C#上位机读数据库

 string connectionString = string.Format("server=(local);uid=sa;pwd=1234567890;database=msp430");
using (SqlConnection con = new SqlConnection(connectionString))
            {
                con.Open();
                SqlCommand cmd = new SqlCommand("UpdateData", con);
            
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.Add("@shin", SqlDbType.Float).Value = Shine;
                cmd.Parameters.Add("@gas", SqlDbType.Float).Value = GasNondu;
                cmd.Parameters.Add("@temperature", SqlDbType.Float).Value = Temperature;
                cmd.Parameters.Add("@hui", SqlDbType.Float).Value = HuiChen;
                cmd.Parameters.Add("@time", SqlDbType.DateTime).Value = time;


                cmd.Parameters["@shin"].Direction = ParameterDirection.Input;
                cmd.Parameters["@shin"].DbType = DbType.String;
                cmd.Parameters["@gas"].Direction = ParameterDirection.Input;
                cmd.Parameters["@gas"].DbType = DbType.String;
                cmd.Parameters["@temperature"].Direction = ParameterDirection.Input;
                cmd.Parameters["@temperature"].DbType = DbType.String;
                cmd.Parameters["@hui"].Direction = ParameterDirection.Input;
                cmd.Parameters["@hui"].DbType = DbType.String;
                cmd.Parameters["@time"].Direction = ParameterDirection.Input;

                cmd.ExecuteNonQuery();
                con.Close();
            }

带有5个输入参数的存储过程。。还有执行单个command指令时要采用：

sql = "insert into site1AutoData(站点,灰尘度,光照度,气体浓度,空气温度,空气湿度,记录时间) values(01," + num1 + "," + _num2 + "," + _1num3 + "," + _num4 + "," + _num5 + ",'" + time + "')";

用”“括起来，若是字符串的还需要加''