def test_get_item(self):
"""
Connection.get_item
"""
conn = Connection(self.region)
table_name = 'Thread'
with patch(PATCH_METHOD) as req:
req.return_value = HttpOK(), DESCRIBE_TABLE_DATA
conn.describe_table(table_name)
with patch(PATCH_METHOD) as req:
req.return_value = HttpOK(), GET_ITEM_DATA
item = conn.get_item(table_name, "Amazon DynamoDB", "How do I update multiple items?")
self.assertEqual(item, GET_ITEM_DATA)
with patch(PATCH_METHOD) as req:
req.return_value = HttpBadRequest(), None
self.assertRaises(
GetError,
conn.get_item,
table_name,
"Amazon DynamoDB",
"How do I update multiple items?"
)
with patch(PATCH_METHOD) as req:
req.return_value = HttpOK(), GET_ITEM_DATA
conn.get_item(
table_name,
"Amazon DynamoDB",
"How do I update multiple items?",
attributes_to_get=['ForumName']
)
params = {
'return_consumed_capacity': 'TOTAL',
'attributes_to_get': ['ForumName'],
'key': {
'ForumName': {
'S': 'Amazon DynamoDB'
},
'Subject': {
'S': 'How do I update multiple items?'
}
},
'consistent_read': False,
'table_name': 'Thread'
}
self.assertEqual(req.call_args[1], params)
"""
Examples using a connection
"""
from pynamodb.connection import Connection
# Get a connection
conn = Connection(host='http://localhost:8000')
print(conn)
# List tables
print(conn.list_tables())
# Describe a table
print(conn.describe_table('Thread'))
# Get an item
print(conn.get_item('Thread', 'hash-key', 'range-key'))
# Put an item
conn.put_item('Thread',
'hash-key',
'range-key',
attributes={
'forum_name': 'value',
'subject': 'value'
})
# Delete an item
conn.delete_item('Thread', 'hash-key', 'range-key')
def test_connection_integration(ddb_url):
table_name = 'pynamodb-ci-connection'
# For use with a fake dynamodb connection
# See: http://aws.amazon.com/dynamodb/developer-resources/
conn = Connection(host=ddb_url)
print(conn)
print("conn.describe_table...")
table = None
try:
table = conn.describe_table(table_name)
except TableDoesNotExist:
params = {
'read_capacity_units':
1,
'write_capacity_units':
1,
'attribute_definitions': [{
'attribute_type': STRING,
'attribute_name': 'Forum'
}, {
'attribute_type': STRING,
'attribute_name': 'Thread'
}, {
'attribute_type': STRING,
'attribute_name': 'AltKey'
}, {
'attribute_type': NUMBER,
'attribute_name': 'number'
}],
'key_schema': [{
'key_type': HASH,
'attribute_name': 'Forum'
}, {
'key_type': RANGE,
'attribute_name': 'Thread'
}],
'global_secondary_indexes': [{
'index_name':
'alt-index',
'key_schema': [{
'KeyType': 'HASH',
'AttributeName': 'AltKey'
}],
'projection': {
'ProjectionType': 'KEYS_ONLY'
},
'provisioned_throughput': {
'ReadCapacityUnits': 1,
'WriteCapacityUnits': 1,
}
}],
'local_secondary_indexes': [{
'index_name':
'view-index',
'key_schema': [{
'KeyType': 'HASH',
'AttributeName': 'Forum'
}, {
'KeyType': 'RANGE',
'AttributeName': 'AltKey'
}],
'projection': {
'ProjectionType': 'KEYS_ONLY'
}
}]
}
print("conn.create_table...")
conn.create_table(table_name, **params)
while table is None:
time.sleep(1)
table = conn.describe_table(table_name)
while table['TableStatus'] == 'CREATING':
time.sleep(2)
table = conn.describe_table(table_name)
print("conn.list_tables")
conn.list_tables()
print("conn.update_table...")
conn.update_table(table_name,
read_capacity_units=table.get(
PROVISIONED_THROUGHPUT).get(READ_CAPACITY_UNITS) + 1,
write_capacity_units=2)
table = conn.describe_table(table_name)
while table['TableStatus'] != 'ACTIVE':
time.sleep(2)
table = conn.describe_table(table_name)
print("conn.put_item")
conn.put_item(
table_name,
'item1-hash',
range_key='item1-range',
attributes={'foo': {
'S': 'bar'
}},
condition=NotExists(Path('Forum')),
)
conn.get_item(table_name, 'item1-hash', range_key='item1-range')
conn.delete_item(table_name, 'item1-hash', range_key='item1-range')
items = []
for i in range(10):
items.append({"Forum": "FooForum", "Thread": f"thread-{i}"})
print("conn.batch_write_items...")
conn.batch_write_item(table_name, put_items=items)
print("conn.batch_get_items...")
data = conn.batch_get_item(table_name, items)
print("conn.query...")
conn.query(
table_name,
"FooForum",
range_key_condition=(BeginsWith(Path('Thread'), Value('thread'))),
)
print("conn.scan...")
conn.scan(table_name, )
print("conn.delete_table...")
conn.delete_table(table_name)
"""
Examples using a connection
"""
from __future__ import print_function
from pynamodb.connection import Connection
# Get a connection
conn = Connection(host='http://localhost:8000')
print(conn)
# List tables
print(conn.list_tables())
# Describe a table
print(conn.describe_table('Thread'))
# Get an item
print(conn.get_item('Thread', 'hash-key', 'range-key'))
# Put an item
conn.put_item('Thread', 'hash-key', 'range-key', attributes={'forum_name': 'value', 'subject': 'value'})
# Delete an item
conn.delete_item('Thread', 'hash-key', 'range-key')
# You can also use update_table to change the Provisioned Throughput capacity of Global Secondary Indexes:
kwargs = {
'global_secondary_index_updates': [{
'index_name': 'index_name',
'read_capacity_units': 10,
'write_capacity_units': 10
}]
}
conn.update_table('table_name', **kwargs)
# Modifying items
# The low level API can perform item operations too, such as getting an item:
conn.get_item('table_name', 'hash_key', 'range_key')
# You can put items as well, specifying the keys and any other attributes:
conn.put_item('table_name',
'hash_key',
'range_key',
attributes={'key': 'value'})
# Deleting an item has similar syntax:
conn.delete_item('table_name', 'hash_key', 'range_key')
# AWS Access
# https://pynamodb.readthedocs.io/en/latest/awsaccess.html
'''
PynamoDB uses botocore to interact with the DynamoDB API. Thus, any method of configuration supported by botocore works with PynamoDB. For local development the use of environment variables such as AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY is probably preferable. You can of course use IAM users, as recommended by AWS. In addition EC2 roles will work as well and would be recommended when running on EC2.
while table['TableStatus'] != 'ACTIVE':
time.sleep(2)
table = conn.describe_table(table_name)
print("conn.put_item")
conn.put_item(
table_name,
'item1-hash',
range_key='item1-range',
attributes={'foo': {'S': 'bar'}},
expected={'Forum': {'Exists': False}}
)
conn.get_item(
table_name,
'item1-hash',
range_key='item1-range'
)
conn.delete_item(
table_name,
'item1-hash',
range_key='item1-range'
)
items = []
for i in range(10):
items.append(
{"Forum": "FooForum", "Thread": "thread-{0}".format(i)}
)
print("conn.batch_write_items...")
conn.batch_write_item(
while table['TableStatus'] != 'ACTIVE':
time.sleep(2)
table = conn.describe_table(table_name)
print("conn.put_item")
conn.put_item(table_name,
'item1-hash',
range_key='item1-range',
attributes={'foo': {
'S': 'bar'
}},
expected={'Forum': {
'Exists': False
}})
conn.get_item(table_name, 'item1-hash', range_key='item1-range')
conn.delete_item(table_name, 'item1-hash', range_key='item1-range')
items = []
for i in range(10):
items.append({"Forum": "FooForum", "Thread": "thread-{0}".format(i)})
print("conn.batch_write_items...")
conn.batch_write_item(table_name, put_items=items)
print("conn.batch_get_items...")
data = conn.batch_get_item(table_name, items)
print("conn.query...")
conn.query(table_name,
"FooForum",
key_conditions={
'Thread': {
'ComparisonOperator': 'BEGINS_WITH',