct and an error happens in an explicit transaction, your session can end up in one of two possible transaction states: active and committable transaction, or no open transaction . When you do use TRY/CATCH, your session can end up in a third transaction state called failed, also informally referred to as doomed . In this state, the transaction is open (still holding all locks), but it is uncommittable, that is, the transaction cannot submit any code that causes writes to the transaction log . In other words, the transaction cannot modify data; rather, it can only read data . Before you apply any modification, you have to first roll back the failed transaction .

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