检查.net核心数据库中是否存在内容，并以布尔值形式返回

using System;
using MySql.Data.MySqlClient;

public class DatabaseChecker
{
    private string connectionString = "server=localhost;user=root;password=123456;database=mydatabase";

    public bool CheckContentExists(string content)
    {
        using (var connection = new MySqlConnection(connectionString))
        {
            connection.Open();

            string query = $"SELECT COUNT(*) FROM mytable WHERE content = '{content}'";
            MySqlCommand command = new MySqlCommand(query, connection);

            int count = Convert.ToInt32(command.ExecuteScalar());

            return count > 0;
        }
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        DatabaseChecker checker = new DatabaseChecker();
        bool exists = checker.CheckContentExists("example content");

        Console.WriteLine($"Content exists: {exists}");
    }
}