c# barcode generator source code Try It Out: Altering a Table for a Default Value in Query Editor in Visual C#.NET

Generation ECC200 in Visual C#.NET Try It Out: Altering a Table for a Default Value in Query Editor

Try It Out: Altering a Table for a Default Value in Query Editor
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1. Ensure that Query Editor is running. Although all the examples deal with the CustomerDetails. CustomerProducts table, each constraint being added to the table will be created one at a time, which will allow a discussion for each point to take place. In the Query Editor pane, enter the following code, which will add a primary key to the CustomerProducts table. This will place the CustomerFinancialProductId column within the key, which will be clustered. USE ApressFinancial GO ALTER TABLE CustomerDetails.CustomerProducts ADD CONSTRAINT PK_CustomerProducts PRIMARY KEY CLUSTERED (CustomerFinancialProductId) ON [PRIMARY] GO
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CHAPTER 8 WORKING WITH THE DATA
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2. Next we add a CHECK constraint on the AmountToCollect column. The CustomerDetails. CustomerProducts table is once again altered, and a new constraint added called CK_CustProds_AmtCheck. This constraint will ensure that for all records inserted into the CustomerDetails.CustomerProducts table from this point on, the score must be greater than 0. Notice as well that the NOCHECK option is mentioned, detailing that any records already inserted will not be checked for this constraint. If they have invalid data, which they don t, then the constraint would ignore them and still be added. ALTER TABLE CustomerDetails.CustomerProducts WITH NOCHECK ADD CONSTRAINT CK_CustProds_AmtCheck CHECK ((AmountToCollect > 0)) GO 3. Moving on to the third constraint to add to the CustomerDetails.CustomerProducts table, we have a DEFAULT value constraint. In other words, this will insert a value of 0 to the Renewable column if no value is entered specifically into this column. This signifies that the premium collected is a one-off collection. ALTER TABLE CustomerDetails.CustomerProducts WITH NOCHECK ADD CONSTRAINT DF_CustProd_Renewable DEFAULT (0) FOR Renewable 4. Execute the three batches of work by pressing F5 or Ctrl+E, or clicking the execute button on the toolbar. You should then see the following result:
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The command(s) completed successfully. 5. There are two methods to check that the code has worked before adding in any data. Move to the Object Explorer in Query Editor. This isn t refreshed automatically, so you do need to refresh it. You should then see the three new constraints added, two under the Constraints node and one under the Keys node, as well as a display change in the Columns node, as shown in Figure 8-8.
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Figure 8-8. CustomerDetails.CustomerProducts table details
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CHAPTER 8 WORKING WITH THE DATA
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6. Another method is to move to SQL Server Management Studio, find the CustomerDetails. CustomerProducts table, right-click it, and select Modify. This brings us into the Table Designer, where we can navigate to the necessary column to check out the default value, in this case Renewable. Also notice the yellow key against the CustomerFinancialProductId signifying that this is now a primary key, as shown in Figure 8-9.
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Figure 8-9. Default value constraint on column Renewable 7. Move to the Table Designer toolbar and click the Manage Check Constraints button, shown here:
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8. This will display the Check Constraints dialog box, shown in Figure 8-10, where we will see the AmountToCollect column constraint displayed. We can add a further constraint by clicking the Add button. Do so now. 9. This will alter the Check Constraints dialog box to allow a new check constraint to be added, as you see in Figure 8-11. This check will ensure that the LastCollection date is greater than the value entered in another column. Here we want to ensure that the LastCollection date is equal to or after the LastCollected date. Recall that LastCollection defines when we last took the payment, and LastCollected defines when the last payment should be taken.
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CHAPTER 8 WORKING WITH THE DATA
Figure 8-10. Check Constraints dialog box
Figure 8-11. Adding a new constraint in the Check Constraints dialog box 10. The expression we want to add, which is the test the constraint is to perform, is not a value nor a system function like GETDATE(), but a test between two columns from a table, albeit the same table we are working with. This is as simple as naming the columns and the test you wish to perform. Also at the same time, change the name of the constraint to something meaningful. Your check constraint should look something like what appears in Figure 8-12. Afterwards, click Close, which will add the constraint to the list, although it has not yet been added to the table. It is not until the table is closed that this will happen, so do that now.
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