QODBC SQL 的问题

Question

好的。在过去的几天里，我一直在努力做世界上最简单的报告……

因此，在弄清楚表关联并提取样本数据之后，我注意到我需要改变我提取数据的方式。 其中一部分是从 Invoice 表中提取 Year-to-Date。 但是，qodbc很笨（可能是我，但怪司机让我好过）

SELECT * FROM Invoice WHERE TimeCreated > '2014-01-01 00:00:00.000' 不断给我Invalid operand for operator: > 的错误

搜索 Google 对我没有任何帮助。
Soooo...我需要按日期字段搜索的帮助。有人有任何想法或建议吗？

此外，奖励积分但相关...还有其他人对 qodbc 驱动程序的速度有疑问吗？有些表的搜索速度与 mysql 一样快，但有些表......神圣的废话。一个简单的查询需要 10 分钟。提高这些速度的想法？

Answer 1

日期格式

SELECT *
from InvoiceLine
WHERE Txndate >= {d '2005-09-23'}

时间戳格式

SELECT *
FROM Customer
WHERE TimeCreated = {ts '1999-07-29 14:24:18.000'}

SELECT *
from InvoiceLine
WHERE TimeModified >= {ts '2005-09-23 00:00:00.000'}

参考：http://support.flexquarters.com/esupport/index.php?/Default/Knowledgebase/Article/View/2203/50/how-are-dates-formatted-in-sql-queries-when-using-the-quickbooks-generated-time-stamps

如何让 QODBC 运行得更快

  Keep in mind that QODBC is not a database tool, but rather a translation tool. QuickBooks is a non-normalized flat file system which has no indexes available and will not perform like SQL Server or dBase files. Every transaction you request must be translated and communicated to QuickBooks via large complicated XML transactions.

  Try and keep your result set as small as possible to get a feel for the system, carefully design and test any multi-file joins, and keep the number of returned fields to a minimum for maximum performance.

  Our main goal is to make it easier to access QuickBooks data in a standardised database-like fashion, but queries must be optimized to perform as fast as possible.

  Also, try and use ranges of dates on TxnDate, TxnDateMacro and TimeModified as much as possible to narrow down the data to the smallest possible segment. For example, make something similar to this in the first part of your WHERE clause:

  Invoice.TimeModified >= {ts'2003-09-01 17:01:09'} AND
  Invoice.TimeModified <= {ts'2003-09-02 17:01:09'}

我建议使用Optimizer. sp_optimizefullsync All

请参阅：如何设置 QODBC 优化器以及优化器选项在哪里，以了解有关优化器的所有详细信息。 (http://support.flexquarters.com/esupport/index.php?/Default/Knowledgebase/Article/View/2358/48/how-to-setup-qodbc-optimizer-and-where-are-the-optimizer-options)

  By default the optimizer will update new and changed entries in a table from QuickBooks first and then execute the query against the local optimized table. This is faster than reading everything out of QuickBooks every time, especially the more data you have. 

Answer 2

没用过这个驱动，试试这个：

SELECT * FROM Invoice WHERE TimeCreated > {d'2014-01-01 00:00:00.000'}

可能需要稍微修改一下日期字符串的格式，只是猜测。

就您的选择速度而言，如果查询具有 WHERE 子句，则可能会因表上没有索引而受到影响。有索引的表会比没有索引的表更快地返回结果。