Building a Database Diagram in Visual Studio .NET

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Building a Database Diagram
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It is sometimes useful to see a pictorial view of your database, or a portion of it That is the purpose of SQL Server s database diagram feature
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NOTE: If you are using a database product other than SQL Server, some of the database product s management tools provide database diagramming features
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Building a Database
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NOTE: If you are using SQL Server 2000 instead of SQL Server 2005, you cannot add database diagrams from within Visual Studio You must instead use Enterprise Manager to create your diagrams
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To build a database diagram for a set of SQL Server 2005 tables: 1 Right-click the Database Diagrams folder under the data connection in Server Explorer and select Add New Diagram from the context menu, or select the data connection and click Data | Add New | Diagram from the main menu bar This displays the Add Table dialog 2 Select one or more tables to include in the diagram, and click Add Then click Close The tables are added to the Database Designer Drag the tables in the Database Designer to lay out the diagram as desired The result appears similar to Figure 88
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8 BUILDING THE DATA ACCESS LAYER
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The database diagram for the Purchase Tracker sample application includes tables for customer, product, and purchase information
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Building the Data Access Layer
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Inserting Sample Data
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To test your code, you need some sample data in your tables Use the Results Pane of the Query Builder to enter sample data
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NOTE: This feature works with most database products, including SQL Server and Microsoft Access
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To enter sample data into a table: 1 Right-click the table in Server Explorer and select Show Table Data from the context menu, or click the table and select Data | Show Table Data from the main menu bar This displays the Results Pane of the Table Designer 2 Type sample data into each column
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NOTE: If you identified the ID column as an Identity or AutoNumber column, do not enter a value for the ID column The ID is assigned automatically
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After entry of sample data, the Results Pane appears similar to Figure 89
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testing
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Enter sample data into the Results Pane so that you have data to use for
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Use the techniques described in this section to enter sample data into your application You can also use these techniques to view or edit existing data in the table
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Building Stored Procedures
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For the Purchase Tracker sample application: Add sample data to the Product table using the technique described in this section The result for the Product table could look something like Figure 89 Repeat for the Customer table Repeat for the Purchase table Be sure that the ProductID and CustomerID columns in the Purchase table are valid IDs from the Product and Customer tables At this point, you have not yet added code to retrieve values from the tables, so you won t be able to see your sample data in your application yet
With the tables created, the columns de ned, and the primary keys set, the database is ready for use By entering sample data, you can more easily test the code that accesses the database
8 BUILDING THE DATA ACCESS LAYER
Building Stored Procedures
A stored procedure is a software routine that is stored in the database and run within the context of the database
NOTE: Stored procedures are supported by many database management products, such as SQL Server and Oracle Microsoft Access has QueryDefs, which are similar in concept to a stored procedure but with a slightly different syntax
Stored procedures frequently perform CRUD (create, read, update, and delete) operations on data in the database They can also perform other, more complex data operations, such as increasing the price of every product by 10% Stored procedures can take input parameters, return tabular or scalar results, and return output parameters For example, to retrieve product data for a particular product, you can build a stored procedure that de nes the ProductID as an input parameter, retrieves all the columns in the Product table for the de ned ProductID, and returns them as a tabular result To save product data, you can build a stored procedure that takes all the product columns as input parameters and updates them in the database