c# itextsharp datamatrix barcode Creating a Relationship in C#

Encoding DataMatrix in C# Creating a Relationship

Creating a Relationship
Make Data Matrix In C#.NET
Using Barcode maker for VS .NET Control to generate, create Data Matrix 2d barcode image in .NET applications.
www.OnBarcode.com
DataMatrix Scanner In C#.NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
We covered relationships in 3, but we ve not created any. Now we will. The first relationship that we create will be between the customer and customer transactions tables. This will be
Barcode Creation In Visual C#
Using Barcode generator for Visual Studio .NET Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Linear Drawer In Visual C#.NET
Using Barcode maker for VS .NET Control to generate, create Linear image in .NET framework applications.
www.OnBarcode.com
CHAPTER 5 DEFINING TABLES
Data Matrix ECC200 Generation In Visual C#
Using Barcode generation for .NET Control to generate, create Data Matrix ECC200 image in VS .NET applications.
www.OnBarcode.com
QR Code JIS X 0510 Creation In Visual C#.NET
Using Barcode printer for .NET framework Control to generate, create QR-Code image in Visual Studio .NET applications.
www.OnBarcode.com
a one-to-many relationship where there is one customer record to many transaction records. Keep in mind that although a customer may have several customer records, one for each product he or she has bought, the relationship is a combination of customer and product to transactions because a new CustomerId will be generated for each product the customer buys. We will now build that first relationship.
UCC - 12 Printer In C#
Using Barcode drawer for Visual Studio .NET Control to generate, create GS1 - 12 image in VS .NET applications.
www.OnBarcode.com
UPC - E0 Generator In Visual C#.NET
Using Barcode printer for .NET framework Control to generate, create UPC-E image in Visual Studio .NET applications.
www.OnBarcode.com
Try It Out: Building a Relationship
Printing Data Matrix 2d Barcode In Objective-C
Using Barcode encoder for iPhone Control to generate, create Data Matrix ECC200 image in iPhone applications.
www.OnBarcode.com
Make Data Matrix 2d Barcode In None
Using Barcode maker for Software Control to generate, create Data Matrix 2d barcode image in Software applications.
www.OnBarcode.com
1. Ensure that SQL Server Management Studio is running, and that ApressFinancial database is selected and expanded. We need to add a primary key to CustomerDetails.Customers. Enter the code that follows and then execute it: ALTER TABLE CustomerDetails.Customers ADD CONSTRAINT PK_Customers PRIMARY KEY NONCLUSTERED ( CustomerId ) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] GO 2. Find and select the TransactionDetails.Transactions table, and then right-click. Select Design Table to invoke the Table Designer. 3. Once in the Table Designer, right-click and select Relationships from the pop-up menu shown in Figure 5-18. Or click the Relationships button on the Table Designer toolbar.
PDF 417 Reader In C#
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Reading Barcode In C#.NET
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in VS .NET applications.
www.OnBarcode.com
Figure 5-18. Building a relationship 4. This brings up the relationship designer. As it s empty, you need to click Add. This will then populate the screen as shown in Figure 5-19.
Printing Barcode In .NET Framework
Using Barcode creation for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
USS Code 39 Generation In None
Using Barcode creation for Font Control to generate, create Code 39 Full ASCII image in Font applications.
www.OnBarcode.com
CHAPTER 5 DEFINING TABLES
Encode Barcode In .NET Framework
Using Barcode drawer for VS .NET Control to generate, create Barcode image in .NET framework applications.
www.OnBarcode.com
EAN / UCC - 13 Decoder In .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Figure 5-19. Foreign Key Relationships dialog box 5. Expand the Tables and Columns Specified node, which will allow the relationship to be built. Notice that there is now an ellipse button on the right, as shown in Figure 5-20. To create the relationship, click the ellipse.
Printing Code 128A In None
Using Barcode creator for Software Control to generate, create Code 128B image in Software applications.
www.OnBarcode.com
GS1 - 12 Generator In Java
Using Barcode printer for Java Control to generate, create UPC-A Supplement 2 image in Java applications.
www.OnBarcode.com
Figure 5-20. Adding tables and columns 6. The first requirement is to change the name to make it more meaningful. Quite often you will find that naming the key FK_ParentTable_ChildTable is the best method, so in this case change it to FK_Customers_Transactions as the CustomerDetails.Customers table will be the master table for this foreign key. We also need to define the column in each table that is the link. We are linking every one customer record to many transaction records and we can do so via the CustomerId. So select that column for both tables, as shown in Figure 5-21. Now click OK.
Paint Code 128 Code Set C In Java
Using Barcode encoder for Java Control to generate, create Code 128A image in Java applications.
www.OnBarcode.com
Read Barcode In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
CHAPTER 5 DEFINING TABLES
Figure 5-21. Columns selection
Note In this instance, both columns have the same name, but this is not mandatory. The only requirement
is that the information in the two columns be the same.
7. This brings us back to the Foreign Key Relationships definition screen, shown in Figure 5-22. Notice that at the top of the list items in the grayed-out area you can see the details of the foreign key we just defined. Within the Identity section there is now also a description of the foreign key. Ignore the option Enforce for Replication.
Figure 5-22. Foreign key with description
CHAPTER 5 DEFINING TABLES
8. There are three other options we are interested in that are displayed at the bottom of the dialog box, as shown in Figure 5-23. Leave the options at the defaults.
Figure 5-23. Insert and update specification 9. Closing this dialog box does not save the changes. Not until you close the Table Designer will the changes be applied. When you do so, you should see the dialog box in Figure 5-24 notifying you that two tables are to be changed. Click Yes to save the changes.
Figure 5-24. Saving changes The relationship is now built, but what about those options we left alone Let s go through those now.
Check Existing Data on Creation
If there is data within either of the tables, by setting this option to Yes we instruct SQL Server that when the time comes to physically add the relationship, the data within the tables is to be checked. If the data meets the definition of the relationship, then the relationship is successfully inserted into the table. However, if any data fails the relationship test, then the relationship is not applied to the database. An example of this would be when it is necessary to ensure that there is a customer record for all transactions, but there are customer transactions records that don t have a corresponding customer record, which would cause the relationship to fail. Obviously, if you come across this, you have a decision to make. Either correct the data by adding master records or altering the old records, and then reapply the relationship, or revisit the relationship to ensure it is what you want.
Copyright © OnBarcode.com . All rights reserved.