使用.net core和Oracle.ManagedDataAccess.Core從Oracle查詢中獲取ID

Question

我有以下代碼：

List<foo> collection = getData();
using (OracleConnection conn = _client.GetConnection())
{
    await conn.OpenAsync();
    using (OracleTransaction transaction = conn.BeginTransaction(IsolationLevel.ReadCommitted))
    using (OracleCommand cmd = new OracleCommand())
    {
        cmd.Transaction = transaction;
        cmd.Connection = conn;
        cmd.CommandText = @"INSERT INTO SOME.TABLE
                           (A, B, C)
                           VALUES
                           (:A, :B, :C)";
        cmd.ArrayBindCount = collection.Count;
        cmd.Parameters.Add(":A", OracleDbType.Varchar2, collection.Select(c => c.A).ToArray(), ParameterDirection.Input);
        cmd.Parameters.Add(":B", OracleDbType.Varchar2, collection.Select(c => c.B).ToArray(), ParameterDirection.Input);
        cmd.Parameters.Add(":C", OracleDbType.Varchar2, collection.Select(c => c.C).ToArray(), ParameterDirection.Input);

        try
        {
            await cmd.ExecuteNonQueryAsync();
            transaction.Commit();
        }
        catch (Exception ex)
        {
            transaction.Rollback();
            throw new FailedTransactionException(ex.ToString());
        }
    }
}

在這里，我可以從我的集合中插入多行數據，但是我需要以某種方式返回插入行的ID。 有人可以為我指出正確的方向，還是有更好的方法插入對象數組並找回ID。

Answer 1

您可以通過執行以下操作來獲取生成的ID：

@"INSERT INTO SOME.TABLE
  (A, B, C)
  VALUES
  (:A, :B, :C) 
  RETURNING <YOUR-ID-FIELD> INTO :resultId";

並像這樣聲明結果參數：

var resultParam = new OracleParameter(":resultId", OracleDbType.Decimal /* or whatever type of your identifier has */);
resultParam.Direction = ParameterDirection.ReturnValue;
cmd.Parameters.Add(resultParam);

然后，可以從其參數的Value屬性執行查詢后，從參數中讀取結果：

var result = resultParam.Value