using System.Data.SqlClient; public class SqlDatabase : IDatabase { private SqlConnection sqlConn; public SqlDatabase(string connectionString) { sqlConn = new SqlConnection(connectionString); } // Implement methods in IDatabase interface public void OpenConnection() { sqlConn.Open(); } public void CloseConnection() { sqlConn.Close(); } // Remaining methods }
using MySql.Data.MySqlClient; public class MySqlDatabase : IDatabase { private MySqlConnection mySqlConn; public MySqlDatabase(string connectionString) { mySqlConn = new MySqlConnection(connectionString); } // Implement methods in IDatabase interface public void OpenConnection() { mySqlConn.Open(); } public void CloseConnection() { mySqlConn.Close(); } // Remaining methods }This code example shows how to create a custom class that implements the IDatabase interface for querying a MySQL database. The MySqlConnection class is used to establish a connection to the database using a connection string provided by the user. Package library: The System.Data.Common assembly contains the IDatabase interface and is part of the .NET framework. Other packages, such as the MySql.Data and System.Data.SqlClient packages, provide specific implementations for different database types.