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To connect to a SQLServer database, the most common way to C# is to use the SqlConnection class in ADO.NET. 1. You need to install the Microsoft.Data.SqlClient package and reference the namespace; 2. Write a connection string containing the server address, database name, and authentication information; 3. Use using and try-catch to establish a connection and execute queries, while ensuring resource release and exception handling; 4. Common problems include remote connection settings, firewall configuration, port release and login permissions, etc., and need to be checked one by one.

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The steps to connect to a cloud server through an Oracle client are as follows: Create an SSH key and copy the public key to the cloud server. Configure the Oracle client and add the connection information of the cloud server to the tnsnames.ora file. Create a new database connection in the Oracle client, enter the username, password, and DSN. Click OK and verify that the connection is successful.


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Object-oriented php operation mssql class
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Complete PHP operation MySQL database class
Complete PHP operation MySQL database class
