open source qr code library vb.net creating database instances in VB.NET

Printing USS Code 39 in VB.NET creating database instances

creating database instances
Code 39 Full ASCII Generator In VB.NET
Using Barcode printer for Visual Studio .NET Control to generate, create Code-39 image in VS .NET applications.
www.OnBarcode.com
Read USS Code 39 In Visual Basic .NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
The code above shows how you can get an instance of the default database and a named instance (using the name in the connection strings section). Using the default database is a useful approach because you can change which of the databases defined in your configuration is the default simply by editing the configuration file, without requiring recompilation or redeployment of the application. Notice that the code above references the database instances as instances of the Database base class. This is required for compatibility if you want to be able to change the database type at some later stage. However, it means that you can only use the
Encoding Bar Code In Visual Basic .NET
Using Barcode printer for VS .NET Control to generate, create barcode image in .NET framework applications.
www.OnBarcode.com
Decode Bar Code In Visual Basic .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
ch a pter t wo
Draw Code 3 Of 9 In Visual C#.NET
Using Barcode printer for .NET Control to generate, create USS Code 39 image in VS .NET applications.
www.OnBarcode.com
Generate Code 39 Extended In .NET Framework
Using Barcode generator for ASP.NET Control to generate, create Code 3 of 9 image in ASP.NET applications.
www.OnBarcode.com
features available across all of the possible database types (the methods and properties defined in the Database class). Some features are only available in the concrete types for a specific database. For example, the ExecuteXmlReader method is only available in the SqlDatabase class. If you want to use such features, you must cast the database type you instantiate to the appropriate concrete type. The following code creates an instance of the SqlDatabase class.
Make Code 3 Of 9 In VS .NET
Using Barcode creator for .NET framework Control to generate, create Code 39 Full ASCII image in VS .NET applications.
www.OnBarcode.com
EAN13 Generator In VB.NET
Using Barcode generator for VS .NET Control to generate, create EAN / UCC - 13 image in .NET applications.
www.OnBarcode.com
// Resolve a SqlDatabase object from the container using the default database. SqlDatabase sqlServerDB = EnterpriseLibraryContainer.Current.GetInstance<Database>() as SqlDatabase;
GS1 - 12 Creator In VB.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create UPC A image in Visual Studio .NET applications.
www.OnBarcode.com
USS Code 39 Printer In Visual Basic .NET
Using Barcode maker for VS .NET Control to generate, create Code 3 of 9 image in Visual Studio .NET applications.
www.OnBarcode.com
In addition to using configuration to define the databases you will use, the Data Access block allows you to create instances of concrete types that inherit from the Database class directly in your code, as shown here. All you need to do is provide a connection string that specifies the appropriate ADO.NET data provider type (such as SqlClient).
Making PDF-417 2d Barcode In Visual Basic .NET
Using Barcode generator for VS .NET Control to generate, create PDF 417 image in .NET applications.
www.OnBarcode.com
Create USPS Intelligent Mail In Visual Basic .NET
Using Barcode generator for VS .NET Control to generate, create 4-State Customer Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
// Assume the method GetConnectionString exists in your application and // returns a valid connection string. string myConnectionString = GetConnectionString(); SqlDatabase sqlDatabase = new SqlDatabase(myConnectionString);
Decode Denso QR Bar Code In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Barcode Generation In Objective-C
Using Barcode generation for iPhone Control to generate, create barcode image in iPhone applications.
www.OnBarcode.com
Now that you have your new Database object ready to go, we ll show you how you can use it to perform a variety of tasks. You can download an example application (a simple console-based application) that demonstrates all of the scenarios you will see in the remainder of this chapter. You can run this directly from the bin\debug folder, or open the solution named DataAccess in Microsoft Visual Studio to see all of the code as you run the examples. The two connection strings for the database we provide with this example are:
Print PDF 417 In None
Using Barcode drawer for Font Control to generate, create PDF417 image in Font applications.
www.OnBarcode.com
Make Code 128 Code Set C In None
Using Barcode maker for Online Control to generate, create Code 128A image in Online applications.
www.OnBarcode.com
Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\WWPlatform mdf;Integrated Security=True;User Instance=TrueAsynchronous Processing=true; Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\WWPlatform mdf;Integrated Security=True;User Instance=True
Drawing Bar Code In None
Using Barcode drawer for Software Control to generate, create bar code image in Software applications.
www.OnBarcode.com
Encode Bar Code In .NET
Using Barcode creator for ASP.NET Control to generate, create bar code image in ASP.NET applications.
www.OnBarcode.com
the example application
Code 39 Creator In None
Using Barcode generator for Microsoft Word Control to generate, create Code 39 Full ASCII image in Word applications.
www.OnBarcode.com
Making EAN 13 In Java
Using Barcode generator for Java Control to generate, create GS1 - 13 image in Java applications.
www.OnBarcode.com
If you have configured a different database using the scripts provided with the example, you may find that you get an error when you run this example. It is likely that you have an invalid connection string in your App.config file for your database. In addition, use the Services MMC snap-in in your Administrative Tools folder to check that the SQL Server (SQLEXPRESS) database service (the service is named MSSQL$SQLEXPRESS) is running.
much a do a bout data access
In addition, the final example for this block uses the Distributed Transaction Coordinator (DTC) service. This service may not be set to auto-start on your machine. If you receive an error that the DTC service is not available, open the Services MMC snap-in from your Administrative Tools menu and start the service manually; then run the example again.
One of the most common operations when working with a database is reading multiple rows of data. In a .NET application, you usually access these rows as a DataReader instance, or store them in a DataTable (usually within a DataSet you create). In this section we ll look at the use of the ExecuteReader method that returns a DataReader. You will see how to use a DataSet with the Data Access block methods later in this chapter. Reading Rows Using a Query with No Parameters Simple queries consisting of an inline SQL statement or a stored procedure, which take no parameters, can be executed using the ExecuteReader method overload that accepts a CommandType value and a SQL statement or stored procedure name as a string. The following code shows the simplest approach for a stored procedure, where you can also omit the CommandType parameter. The default is CommandType.Stored Procedure (unlike ADO.NET, where the default is CommandType.Text).
// Call the ExecuteReader method by specifying just the stored procedure name. using (IDataReader reader = namedDB.ExecuteReader("MyStoredProcName")) { // Use the values in the rows as required. }
Copyright © OnBarcode.com . All rights reserved.