ado net tutorial

connection is established, close is not closed directly, but is saved in the connection pool.on the next connection, if the connection string is the same, the connection in the connection pool is called. instead of re-establishing. This will improve some efficiency. This has been verified in the experiment one .1. The Conn object is destroyed, and the connection in the connection pool is not destroyed.2. Connection pooling is provided by ADO, not t

Methods and Techniques for using ADO. NET The following code illustrates how to use the SqlDataAdapter object to generate a DataSet or able command. It retrieves a group of product categories from the SQL Server Northwind database. Using System. Data; Using System. Data. SqlClient; Public DataTable RetrieveRowsWithDataTable () { Using (SqlConnection conn = new SqlConnection (connectionString )) { Conn. Open

Ado. net Connect to SQL ServerThe SQL Server. NET Framework Data Provider supports connection string formats similar to OLE DB (ADO) connection string formats.Using (sqlconnection connection = new sqlconnection (connectionstring )){Connection. open ();// Do work here.} Connect to the ole db data source (ACCESS)Ole db.

Add, delete, modify, and query in ADO. NET ADO. NET:Data Access Technology Is a link connecting C # And MSSQL You can use ADO. NET to write temporary data in the memory to the database.You can also extract data from the database to the memory for the program to call. Basic o

I. Ado. Net Data Access Model 2. Two access policies Policy 1: After the connection is enabled, create a dataset instance and use the data adapter to fill the instance. You can then use the data in the dataset. For example, bind a widget to a dataset member. Policy 2: Open the connection and use SQL statements or stored procedures to directly perform operations on the database. Disconnect. Iii. ap

to exist in a transaction with the deposit and withdrawal operation, that is, the reconciliation operation will run independently regardless of whether the deposit and withdrawal operation is successful or not. Suppress: Ignores any transactions within the scope of a transaction that are used to create a non-transactional environment in which the compete () operation is not valid.11. Using Distributed Transactionswhen using a transactional scope, ADO

(1). Description When I was a beginner, ADO. Net made me dizzy when accessing the database by ADO. net.In this article, they are integrated, and the article does not involve too much deep knowledge, but I think they are integrated together,In comparison, learning is faster and clearer:This article lists all the methods for accessing the database using

..."); else Console.WriteLine ("Data not read ..."); while (Datareader.read ()) {Console.WriteLine (datareader.getstring (1) + ":" + datareader.getdouble (2)* Datareader.getdouble (3)); }}}} Cat CH (Exception ex) {Console.WriteLine (ex). Message); } console.readkey (); } }}You can try to change the select * from product to a statement such as select Id,name from productAttached: If you want to use ADO