make barcode with vb.net 20: ADO.NET and Relational Databases in C#

Making Code 128 in C# 20: ADO.NET and Relational Databases

20: ADO.NET and Relational Databases
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Next, open a command-line window: on Windows XP and older versions, select Start Run, and type cmd in the Run dialog box. On Vista, simply click Start, then type cmd and press Enter. A command window will open. Change to the directory where the databases are stored:
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cd c:\SQL Server 2000 Sample Databases
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Then enter this command (all on one line):
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sqlcmd -E -S.\sqlexpress -i instnwnd.sql
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If you ve done it correctly, you should see the following messages:
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Changed database context to 'master'. Changed database context to 'northwind'.
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If you see that, you ve succeeded. If not, go back and check the permissions in the folder, or try typing the sqlcmd command again.
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Relational Databases and SQL |
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Once you have Northwind installed, you should check to make sure that you can make a data connection to it from your applications. 1. Start Visual Studio and create a new project; it doesn t matter what kind. 2. There s a special window in the IDE that shows your database connections, but it goes by two different names. In C# Express, it s called Database Explorer; in Visual Studio, it s Server Explorer. If the window isn t open already, select View Other Windows Database Explorer (or Server Explorer in Visual Studio) to open it. 3. The Database Explorer will probably contain a single item, Data Connections. To add a connection to the Northwind database, right-click Data Connections and select Add Connection. 4. The Choose Data Source box opens, looking like Figure 20-2. Select Microsoft SQL Server Database File, and click Continue.
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5. The Add Connection dialog box opens next, shown in Figure 20-3. Click the Browse button and navigate to the Northwind.mdf file. If you installed Northwind to the default directory, the file should be in C:\SQL Server 2000 Sample Databases. 6. After you ve selected the .mdf file, it should be listed in the Database file name (new or existing) field. If it isn t, you may need to reinstall Northwind. Click the Test Connection button to make sure everything worked (this may take awhile to respond, so be patient). 7. Click OK. The Northwind.mdf database now appears in the Database Explorer, and you re ready to go.
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20: ADO.NET and Relational Databases
Tables, Records, and Columns
The Northwind database describes a fictional company buying and selling food products. The data for Northwind is divided into 13 tables, or broad sets of data, including Customers, Employees, Orders, Order Details, Products, and so forth. Every table in a relational database is organized into rows, where each row represents a single record say, the data for a single product order. The rows are organized into columns, which represent categories of data. All the rows in a table have the same column structure. For example, the Orders table has these columns: OrderID, CustomerID, EmployeeID, OrderDate, and so on. For any given order, you need to know the customer s name, address, contact name, and so forth. You could store that information with each order, but that would be very inefficient. Instead, you use a second table called Customers, in which each row represents a single customer. In the Customers table is a column for the CustomerID. Each customer has a unique ID, and that field is marked as the primary key for that table. A primary key is the column or combination of columns that uniquely identifies a record in a given table.
Relational Databases and SQL |
The Orders table uses the CustomerID as a foreign key. A foreign key is a column (or combination of columns) that is a primary (or otherwise unique) key from a different table. The Orders table uses the CustomerID (the primary key used in the Customers table) to identify which customer has placed the order. To determine the address for the order, you can use the CustomerID to look up the customer record in the Customers table. This use of foreign keys is particularly helpful in representing one-to-many or manyto-one relationships among tables. By separating information into tables that are linked by foreign keys, you avoid having to repeat information in records. A single customer, for example, can have multiple orders, but it is inefficient to place the same customer information (name, phone number, credit limit, and so on) in every order record. The process of removing redundant information from your records and shifting it to separate tables is called normalization.
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