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ADO.NET database programming skills, I believe that many inexperienced people do not know what to do, so this paper summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

ADO.NET database programming is complicated, and every programmer is annoyed by a wide variety of classes, objects, properties and methods. The purpose of this paper is to introduce the main contents of ASP.NET Beta2 database programming and help programmers understand the essence of ADO.NET database programming as quickly as possible.

1. Managed Providers

If you are a beginner, you may ask, what is "Managed Providers"?

Managed Providers provides a simple way to connect and access a database, which is similar to but much stronger than a database connection. Managed Providers provides two programming interfaces, OleDb and SQL Server. Because SQL Server is Microsoft's own product, it provides a special interface for SQL Server, which should be more efficient than using OleDb to access SQL Server.

NameSpaces

All the sample programs in this article need to use the following NameSpaces:

<% @ Import Namespace= "System.Data"% > <% @ Import Namespace= "System.Data.Oledb" > Connection

In order to connect to the database, you must use OleDbConnection:

Dim objConn as New OleDBConnection ("Provider=Microsoft.Jet.OLEDB.4.0; Data Source=e:\ sff\ site\ db\ users.mdb")

Of course, you can also use the specific connection method as a variable. After ADO.NET database programming, you must open the database:

ObjConn.Open ()

In this way, you can use the database. Generally, in *, we are required to close the database connection:

ObjConn.Close () objConn=Nothing Command

After connecting to the database, you can send commands to operate on the database, and OleDbCommand allows you to send commands to operate on the database. According to the SQL statement sent, we can do almost any operation on the database.

Dim objCmd as New OleDbCommand ("SELECT * From users", objConn)

ADO.NET database programming the above statements to establish Command, depending on the habit, you can also use the following methods:

Dim objCmd as New OleDbCommand () objCmd.Connection = objConn objCmd.CommandText = "SELECT * FROM users"

You can also go like this:

Dim objCmd as New OleDbCommand (SQL String, connection string)

Looking closely at the above statement, we find that you can use both the database connection OleDbConnection and the database connection statement when defining the OleDbCommand. The above code does not execute the SQL statement, so now let's see how to do it.

After reading the above, have you mastered the methods of ADO.NET database programming skills? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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