create code 128 barcode c# Inserting data into the Employees table in C#

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Listing 14 Inserting data into the Employees table
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SELECT CURRENT_TIMESTAMP; INSERT dbo.Employees ( EmployeeID, FirstName, LastName, Salary ) SELECT 7, 'Howard',
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How does SQL Server 2008 solve these problems
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'Jones', 80000; UPDATE dbo.Employees SET LastName = 'Donaldson' WHERE EmployeeID = 3; UPDATE dbo.Employees SET Salary = Salary * 2 WHERE EmployeeID = 4; DELETE dbo.Employees WHERE EmployeeID = 6; UPDATE dbo.Employees SET LastName = 'Stern' WHERE EmployeeID = 7; UPDATE dbo.Employees SET LastName = 'Malone' WHERE EmployeeID = 3;
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Be sure to copy the result from the very first line in the query. You will need this to determine the range of LSNs you will need to pull from the CDC table. Now you can run the query in listing 15.
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Listing 15
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DECLARE @start @end @lsn_A @lsn_B SELECT @start @end = @lsn_A @lsn_B
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Query against (and results from) a change data capture function
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DATETIME, DATETIME, BINARY(10), BINARY(10); = '<plug in the value from above>', CURRENT_TIMESTAMP, = sys.fn_cdc_map_time_to_lsn('smallest greater than', @start), = sys.fn_cdc_map_time_to_lsn('largest less than', @end);
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SELECT operation = CASE __$operation WHEN 1 THEN 'D' WHEN 2 THEN 'I' WHEN 4 THEN 'U' ELSE NULL END, EmployeeID, FirstName, LastName, Salary FROM cdc.fn_cdc_get_all_changes_dbo_Employees(@lsn_A, @lsn_B, 'all'); -- result: Operation EmployeeID I 7 U 3 U 4 D 6 U 7 U 3 FirstName LastName Howard Jones Don Donaldson Teemu Selanne Kirby Quigley Howard Stern Don Malone Salary 80000.00 125000.00 227000.00 62500.00 80000.00 125000.00
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This result set does not include the before images of rows affected by UPDATE statements, because it is intended to be used to make a target data source look like the source. Hopefully you can see here that it would be easy to reconstruct all of the DML statements, in order to apply the same changes to another table that looked identical to this one before you made changes. If you change the final SELECT to use the get_net_changes function instead, as shown in listing 16, you can see that the set is compressed. Only the values necessary to make the target table look like the source (with one row per key) are included.
SQL Server Audit, change tracking, and change data capture
Listing 16
Using the get_net_changes function
SELECT operation = CASE __$operation WHEN 1 THEN 'D' WHEN 2 THEN 'I' WHEN 4 THEN 'U' ELSE NULL END, EmployeeID, FirstName, LastName, Salary FROM cdc.fn_cdc_get_net_changes_dbo_Employees(@lsn_A, @lsn_B, 'all'); -- result: Operation EmployeeID U 4 D 6 I 7 U 3
FirstName Teemu Kirby Howard Don
LastName Selanne Quigley Stern Malone
Salary 227000.00 62500.00 80000.00 125000.00
And finally, as per listing 17, you can see the before and after image of each key row throughout all updates by looking directly at the CDC table.
Listing 17 Viewing the before and after image of each key row
SELECT [image] = CASE __$operation WHEN 3 THEN 'BEFORE' WHEN 4 THEN 'AFTER' ELSE NULL END, EmployeeID, FirstName, LastName, Salary FROM cdc.dbo_Employees_CT WHERE __$operation IN (3,4) ORDER BY __$start_lsn, __$operation; -- result: Image EmployeeID FirstName BEFORE 3 Don AFTER 3 Don BEFORE 4 Teemu AFTER 4 Teemu BEFORE 7 Howard AFTER 7 Howard BEFORE 3 Don AFTER 3 Don LastName Mattingly Donaldson Selanne Selanne Jones Stern Donaldson Malone Salary 125000.00 125000.00 113500.00 227000.00 80000.00 80000.00 125000.00 125000.00
One challenge you might come across is when your schema changes. In this case you will need to disable CDC for the table and re-enable it when the change is complete. CDC will not break without this action, but if you add, remove, or rename columns, your captured data will be incomplete. Also, because change tracking and SQL Server Audit are synchronous, and CDC polls the transaction log after the fact, it is not so straightforward to capture the username responsible for the change. If this is an important part of your solution, then you are probably better off sticking to one of the other features discussed in this chapter, or resorting to more traditional means (for example, triggers, log reading utilities). To clean up the CDC settings, you can use the code in listing 18.
Comparison of features
Listing 18
Cleaning up change data capture settings
USE HR; GO EXEC sys.sp_cdc_disable_table @source_schema = N'dbo', @source_name = N'Employees', @capture_instance ='dbo_Employees'; GO EXEC sys.sp_cdc_disable_db; GO
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