SqlHelper类的使用

public static class SqlHelper
    {
        private static readonly string conStr = ConfigurationManager.ConnectionStrings["sql"].ConnectionString;

        public static int ExecuteNonQuery(string sql, CommandType cmdType, params SqlParameter[] pms)
        {
            using (SqlConnection con = new SqlConnection(conStr))
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    cmd.CommandType = cmdType;
                    if (pms != null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    con.Open();
                    return cmd.ExecuteNonQuery();
                }
            }
        }

        public static object ExecuteScalar(string sql, CommandType cmdType, params SqlParameter[] pms)
        {
            using (SqlConnection con = new SqlConnection(conStr))
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    cmd.CommandType = cmdType;
                    if (pms != null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    con.Open();
                    return cmd.ExecuteScalar();
                }
            }
        }


        public static SqlDataReader ExecuteReader(string sql, CommandType cmdType, params SqlParameter[] pms)
        {
            SqlConnection con = new SqlConnection(conStr);
            try
            {
                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    cmd.CommandType = cmdType;
                    if (pms != null)
                    {
                        cmd.Parameters.AddRange(pms);
                    }
                    con.Open();
                    SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                    return reader;
                }
            }
            catch
            {
                con.Dispose();
                throw;
            }
        }


        public static DataTable ExecuteDataTable(string sql, CommandType cmdType, params SqlParameter[] pms)
        {
            using (SqlDataAdapter sda = new SqlDataAdapter(sql, conStr))
            {
                DataTable dt = new DataTable();

                sda.SelectCommand.CommandType = cmdType;
                if (pms != null)
                {
                    sda.SelectCommand.Parameters.AddRange(pms);
                }
                sda.Fill(dt);
                return dt;
            }
        }
    }

  #region 多条件搜索使用带参数的sql语句

            StringBuilder sql = new StringBuilder("select * from PhoneNum");
            List<string> wheres = new List<string>();
            List<SqlParameter> listParameter = new List<SqlParameter>();

            if (cboGroup.SelectedIndex != 0)
            {
                //sql.Append(" and ptypeid=" + cboGroup.Text.Split(‘|‘)[0]);
                //wheres.Add(" ptypeid=" + cboGroup.Text.Split(‘|‘)[0]);
                wheres.Add(" ptypeid=@typeid ");
                listParameter.Add(new SqlParameter("@typeid", cboGroup.Text.Split(‘|‘)[0]));
            }

            if (txtSearchName.Text.Trim().Length > 0)
            {
                // sql.Append(" and pname like ‘%" + txtSearchName.Text.Trim() + "%‘");
                wheres.Add(" pname like @pname ");
                //pname like ‘%乔%‘
                //pname liek ‘%‘+@pname+‘%‘
                listParameter.Add(new SqlParameter("@pname", "%" + txtSearchName.Text.Trim() + "%"));
            }

            if (txtSearchCellPhone.Text.Trim().Length > 0)
            {
                //sql.Append(" and  pcellphone like ‘%" + txtSearchCellPhone.Text.Trim() + "%‘");
                //wheres.Add(" pcellphone like ‘%" + txtSearchCellPhone.Text.Trim() + "%‘");
                wheres.Add(" pcellphone like @cellphone ");
                listParameter.Add(new SqlParameter("@cellphone", "%" + txtSearchCellPhone.Text.Trim() + "%"));
            }


            //判断用户是否选择了条件
            if (wheres.Count > 0)
            {
                string wh = string.Join(" and ", wheres.ToArray());
                sql.Append(" where " + wh);
            }



            SqlHelper.ExecuteDataTable(sql.ToString(), listParameter.ToArray());
            #endregion