Welcome to ssdb-py’s documentation!¶

What is SSDB?¶

SSDB is a fast NoSQL database for storing big list of billions of elements.

SSDB is stable, production-ready and is widely used by many Internet companies including QIHU 360. It’s repository is https://github.com/ideawu/ssdb

About ssdb-py¶

ssdb-py is a ssdb python client like redis. It provides two types of connection-pool and a group of functions of ssdb.

It’s repository is https://github.com/wrongwaycn/ssdb-py

Quickstart¶

>>> from ssdb import SSDB
>>> import time
>>> ssdb = SSDB(host='127.0.0.1', port=8888)
>>> ssdb.multi_set(set_a='a', set_b='b', set_c='c', set_d='d')
4
>>> ssdb.multi_set(set_x1='x1', set_x2='x2', set_x3='x3', set_x4='x4')
4
>>> ssdb.multi_set(set_abc='abc', set_count=10)
2
>>> ssdb.multi_hset('hash_1', a='A', b='B', c='C', d='D', e='E', f='F',
...                 g='G')
7
>>> ssdb.multi_hset('hash_2',
...                 key1=42,
...                 key2=3.1415926,
...                 key3=-1.41421,
...                 key4=256,
...                 key5='e',
...                 key6='log'
...                )
6
>>> ssdb.multi_zset('zset_1', a=30, b=20, c=100, d=1, e=64, f=-3,
...                 g=0)
7
>>> ssdb.multi_hset('zset_2',
...                 key1=42,
...                 key2=314,
...                 key3=1,
...                 key4=256,
...                 key5=0,
...                 key6=-5
...                )
6
>>> ssdb.get('set_a')
'a'
>>> ssdb.setx('set_ttl', 'ttl', 5)
True
>>> ssdb.get('set_ttl')
'ttl'
>>> time.sleep(5)
>>> ssdb.get('set_ttl')
>>>
>>> ssdb.exists('set_a')
True
>>> ssdb.incr('set_count', 3)
13
>>> ssdb.multi_get('a', 'b', 'c', 'd')
{'a': 'a', 'c': 'c', 'b': 'b', 'd': 'd'}
>>> ssdb.keys('set_x ', 'set_xx', 3)
['set_x1', 'set_x2', 'set_x3']
>>> ssdb.scan('set_x ', '', 10)
{'set_x1': 'x1', 'set_x2': 'x2', 'set_x3': 'x3', 'set_x4': 'x4'}
>>> ssdb.delete('set_abc')
True
>>> ssdb.hget("hash_1", 'a')
'A'
>>> ssdb.hexists('hash_2', 'key2')
True
>>> ssdb.hdecr('hash_2', 'key1', 7)
36
>>> ssdb.hsize('hash_1')
7
>>> ssdb.hlist('hash_ ', 'hash_z', 10)
['hash_1', 'hash_2']
>>> ssdb.hscan('hash_1', 'a', 'g', 10)
{'b': 'B', 'c': 'C', 'd': 'D', 'e': 'E', 'f': 'F', 'g': 'G'}
>>> ssdb.zget("zset_1", 'b')
20
>>> ssdb.zset("zset_1", 'z', 1024)
True
>>> ssdb.zset_exists('zset_2')
True
>>> ssdb.multi_zget('zset_1', 'a', 'b', 'c', 'd')
{'a': 30, 'c': 100, 'b': 20, 'd': 1}
>>> ssdb.zkeys('zset_1', '', 0, 200, 3)
['g', 'd', 'b']
>>> ssdb.zscan('zset_1', '', 0, 200, 10)
{'g': 0, 'd': 1, 'b': 20, 'a': 30, 'e': 64, 'c': 100}
>>> ssdb.zrscan('zset_1', 'a', 30, -1000, 3)
{'b': 20, 'd': 1, 'g': 0}
>>> ssdb.zrank('zset_1','d')
2
>>> ssdb.zrrange('zset_1', 0, 4)
{'c': 100, 'e': 64, 'a': 30, 'b': 20}

Content¶

Connection¶

class ssdb.connection.Connection(host='127.0.0.1', port=8888, socket_timeout=None, socket_connect_timeout=None, socket_keepalive=False, socket_keepalive_options=None, retry_on_timeout=False, encoding='utf-8', encoding_errors='strict', decode_responses=False, parser_class=<class 'ssdb.connection.PythonParser'>, socket_read_size=65536)¶

Manages TCP communication to and from a SSDB server

>>> from ssdb.connection import Connection
>>> conn = Connection(host='localhost', port=8888)

class ssdb.connection.ConnectionPool(connection_class=<class 'ssdb.connection.Connection'>, max_connections=None, **connection_kwargs)¶

Generic connection pool.

>>> from ssdb.client import SSDB
>>> client = SSDB(connection_pool=ConnectionPool())

If max_connections is set, then this objectraises ssdb.ConnectionError when the pool’s limit is reached. By default, TCP connections are created connection_class is specified. Any additionan keyword arguments are passed to the constructor of connection_class.

class ssdb.connection.BlockingConnectionPool(max_connections=50, timeout=20, connection_class=<class 'ssdb.connection.Connection'>, queue_class=<class Queue.LifoQueue>, **connection_kwargs)¶

Thread-safe blocking connection pool:

>>> from ssdb.client import SSDB
>>> client = SSDB(connection_pool=BlockingConnectionPool())

It performs the same function as default :py:class: ~ssdb.connection.ConnectionPool implementation, in that, it maintains a pool of reusable connections that can be shared by multiple ssdb clients (safely across threads if required).

The difference is that, in the event that a client tries to get a connection from the pool when all of connections are in use, rather than raising a :py:class: ~ssdb.exceptions.ConnectionError (as the default :py:class: ~ssdb.connection.ConnectionPool implementation does), it makes the client wait (“blocks”) for a specified number of seconds until a connection becomes available/].

Use max_connections to increase / decrease the pool size:

>>> pool = BlockingConnectionPool(max_connections=10)

Use timeout to tell it either how many seconds to wait for a connection to become available, or to block forever:

>>> #Block forever.
>>> pool = BlockingConnectionPool(timeout=None)

>>> #Raise a ``ConnectionError`` after five seconds if a connection is not
>>> #available
>>> pool = BlockingConnectionPool(timeout=5)

Client¶

class ssdb.client.SSDB(host='localhost', port=8888, socket_timeout=None, connection_pool=None, charset='utf-8', errors='strict', decode_responses=False)¶: Provides backwards compatibility with older versions of ssdb-py(1.6.6) that changed arguments to some commands to be more Pythonic, sane, or by accident.

class ssdb.client.StrictSSDB(host='localhost', port=8888, socket_timeout=None, connection_pool=None, charset='utf-8', errors='strict', decode_responses=False)¶

Implementation of the SSDB protocol.

This abstract class provides a Python interface to all SSDB commands and an implementation of the SSDB protocol.

Connection derives from this, implementing how the commands are sent and received to the SSDB server.

Key/Value¶

A container of (key, value) pairs in ssdb. A key name maps a string value.

>>> from ssdb.client import SSDB
>>> ssdb = SSDB()
>>> ssdb.multi_set(set_a='a', set_b='b', set_c='c', set_d='d')
>>> ssdb.multi_set(set_x1='x1', set_x2='x2', set_x3='x3', set_x4='x4')
>>> ssdb.multi_set(set_abc='abc', set_count=10)

get¶

StrictSSDB.get(name)¶

Return the value at key name, or None if the key doesn’t exist

Like Redis.GET

Parameters:	name (string) – the key name
Returns:	the value at key `name`, or `None` if the key doesn’t exist
Return type:	string

>>> ssdb.get("set_abc")
'abc'
>>> ssdb.get("set_a")
'a'
>>> ssdb.get("set_b")
'b'
>>> ssdb.get("not_exists_abc")
>>> 

getset¶

StrictSSDB.getset(name, value)¶

Set the value at key name to value if key doesn’t exist Return the value at key name atomically.

Like Redis.GETSET

Parameters:	name (string) – the key name value (string) – a string or an object can be converted to string
Returns:	`True` on success, `False` if not
Return type:	bool

>>> ssdb.getset("getset_a", 'abc')
None
>>> ssdb.getset("getset_a", 'def')
'abc'
>>> ssdb.getset("getset_a", 'ABC')
'def'
>>> ssdb.getset("getset_a", 123)
'ABC'

set¶

StrictSSDB.set(name, value)¶

Set the value at key name to value .

Like Redis.SET

Parameters:	name (string) – the key name value (string) – a string or an object can be converted to string
Returns:	`True` on success, `False` if not
Return type:	bool

>>> ssdb.set("set_cde", 'cde')
True
>>> ssdb.set("set_cde", 'test')
True        
>>> ssdb.set("hundred", 100)
True

add¶

The same is set.

setnx¶

StrictSSDB.setnx(name, value)¶

Set the value at key name to value if and only if the key doesn’t exist.

Like Redis.SETNX

Parameters:	name (string) – the key name value (string) – a string or an object can be converted to string
Returns:	`True` on success, `False` if not
Return type:	bool

>>> ssdb.setnx("setnx_test", 'abc')
True
>>> ssdb.setnx("setnx_test", 'cde')
False        

expire¶

StrictSSDB.expire(name, ttl)¶

Set an expire flag on key name for ttl seconds. ttl can be represented by an integer or a Python timedelta object.

Like Redis.EXPIRE

Note

Expire only expire the Key/Value .

Parameters:	name (string) – the key name ttl (int) – number of seconds to live
Returns:	`True` on success, or `False` if the key doesn’t exist or failure
Return type:	bool

>>> ssdb.expire('set_abc', 6)
True
>>> ssdb.expire('not_exist')
False

ttl¶

StrictSSDB.ttl(name)¶

Returns the number of seconds until the key name will expire.

Like Redis.TTL

Note

ttl can only be used to the Key/Value .

Parameters:	name (string) – the key name
Returns:	the number of seconds, or `-1` if the key doesn’t exist or have no ttl
Return type:	int

>>> ssdb.ttl('set_abc')
6
>>> ssdb.ttl('not_exist')
-1

setx¶

SSDB.setx(name, value, ttl)¶

Set the value of key name to value that expires in ttl seconds. ttl can be represented by an integer or a Python timedelta object.

Like Redis.SETEX

Parameters:	name (string) – the key name value (string) – a string or an object can be converted to string ttl (int) – positive int seconds or timedelta object
Returns:	`True` on success, `False` if not
Return type:	bool

>>> import time
>>> ssdb.set("test_ttl", 'ttl', 4)
True
>>> ssdb.get("test_ttl")
'ttl'
>>> time.sleep(4)
>>> ssdb.get("test_ttl")
>>> 

delete¶

StrictSSDB.delete(name)¶

Delete the key specified by name .

Like Redis.DELETE

Note

Delete can’t delete the Hash or Zsets, use hclear for Hash and zclear for Zsets

Parameters:	name (string) – the key name
Returns:	`True` on deleting successfully, or `False` if the key doesn’t exist or failure
Return type:	bool

>>> ssdb.delete('set_abc')
True
>>> ssdb.delete('set_a')
True        
>>> ssdb.delete('set_abc')
False
>>> ssdb.delete('not_exist')
False

remove¶

The same is delete.

exists¶

StrictSSDB.exists(name)¶

Return a boolean indicating whether key name exists.

Like Redis.EXISTS

Note

exists can’t indicate whether any Hash, Zsets or Queue exists, use hash_exists for Hash , zset_exists for Zsets and queue_exists for Queue .

Parameters:	name (string) – the key name
Returns:	`True` if the key exists, `False` if not
Return type:	bool

>>> ssdb.exists('set_abc')
True
>>> ssdb.exists('set_a')
True
>>> ssdb.exists('not_exist')
False        

incr¶

StrictSSDB.incr(name, amount=1)¶

Increase the value at key name by amount. If no key exists, the value will be initialized as amount .

Like Redis.INCR

Parameters:	name (string) – the key name amount (int) – increments
Returns:	the integer value at key `name`
Return type:	int

>>> ssdb.incr('set_count', 3)
13
>>> ssdb.incr('set_count', 1)
14
>>> ssdb.incr('set_count', -2)
12
>>> ssdb.incr('temp_count', 42)
42        

decr¶

StrictSSDB.decr(name, amount=1)¶

Decrease the value at key name by amount. If no key exists, the value will be initialized as 0 - amount .

Like Redis.DECR

Parameters:	name (string) – the key name amount (int) – decrements
Returns:	the integer value at key `name`
Return type:	int

>>> ssdb.decr('set_count', 3)
7
>>> ssdb.decr('set_count', 1)
6
>>> ssdb.decr('temp_count', 42)
-42                

getbit¶

StrictSSDB.getbit(name, offset)¶

Returns a boolean indicating the value of offset in name

Like Redis.GETBIT

Parameters:	name (string) – the key name offset (int) – the bit position val (bool) – the bit value
Returns:	the bit at the `offset` , `False` if key doesn’t exist or offset exceeds the string length.
Return type:	bool

>>> ssdb.set('bit_test', 1)
True
>>> ssdb.getbit('bit_test', 0)
True
>>> ssdb.getbit('bit_test', 1)
False

setbit¶

StrictSSDB.setbit(name, offset, val)¶

Flag the offset in name as value. Returns a boolean indicating the previous value of offset.

Like Redis.SETBIT

Parameters:	name (string) – the key name offset (int) – the bit position val (bool) – the bit value
Returns:	the previous bit (False or True) at the `offset`
Return type:	bool

>>> ssdb.set('bit_test', 1)
True
>>> ssdb.setbit('bit_test', 1, 1)
False
>>> ssdb.get('bit_test')
3
>>> ssdb.setbit('bit_test', 2, 1)
False
>>> ssdb.get('bit_test')
7        

countbit¶

StrictSSDB.countbit(name, start=None, size=None)¶

Returns the count of set bits in the value of key. Optional start and size paramaters indicate which bytes to consider.

Similiar with Redis.BITCOUNT

Parameters:	name (string) – the key name start (int) – Optional, if start is negative, count from start’th character from the end of string. size (int) – Optional, if size is negative, then that many characters will be omitted from the end of string.
Returns:	the count of the bit 1
Return type:	int

>>> ssdb.set('bit_test', 1)
True
>>> ssdb.countbit('bit_test')
3
>>> ssdb.set('bit_test','1234567890')
True
>>> ssdb.countbit('bit_test', 0, 1)
3
>>> ssdb.countbit('bit_test', 3, -3)
16

substr¶

StrictSSDB.substr(name, start=None, size=None)¶

Return a substring of the string at key name. start and size are 0-based integers specifying the portion of the string to return.

Like Redis.SUBSTR

Parameters:	name (string) – the key name start (int) – Optional, the offset of first byte returned. If start is negative, the returned string will start at the start’th character from the end of string. size (int) – Optional, number of bytes returned. If size is negative, then that many characters will be omitted from the end of string.
Returns:	The extracted part of the string.
Return type:	string

>>> ssdb.set('str_test', 'abc12345678')
True
>>> ssdb.substr('str_test', 2, 4)
'c123'
>>> ssdb.substr('str_test', -2, 2)
'78'
>>> ssdb.substr('str_test', 1, -1)
'bc1234567'

strlen¶

StrictSSDB.strlen(name)¶

Return the number of bytes stored in the value of name

Like Redis.STRLEN

Parameters:	name (string) – the key name
Returns:	The number of bytes of the string, if key not exists, returns 0.
Return type:	int

>>> ssdb.set('str_test', 'abc12345678')
True
>>> ssdb.strlen('str_test')
11

multi_set¶

StrictSSDB.multi_set(**kvs)¶

Set key/value based on a mapping dictionary as kwargs.

Like Redis.MSET

Parameters:	kvs (dict) – a key/value mapping dict
Returns:	the number of successful operation
Return type:	int

>>> ssdb.multi_set(set_a='a', set_b='b', set_c='c', set_d='d')
4
>>> ssdb.multi_set(set_abc='abc',set_count=10)
2

mset¶

The same is multi_set.

multi_get¶

StrictSSDB.multi_get(*names)¶

Return a dictionary mapping key/value by names

Like Redis.MGET

Parameters:	names (list) – a list of keys
Returns:	a dict mapping key/value
Return type:	dict

>>> ssdb.multi_get('a', 'b', 'c', 'd')
{'a': 'a', 'c': 'c', 'b': 'b', 'd': 'd'}
>>> ssdb.multi_get('set_abc','set_count')
{'set_abc': 'set_abc', 'set_count': '10'}

mget¶

The same is multi_get.

multi_del¶

StrictSSDB.multi_del(*names)¶

Delete one or more keys specified by names

Like Redis.DELETE

Parameters:	names (list) – a list of keys
Returns:	the number of successful deletion
Return type:	int

>>> ssdb.multi_del('a', 'b', 'c', 'd')
4
>>> ssdb.multi_del('set_abc','set_count')
2

mdel¶

The same is multi_del.

keys¶

StrictSSDB.keys(name_start, name_end, limit=10)¶

Return a list of the top limit keys between name_start and name_end

Similiar with Redis.KEYS

Note

The range is (name_start, name_end]. name_start isn’t in the range, but name_end is.

Parameters:	name_start (string) – The lower bound(not included) of keys to be returned, empty string `''` means -inf name_end (string) – The upper bound(included) of keys to be returned, empty string `''` means +inf limit (int) – number of elements will be returned.
Returns:	a list of keys
Return type:	list

>>> ssdb.keys('set_x1', 'set_x3', 10)
['set_x2', 'set_x3']
>>> ssdb.keys('set_x ', 'set_xx', 3)
['set_x1', 'set_x2', 'set_x3']
>>> ssdb.keys('set_x ', '', 3)
['set_x1', 'set_x2', 'set_x3', 'set_x4']
>>> ssdb.keys('set_zzzzz ', '', )
[]

scan¶

StrictSSDB.scan(name_start, name_end, limit=10)¶

Scan and return a dict mapping key/value in the top limit keys between name_start and name_end in ascending order

Similiar with Redis.SCAN

Note

The range is (name_start, name_end]. name_start isn’t in the range, but name_end is.

Parameters:	name_start (string) – The lower bound(not included) of keys to be returned, empty string `''` means -inf name_end (string) – The upper bound(included) of keys to be returned, empty string `''` means +inf limit (int) – number of elements will be returned.
Returns:	a dict mapping key/value in ascending order
Return type:	OrderedDict

>>> ssdb.scan('set_x1', 'set_x3', 10)
{'set_x2': 'x2', 'set_x3': 'x3'}
>>> ssdb.scan('set_x ', 'set_xx', 3)
{'set_x1': 'x1', 'set_x2': 'x2', 'set_x3': 'x3'}
>>> ssdb.scan('set_x ', '', 10)
{'set_x1': 'x1', 'set_x2': 'x2', 'set_x3': 'x3', 'set_x4': 'x4'}
>>> ssdb.scan('set_zzzzz ', '', 10)
{}

rscan¶

StrictSSDB.rscan(name_start, name_end, limit=10)¶

Scan and return a dict mapping key/value in the top limit keys between name_start and name_end in descending order

Note

The range is (name_start, name_end]. name_start isn’t in the range, but name_end is.

Parameters:	name_start (string) – The upper bound(not included) of keys to be returned, empty string `''` means +inf name_end (string) – The lower bound(included) of keys to be returned, empty string `''` means -inf limit (int) – number of elements will be returned.
Returns:	a dict mapping key/value in descending order
Return type:	OrderedDict

>>> ssdb.scan('set_x3', 'set_x1', 10)
{'set_x2': 'x2', 'set_x1': 'x1'}
>>> ssdb.scan('set_xx', 'set_x ', 3)
{'set_x4': 'x4', 'set_x3': 'x3', 'set_x2': 'x2'}
>>> ssdb.scan('', 'set_x ', 10)
{'set_x4': 'x4', 'set_x3': 'x3', 'set_x2': 'x2', 'set_x1': 'x1'}
>>> ssdb.scan('', 'set_zzzzz', 10)
{}

Hash¶

A container of (key, dict) pairs in ssdb. A hash name maps a dict which contains key/value pairs

>>> from ssdb.client import SSDB
>>> ssdb = SSDB()
>>> ssdb.multi_hset('hash_1', a='A', b='B', c='C', d='D', e='E', f='F',
...                 g='G')
>>> ssdb.multi_hset('hash_2',
...                 key1=42,
...                 key2=3.1415926,
...                 key3=-1.41421,
...                 key4=256,
...                 key5='e',
...                 key6='log'
...                )

hget¶

StrictSSDB.hget(name, key)¶

Get the value of key within the hash name

Like Redis.HGET

Parameters:	name (string) – the hash name key (string) – the key name
Returns:	the value at `key` within hash `name` , or `None` if the `name` or `key` doesn’t exist
Return type:	string

>>> ssdb.hget("hash_1", 'a')
'A'
>>> ssdb.hget("hash_1", 'b')
'B'
>>> ssdb.hget("hash_1", 'z')
>>>
>>> ssdb.hget("hash_2", 'key1')
'42'

hset¶

StrictSSDB.hset(name, key, value)¶

Set the value of key within the hash name to value

Like Redis.HSET

Parameters:	name (string) – the hash name key (string) – the key name value (string) – a string or an object can be converted to string
Returns:	`True` if `hset` created a new field, otherwise `False`
Return type:	bool

>>> ssdb.hset("hash_3", 'yellow', '#FFFF00')
True
>>> ssdb.hset("hash_3", 'red', '#FF0000')
True
>>> ssdb.hset("hash_3", 'blue', '#0000FF')
True
>>> ssdb.hset("hash_3", 'yellow', '#FFFF00')
False

hadd¶

The same is hadd.

hclear¶

StrictSSDB.hclear(name)¶

Clear&Delete the hash specified by name

Parameters:	name (string) – the hash name
Returns:	the length of removed elements
Return type:	int

>>> ssdb.hclear('hash_1')
7
>>> ssdb.hclear('hash_1')
0
>>> ssdb.hclear('hash_2')
6
>>> ssdb.hclear('not_exist')
0

hdel¶

StrictSSDB.hdel(name, key)¶

Remove the key from hash name

Like Redis.HDEL

Parameters:	name (string) – the hash name key (string) – the key name
Returns:	`True` if deleted successfully, otherwise `False`
Return type:	bool

>>> ssdb.hdel("hash_2", 'key1')
True
>>> ssdb.hdel("hash_2", 'key2')
True
>>> ssdb.hdel("hash_2", 'key3')
True
>>> ssdb.hdel("hash_2", 'key_not_exist')
False
>>> ssdb.hdel("hash_not_exist", 'key1')
False

hremove¶

The same is hdel.

hash_exists¶

StrictSSDB.hash_exists(name)¶

Return a boolean indicating whether hash name exists

Parameters:	name (string) – the hash name
Returns:	`True` if the hash exists, `False` if not
Return type:	string

>>> ssdb.hash_exists('hash_1')
True
>>> ssdb.hash_exists('hash_2')
True
>>> ssdb.hash_exists('hash_not_exist')
False        

hexists¶

StrictSSDB.hexists(name, key)¶

Return a boolean indicating whether key exists within hash name

Like Redis.HEXISTS

Parameters:	name (string) – the hash name key (string) – the key name
Returns:	`True` if the key exists, `False` if not
Return type:	bool

>>> ssdb.hexists('hash_1', 'a')
True
>>> ssdb.hexists('hash_2', 'key2')
True
>>> ssdb.hexists('hash_not_exist', 'a')
False
>>> ssdb.hexists('hash_1', 'z_not_exists')
False
>>> ssdb.hexists('hash_not_exist', 'key_not_exists')
False                        

hincr¶

StrictSSDB.hincr(name, key, amount=1)¶

Increase the value of key in hash name by amount. If no key exists, the value will be initialized as amount

Like Redis.HINCR

Parameters:	name (string) – the hash name key (string) – the key name amount (int) – increments
Returns:	the integer value of `key` in hash `name`
Return type:	int

>>> ssdb.hincr('hash_2', 'key1', 7)
49
>>> ssdb.hincr('hash_2', 'key2', 3)
6
>>> ssdb.hincr('hash_2', 'key_not_exists', 101)
101
>>> ssdb.hincr('hash_not_exists', 'key_not_exists', 8848)
8848

hdecr¶

StrictSSDB.hdecr(name, key, amount=1)¶

Decrease the value of key in hash name by amount. If no key exists, the value will be initialized as 0 - amount

Parameters:	name (string) – the hash name key (string) – the key name amount (int) – increments
Returns:	the integer value of `key` in hash `name`
Return type:	int

>>> ssdb.hdecr('hash_2', 'key1', 7)
35
>>> ssdb.hdecr('hash_2', 'key2', 3)
0
>>> ssdb.hdecr('hash_2', 'key_not_exists', 101)
-101
>>> ssdb.hdecr('hash_not_exists', 'key_not_exists', 8848)
-8848

hsize¶

StrictSSDB.hsize(name)¶

Return the number of elements in hash name

Like Redis.HLEN

Parameters:	name (string) – the hash name
Returns:	the size of hash name`
Return type:	int

>>> ssdb.hsize('hash_1')
7
>>> ssdb.hsize('hash_2')
6
>>> ssdb.hsize('hash_not_exists')
0

hlen¶

The same is hsize.

multi_hget¶

StrictSSDB.multi_hget(name, *keys)¶

Return a dictionary mapping key/value by keys from hash names

Like Redis.HMGET

Parameters:	name (string) – the hash name keys (list) – a list of keys
Returns:	a dict mapping key/value
Return type:	dict

>>> ssdb.multi_hget('hash_1', 'a', 'b', 'c', 'd')
{'a': 'A', 'c': 'C', 'b': 'B', 'd': 'D'}
>>> ssdb.multi_hget('hash_2', 'key2', 'key5')
{'key2': '3.1415926', 'key5': 'e'}

hmget¶

The same is multi_hget.

multi_hset¶

StrictSSDB.multi_hset(name, **kvs)¶

Set key to value within hash name for each corresponding key and value from the kvs dict.

Like Redis.HMSET

Parameters:	name (string) – the hash name keys (list) – a list of keys
Returns:	the number of successful creation
Return type:	int

>>> ssdb.multi_hset('hash_4', a='AA', b='BB', c='CC', d='DD')
4
>>> ssdb.multi_hset('hash_4', a='AA', b='BB', c='CC', d='DD')
0
>>> ssdb.multi_hset('hash_4', a='AA', b='BB', c='CC', d='DD', e='EE')
1        

hmset¶

The same is multi_hset.

multi_hdel¶

StrictSSDB.multi_hdel(name, *keys)¶

Remove keys from hash name

Like Redis.HMDEL

Parameters:	name (string) – the hash name keys (list) – a list of keys
Returns:	the number of successful deletion
Return type:	int

>>> ssdb.multi_hdel('hash_1', 'a', 'b', 'c', 'd')
4
>>> ssdb.multi_hdel('hash_1', 'a', 'b', 'c', 'd')
0        
>>> ssdb.multi_hdel('hash_2', 'key2_not_exist', 'key5_not_exist')
0

hmdel¶

The same is multi_hdel.

hlist¶

StrictSSDB.hlist(name_start, name_end, limit=10)¶

Return a list of the top limit hash’s name between name_start and name_end in ascending order

Note

The range is (name_start, name_end]. The name_start isn’t in the range, but name_end is.

Parameters:	name_start (string) – The lower bound(not included) of hash names to be returned, empty string `''` means -inf name_end (string) – The upper bound(included) of hash names to be returned, empty string `''` means +inf limit (int) – number of elements will be returned.
Returns:	a list of hash’s name
Return type:	list

>>> ssdb.hlist('hash_ ', 'hash_z', 10)
['hash_1', 'hash_2']
>>> ssdb.hlist('hash_ ', '', 3)
['hash_1', 'hash_2']
>>> ssdb.hlist('', 'aaa_not_exist', 10)
[]

hrlist¶

StrictSSDB.hrlist(name_start, name_end, limit=10)¶

Return a list of the top limit hash’s name between name_start and name_end in descending order

Note

The range is (name_start, name_end]. The name_start isn’t in the range, but name_end is.

Parameters:	name_start (string) – The lower bound(not included) of hash names to be returned, empty string `''` means +inf name_end (string) – The upper bound(included) of hash names to be returned, empty string `''` means -inf limit (int) – number of elements will be returned.
Returns:	a list of hash’s name
Return type:	list

>>> ssdb.hrlist('hash_ ', 'hash_z', 10)
['hash_2', 'hash_1']
>>> ssdb.hrlist('hash_ ', '', 3)
['hash_2', 'hash_1']
>>> ssdb.hrlist('', 'aaa_not_exist', 10)
[]

hkeys¶

StrictSSDB.hkeys(name, key_start, key_end, limit=10)¶

Return a list of the top limit keys between key_start and key_end in hash name

Similiar with Redis.HKEYS

Note

The range is (key_start, key_end]. The key_start isn’t in the range, but key_end is.

Parameters:	name (string) – the hash name key_start (string) – The lower bound(not included) of keys to be returned, empty string `''` means -inf key_end (string) – The upper bound(included) of keys to be returned, empty string `''` means +inf limit (int) – number of elements will be returned.
Returns:	a list of keys
Return type:	list

>>> ssdb.hkeys('hash_1', 'a', 'g', 10)
['b', 'c', 'd', 'e', 'f', 'g']
>>> ssdb.hkeys('hash_2', 'key ', 'key4', 3)
['key1', 'key2', 'key3']
>>> ssdb.hkeys('hash_1', 'f', '', 10)
['g']
>>> ssdb.hkeys('hash_2', 'keys', '', 10)
[]

hscan¶

StrictSSDB.hscan(name, key_start, key_end, limit=10)¶

Return a dict mapping key/value in the top limit keys between key_start and key_end within hash name in ascending order

Similiar with Redis.HSCAN

Note

The range is (key_start, key_end]. The key_start isn’t in the range, but key_end is.

Parameters:	name (string) – the hash name key_start (string) – The lower bound(not included) of keys to be returned, empty string `''` means -inf key_end (string) – The upper bound(included) of keys to be returned, empty string `''` means +inf limit (int) – number of elements will be returned.
Returns:	a dict mapping key/value in ascending order
Return type:	OrderedDict

>>> ssdb.hscan('hash_1', 'a', 'g', 10)
{'b': 'B', 'c': 'C', 'd': 'D', 'e': 'E', 'f': 'F', 'g': 'G'}
>>> ssdb.hscan('hash_2', 'key ', 'key4', 3)
{'key1': '42', 'key2': '3.1415926', 'key3': '-1.41421'}
>>> ssdb.hscan('hash_1', 'f', '', 10)
{'g': 'G'}
>>> ssdb.hscan('hash_2', 'keys', '', 10)
{}

hrscan¶

StrictSSDB.hrscan(name, key_start, key_end, limit=10)¶

Return a dict mapping key/value in the top limit keys between key_start and key_end within hash name in descending order

Note

The range is (key_start, key_end]. The key_start isn’t in the range, but key_end is.

Parameters:	name (string) – the hash name key_start (string) – The upper bound(not included) of keys to be returned, empty string `''` means +inf key_end (string) – The lower bound(included) of keys to be returned, empty string `''` means -inf limit (int) – number of elements will be returned.
Returns:	a dict mapping key/value in descending order
Return type:	OrderedDict

>>> ssdb.hrscan('hash_1', 'g', 'a', 10)
{'f': 'F', 'e': 'E', 'd': 'D', 'c': 'C', 'b': 'B', 'a': 'A'}
>>> ssdb.hrscan('hash_2', 'key7', 'key1', 3)
{'key6': 'log', 'key5': 'e', 'key4': '256'}
>>> ssdb.hrscan('hash_1', 'c', '', 10)
{'b': 'B', 'a': 'A'}
>>> ssdb.hscan('hash_2', 'keys', '', 10)
{}        

Zsets¶

A sorted set in ssdb. It’s contain keys with scores in zset

>>> from ssdb.client import SSDB
>>> ssdb = SSDB()
>>> ssdb.multi_zset('zset_1', a=30, b=20, c=100, d=1, e=64, f=-3,
...                 g=0)
>>> ssdb.multi_zset('zset_2',
...                 key1=42,
...                 key2=314,
...                 key3=1,
...                 key4=256,
...                 key5=0,
...                 key6=-5
...                )

zget¶

StrictSSDB.zget(name, key)¶

Return the score of element key in sorted set name

Like Redis.ZSCORE

Parameters:	name (string) – the zset name key (string) – the key name
Returns:	the score, `None` if the zset `name` or the `key` doesn’t exist
Return type:	int

>>> ssdb.zget("zset_1", 'a')
30
>>> ssdb.zget("zset_1", 'b')
20
>>> ssdb.zget("zset_1", 'z')
>>>
>>> ssdb.zget("zset_2", 'key1')
42

zset¶

StrictSSDB.zset(name, key, score=1)¶

Set the score of key from the zset name to score

Like Redis.ZADD

Parameters:	name (string) – the zset name key (string) – the key name score (int) – the score for ranking
Returns:	`True` if `zset` created a new score, otherwise `False`
Return type:	bool

>>> ssdb.zset("zset_1", 'z', 1024)
True
>>> ssdb.zset("zset_1", 'a', 1024)
False
>>> ssdb.zset("zset_2", 'key_10', -4)
>>>
>>> ssdb.zget("zset_2", 'key1')
42        

zadd¶

The same is zset.

zclear¶

StrictSSDB.zclear(name)¶

Clear&Delete the zset specified by name

Parameters:	name (string) – the zset name
Returns:	the length of removed elements
Return type:	int

>>> ssdb.zclear('zset_1')
7
>>> ssdb.zclear('zset_1')
0
>>> ssdb.zclear('zset_2')
6
>>> ssdb.zclear('not_exist')
0

zdel¶

StrictSSDB.zdel(name, key)¶

Remove the specified key from zset name

Like Redis.ZREM

Parameters:	name (string) – the zset name key (string) – the key name
Returns:	`True` if deleted success, otherwise `False`
Return type:	bool

>>> ssdb.zdel("zset_2", 'key1')
True
>>> ssdb.zdel("zset_2", 'key2')
True
>>> ssdb.zdel("zset_2", 'key3')
True
>>> ssdb.zdel("zset_2", 'key_not_exist')
False
>>> ssdb.zdel("zset_not_exist", 'key1')
False        

zremove¶

The same is zdel.

zset_exists¶

StrictSSDB.zset_exists(name)¶

Return a boolean indicating whether zset name exists

Parameters:	name (string) – the zset name
Returns:	`True` if the zset exists, `False` if not
Return type:	string

>>> ssdb.zset_exists('zset_1')
True
>>> ssdb.zset_exists('zset_2')
True
>>> ssdb.zset_exists('zset_not_exist')
False        

zexists¶

StrictSSDB.zexists(name, key)¶

Return a boolean indicating whether key exists within zset name

Parameters:	name (string) – the zset name key (string) – the key name
Returns:	`True` if the key exists, `False` if not
Return type:	bool

>>> ssdb.zexists('zset_1', 'a')
True
>>> ssdb.zexists('zset_2', 'key2')
True
>>> ssdb.zexists('zset_not_exist', 'a')
False
>>> ssdb.zexists('zset_1', 'z_not_exists')
False
>>> ssdb.zexists('zset_not_exist', 'key_not_exists')
False                        

zincr¶

StrictSSDB.zincr(name, key, amount=1)¶

Increase the score of key in zset name by amount. If no key exists, the value will be initialized as amount

Like Redis.ZINCR

Parameters:	name (string) – the zset name key (string) – the key name amount (int) – increments
Returns:	the integer value of `key` in zset `name`
Return type:	int

>>> ssdb.zincr('zset_2', 'key1', 7)
49
>>> ssdb.zincr('zset_2', 'key2', 3)
317
>>> ssdb.zincr('zset_2', 'key_not_exists', 101)
101
>>> ssdb.zincr('zset_not_exists', 'key_not_exists', 8848)
8848

zdecr¶

StrictSSDB.zdecr(name, key, amount=1)¶

Decrease the value of key in zset name by amount. If no key exists, the value will be initialized as 0 - amount

Parameters:	name (string) – the zset name key (string) – the key name amount (int) – increments
Returns:	the integer value of `key` in zset `name`
Return type:	int

>>> ssdb.zdecr('zset_2', 'key1', 7)
36
>>> ssdb.zdecr('zset_2', 'key2', 3)
311
>>> ssdb.zdecr('zset_2', 'key_not_exists', 101)
-101
>>> ssdb.zdecr('zset_not_exists', 'key_not_exists', 8848)
-8848

zsize¶

StrictSSDB.zsize(name)¶

Return the number of elements in zset name

Like Redis.ZCARD

Parameters:	name (string) – the zset name
Returns:	the size of zset name`
Return type:	int

>>> ssdb.zsize('zset_1')
7
>>> ssdb.zsize('zset_2')
6
>>> ssdb.zsize('zset_not_exists')
0

zlen¶

The same is zsize.

zcard¶

The same is zsize.

multi_zget¶

StrictSSDB.multi_zget(name, *keys)¶

Return a dictionary mapping key/value by keys from zset names

Parameters:	name (string) – the zset name keys (list) – a list of keys
Returns:	a dict mapping key/value
Return type:	dict

>>> ssdb.multi_zget('zset_1', 'a', 'b', 'c', 'd')
{'a': 30, 'c': 100, 'b': 20, 'd': 1}
>>> ssdb.multi_zget('zset_2', 'key2', 'key5')
{'key2': 314, 'key5': 0}

zmget¶

The same is multi_zget.

multi_zset¶

StrictSSDB.multi_zset(name, **kvs)¶

Return a dictionary mapping key/value by keys from zset names

Parameters:	name (string) – the zset name keys (list) – a list of keys
Returns:	the number of successful creation
Return type:	int

>>> ssdb.multi_zset('zset_4', a=100, b=80, c=90, d=70)
4
>>> ssdb.multi_zset('zset_4', a=100, b=80, c=90, d=70)
0
>>> ssdb.multi_zset('zset_4', a=100, b=80, c=90, d=70, e=60)
1        

zmget¶

The same is multi_zset.

multi_zdel¶

StrictSSDB.multi_zdel(name, *keys)¶

Remove keys from zset name

Parameters:	name (string) – the zset name keys (list) – a list of keys
Returns:	the number of successful deletion
Return type:	int

>>> ssdb.multi_zdel('zset_1', 'a', 'b', 'c', 'd')
4
>>> ssdb.multi_zdel('zset_1', 'a', 'b', 'c', 'd')
0        
>>> ssdb.multi_zdel('zset_2', 'key2_not_exist', 'key5_not_exist')
0

zmdel¶

The same is multi_zdel.

zlist¶

StrictSSDB.zlist(name_start, name_end, limit=10)¶

Return a list of the top limit zset’s name between name_start and name_end in ascending order

Note

The range is (name_start, name_end]. The name_start isn’t in the range, but name_end is.

Parameters:	name_start (string) – The lower bound(not included) of zset names to be returned, empty string `''` means -inf name_end (string) – The upper bound(included) of zset names to be returned, empty string `''` means +inf limit (int) – number of elements will be returned.
Returns:	a list of zset’s name
Return type:	list

>>> ssdb.zlist('zset_ ', 'zset_z', 10)
['zset_1', 'zset_2']
>>> ssdb.zlist('zset_ ', '', 3)
['zset_1', 'zset_2']
>>> ssdb.zlist('', 'aaa_not_exist', 10)
[]

zrlist¶

StrictSSDB.zrlist(name_start, name_end, limit=10)¶

Return a list of the top limit zset’s name between name_start and name_end in descending order

Note

The range is (name_start, name_end]. The name_start isn’t in the range, but name_end is.

Parameters:	name_start (string) – The lower bound(not included) of zset names to be returned, empty string `''` means +inf name_end (string) – The upper bound(included) of zset names to be returned, empty string `''` means -inf limit (int) – number of elements will be returned.
Returns:	a list of zset’s name
Return type:	list

>>> ssdb.zlist('zset_ ', 'zset_z', 10)
['zset_2', 'zset_1']
>>> ssdb.zlist('zset_ ', '', 3)
['zset_2', 'zset_1']
>>> ssdb.zlist('', 'aaa_not_exist', 10)
[]

zkeys¶

StrictSSDB.zkeys(name, key_start, score_start, score_end, limit=10)¶

Return a list of the top limit keys after key_start from zset name with scores between score_start and score_end

Note

The range is (key_start``+``score_start, key_end]. That means (key.score == score_start && key > key_start || key.score > score_start)

Parameters:	name (string) – the zset name key_start (string) – The lower bound(not included) of keys to be returned, empty string `''` means -inf key_end (string) – The upper bound(included) of keys to be returned, empty string `''` means +inf limit (int) – number of elements will be returned.
Returns:	a list of keys
Return type:	list

>>> ssdb.zkeys('zset_1', '', 0, 200, 10)
['g', 'd', 'b', 'a', 'e', 'c']
>>> ssdb.zkeys('zset_1', '', 0, 200, 3)
['g', 'd', 'b']
>>> ssdb.zkeys('zset_1', 'b', 20, 200, 3)
['a', 'e', 'c']
>>> ssdb.zkeys('zset_1', 'c', 100, 200, 3)
[]

zscan¶

StrictSSDB.zscan(name, key_start, score_start, score_end, limit=10)¶

Return a dict mapping key/score of the top limit keys after key_start with scores between score_start and score_end in zset name in ascending order

Similiar with Redis.ZSCAN

Note

The range is (key_start``+``score_start, key_end]. That means (key.score == score_start && key > key_start || key.score > score_start)

Parameters:	name (string) – the zset name key_start (string) – The key related to score_start, could be empty string `''` score_start (int) – The minimum score related to keys(may not be included, depend on key_start), empty string `''` means -inf score_end (int) – The maximum score(included) related to keys, empty string `''` means +inf limit (int) – number of elements will be returned.
Returns:	a dict mapping key/score in ascending order
Return type:	OrderedDict

>>> ssdb.zscan('zset_1', '', 0, 200, 10)
{'g': 0, 'd': 1, 'b': 20, 'a': 30, 'e': 64, 'c': 100}
>>> ssdb.zscan('zset_1', '', 0, 200, 3)
{'g': 0, 'd': 1, 'b': 20}
>>> ssdb.zscan('zset_1', 'b', 20, 200, 3)
{'a': 30, 'e': 64, 'c': 100}
>>> ssdb.zscan('zset_1', 'c', 100, 200, 3)
{}

zrscan¶

StrictSSDB.zrscan(name, key_start, score_start, score_end, limit=10)¶

Return a dict mapping key/score of the top limit keys after key_start with scores between score_start and score_end in zset name in descending order

Note

The range is (key_start``+``score_start, key_end]. That means (key.score == score_start && key < key_start || key.score < score_start)

Parameters:	name (string) – the zset name key_start (string) – The key related to score_start, could be empty string `''` score_start (int) – The maximum score related to keys(may not be included, depend on key_start), empty string `''` means +inf score_end (int) – The minimum score(included) related to keys, empty string `''` means -inf limit (int) – number of elements will be returned.
Returns:	a dict mapping key/score in descending order
Return type:	OrderedDict

>>> ssdb.zrscan('zset_1', '', '', '', 10)
{'c': 100, 'e': 64, 'a': 30, 'b': 20, 'd': 1, 'g': 0, 'f': -3}
>>> ssdb.zrscan('zset_1', '', 1000, -1000, 3)
{'c': 100, 'e': 64, 'a': 30}
>>> ssdb.zrscan('zset_1', 'a', 30, -1000, 3)
{'b': 20, 'd': 1, 'g': 0}
>>> ssdb.zrscan('zset_1', 'g', 0, -1000, 3)
{'g': 0}

zrank¶

StrictSSDB.zrank(name, key)¶

Returns a 0-based value indicating the rank of key in zset name

Like Redis.ZRANK

Warning

This method may be extremly SLOW! May not be used in an online service.

Parameters:	name (string) – the zset name key (string) – the key name
Returns:	the rank of `key` in zset `name`, -1 if the `key` or the `name` doesn’t exists
Return type:	int

>>> ssdb.zrank('zset_1','d')
2
>>> ssdb.zrank('zset_1','f')
0
>>> ssdb.zrank('zset_1','x')
-1

zrrank¶

StrictSSDB.zrrank(name, key)¶

Returns a 0-based value indicating the descending rank of key in zset

Warning

This method may be extremly SLOW! May not be used in an online service.

Parameters:	name (string) – the zset name key (string) – the key name
Returns:	the reverse rank of `key` in zset `name`, -1 if the `key` or the `name` doesn’t exists
Return type:	int

>>> ssdb.zrrank('zset_1','d')
4
>>> ssdb.zrrank('zset_1','f')
6
>>> ssdb.zrrank('zset_1','x')
-1

zrange¶

StrictSSDB.zrange(name, offset, limit)¶

Return a dict mapping key/score in a range of score from zset name between offset and offset+limit sorted in ascending order.

Like Redis.ZRANGE

Warning

This method is SLOW for large offset!

Parameters:	name (string) – the zset name offset (int) – zero or positive,the returned pairs will start at this offset limit (int) – number of elements will be returned
Returns:	a dict mapping key/score in ascending order
Return type:	OrderedDict

>>> ssdb.zrange('zset_1', 2, 3)
{'d': 1, 'b': 20, 'a': 30}
>>> ssdb.zrange('zset_1', 0, 2)
{'f': -3, 'g': 0}
>>> ssdb.zrange('zset_1', 10, 10)
{}

zrrange¶

StrictSSDB.zrrange(name, offset, limit)¶

Return a dict mapping key/score in a range of score from zset name between offset and offset+limit sorted in descending order.

Warning

This method is SLOW for large offset!

Parameters:	name (string) – the zset name offset (int) – zero or positive,the returned pairs will start at this offset limit (int) – number of elements will be returned
Returns:	a dict mapping key/score in ascending order
Return type:	OrderedDict

>>> ssdb.zrrange('zset_1', 0, 4)
{'c': 100, 'e': 64, 'a': 30, 'b': 20}
>>> ssdb.zrrange('zset_1', 4, 5)
{'d': 1, 'g': 0, 'f': -3}
>>> ssdb.zrrange('zset_1', 10, 10)
{}        

zcount¶

StrictSSDB.zcount(name, score_start, score_end)¶

Returns the number of elements in the sorted set at key name with a score between score_start and score_end.

Like Redis.ZCOUNT

Note

The range is [score_start, score_end]

Parameters:	name (string) – the zset name score_start (int) – The minimum score related to keys(included), empty string `''` means -inf score_end (int) – The maximum score(included) related to keys, empty string `''` means +inf
Returns:	the number of keys in specified range
Return type:	int

>>> ssdb.zount('zset_1', 20, 70)
3
>>> ssdb.zcount('zset_1', 0, 100)
6
>>> ssdb.zcount('zset_1', 2, 3)
0

zsum¶

StrictSSDB.zsum(name, score_start, score_end)¶

Returns the sum of elements of the sorted set stored at the specified key which have scores in the range [score_start,score_end].

Note

The range is [score_start, score_end]

Parameters:	name (string) – the zset name score_start (int) – The minimum score related to keys(included), empty string `''` means -inf score_end (int) – The maximum score(included) related to keys, empty string `''` means +inf
Returns:	the sum of keys in specified range
Return type:	int

>>> ssdb.zsum('zset_1', 20, 70)
114
>>> ssdb.zsum('zset_1', 0, 100)
215
>>> ssdb.zsum('zset_1', 2, 3)
0

zavg¶

StrictSSDB.zavg(name, score_start, score_end)¶

Returns the average of elements of the sorted set stored at the specified key which have scores in the range [score_start,score_end].

Note

The range is [score_start, score_end]

Parameters:	name (string) – the zset name score_start (int) – The minimum score related to keys(included), empty string `''` means -inf score_end (int) – The maximum score(included) related to keys, empty string `''` means +inf
Returns:	the average of keys in specified range
Return type:	int

>>> ssdb.zavg('zset_1', 20, 70)
38
>>> ssdb.zavg('zset_1', 0, 100)
35
>>> ssdb.zavg('zset_1', 2, 3)
0

zremrangebyrank¶

StrictSSDB.zremrangebyrank(name, rank_start, rank_end)¶

Remove the elements of the zset which have rank in the range [rank_start,rank_end].

Note

The range is [rank_start, rank_end]

Parameters:	name (string) – the zset name rank_start (int) – zero or positive,the start position rank_end (int) – zero or positive,the end position
Returns:	the number of deleted elements
Return type:	int

>>> ssdb.zremrangebyrank('zset_1', 0, 2)
3
>>> ssdb.zremrangebyrank('zset_1', 1, 4)
5
>>> ssdb.zremrangebyrank('zset_1', 0, 0)
1

zremrangebyscore¶

StrictSSDB.zremrangebyscore(name, score_start, score_end)¶

Delete the elements of the zset which have rank in the range [score_start,score_end].

Note

The range is [score_start, score_end]

Parameters:	name (string) – the zset name score_start (int) – The minimum score related to keys(included), empty string `''` means -inf score_end (int) – The maximum score(included) related to keys, empty string `''` means +inf
Returns:	the number of deleted elements
Return type:	int

>>> ssdb.zremrangebyscore('zset_1', 20, 70)
3
>>> ssdb.zremrangebyscore('zset_1', 0, 100)
6
>>> ssdb.zremrangebyscore('zset_1', 2, 3)
0        

Queue¶

A queue in ssdb.

>>> from ssdb.client import SSDB
>>> ssdb = SSDB()
>>> ssdb.qpush('queue_1', 'a', 'b', 'c', 'd', 'e', 'f', 'g')
>>> ssdb.qpush('queue_2',
...            'test1',
...            'test2',
...            'test3',
...            'test4',
...            'test5',
...            'test6',
...            )

qsize¶

StrictSSDB.qsize(name)¶

Return the length of the list name . If name does not exist, it is interpreted as an empty list and 0 is returned.

Like Redis.LLEN

Parameters:	name (string) – the queue name
Returns:	the queue length or 0 if the queue doesn’t exist.
Return type:	int

>>> ssdb.qsize('queue_1')
7
>>> ssdb.qsize('queue_2')
6
>>> ssdb.qsize('queue_not_exists')
0        

qlist¶

StrictSSDB.qlist(name_start, name_end, limit)¶

Return a list of the top limit keys between name_start and name_end in ascending order

Note

The range is (name_start, name_end]. name_start isn’t in the range, but name_end is.

Parameters:	name_start (string) – The lower bound(not included) of keys to be returned, empty string `''` means -inf name_end (string) – The upper bound(included) of keys to be returned, empty string `''` means +inf limit (int) – number of elements will be returned.
Returns:	a list of keys
Return type:	list

>>> ssdb.qlist('queue_1', 'queue_2', 10)
['queue_2']
>>> ssdb.qlist('queue_', 'queue_2', 10)
['queue_1', 'queue_2']
>>> ssdb.qlist('z', '', 10)
[]        

qrlist¶

StrictSSDB.qrlist(name_start, name_end, limit)¶

Return a list of the top limit keys between name_start and name_end in descending order

Note

The range is (name_start, name_end]. name_start isn’t in the range, but name_end is.

Parameters:	name_start (string) – The lower bound(not included) of keys to be returned, empty string `''` means +inf name_end (string) – The upper bound(included) of keys to be returned, empty string `''` means -inf limit (int) – number of elements will be returned.
Returns:	a list of keys
Return type:	list

>>> ssdb.qrlist('queue_2', 'queue_1', 10)
['queue_1']
>>> ssdb.qrlist('queue_z', 'queue_', 10)
['queue_2', 'queue_1']
>>> ssdb.qrlist('z', '', 10)
['queue_2', 'queue_1']

qclear¶

StrictSSDB.qclear(name)¶

Clear&Delete the queue specified by name

Parameters:	name (string) – the queue name
Returns:	the length of removed elements
Return type:	int

qfront¶

StrictSSDB.qfront(name)¶

Returns the first element of a queue.

Parameters:	name (string) – the queue name
Returns:	`None` if queue empty, otherwise the item returned
Return type:	string

qback¶

StrictSSDB.qback(name)¶

Returns the last element of a queue.

Parameters:	name (string) – the queue name
Returns:	`None` if queue empty, otherwise the item returned
Return type:	string

qget¶

StrictSSDB.qget(name, index)¶

Get the element of index within the queue name

Parameters:	name (string) – the queue name index (int) – the specified index, can < 0
Returns:	the value at `index` within queue `name` , or `None` if the element doesn’t exist
Return type:	string

qrange¶

StrictSSDB.qrange(name, offset, limit)¶

Return a limit slice of the list name at position offset

offset can be negative numbers just like Python slicing notation

Similiar with Redis.LRANGE

Parameters:	name (string) – the queue name offset (int) – the returned list will start at this offset limit (int) – number of elements will be returned
Returns:	a list of elements
Return type:	list

qslice¶

StrictSSDB.qslice(name, start, end)¶

Return a slice of the list name between position start and end

start and end can be negative numbers just like Python slicing notation

Like Redis.LRANGE

Parameters:	name (string) – the queue name start (int) – the returned list will start at this offset end (int) – the returned list will end at this offset
Returns:	a list of elements
Return type:	list

qpush_front¶

StrictSSDB.qpush_front(name, *items)¶

Push items onto the head of the list name

Like Redis.LPUSH

Parameters:	name (string) – the queue name index (int) – the specified index value (string) – the element value
Returns:	length of queue
Return type:	int

qpush_back¶

StrictSSDB.qpush_back(name, *items)¶

Push items onto the tail of the list name

Like Redis.RPUSH

Parameters:	name (string) – the queue name items (list) – the list of items
Returns:	length of queue
Return type:	int

qpush¶

StrictSSDB.qpush(name, *items)¶

Push items onto the tail of the list name

Like Redis.RPUSH

Parameters:	name (string) – the queue name items (list) – the list of items
Returns:	length of queue
Return type:	int

qpop_front¶

StrictSSDB.qpop_front(name, size=1)¶

Remove and return the first size item of the list name

Like Redis.LPOP

Parameters:	name (string) – the queue name size (int) – the length of result
Returns:	the list of pop elements
Return type:	list

qpop¶

StrictSSDB.qpop(name, size=1)¶

Remove and return the first size item of the list name

Like Redis.LPOP

Parameters:	name (string) – the queue name size (int) – the length of result
Returns:	the list of pop elements
Return type:	list

qpop_back¶

StrictSSDB.qpop_back(name, size=1)¶

Remove and return the last size item of the list name

Like Redis.RPOP

Parameters:	name (string) – the queue name size (int) – the length of result
Returns:	the list of pop elements
Return type:	list

queue_exists¶

StrictSSDB.queue_exists(name)¶

Return a boolean indicating whether queue name exists

Parameters:	name (string) – the queue name
Returns:	`True` if the queue exists, `False` if not
Return type:	string

>>> ssdb.queue_exists('queue_1')
True
>>> ssdb.queue_exists('queue_2')
True
>>> ssdb.queue_exists('queue_not_exist')
False        