今天第一次使用参数化形式,但是值一直无法传过去,请大家指点指点
com6.CommandText = "Select wlmc,gz,pz,gg,bz,zjm from wl where wlid like '@Wlid'; Select kfmc from kf where kfid = @Kfid_to"; com6.Parameters.Add(new SqlParameter("@Wlid", Wlid));
com6.Parameters.Add(new SqlParameter("@Kfid_to", Kfid_to));
为什么Wlid和Kfid_to的值有,但是@Wlid和@Kfid_to的值没有?
com6.CommandText = "Select wlmc,gz,pz,gg,bz,zjm from wl where wlid like '@Wlid'; Select kfmc from kf where kfid = @Kfid_to"; com6.Parameters.Add(new SqlParameter("@Wlid", Wlid));
com6.Parameters.Add(new SqlParameter("@Kfid_to", Kfid_to));
为什么Wlid和Kfid_to的值有,但是@Wlid和@Kfid_to的值没有?
com6.Parameters.Add(new SqlParameter(@"Kfid_to", Kfid_to));
试看
com6.Parameters.Add(new SqlParameter("@Wlid", Wlid));
com6.Parameters.Add(new SqlParameter("@Kfid_to", Kfid_to));com6.CommandText = "Select wlmc,gz,pz,gg,bz,zjm from wl where wlid like '@Wlid'; Select kfmc from kf where kfid = @Kfid_to";
顺序有没有反了?
第一个:Select wlmc,gz,pz,gg,bz,zjm from wl where wlid like '@Wlid',这里不需要 '';建议这样写好点:
sb.append("Select wlmc,gz,pz,gg,bz,zjm from wl ");
sb.append(" where wlid like '%' + ");
sb.append(" @Wlid ");
sb.append(" + '%' ");
byte[] FullPic = (byte[])de.Key;
byte[] SmallPic = (byte[])de.Value;
string FullPicSql = string.Format("insert into ProductFullPic (ProductID,Content) values({0},@pic)", productID);
string SmallPicSql = string.Format("insert into ProductSmallPic (ProductID,Content) values({0},@pic)", productID);
//插入原图
cmd.CommandText = FullPicSql;
cmd.Parameters.Add("@pic", MySqlDbType.Blob);
cmd.Parameters["@pic"].Value = FullPic;
count += cmd.ExecuteNonQuery();
//插入缩略图
cmd.CommandText = SmallPicSql;
//cmd.Parameters.Add("@pic", MySqlDbType.Blob);
cmd.Parameters["@pic"].Value = SmallPic;
count += cmd.ExecuteNonQuery();