c# barcode generator source code WORKING WITH THE DA TA in Font

Print PDF-417 2d barcode in Font WORKING WITH THE DA TA

CHAPTER 8 WORKING WITH THE DA TA
PDF417 Encoder In None
Using Barcode generation for Font Control to generate, create PDF-417 2d barcode image in Font applications.
www.OnBarcode.com
Drawing QR Code ISO/IEC18004 In None
Using Barcode generation for Font Control to generate, create QR image in Font applications.
www.OnBarcode.com
follows will remove the erroneous record entry and reset the seed of the IDENTITY column back to 0, to a value indicating that no records have been entered. We will then reenter the customer information via T-SQL. Enter the following code, place the code into Query Editor, and execute it. The first line removes the record from CustomerDetails.Customers, and the second line resets the identity. Don t worry too much about the record deletion part, as deleting records is covered in detail later in the chapter in the Deleting Data section. DELETE FROM CustomerDetails.Customers DBCC CHECKIDENT('CustomerDetails.Customers',RESEED,0) INSERT INTO CustomerDetails.Customers (CustomerTitleId,CustomerFirstName,CustomerOtherInitials, CustomerLastName,AddressId,AccountNumber,AccountType, ClearedBalance,UnclearedBalance) VALUES (1,'Robin',NULL,'Dewson',1333, 18176111,1,200.00,2.00) INSERT INTO CustomerDetails.Customers (CustomerTitleId,CustomerLastName,CustomerFirstName, CustomerOtherInitials,AddressId,AccountNumber,AccountType, ClearedBalance,UnclearedBalance) VALUES (3,'Mason','Jack',NULL,145,53431993,1,437.97,-10.56) When the code is run, you should see the following information output to the Query Results pane: (2 row(s) affected) Checking identity information: current identity value '5', current column value '0'. DBCC execution completed. If DBCC printed error messages, contact your system administrator. (1 row(s) affected) (1 row(s) affected)
Barcode Generator In None
Using Barcode encoder for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Make UPC-A Supplement 2 In None
Using Barcode generation for Font Control to generate, create UPC A image in Font applications.
www.OnBarcode.com
Column Constraints
Creating ECC200 In None
Using Barcode generation for Font Control to generate, create ECC200 image in Font applications.
www.OnBarcode.com
Making Code 128 Code Set B In None
Using Barcode printer for Font Control to generate, create Code-128 image in Font applications.
www.OnBarcode.com
A constraint is essentially a check that SQL Server places on a column to ensure that the data to be entered in the column meets specific conditions. This will keep out data that is erroneous, and therefore avoid data inconsistencies. Constraints are used to keep database integrity by ensuring that a column only receives data within certain parameters. We have already built a constraint on the CustomerDetails.Customers table for the default value for the column DateAdded. If you go to Object Explorer, right-click, select Script Table As Create To, and put the output in a new query window, you will see the following line from that output. So a constraint is used for setting a default value. [DateAdded] [datetime] NULL CONSTRAINT [DF_Customers_DateAdded] DEFAULT (getdate()), Constraints are used to not only insert default values, but also validate data as well as primary keys. However, when using constraints within SQL Server, you do have to look at the whole picture, which is the user graphical system with the SQL Server database in the background. If you are using a constraint for data validation, some people will argue that perhaps it is better to check the values inserted within the user front-end application rather than in SQL Server. This has some merit, but what also has to be kept in mind is that you may have several points of entry to your database. This could be from the user application, a web-based solution, or other applications if you are building a central database. Many people will say that all validation, no matter what the overall picture is, should
Generate EAN / UCC - 13 In None
Using Barcode encoder for Font Control to generate, create EAN 128 image in Font applications.
www.OnBarcode.com
Generating NW-7 In None
Using Barcode creation for Font Control to generate, create Monarch image in Font applications.
www.OnBarcode.com
CHAPTER 8 WORK IN G WITH THE DA TA
PDF417 Recognizer In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
PDF-417 2d Barcode Generator In None
Using Barcode drawer for Software Control to generate, create PDF-417 2d barcode image in Software applications.
www.OnBarcode.com
always be placed in one central place, which is the SQL Server database. Then there is only one set of code to alter if anything changes. It is a difficult choice and one that you need to look at carefully. You have two ways to add a constraint to a table. You saw the first when creating a default value as we built a table via SQL Server Management Studio in 5. To build a constraint via code, you need to use the ALTER TABLE command, no matter what type of constraint this is. The ALTER TABLE command can cover many different alterations to a table, but in this instance, the example just concentrates on adding a constraint. This makes the ALTER TABLE statement easy, as the only real meat to the clause comes with the ADD CONSTRAINT syntax. The next example will work with the CustomerDetails.CustomerProducts table, and you will see three different types of constraints added, all of which will affect insertion of records. It is worth reiterating the adding of a default value constraint again, as this will differ from the DateAdded column on the CustomerDetails.Customers table. Once the constraints have been added, you will see them all in action, and how errors are generated from erroneous data input.
Barcode Creator In Java
Using Barcode generator for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
EAN / UCC - 13 Creator In VS .NET
Using Barcode creator for ASP.NET Control to generate, create UCC.EAN - 128 image in ASP.NET applications.
www.OnBarcode.com
GTIN - 128 Generation In None
Using Barcode generator for Software Control to generate, create USS-128 image in Software applications.
www.OnBarcode.com
Encoding EAN-13 In Objective-C
Using Barcode drawer for iPhone Control to generate, create EAN13 image in iPhone applications.
www.OnBarcode.com
Code128 Encoder In Visual Basic .NET
Using Barcode generator for .NET framework Control to generate, create Code 128 Code Set A image in VS .NET applications.
www.OnBarcode.com
EAN 128 Encoder In Java
Using Barcode creator for Java Control to generate, create UCC.EAN - 128 image in Java applications.
www.OnBarcode.com
Barcode Encoder In None
Using Barcode drawer for Microsoft Word Control to generate, create Barcode image in Word applications.
www.OnBarcode.com
Make USS Code 39 In VS .NET
Using Barcode printer for ASP.NET Control to generate, create Code 39 Full ASCII image in ASP.NET applications.
www.OnBarcode.com
Creating EAN / UCC - 13 In .NET Framework
Using Barcode drawer for VS .NET Control to generate, create GTIN - 13 image in .NET applications.
www.OnBarcode.com
PDF417 Reader In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.