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This article focuses on "what are the ADO.NET OracleClient Namespace objects". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn what ADO.NET OracleClient namespace objects are.

We all know that with the development of technology, there are many ways to access the database. I don't know what method you like to use to access the database. First of all, I will introduce several common ones: open Database Interconnection (ODBC), data access object (DAO), remote data object (RDO), ActiveX data object (ADO). Today we are going to focus on a few common objects in the ADO.NET OracleClient namespace as a start to learning about ADO.NET.

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There are both similarities and differences between ADO and ADO.NET. Both of them can write applications that access and manipulate data in the database server, and they are easy to use, high speed, low memory expenditure and less disk space, and support the main functions for building client / server-based and Web-based applications. But ADO uses the OLEDB interface and is based on Microsoft's COM technology, while ADO.NET has its own ADO.NET interface and is based on Microsoft's .NET architecture. It is well known that the .NET architecture is different from the COM system, and the ADO.NET interface is completely different from the ADO and OLEDB interfaces, that is to say, ADO.NET provides an optimized data access model for the .NET architecture, which is completely different from the COM-based ADO.

ADO.NET is a set of object-oriented class libraries that access data sources. To put it simply, the data source is the database, which can also be a text file, Excel table, or XML file. ADO.NET includes a number of objects dedicated to dealing with data. Here are some of the most commonly used objects. These are objects that you must understand to learn ADO.NET. Once we have mastered them, we will see what needs to be considered in using ADO.NET to deal with data.

1. OracleConnection object of ADO.NET OracleClient

To access a data source, you must first establish a connection to it. This connection describes the database server type, database name, user name, password, and other parameters required to connect to the database. The command object knows on which database the ORACLE command is executed by using the connection object.

OracleConnectionoracleConn=newOracleConnection (); oracleConn.ConnectionString= "UserId=scott;Password=tiger; DataSource=oracleSN;"; oracleConn.Open ()

2. OracleCommand object of ADO.NET OracleClient

After connecting to the database, you can start the database operation you want to perform, which is done through the command object, which is typically used to send ORACLE statements to the database. The command object uses the connection object to know which database to connect to. We can either use the command object to execute the ORACLE command directly, or we can pass a reference to a command object to the OracleDataAdapter,OracleDataAdapter that can contain a series of command objects that can handle large amounts of data.

PublicvoidReadMyData (stringconnectionString) {stringqueryString= "SELECTEmpNo,DeptNoFROMScott.Emp"; OracleConnectionconnection=newOracleConnection (connectionString) {OracleCommandcommand=newOracleCommand (queryString,connection); connection.Open (); OracleDataReaderreader=command.ExecuteReader (); try {while (reader.Read ()) {Console.WriteLine (reader.GetInt32 (0) + "," + reader.GetInt32 (1));} finally {reader.Close () } at this point, I believe you have a deeper understanding of "what are the ADO.NET OracleClient namespace objects?" you might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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