create qr code vb.net Part 4: Designing an Access Project in Visual Studio .NET

Drawer USS Code 128 in Visual Studio .NET Part 4: Designing an Access Project

Part 4: Designing an Access Project
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Instead of using the Allow Nulls property to require data entry, you could create a check constraint that uses an expression like this:
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Part 00: Part Title
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Microsoft Office Access 2003 Inside Out a foreign key constraint (or relationship). The two table names identify the members of the relationship. The infinity symbol preceding the name in the Selected relationship box indicates that you are editing or creating this relationship from the table on the many side of the relationship. If you had opened the Contacts table first before beginning to define this relationship, the relationship design window would show you a primary key symbol instead. Because you are actually defining a constraint on the table on the many side of the relationship, that table name appears first in the name.
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Part 4: Designing an Access Project
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Figure 17-22. Creating a new relationship in the CompanyContacts table.
Underneath Relationship name are two drop-down lists that allow you to specify which tables are members of the relationship. By default, Access will specify the current table as the Foreign key table and the first table listed alphabetically in the table list as the Primary key table. Because you have only created three tables so far, the Companies table will be listed as the Primary key table. These are the two tables you want to use in the relationship, so you don t have to change the selected tables. If you have already created some other tables in your project, then the Companies table might not be listed as the Primary key table. If it isn t, simply select it from the drop-down list. Below the table listings are two drop-down lists that you can use to specify which columns will be members of this relationship. You want to create a one-to-many relationship between Companies and CompanyContacts. The column that they share in the relationship is the CompanyID column. To create the relationship, select CompanyID from the first drop-down list under both the Primary key table and the Foreign key table. After you have selected the columns you want for this relationship, you need to specify a few more options before you save the table and this new relationship. When you select Check existing data on creation, SQL Server will examine the data in the existing tables and make sure that none of it violates the constraints of the relationship. If SQL Server finds any problems, it displays an error when you try to save the table, and the save operation will fail. Choosing this option is a good idea for any relationship you create, because it ensures that no 630
Part 1: Part Title
Building Tables in an Access Project integrity problems exist with the current data in the tables. If you already have any data in your tables, make sure you select the Check existing data on creation option. Selecting Enforce relationship for replication makes sure that the foreign key constraint (the relationship) is copied to any replicated databases. For now, you can leave the Enforce relationship for replication option unselected. The next option, Enforce relationship for INSERTs and UPDATEs, allows you to enforce referential integrity for this relationship, ensuring that any added or updated data does not violate the constraint of the relationship. If you select Enforce relationship for INSERTs and UPDATEs, you also have the option of choosing Cascade Update Related Fields and/or Cascade Delete Related Records. These two options allow you to control what happens to data in related rows when data in the table containing the primary key changes. If you choose Cascade Update Related Fields, whenever data in the primary key columns is updated, any related data in the foreign key of the related table is also updated. If you choose Cascade Delete Related Records, whenever a row in the table containing the primary key is deleted, all related rows in the table containing the foreign key are also deleted. You should carefully consider selecting Cascade Delete Related Records because choosing this option will always delete foreign rows when you delete any rows in your primary key table. For this relationship, make sure that you leave Enforce relationship for INSERTs and UPDATEs selected. Also, place a check mark in Cascade Update Related Fields so that any changes to the primary key will be propagated to the related tables. Leave the option for Cascade Delete Related records blank. When you are done creating the relationship between the Company table and the Company Contacts table, your Properties window should look like the one shown in Figure 17-23 on the next page. If you need to add additional relationships, click the New button. You can also delete a relationship by choosing it from the Selected relationship drop-down list and then clicking the Delete button. Be sure to save your table to save the changes you made to relationships.
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