qr code generator c# code project sqlmetal "C:\Code\pubs.mdf" /language:vb /dbml:Pubs.dbml in Visual C#.NET

Maker QR Code ISO/IEC18004 in Visual C#.NET sqlmetal "C:\Code\pubs.mdf" /language:vb /dbml:Pubs.dbml

sqlmetal "C:\Code\pubs.mdf" /language:vb /dbml:Pubs.dbml
Making QR Code In Visual C#
Using Barcode maker for .NET Control to generate, create Denso QR Bar Code image in .NET applications.
www.OnBarcode.com
Decode QR Code ISO/IEC18004 In C#.NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
To create the code, you simply indicate the /code option as follows.
Paint Bar Code In Visual C#.NET
Using Barcode maker for Visual Studio .NET Control to generate, create bar code image in .NET framework applications.
www.OnBarcode.com
Scan Bar Code In C#
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
sqlmetal "C:\Code\pubs.mdf" /language:vb /code:Pubs.vb
QR Code JIS X 0510 Creator In .NET Framework
Using Barcode creator for ASP.NET Control to generate, create QR image in ASP.NET applications.
www.OnBarcode.com
Encoding QR Code In .NET Framework
Using Barcode creation for Visual Studio .NET Control to generate, create QR-Code image in Visual Studio .NET applications.
www.OnBarcode.com
You can then add these files to the App_Code directory of your project. You work with them in the same way as with any other DBML file.
Make QR Code JIS X 0510 In Visual Basic .NET
Using Barcode creator for VS .NET Control to generate, create QR Code image in .NET framework applications.
www.OnBarcode.com
Generating QR Code 2d Barcode In C#.NET
Using Barcode drawer for .NET Control to generate, create Denso QR Bar Code image in .NET framework applications.
www.OnBarcode.com
Lesson 2: LINQ and ADO.NET
Code 128 Generation In C#
Using Barcode generation for VS .NET Control to generate, create Code-128 image in .NET applications.
www.OnBarcode.com
Matrix 2D Barcode Generator In Visual C#.NET
Using Barcode encoder for .NET framework Control to generate, create Matrix 2D Barcode image in .NET applications.
www.OnBarcode.com
ChAPTER 11
GS1 - 12 Drawer In Visual C#
Using Barcode creator for .NET Control to generate, create UPC A image in Visual Studio .NET applications.
www.OnBarcode.com
Leitcode Printer In Visual C#
Using Barcode generator for Visual Studio .NET Control to generate, create Leitcode image in Visual Studio .NET applications.
www.OnBarcode.com
MAPPING OBJECTS TO ENTITIES IN THE CODE EDITOR
Paint Code 39 Full ASCII In .NET
Using Barcode drawer for .NET framework Control to generate, create Code 39 image in .NET framework applications.
www.OnBarcode.com
Code 128B Printer In Java
Using Barcode creation for Java Control to generate, create Code 128 image in Java applications.
www.OnBarcode.com
The third option for connecting classes to database objects is to write the code yourself. This can provide granular control, but it can also be a lot of work. It is recommended that you use an automated tool, but this section demonstrates how you can define your own O/R map. To get started, you first create a class file. At the top of the class file, you should define an Imports statement (a using statement in C#) to include the following namespaces.
QR-Code Encoder In Java
Using Barcode maker for Java Control to generate, create QR Code ISO/IEC18004 image in Java applications.
www.OnBarcode.com
Recognize Barcode In Java
Using Barcode Control SDK for BIRT Control to generate, create, read, scan barcode image in BIRT reports applications.
www.OnBarcode.com
Sample of Visual Basic Code Imports System.Data.Linq Imports System.Data.Linq.Mapping Sample of C# Code using System.Data.Linq; using System.Data.Linq.Mapping;
GTIN - 128 Creation In VB.NET
Using Barcode maker for Visual Studio .NET Control to generate, create GS1 128 image in .NET applications.
www.OnBarcode.com
Making Code 39 Full ASCII In None
Using Barcode generator for Font Control to generate, create Code 39 image in Font applications.
www.OnBarcode.com
The next step is to link your class to a table in the database through the Table attribute. The following code shows an example.
European Article Number 13 Encoder In None
Using Barcode creation for Font Control to generate, create European Article Number 13 image in Font applications.
www.OnBarcode.com
Drawing Code 128 Code Set A In VB.NET
Using Barcode creation for Visual Studio .NET Control to generate, create Code 128 Code Set A image in .NET framework applications.
www.OnBarcode.com
Sample of Visual Basic Code <Table(Name:="Authors")> _ Public Class Author Sample of C# Code [Table(Name="Authors")] public class Author {
The next step is to create properties on the object, with the Column attribute applied to each, that map the database table columns to the specified property. This class lets you set the name of the database field (if it is different from the name of the property), the variable you intend to use to store the field s value, the data type, whether the item is a primary key, and more. The following code shows an example of two properties mapped to columns in the authors table of the pubs database.
Sample of Visual Basic Code Private _authorId As String <Column(IsPrimaryKey:=True, Storage:="_authorId", name:="au_id")> _ Public Property Id() As String Get Return _authorId End Get Set(ByVal value As String) _authorId = value End Set End Property Private _lastName As String <Column(Storage:="_lastName", name:="au_lname")> _ Public Property LastName() As String Get Return _lastName
668 ChAPTER 11
Connecting to and Querying Data with LINQ
End Get Set(ByVal value As String) _lastName = value End Set End Property Sample of C# Code private string _authorId; [Column(IsPrimaryKey=true, Storage="_authorId", Name="au_id")] public string Id { get { return _authorId; } set { _authorId = value; } } private string _lastName; [Column(Storage = "_lastName", Name = "au_lname")] public string LastName { get { return _lastName; } set { _lastName = value; } }
The final step is to create a class that exposes your tables. You do so by inheriting from the DataContext object. This object acts as the go-between for your database and your objects. You then expose your database and its tables as properties of this class. You can define the class to automatically get a connection to the database when it is created. Alternatively, you can pass a database connection string to it. The following example shows how to provide the connection string to the constructor of the class.
Sample of Visual Basic Code Public Class PubsDb Inherits DataContext Public Authors As Table(Of Author) Public Titles As Table(Of Title) Public Sub New(ByVal connection As String) MyBase.New(connection) End Sub End Class
Lesson 2: LINQ and ADO.NET
ChAPTER 11
Sample of C# Code public class PubsDb: DataContext { public Table<Author> Authors; public Table<Title> Titles; public PubsDb(string connection) : base(connection) { } }
When your code is complete, you can use your custom O/R map class as you would one that was generated from a code generator. If you add other (nonmapped) properties, fields, and methods, they are ignored at run time. In this way, you control the logic you intend to put in your classes when you write your O/R map.
Querying Data with LINQ to SQL
You query data with LINQ to SQL much like you write any LINQ query. The big difference is the simplified way in which you connect to the actual data and the fact that you can write your queries by using the O/R mapped objects. If you are using an auto-generated DBML file, the file will inherit from DataContext and will already be set up to get a connection to the database. You simply need to create an instance of this file and write your query. As an example, the following code shows how to define a query against the authors table and then bind the results to a GridView.
Sample of Visual Basic Code Dim pubs As PubsDatabaseModelDataContext = _ New PubsDatabaseModelDataContext() Dim authQuery = From auth In pubs.authors Where auth.state = "CA" Order By auth.au_lname Select auth GridView1.DataSource = authQuery GridView1.DataBind() Sample of C# Code PubsDatabaseModelDataContext pubs = new PubsDatabaseModelDataContext();
var authQuery = from auth in pubs.authors where auth.state == "CA" orderby auth.au_lname select auth; GridView1.DataSource = authQuery; GridView1.DataBind();
Copyright © OnBarcode.com . All rights reserved.