本文整理汇总了Python中boto.dynamodb2.layer1.DynamoDBConnection.get_item方法的典型用法代码示例。如果您正苦于以下问题：Python DynamoDBConnection.get_item方法的具体用法？Python DynamoDBConnection.get_item怎么用？Python DynamoDBConnection.get_item使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类boto.dynamodb2.layer1.DynamoDBConnection的用法示例。
在下文中一共展示了DynamoDBConnection.get_item方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: Table
# 需要导入模块: from boto.dynamodb2.layer1 import DynamoDBConnection [as 别名]
# 或者: from boto.dynamodb2.layer1.DynamoDBConnection import get_item [as 别名]
#.........这里部分代码省略.........
True
"""
self.connection.delete_table(self.table_name)
return True
def _encode_keys(self, keys):
"""
Given a flat Python dictionary of keys/values, converts it into the
nested dictionary DynamoDB expects.
Converts::
{
'username': 'john',
'tags': [1, 2, 5],
}
...to...::
{
'username': {'S': 'john'},
'tags': {'NS': ['1', '2', '5']},
}
"""
raw_key = {}
for key, value in keys.items():
raw_key[key] = self._dynamizer.encode(value)
return raw_key
def get_item(self, consistent=False, **kwargs):
"""
Fetches an item (record) from a table in DynamoDB.
To specify the key of the item you'd like to get, you can specify the
key attributes as kwargs.
Optionally accepts a ``consistent`` parameter, which should be a
boolean. If you provide ``True``, it will perform
a consistent (but more expensive) read from DynamoDB.
(Default: ``False``)
Returns an ``Item`` instance containing all the data for that record.
Example::
# A simple hash key.
>>> john = users.get_item(username='johndoe')
>>> john['first_name']
'John'
# A complex hash+range key.
>>> john = users.get_item(username='johndoe', last_name='Doe')
>>> john['first_name']
'John'
# A consistent read (assuming the data might have just changed).
>>> john = users.get_item(username='johndoe', consistent=True)
>>> john['first_name']
'Johann'
# With a key that is an invalid variable name in Python.
# Also, assumes a different schema than previous examples.示例2: DynamoDBv2Layer1Test
# 需要导入模块: from boto.dynamodb2.layer1 import DynamoDBConnection [as 别名]
# 或者: from boto.dynamodb2.layer1.DynamoDBConnection import get_item [as 别名]
#.........这里部分代码省略.........
else:
time.sleep(5)
else:
return result
def test_integrated(self):
result = self.create_table(
self.table_name,
self.attributes,
self.schema,
self.provisioned_throughput,
self.lsi
)
self.assertEqual(
result['TableDescription']['TableName'],
self.table_name
)
description = self.dynamodb.describe_table(self.table_name)
self.assertEqual(description['Table']['ItemCount'], 0)
# Create some records.
record_1_data = {
'username': {'S': 'johndoe'},
'first_name': {'S': 'John'},
'last_name': {'S': 'Doe'},
'date_joined': {'N': '1366056668'},
'friend_count': {'N': '3'},
'friends': {'SS': ['alice', 'bob', 'jane']},
}
r1_result = self.dynamodb.put_item(self.table_name, record_1_data)
# Get the data.
record_1 = self.dynamodb.get_item(self.table_name, key={
'username': {'S': 'johndoe'},
'date_joined': {'N': '1366056668'},
}, consistent_read=True)
self.assertEqual(record_1['Item']['username']['S'], 'johndoe')
self.assertEqual(record_1['Item']['first_name']['S'], 'John')
self.assertEqual(record_1['Item']['friends']['SS'], [
'alice', 'bob', 'jane'
])
# Now in a batch.
self.dynamodb.batch_write_item({
self.table_name: [
{
'PutRequest': {
'Item': {
'username': {'S': 'jane'},
'first_name': {'S': 'Jane'},
'last_name': {'S': 'Doe'},
'date_joined': {'N': '1366056789'},
'friend_count': {'N': '1'},
'friends': {'SS': ['johndoe']},
},
},
},
]
})
# Now a query.
lsi_results = self.dynamodb.query(
self.table_name,
index_name='MostRecentIndex',
key_conditions={示例3: Table
# 需要导入模块: from boto.dynamodb2.layer1 import DynamoDBConnection [as 别名]
# 或者: from boto.dynamodb2.layer1.DynamoDBConnection import get_item [as 别名]
#.........这里部分代码省略.........
True
"""
self.connection.delete_table(self.table_name)
return True
def _encode_keys(self, keys):
"""
Given a flat Python dictionary of keys/values, converts it into the
nested dictionary DynamoDB expects.
Converts::
{
'username': 'john',
'tags': [1, 2, 5],
}
...to...::
{
'username': {'S': 'john'},
'tags': {'NS': ['1', '2', '5']},
}
"""
raw_key = {}
for key, value in keys.items():
raw_key[key] = self._dynamizer.encode(value)
return raw_key
def get_item(self, consistent=False, attributes=None, **kwargs):
"""
Fetches an item (record) from a table in DynamoDB.
To specify the key of the item you'd like to get, you can specify the
key attributes as kwargs.
Optionally accepts a ``consistent`` parameter, which should be a
boolean. If you provide ``True``, it will perform
a consistent (but more expensive) read from DynamoDB.
(Default: ``False``)
Optionally accepts an ``attributes`` parameter, which should be a
list of fieldname to fetch. (Default: ``None``, which means all fields
should be fetched)
Returns an ``Item`` instance containing all the data for that record.
Example::
# A simple hash key.
>>> john = users.get_item(username='johndoe')
>>> john['first_name']
'John'
# A complex hash+range key.
>>> john = users.get_item(username='johndoe', last_name='Doe')
>>> john['first_name']
'John'
# A consistent read (assuming the data might have just changed).
>>> john = users.get_item(username='johndoe', consistent=True)
>>> john['first_name']