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This article mainly explains "how to connect ADO correctly". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to connect ADO correctly.

A .NET data provider is a collection of classes specifically designed to communicate with specific types of datastores. The .NET Framework includes four such providers: SQL Client .NET data provider, Oracle Client .NET data provider, ODBC .NET data provider, and OLE DB .NET data provider.

The SQL Client and ADO connection object providers are designed to communicate with specific databases, SQL Server and Oracle, respectively. ODBC and OLE DB .NET data providers are often referred to as "bridge" components because they serve as bridges to early technologies, ODBC and OLE DB. These providers enable developers to communicate with various datastores through the ODBC driver and the OLE DB provider, respectively.

Each .NET data provider implements the same base class, ProviderFactory,Connection,ConnectionStringBuilder,Command,DataReader,Parameter and Transaction, except that its actual name depends on the data provider. For example, the SQL Client .NET data provider has a SqlConnection class, while the ADO connection object provider includes an OdbcConnection class. Regardless of which .NET data provider is used, the Connection class of this data provider implements the same basic features through the same base interface.

To open a connection to the datastore, create an instance of the provider connection class, set the object's ConnectionString property, and then call its Open method. Each .NET data provider has its own namespace. The four providers included in the .NET Framework are a subset of the System.Data namespace, where unconnected objects reside in the System.Data namespace.

The SQL Client data provider is in the System.Data.SqlClient namespace, the ODBC .NET data provider is in the System.Data.Odbc namespace, the OLE DB .NET data provider is in the System.Data.OleDb namespace, and the ADO connection object data provider is in the System.Data.OracleClient namespace.

I don't agree with that. I think Microsoft makes Java users second-class citizens. The services provided by .NET have similar functions-we support them. The J2EE specification is more mature / complete, so more support is needed. .net has always been our goal. We need to integrate some of the technologies of .NET to make our products more persuasive.

Obviously Microsoft has privileges and can develop completely and directly using the operating system, while we can't. But we can usually keep pace with Microsoft, so I think we are as good as any other company in terms of resources, white papers, seminars and product launches.

Oracle is primarily a technology infrastructure company for enterprise processing. Users want a secure structure, so we don't want to release anything, and ADO connects objects until everything is ready for production.

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