Question

我想在C＃程序中将HEX字符串作为参数传递给 oracle存储过程。存储过程以df['date from'] = pd.to_datetime(df['date from']) df['date to'] = pd.to_datetime(df['date to']) d = {'date from':['min', 'idxmin'], 'date to':['max', 'idxmax']} df1 = df.set_index('Subjectname').groupby(['id','name']).agg(d) df1.columns = df1.columns.map('_'.join) d1 = {'date from_min':'from','date to_max':'to', 'date from_idxmin':'subject from','date to_idxmax':'subject to'} cols = ['from','to','subject from','subject to'] df1 = df1.rename(columns=d1).reindex(columns=cols).reset_index() print (df1) id name from to subject from subject to 0 1188 Cera 2016-01-08 2016-09-30 math math 1 1199 ron 2017-01-06 NaT english NaN 2 1288 Snow 2017-01-01 NaT tally NaN 3 1433 sansa 2016-01-25 2017-01-16 tally tally 4 1522 stark 2016-01-01 NaT phy NaN 5 1722 sid 2017-01-06 2018-03-31 history history 6 1844 amy 2016-01-01 2017-10-11 science adv 7 2100 arya 2016-01-08 2017-05-31 english math作为输入参数。因此，我需要将HEX转换为RAW，然后将RAW转换为varchar2。以下代码显示了这个想法。

varchar2

目前，此代码无法工作。谁能给我有关如何正确执行操作的建议。

Answer 1

对于 Oracle ，请尝试使用匿名块（begin..end;语法，而不是call）：

//DONE: do not forget to dispose IDsiposable
using (OracleCommand cmd = new OracleCommand()) {
  cmd.Connection = conn;
  cmd.CommandType = CommandType.Text; // redundant, can be dropped

  cmd.CommandText = 
    @"begin 
        checking(utl_raw.cast_to_varchar2(hextoraw(:in_data)), :return_cde);
      end";

  // 5000 - be careful - in SQL Oracle can operate with VarChar2 up to 4000;
  // in PL/SQL, however, the limit is 32000 
  cmd.Parameters.Add("in_data", 
                      OracleDbType.Varchar2, 
                      5000, 
                     "000102030405060708090A0B0C0D",
                      ParameterDirection.Input);

  cmd.Parameters.Add("return_cde", 
                      OracleDbType.Varchar2, 
                      8, 
                     "OK", 
                      ParameterDirection.InputOutput);

  cmd.ExecuteNonQuery();

  return_cde = cmd.Parameters["return_cde"].Value.ToString();
}

如何在C＃中使用函数将参数传递给oracle存储过程

1 个答案: