MySql获取行数

Question

我尝试从表中获取行数:

        string commandLine = "SELECT COUNT(*) FROM client";

        using (MySqlConnection connect = new MySqlConnection(connectionStringMySql))
        using (MySqlCommand cmd = new MySqlCommand(commandLine, connect))
        {
            connect.Open();

            int count = (int)cmd.ExecuteScalar();

            return count;
        }

我得到了例外:

Specified cast is not valid.

知道我怎么解决它？

Answer 1

试试这个

using (MySqlCommand cmd = new MySqlCommand(commandLine, connect))
{
    connect.Open();
    return Convert.ToInt32(cmd.ExecuteScalar());
}