GQLQuery with_cursor不工作

Question

不知道是否有人知道为什么在GQLQuery中使用游标似乎不能正常工作。

我正在运行以下代码。

query = "SELECT * FROM myTable WHERE accountId = 'agdwMnBtZXNochALEglTTkFjY291bnQYpQEM' and lastUpdated > DATETIME('0001-01-01 00:00:00') ORDER BY lastUpdated ASC LIMIT 100"

if lastCursor:    
    dataLookup = GqlQuery(query).with_cursor(lastCursor)
else
    dataLookup = GqlQuery(query)

//dataLookup.count() here returns some value like 350

for dataItem in dataLookup:    
  ... do processing ...

myCursor = dataLookup.cursor()

dataLookup2 = GqlQuery(query).with_cursor(myCursor)

//dataLookup2.count() now returns 0, even though previously it indicates many more batches can be returned

谢谢你的帮助。

Answer 1

您不应该在查询中使用限制，因为这将只返回前100个结果，我假设您想要所有结果，但每次以100个为一批来处理它们。

下面是我要做的(基于你的示例代码)：

query = GqlQuery("SELECT * FROM myTable WHERE accountId = 
  'agdwMnBtZXNochALEglTTkFjY291bnQYpQEM' and 
  lastUpdated > DATETIME('0001-01-01 00:00:00') ORDER BY lastUpdated ASC")

dataLookup = query.fetch(100) # get first 100 results

for dataItem in dataLookup:
  # do processing

myCursor = query.cursor() # returns last entry of previous fetch

if myCursor:
  # get next 100 results
  dataLookup2 = query.with_cursor(myCursor).fetch(100)