ado net tutorial

with a standard iterative approach.The Entity Framework and LINQ are the two new tools Microsoft has built to improve the core functionality of ADO. It is important to note that they are not an essential part of ADO .The Entity Framework takes advantage of the abstraction of data structures to convert each database object into an Application object (entity), and the data fields are converted to properties,

with a standard iterative approach.The Entity Framework and LINQ are the two new tools Microsoft has built to improve the core functionality of ADO. It is important to note that they are not an essential part of ADO .The Entity Framework takes advantage of the abstraction of data structures to convert each database object into an Application object (entity), and the data fields are converted to properties,

connecting to the data source. connecting =2,////Summary://The Connection object is executing the command. (This value is reserved for future versions of this product.) )executing =4,////Summary://The Connection object is retrieving data. (This value is reserved for future versions of this product.) )fetching =8,////Summary://the connection to the data source was interrupted. This behavior can occur only after the connection is open. You can turn off the connection in this state and then turn i

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Provider that is responsible for communicating with external systems. The specific architecture is as follows:Another core element of the ADO structure is the. NET Data Provider (Provider). Details include: The Connection object provides a connection to the data source. The Command object enables you to access database commands that return data, modify data, run stored procedures, and send or

the ID of the insert row is, so that we can do other things with the ID of the inserted row, such as the display on the page and so on. Of course there are many ways to implement, such as using the C # out modifier to decorate the parameters, I prefer to use the SQL Server database native OUTPUT keyword. The OUTPUT keyword returns a field of the insert operation (typically the primary key ID). So we can easily get the primary key of the inserted row by combining the OUTPUT keyword with the Exec

= "MyDataBase"; 5 builder. IntegratedSecurity = true;5. Storing the connection string in the configuration fileIn our actual development, we generally do not write the connection string directly in the code, but rather stored in the configuration file. Writes the connection string to die in the code, is inconvenient to maintain, each time modifies the string, also must recompile the code. As an example of an ASP. NET application, we typically write t

SummaryAdo. NET is a powerful advantage in providing consistent access to different data sources. In the previous article, "What you have to know about ADO (ii) about the. NET data provider," we know. NET uses different data providers for different data sources, which allows us to access the appropriate data sources mo

connection state of SQL Server (1) through the Activity MonitorFirst step: Open the Mssms Manager and click the Activity Monitor icon.Step Two: in the Open Activity Monitor view, click the Processes tab.Step three: run #4 Connection pool exception and The example in the processing method, you can see the open 5 connections, as shown in.(2) using T-SQL statementsSimilarly, we can monitor the connection status by executing the system stored procedure sp_who.EXEC sp_whoThe following results can be

care why there is such a mechanism, there is always the truth of it. Since a new connection is so painful, why not reuse existing connections?In fact, ADO. NET has provided us with an optimization method called connection pooling. A connection pool is one such container: it holds a certain number of physical connections to the database server. Therefore, when we need to connect to the database server, we s

connection objects, for different data sources, ADO. NET provides different command objects. Specifically, it can be divided into the following command object. . NET Data provider corresponding Command object . NET Framework Data Provider for OLE DB OleDbCommand Object

need to add exception handling. For C #, typical exception handling is to add Try...catch blocks of code. The finially is optional. Finially is a block of code that executes regardless of whether the code has an exception. and The database connection resources, is very valuable . Therefore, we should make sure that after the connection is opened, the connection and the resource release should be closed, regardless of whether an exception occurs. Therefore, we must call the Close method in the F

(SqlCommand sqlcmd=NewSqlCommand (Cmd,conn)) {Sqlcmd.commandtext=cmd; if(sqlcmd. ExecuteNonQuery () >0) {Console.WriteLine ("Modification succeeded"); } Else{Console.WriteLine ("Modification Failed"); } } } }View CodeDeclaring SQL statement calls on the console entry method of adding and deleting changes Static voidMain (string[] args) { //SQL connection String varADONet =NewADONet (".","Ttest","SA","123456"); ////Invoke Query method

Ado. NET database programming is more complex, the numerous classes, objects, attributes, methods make every programmer feel annoyed. The purpose of this paper is to introduce the main contents of ASP.net Beta2 database programming, and to help programmers understand the essence of ado.net database programming in the quickest. First, Managed Providers If you are a beginner, you may ask, what is "Managed P

By repeatedly executing the INSERT command into the database, compare the performance of accessing SQL Server by ADO. Net ole db provider, ADO. Net SQL provider and ADO. Net ODBC provider. { Function onclick () { Function onclick

Abstract:This article discusses how to use ADO. Net to perform basic database operations and when to use ADO. net instead of ADO. Directory . NET data accessRead dataDataset, datatable, and recordsetConvert existing codeUpdate Da

ArticleDirectory Summary Directory Summary As one of the most important components of the. NET Framework, ADO. Net plays an applicationProgramAn important role that interacts with data. This article will discuss ADO. Net from a macro perspective and share wi

In recent years, as the preferred method for data access in Windows-based applications, ADO plays an important role. A large number of ADO applications are currently in use, and a large number of developers are familiar with ADO development. With the emergence of. NET Framework, AD