菜鸟问题，来帮帮忙！谢谢

Question

select type,count(*) as f from[Book] group by Type
显示的话方法很多啊。用dataset就可以了

Answer 1

用个dataset来接受这条语句的返回值，读dataset就可以读出来count了。SqlConnection conn = new SqlConnection(“server=(local);uid=sa;pwd=;database=your database”);
conn.Open();
SqlDataAdapter sd = new SqlDataAdater(“select count(*) f from [Book] group by Type”,conn)
DataSet ds = new DataSet();
sd.fill(ds);
conn.close();int count = (int)ds.Tables[0].rows[0][0].ToString();

Answer 2

        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);            // we use a try/catch here because if the method throws an exception we want to 
            // close the connection throw code, because no datareader will exist, hence the 
            // commandBehaviour.CloseConnection will not work
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch
            {
                conn.Close();
                throw;
            }
        }