[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["難以理解","hardToUnderstand","thumb-down"],["資訊或程式碼範例有誤","incorrectInformationOrSampleCode","thumb-down"],["缺少我需要的資訊/範例","missingTheInformationSamplesINeed","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["上次更新時間：2025-09-04 (世界標準時間)。"],[[["\u003cp\u003eThis API, located in the \u003ccode\u003egoogle.appengine.ext.ndb.metadata\u003c/code\u003e module, is designed for use in first-generation runtimes within the App Engine standard environment, and users migrating to Python 3 should consult the migration guide.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eget_entity_group_version(key)\u003c/code\u003e function retrieves the version of an entity group, which increases with every change, potentially even without user-visible updates, and a workaround is available for maintaining legacy behavior.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eget_namespaces(start=None, end=None)\u003c/code\u003e, \u003ccode\u003eget_kinds(start=None, end=None)\u003c/code\u003e, \u003ccode\u003eget_properties_of_kind(kind, start=None, end=None)\u003c/code\u003e and \u003ccode\u003eget_representations_of_kind(kind, start=None, end=None)\u003c/code\u003e functions are used to list namespace names, kind names, property names and representation names respectively, with options for specifying alphabetical start and end boundaries.\u003c/p\u003e\n"],["\u003cp\u003eThe document outlines the various property classes and their corresponding representation types, such as \u003ccode\u003eStringProperty\u003c/code\u003e to \u003ccode\u003eSTRING\u003c/code\u003e and \u003ccode\u003eIntegerProperty\u003c/code\u003e to \u003ccode\u003eINT64\u003c/code\u003e, for different data types.\u003c/p\u003e\n"]]],[],null,["# NDB Metadata Reference\n\n| This page describes how to use the legacy bundled services and APIs. This API can only run in first-generation runtimes in the App Engine standard environment. If you are updating to the App Engine Python 3 runtime, refer to the [migration guide](/appengine/migration-center/standard/migrate-to-second-gen/python-differences) to learn about your migration options for legacy bundled services.\n\nThis API is in the `google.appengine.ext.ndb.metadata` module,\ntypically used via\n`from google.appengine.ext.ndb import metadata`.\n\nFunctions\n---------\n\nget_entity_group_version(key)\n: Return the version of the entity group containing key.\n This version is\n guaranteed to increase on every change to the entity group. The version may\n increase even in the absence of user-visible changes to the entity\n group. May return `None`\n if the entity group was never written to.\n\n **Warning** : The behavior of entity group metadata is now different. The entity\n group version can increase independently of user updates. Previously, the entity\n group version increased only on user update. To maintain legacy behavior, use the\n [entity group version workaround](https://support.google.com/cloud/answer/9133787#zippy=python-ndb).\n\n **Arguments**\n\n key\n : key for an entity group.\n\n\nget_namespaces(start=None, end=None)\n\n: Returns a list of namespace names. **Arguments**\n\n start\n : Don't return namespace names before this in alphabetical order.\n\n end\n : Don't return namespace names after this in alphabetical order.\n\nget_kinds(start=None, end=None):\n\n: Returns a list of kind names in the current namespace. **Arguments**\n\n start\n : Don't return kind names before this in alphabetical order.\n\n end\n : Don't return kind names after this in alphabetical order.\n\nget_properties_of_kind(kind, start=None,\nend=None):\n: Returns a list of property names for the given \u003cvar translate=\"no\"\u003ekind\u003c/var\u003e name\n in the current namespace.\n\n **Arguments**\n\n kind\n : Which kind's properties to list.\n\n start\n : Don't return property names before this in alphabetical order.\n\n end\n : Don't return property names after this in alphabetical order.\n\n\nget_representations_of_kind(kind, start=None,\nend=None)\n: Returns a `dict` mapping property names for the given kind name\n to lists of representation names such as 'STRING', 'BOOLEAN' or 'INT64'.\n Only looks in the current namespace.\n For a complete list of these types, see\n [Representation Types](#representations)\n\n: Returns a list of property names for the given \u003cvar translate=\"no\"\u003ekind\u003c/var\u003e name.\n\n **Arguments**\n\n kind\n : Which kind's properties to list.\n\n start\n : Don't return property names before this in alphabetical order.\n\n end\n : Don't return property names after this in alphabetical order.\n\nRepresentation Types\n--------------------"]]
