在Google Appengine中创建自动递增列 [英] Creating Auto Incrementing column in Google Appengine

问题描述

基本上我想给每一行一个唯一的唯一的行row_number，这样我就可以解决只能在选择查询中获得前1000个结果的问题。因此，我可以在状态和我的表中的所有状态之间添加一个计数器。

解决方案

您不需要跟踪行号，您可以使用游标。

对于Java请参阅：

http://code.google.com/appengine/docs/java/datastore/queriesandindexes.html#Query_Cursors

对于Python，请参阅：

http://code.google.com/appengine/docs/python/datastore/queriesandindexes.html#Query_Cursors

What is the easiest and most efficient way to create an auto-increment counter for every data row in google appengine?

basically I want to give every row a unique row_number so that I can overcome the issue of only being able to get the first 1000 results in a select query. I can thus add a counter lies between condition and mine all the entires in the table.

解决方案

You don't need to keep track of row numbers, you can use cursors instead.

For Java see:

http://code.google.com/appengine/docs/java/datastore/queriesandindexes.html#Query_Cursors

For Python see:

http://code.google.com/appengine/docs/python/datastore/queriesandindexes.html#Query_Cursors

这篇关于在Google Appengine中创建自动递增列的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！