我在这里看到了GQL语法:https://developers.google.com/appengine/docs/python/datastore/gqlreference和这里:https://developers.google.com/datastore/docs/concepts/gql_reference . 非常相似,但我并不完全确定 .
例如,对于Google应用引擎中的绑定参数值,使用如下:
employees_trained = db.GqlQuery("SELECT * FROM Employee WHERE email IN :1",
training_registration_list)
在论证之前使用“:”,但对于Google Cloud Datastore,使用“@”,如下所示:
query_string = ('SELECT * FROM Person WHERE height >= @minHeight '
'AND height <= @maxHeight')
gql_query.query_string = query_string
query_arg = gql_query.name_arg.add()
query_arg.name = 'minHeight'
query_arg.value.integer_value = 48
query_arg = gql_query.name_arg.add()
query_arg.name = 'maxHeight'
query_arg.value.integer_value = 60
很抱歉,如果这是一个愚蠢的问题,但我不确定在Google App Engine和Google Cloud Datastore中是否使用相同的GQL
提前致谢!
1 回答
您链接的页面包含完整的差异列表:https://developers.google.com/datastore/docs/concepts/gql_reference#unsupported_features_and_behavior_differences_from_mysqlpython_gql(单击选项卡"Python GQL for App Engine differences") .