C# 如何在sql informix子句中使用参数

如何在sql informix子句中使用参数

StringBuilder cmdTxt = new StringBuilder();
cmdTxt.Append(" SELECT COUNT(emp_num) ");
cmdTxt.Append(" FROM tbl1 WHERE year IS NULL AND calc_year = ? AND camp IN (,,,)");


                using (var myIfxCmd = new IfxCommand(cmdTxt.ToString(), con))
                {
                    myIfxCmd.CommandType = CommandType.Text;
                    myIfxCmd.Parameters.Add("calc_year", IfxType.Integer);

                    if (con.State == ConnectionState.Closed)
                    {
                        con.Open();
                    }
                    myIfxCmd.Parameters[0].Value = calcYear;

                    res = int.Parse(myIfxCmd.ExecuteScalar().ToString());
                }

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我不知道如何处理将参数传递到（，，，）中的

camp//数字集

IDbCommand cmd = connection.CreateCommand(); //connection has been instantiated
cmd.CommandTimeout = connection.ConnectionTimeout;

var query = @"SELECT COUNT(emp_num)
              FROM tbl1 WHERE year IS NULL AND calc_year = @year AND camp IN ({0})";


cmd.Parameters.Add(new SqlParameter("@year", calcYear));
var sb = new StringBuilder();
//ids is a list/array of ids i want in the in clause
for (int i = 0; i < ids.Count; i++)
{
   sb.AppendFormat("@p{0},", i);
   cmd.Parameters.Add(new SqlParameter("@p" + i, ids[i]));
}
if (sb.Length > 0) { sb.Length -= 1; }
string cmdText = string.Format(query, sb.ToString());

cmd.CommandText = cmdText;

cmd.Connection = connection;
var reader = cmd.ExecuteReader();

IDbCommand cmd=connection.CreateCommand（）//连接已实例化
cmd.CommandTimeout=connection.ConnectionTimeout；
var query=@“选择计数（emp_num）
从tbl1开始，其中year为NULL，calc_year=@year，camp IN（{0}）”；
cmd.Parameters.Add（新的SqlParameter（“@year”，calcYear））；
var sb=新的StringBuilder（）；
//ids是我希望在in子句中使用的ID的列表/数组
for（int i=0；i0）{sb.Length-=1；}
string cmdText=string.Format（query，sb.ToString（））；
cmd.CommandText=cmdText；
cmd.Connection=连接；
var reader=cmd.ExecuteReader（）；