blocks|key|1302120|text|您可以在运行服务器时使用clear+the+development+server+datastore命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1302121|/path/to/dev_appserver.py++--clear_datastore=yes++myapp|style|CODE|1302122|您也可以用-c缩写--clear_datastore。|1302123|entityMap|0|LINK|mutability|MUTABLE|url|https://cloud.google.com/appengine/docs/python/tools/devserver#Python_Using_the_Datastore^0|C|12|0|0|0|1J|0|5|2|9|H|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@$A|W|B|X|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|Y|8|@$A|Z|B|10|F|G]|$A|11|B|12|F|G]]|9|@]|C|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]]]

You can <a href="https://cloud.google.com/appengine/docs/python/tools/devserver#Python_Using_the_Datastore" rel="noreferrer">clear the development server datastore</a> when you run the server:

<code>/path/to/dev_appserver.py --clear_datastore=yes myapp</code>

You can also abbreviate <code>--clear_datastore</code> with <code>-c</code>.

blocks|key|1516845|text|如果您有大量数据，则需要使用脚本将其删除。不过，您可以使用remote_api以一种简单的方式从客户端清除数据存储。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1516846|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you have a significant amount of data, you need to use a script to delete it. You can use remote_api to clear the datastore from the client side in a straightforward manner, though.

blocks|key|1517334|text|在这里:转到Datastore+Admin，然后选择要删除的实体类型，然后单击Delete。Mapreduce将负责删除！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1517335|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Here you go: Go to Datastore Admin, and then select the Entity type you want to delete and click Delete. Mapreduce will take care of deleting!

blocks|key|1302177|text|零设置的方法是向管理服务发送一个执行任意代码的HTTP请求，而您正在运行的应用程序已经自动拥有该服务：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1302178|import+urllib
import+urllib2

urllib2.urlopen('http://localhost:8080/_ah/admin/interactive/execute',
++++data+=+urllib.urlencode({'code'+:+'from+google.appengine.ext+import+db\n'+%2B
++++++++++++++++++++++++++++++++++++++'db.delete(db.Query())'}))|code-block|syntax|javascript|1302179|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

The zero-setup way to do this is to send an execute-arbitrary-code HTTP request to the admin service that your running app already, automatically, has:

<pre><code>import urllib
import urllib2

urllib2.urlopen('http://localhost:8080/_ah/admin/interactive/execute',
 data = urllib.urlencode({'code' : 'from google.appengine.ext import db\n' +
 'db.delete(db.Query())'}))
</code></pre>

blocks|key|1301824|text|您可以使用web界面来完成此操作。登录到您的帐户，导航与左侧的链接。在数据存储管理中，您可以选择修改和删除数据。使用各自的选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1301825|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You can do it using the web interface. Login into your account, navigate with links on the left hand side. In Data Store management you have options to modify and delete data. Use respective options.

blocks|key|1301918|text|来源|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1301919|这是我从http://code.google.com/appengine/articles/remote_api.html那里得到的。|offset|length|1301920|创建交互控制台|1301921|首先，您需要定义一个交互式应用程序控制台。因此，创建一个名为appengine_console.py的文件，并输入以下内容：|1301922|#!/usr/bin/python
import+code
import+getpass
import+sys

#+These+are+for+my+OSX+installation.+Change+it+to+match+your+google_appengine+paths.+sys.path.append("/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine")
sys.path.append("/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/yaml/lib")

from+google.appengine.ext.remote_api+import+remote_api_stub
from+google.appengine.ext+import+db

def+auth_func():
++return+raw_input('Username:'),+getpass.getpass('Password:')

if+len(sys.argv)+<+2:
++print+"Usage:+%25s+app_id+[host]"+%25+(sys.argv[0],)
app_id+=+sys.argv[1]
if+len(sys.argv)+>+2:
++host+=+sys.argv[2]
else:
++host+=+'%25s.appspot.com'+%25+app_id

remote_api_stub.ConfigureRemoteDatastore(app_id,+'/remote_api',+auth_func,+host)

code.interact('App+Engine+interactive+console+for+%25s'+%25+(app_id,),+None,+locals())|code-block|syntax|javascript|1301923|创建Mapper基类|1301924|一旦准备就绪，就创建这个Mapper类。我刚刚创建了一个名为utils.py的新文件，并抛出了以下代码：|1301925|class+Mapper(object):
++#+Subclasses+should+replace+this+with+a+model+class+(eg,+model.Person).
++KIND+=+None

++#+Subclasses+can+replace+this+with+a+list+of+(property,+value)+tuples+to+filter+by.
++FILTERS+=+[]

++def+map(self,+entity):
++++"""Updates+a+single+entity.

++++Implementers+should+return+a+tuple+containing+two+iterables+(to_update,+to_delete).
++++"""
++++return+([],+[])

++def+get_query(self):
++++"""Returns+a+query+over+the+specified+kind,+with+any+appropriate+filters+applied."""
++++q+=+self.KIND.all()
++++for+prop,+value+in+self.FILTERS:
++++++q.filter("%25s+="+%25+prop,+value)
++++q.order("__key__")
++++return+q

++def+run(self,+batch_size=100):
++++"""Executes+the+map+procedure+over+all+matching+entities."""
++++q+=+self.get_query()
++++entities+=+q.fetch(batch_size)
++++while+entities:
++++++to_put+=+[]
++++++to_delete+=+[]
++++++for+entity+in+entities:
++++++++map_updates,+map_deletes+=+self.map(entity)
++++++++to_put.extend(map_updates)
++++++++to_delete.extend(map_deletes)
++++++if+to_put:
++++++++db.put(to_put)
++++++if+to_delete:
++++++++db.delete(to_delete)
++++++q+=+self.get_query()
++++++q.filter("__key__+>",+entities[-1].key())
++++++entities+=+q.fetch(batch_size)|1301926|Mapper应该只是一个抽象类，它允许您遍历给定类型的每个实体，无论是提取它们的数据，还是修改它们并将更新后的实体存储回数据存储。|1301927|带着它跑吧！|1301928|现在，启动appengine交互式控制台：|1301929|$python+appengine_console.py+<app_id_here>|1301930|这应该会启动交互式控制台。在其中创建Model的子类：|1301931|from+utils+import+Mapper
#+import+your+model+class+here+
class+MyModelDeleter(Mapper):
++++KIND+=+<model_name_here>

++++def+map(self,+entity):
++++++++return+([],+[entity])|1301932|最后，(从交互式控制台)运行它:+mapper+=+MyModelDeleter()+mapper.run()|1301933|就这样!|1301934|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/appengine/articles/remote_api.html^0|0|4|1L|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1J|8|@]|9|@$D|1K|E|1L|1|1M]]|A|$]]|$1|F|3|G|5|6|7|1N|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1O|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|1P|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1R|8|@]|9|@]|A|$]]|$1|S|3|T|5|L|7|1S|8|@]|9|@]|A|$M|N]]|$1|U|3|V|5|6|7|1T|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1U|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1V|8|@]|9|@]|A|$]]|$1|10|3|11|5|L|7|1W|8|@]|9|@]|A|$M|N]]|$1|12|3|13|5|6|7|1X|8|@]|9|@]|A|$]]|$1|14|3|15|5|L|7|1Y|8|@]|9|@]|A|$M|N]]|$1|16|3|17|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|18|3|19|5|6|7|20|8|@]|9|@]|A|$]]|$1|1A|3|-4|5|6|7|21|8|@]|9|@]|A|$]]]|1B|$1C|$5|1D|1E|1F|A|$1G|1H]]]]

<h2>Source</h2>

I got this from <a href="http://code.google.com/appengine/articles/remote_api.html" rel="nofollow noreferrer"><a href="http://code.google.com/appengine/articles/remote_api.html" rel="nofollow noreferrer">http://code.google.com/appengine/articles/remote_api.html</a></a>.
 

<h2>Create the Interactive Console</h2>

First, you need to define an interactive appenginge console. So, create a file called appengine_console.py and enter this:

<pre><code>#!/usr/bin/python
import code
import getpass
import sys

# These are for my OSX installation. Change it to match your google_appengine paths. sys.path.append("/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine")
sys.path.append("/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/yaml/lib")

from google.appengine.ext.remote_api import remote_api_stub
from google.appengine.ext import db

def auth_func():
 return raw_input('Username:'), getpass.getpass('Password:')

if len(sys.argv) &lt; 2:
 print "Usage: %s app_id [host]" % (sys.argv[0],)
app_id = sys.argv[1]
if len(sys.argv) &gt; 2:
 host = sys.argv[2]
else:
 host = '%s.appspot.com' % app_id

remote_api_stub.ConfigureRemoteDatastore(app_id, '/remote_api', auth_func, host)

code.interact('App Engine interactive console for %s' % (app_id,), None, locals())
</code></pre>

 

<h2>Create the Mapper base class</h2>

Once that's in place, create this Mapper class. I just created a new file called utils.py and threw this:

<pre><code>class Mapper(object):
 # Subclasses should replace this with a model class (eg, model.Person).
 KIND = None

 # Subclasses can replace this with a list of (property, value) tuples to filter by.
 FILTERS = []

 def map(self, entity):
 """Updates a single entity.

 Implementers should return a tuple containing two iterables (to_update, to_delete).
 """
 return ([], [])

 def get_query(self):
 """Returns a query over the specified kind, with any appropriate filters applied."""
 q = self.KIND.all()
 for prop, value in self.FILTERS:
 q.filter("%s =" % prop, value)
 q.order("__key__")
 return q

 def run(self, batch_size=100):
 """Executes the map procedure over all matching entities."""
 q = self.get_query()
 entities = q.fetch(batch_size)
 while entities:
 to_put = []
 to_delete = []
 for entity in entities:
 map_updates, map_deletes = self.map(entity)
 to_put.extend(map_updates)
 to_delete.extend(map_deletes)
 if to_put:
 db.put(to_put)
 if to_delete:
 db.delete(to_delete)
 q = self.get_query()
 q.filter("__key__ &gt;", entities[-1].key())
 entities = q.fetch(batch_size)
</code></pre>

Mapper is supposed to be just an abstract class that allows you to iterate over every entity of a given kind, be it to extract their data, or to modify them and store the updated entities back to the datastore.
 

<h2>Run with it!</h2>

Now, start your appengine interactive console:

<pre><code>$python appengine_console.py &lt;app_id_here&gt;
</code></pre>

That should start the interactive console. In it create a subclass of Model:

<pre><code>from utils import Mapper
# import your model class here 
class MyModelDeleter(Mapper):
 KIND = &lt;model_name_here&gt;

 def map(self, entity):
 return ([], [entity])
</code></pre>

And, finally, run it (from you interactive console):
mapper = MyModelDeleter()
mapper.run()

That's it!

blocks|key|1516991|text|我已经创建了一个外接程序面板，可以与您部署的App+Engine应用程序一起使用。它在下拉列表中列出了数据存储中存在的类型，您可以单击一个按钮来计划删除特定类型的所有实体或简单地删除所有实体的“任务”。你可以在这里下载：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1516992|http://code.google.com/p/jobfeed/wiki/Nuke|offset|length|1516993|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|16|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

I've created an add-in panel that can be used with your deployed App Engine apps. It lists the kinds that are present in the datastore in a dropdown, and you can click a button to schedule "tasks" that delete all entities of a specific kind or simply everything. You can download it here: 
<a href="http://code.google.com/p/jobfeed/wiki/Nuke" rel="nofollow noreferrer">http://code.google.com/p/jobfeed/wiki/Nuke</a>

blocks|key|1302325|text|打开应用程序的"Datastore+Admin“并启用Admin。然后，您的所有实体都将与复选框一起列出。您可以简单地选择不需要的实体并将其删除。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1302326|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Open "Datastore Admin" for your application and enable Admin. Then all of your entities will be listed with check boxes. You can simply select the unwanted entites and delete them.

blocks|key|1516944|text|如果您有大量数据，使用web界面可能会很耗时。App+Engine+Launcher实用程序允许您使用“启动时清除数据存储”复选框一次性删除所有内容。该工具现在可用于Windows和Mac+(Python框架)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1516945|entityMap|0|LINK|mutability|MUTABLE|url|http://googleappengine.blogspot.com/2009/09/app-engine-launcher-for-windows.html^0|N|J|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

If you have a lot of data, using the web interface could be time consuming. The <a href="http://googleappengine.blogspot.com/2009/09/app-engine-launcher-for-windows.html" rel="nofollow noreferrer">App Engine Launcher</a> utility lets you delete everything in one go with the 'Clear datastore on launch' checkbox. This utility is now available for both Windows and Mac (Python framework).

blocks|key|1517380|text|对于开发服务器，您可以从终端运行它，而不是通过google+app+engine启动器运行服务器，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1517381|dev_appserver.py+--端口=端口号--清除数据存储区=是应用程序名称|1517382|例如:我的应用程序"reader“在端口15080上运行。在修改代码并重新启动服务器之后，我只需运行"dev_appserver.py+--port=15080+--clear_datastore=yes+reader“。|1517383|这对我有好处。|1517384|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

For the development server, instead of running the server through the google app engine launcher, you can run it from the terminal like:

dev_appserver.py --port=[portnumber] --clear_datastore=yes [nameofapplication]

ex: my application "reader" runs on port 15080. After modify the code and restart the server, I just run "dev_appserver.py --port=15080 --clear_datastore=yes reader". 

It's good for me.

blocks|key|1302458|text|添加关于最新发展的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1302459|谷歌最近添加了数据存储管理功能。您可以使用此主机将您的实体备份、删除或复制到其他应用程序。|1302460|https://developers.google.com/appengine/docs/adminconsole/datastoreadmin#Deleting_Entities_in_Bulk|offset|length|1302461|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|2Q|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@$F|R|G|S|1|T]]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|E]]]]

Adding answer about recent developments.

Google recently added datastore admin feature. You can backup, delete or copy your entities to another app using this console.

<a href="https://developers.google.com/appengine/docs/adminconsole/datastoreadmin#Deleting_Entities_in_Bulk" rel="nofollow">https://developers.google.com/appengine/docs/adminconsole/datastoreadmin#Deleting_Entities_in_Bulk</a>

blocks|key|1302291|text|我通常不想删除所有的数据存储，所以我从源代码控制中取出了/war/WEB-INF/local_db.bin的干净副本。它可能只是我，但它似乎即使与开发模式停止，我必须在物理上删除该文件，然后再拉它。这是在Windows上使用Eclipse的subversion插件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1302292|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I often don't want to delete all the data store so I pull a clean copy of /war/WEB-INF/local_db.bin out source control. It may just be me but it seems even with the Dev Mode stopped I have to physically remove the file before pulling it. This is on Windows using the subversion plugin for Eclipse.

blocks|key|1302199|text|PHP变体：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1302200|import+com.google.appengine.api.datastore.Query;
import+com.google.appengine.api.datastore.DatastoreServiceFactory;

define('DATASTORE_SERVICE',+DatastoreServiceFactory::getDatastoreService());

function+get_all($kind)+{
++++$query+=+new+Query($kind);
++++$prepared+=+DATASTORE_SERVICE->prepare($query);
++++return+$prepared->asIterable();
}

function+delete_all($kind,+$amount+=+0)+{
++++if+($entities+=+get_all($kind))+{
++++++++$r+=+$t+=+0;
++++++++$delete+=+array();
++++++++foreach+($entities+as+$entity)+{
++++++++++++if+($r+<+500)+{
++++++++++++++++$delete[]+=+$entity->getKey();
++++++++++++}+else+{
++++++++++++++++DATASTORE_SERVICE->delete($delete);
++++++++++++++++$delete+=+array();
++++++++++++++++$r+=+-1;
++++++++++++}
++++++++++++$r%2B%2B;+$t%2B%2B;
++++++++++++if+($amount+&&+$amount+<+$t)+break;
++++++++}
++++++++if+($delete)+{
++++++++++++DATASTORE_SERVICE->delete($delete);
++++++++}
++++}
}|code-block|syntax|javascript|1302201|是的，这需要时间和30秒。是有限度的。我正在考虑把ajax应用程序样本放到超过30秒的自动化。|1302202|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

PHP variation:

<pre><code>import com.google.appengine.api.datastore.Query;
import com.google.appengine.api.datastore.DatastoreServiceFactory;

define('DATASTORE_SERVICE', DatastoreServiceFactory::getDatastoreService());

function get_all($kind) {
 $query = new Query($kind);
 $prepared = DATASTORE_SERVICE-&gt;prepare($query);
 return $prepared-&gt;asIterable();
}

function delete_all($kind, $amount = 0) {
 if ($entities = get_all($kind)) {
 $r = $t = 0;
 $delete = array();
 foreach ($entities as $entity) {
 if ($r &lt; 500) {
 $delete[] = $entity-&gt;getKey();
 } else {
 DATASTORE_SERVICE-&gt;delete($delete);
 $delete = array();
 $r = -1;
 }
 $r++; $t++;
 if ($amount &amp;&amp; $amount &lt; $t) break;
 }
 if ($delete) {
 DATASTORE_SERVICE-&gt;delete($delete);
 }
 }
}
</code></pre>

Yes it will take time and 30 sec. is a limit. I'm thinking to put an ajax app sample to automate beyond 30 sec.

blocks|key|1302218|text|for+amodel+in+db.Model.__subclasses__():
++++++++++++++++dela=[]
++++++++++++++++print+amodel
++++++++++++++++try:
++++++++++++++++++++m+=+amodel()
++++++++++++++++++++mq+=+m.all()
++++++++++++++++++++print+mq.count()
++++++++++++++++++++for+mw+in+mq:
++++++++++++++++++++++++dela.append(mw)
++++++++++++++++++++db.delete(dela)
++++++++++++#~+print+len(dela)

++++++++++++++++except:
++++++++++++++++++++pass|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1302219|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>for amodel in db.Model.__subclasses__():
 dela=[]
 print amodel
 try:
 m = amodel()
 mq = m.all()
 print mq.count()
 for mw in mq:
 dela.append(mw)
 db.delete(dela)
 #~ print len(dela)

 except:
 pass
</code></pre>

blocks|key|1302512|text|如果您使用的是ndb，那么我使用的方法就是清除数据存储：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1302513|ndb.delete_multi(ndb.Query(default_options=ndb.QueryOptions(keys_only=True)))|code-block|syntax|javascript|1302514|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you're using ndb, the method that worked for me for clearing the datastore:

<pre><code>ndb.delete_multi(ndb.Query(default_options=ndb.QueryOptions(keys_only=True)))
</code></pre>

blocks|key|1302556|text|对于应用程序引擎上的任何数据存储，而不是本地数据存储，您可以使用new+Datastore+API。这是a+primer+for+how+to+get+started。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1302557|我写了一个删除所有非内置实体的脚本。该应用编程接口变化很快，因此为了参考，我在提交990ab5c7f2063e8147bcc56ee222836fd3d6e15b时克隆了它|1302558|from+gcloud+import+datastore
from+gcloud.datastore+import+SCOPE
from+gcloud.datastore.connection+import+Connection
from+gcloud.datastore+import+query

from+oauth2client+import+client

def+get_connection():
++client_email+=+'XXXXXXXX@developer.gserviceaccount.com'
++private_key_string+=+open('/path/to/yourfile.p12',+'rb').read()

++svc_account_credentials+=+client.SignedJwtAssertionCredentials(
++++service_account_name=client_email,
++++private_key=private_key_string,
++++scope=SCOPE)

++return+Connection(credentials=svc_account_credentials)


def+connect_to_dataset(dataset_id):
++connection+=+get_connection()
++datastore.set_default_connection(connection)
++datastore.set_default_dataset_id(dataset_id)

if+__name__+==+"__main__":
++connect_to_dataset(DATASET_NAME)
++gae_entity_query+=+query.Query()
++gae_entity_query.keys_only()
++for+entity+in+gae_entity_query.fetch():
++++if+entity.kind[0]+!=+'_':
++++++print+entity.kind
++++++entity.key.delete()|code-block|syntax|javascript|1302559|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/GoogleCloudPlatform/gcloud-python/|1|https://cloud.google.com/datastore/docs/getstarted/start_python/|2|https://github.com/GoogleCloudPlatform/gcloud-python/tree/990ab5c7f2063e8147bcc56ee222836fd3d6e15b^0|W|H|0|1G|V|1|0|15|14|2|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]|$A|10|B|11|1|12]]|C|$]]|$1|D|3|E|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|F|3|G|5|H|7|17|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|18|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]|U|$5|N|O|P|C|$Q|V]]]]

For any datastore that's on app engine, rather than local, you can use the <a href="https://github.com/GoogleCloudPlatform/gcloud-python/" rel="nofollow">new Datastore API</a>. Here's <a href="https://cloud.google.com/datastore/docs/getstarted/start_python/" rel="nofollow">a primer for how to get started</a>.

I wrote a script that deletes all non-built in entities. The API is changing pretty rapidly, so for reference, I cloned it at commit <a href="https://github.com/GoogleCloudPlatform/gcloud-python/tree/990ab5c7f2063e8147bcc56ee222836fd3d6e15b" rel="nofollow">990ab5c7f2063e8147bcc56ee222836fd3d6e15b</a>

<pre><code>from gcloud import datastore
from gcloud.datastore import SCOPE
from gcloud.datastore.connection import Connection
from gcloud.datastore import query

from oauth2client import client

def get_connection():
 client_email = 'XXXXXXXX@developer.gserviceaccount.com'
 private_key_string = open('/path/to/yourfile.p12', 'rb').read()

 svc_account_credentials = client.SignedJwtAssertionCredentials(
 service_account_name=client_email,
 private_key=private_key_string,
 scope=SCOPE)

 return Connection(credentials=svc_account_credentials)


def connect_to_dataset(dataset_id):
 connection = get_connection()
 datastore.set_default_connection(connection)
 datastore.set_default_dataset_id(dataset_id)

if __name__ == "__main__":
 connect_to_dataset(DATASET_NAME)
 gae_entity_query = query.Query()
 gae_entity_query.keys_only()
 for entity in gae_entity_query.fetch():
 if entity.kind[0] != '_':
 print entity.kind
 entity.key.delete()
</code></pre>

blocks|key|1517539|text|对于java|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1517540|DatastoreService+db+=+DatastoreServiceFactory.getDatastoreService();
List<Key>+keys+=+new+ArrayList<Key>();
for(Entity+e+:+db.prepare(new+Query().setKeysOnly()).asIterable())
++++keys.add(e.getKey());
db.delete(keys);|code-block|syntax|javascript|1517541|在Development+Server中运行良好|1517542|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

For java

<pre><code>DatastoreService db = DatastoreServiceFactory.getDatastoreService();
List&lt;Key&gt; keys = new ArrayList&lt;Key&gt;();
for(Entity e : db.prepare(new Query().setKeysOnly()).asIterable())
 keys.add(e.getKey());
db.delete(keys);
</code></pre>

Works well in Development Server

blocks|key|1302625|text|你有两个简单的方法，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1302626|#1:为了节省成本，删除整个项目|1302627|#2:使用ts-datastore-orm：|1302628|https://www.npmjs.com/package/ts-datastore-orm等待Entity.truncate()；截断可以每秒删除大约1K行|offset|length|1302629|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.com/package/ts-datastore-orm^0|0|0|0|0|1A|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@$H|V|I|W|1|X]]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

You have 2 simple ways,
#1: To save cost, delete the entire project
#2: using ts-datastore-orm:
<a href="https://www.npmjs.com/package/ts-datastore-orm" rel="nofollow noreferrer">https://www.npmjs.com/package/ts-datastore-orm</a>
await Entity.truncate();
The truncate can delete around 1K rows per seconds

blocks|key|1302665|text|下面是我如何用python3在一个普通的Google+Cloud+Shell+(无GAE)中天真地做到这一点|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1302666|from+google.cloud+import+datastore
client+=+datastore.Client()
query.keys_only()
for+counter,+entity+in+enumerate(query.fetch()):
++++if+entity.kind.startswith('_'):++#+skip+reserved+kinds
++++++++continue
++++print(f"{counter}:+{entity.key}")
++++client.delete(entity.key)|code-block|syntax|javascript|1302667|即使使用相对较少的密钥，这也需要很长的时间，但它是有效的。|1302668|有关Python客户端库的更多信息：https://googleapis.dev/python/datastore/latest/client.html|1302669|entityMap|0|LINK|mutability|MUTABLE|url|https://shell.cloud.google.com/|1|https://googleapis.dev/python/datastore/latest/client.html^0|7|7|K|I|0|0|0|0|I|1M|1|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|15|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|16|8|@]|D|@$9|17|A|18|1|19]]|E|$]]|$1|O|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]]]

Here's how I did this naively from a vanilla <a href="https://shell.cloud.google.com/" rel="nofollow noreferrer">Google Cloud Shell</a> (no GAE) with <code>python3</code>:
<pre class="lang-py prettyprint-override"><code>from google.cloud import datastore
client = datastore.Client()
query.keys_only()
for counter, entity in enumerate(query.fetch()):
 if entity.kind.startswith('_'): # skip reserved kinds
 continue
 print(f&quot;{counter}: {entity.key}&quot;)
 client.delete(entity.key)
</code></pre>
This takes a very long time even with a relatively small amount of keys but it works.
More info about the Python client library: <a href="https://googleapis.dev/python/datastore/latest/client.html" rel="nofollow noreferrer">https://googleapis.dev/python/datastore/latest/client.html</a>

Does anyone know how to delete all datastore in <a href="http://en.wikipedia.org/wiki/Google_App_Engine" rel="noreferrer">Google App Engine</a>?

How to delete all datastore in Google App Engine?

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问如何删除Google App Engine中的所有数据存储？
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