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OracleParameter[] parameters = new OracleParameter[2];
  parameters[0] = new OracleParameter("p_customersn", OracleDbType.Varchar2);
  parameters[0].Value = customerSn;
  parameters[1] = new OracleParameter("p_photo", OracleDbType.Blob, photo.Length);
  parameters[1].Value = photo;
  OracleHelper.ExecuteNonQuery(Program.connectionString, CommandType.StoredProcedure, "update_photp", parameters);


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PROCEDURE update_photp (p_customersn IN VARCHAR2, p_photo IN BLOB)
  IS
  BEGIN
--È¡³öblob¶ÔÏó
  UPDATE spe_customer
  SET photo = p_photo
  WHERE customer_sn = p_customersn;
  END;
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PROCEDURE update_photp (p_customersn IN VARCHAR2, p_photo IN BLOB)
  IS
  lobloc BLOB;
  query_str VARCHAR2 (1000);
  BEGIN
--È¡³öblob¶ÔÏó
  UPDATE spe_customer
  SET photo = EMPTY_BLOB ()
  WHERE customer_sn = p_c


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