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
, orNone
if the key doesn’t existLike Redis.GET
Parameters: name (string) – the key name Returns: the value at key name
, orNone
if the key doesn’t existReturn 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
tovalue
if key doesn’t exist Return the value at keyname
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 notReturn 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
tovalue
.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 notReturn type: bool
>>> ssdb.set("set_cde", 'cde') True >>> ssdb.set("set_cde", 'test') True >>> ssdb.set("hundred", 100) True
setnx¶
-
StrictSSDB.
setnx
(name, value)¶ Set the value at key
name
tovalue
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 notReturn 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
forttl
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, orFalse
if the key doesn’t exist or failureReturn 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 ttlReturn type: int >>> ssdb.ttl('set_abc') 6 >>> ssdb.ttl('not_exist') -1
setx¶
-
SSDB.
setx
(name, value, ttl)¶ Set the value of key
name
tovalue
that expires inttl
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 notReturn 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
Parameters: name (string) – the key name Returns: True
on deleting successfully, orFalse
if the key doesn’t exist or failureReturn type: bool >>> ssdb.delete('set_abc') True >>> ssdb.delete('set_a') True >>> ssdb.delete('set_abc') False >>> ssdb.delete('not_exist') False
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 notReturn 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
byamount
. If no key exists, the value will be initialized asamount
.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
byamount
. 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
inname
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
inname
asvalue
. Returns a boolean indicating the previous value ofoffset
.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
. Optionalstart
andsize
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
andsize
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
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'}
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
keys¶
-
StrictSSDB.
keys
(name_start, name_end, limit=10)¶ Return a list of the top
limit
keys betweenname_start
andname_end
Similiar with Redis.KEYS
Note
The range is (
name_start
,name_end
].name_start
isn’t in the range, butname_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 ', '', ) []
- name_start (string) – The lower bound(not included) of keys to be
returned, empty string
scan¶
-
StrictSSDB.
scan
(name_start, name_end, limit=10)¶ Scan and return a dict mapping key/value in the top
limit
keys betweenname_start
andname_end
in ascending orderSimiliar with Redis.SCAN
Note
The range is (
name_start
,name_end
].name_start
isn’t in the range, butname_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) {}
- name_start (string) – The lower bound(not included) of keys to be
returned, empty string
rscan¶
-
StrictSSDB.
rscan
(name_start, name_end, limit=10)¶ Scan and return a dict mapping key/value in the top
limit
keys betweenname_start
andname_end
in descending orderNote
The range is (
name_start
,name_end
].name_start
isn’t in the range, butname_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) {}
- name_start (string) – The upper bound(not included) of keys to be
returned, empty string
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 hashname
Like Redis.HGET
Parameters: - name (string) – the hash name
- key (string) – the key name
Returns: the value at
key
within hashname
, orNone
if thename
orkey
doesn’t existReturn 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 hashname
tovalue
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
ifhset
created a new field, otherwiseFalse
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
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 hashname
Like Redis.HDEL
Parameters: - name (string) – the hash name
- key (string) – the key name
Returns: True
if deleted successfully, otherwiseFalse
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
hash_exists¶
-
StrictSSDB.
hash_exists
(name)¶ Return a boolean indicating whether hash
name
existsParameters: name (string) – the hash name Returns: True
if the hash exists,False
if notReturn 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 hashname
Like Redis.HEXISTS
Parameters: - name (string) – the hash name
- key (string) – the key name
Returns: True
if the key exists,False
if notReturn 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 hashname
byamount
. If no key exists, the value will be initialized asamount
Like Redis.HINCR
Parameters: - name (string) – the hash name
- key (string) – the key name
- amount (int) – increments
Returns: the integer value of
key
in hashname
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 hashname
byamount
. 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 hashname
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
multi_hget¶
-
StrictSSDB.
multi_hget
(name, *keys)¶ Return a dictionary mapping key/value by
keys
from hashnames
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 thekvs
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 hashname
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 betweenname_start
andname_end
in ascending orderNote
The range is (
name_start
,name_end
]. Thename_start
isn’t in the range, butname_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) []
- name_start (string) – The lower bound(not included) of hash names to
be returned, empty string
hrlist¶
-
StrictSSDB.
hrlist
(name_start, name_end, limit=10)¶ Return a list of the top
limit
hash’s name betweenname_start
andname_end
in descending orderNote
The range is (
name_start
,name_end
]. Thename_start
isn’t in the range, butname_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) []
- name_start (string) – The lower bound(not included) of hash names to
be returned, empty string
hkeys¶
-
StrictSSDB.
hkeys
(name, key_start, key_end, limit=10)¶ Return a list of the top
limit
keys betweenkey_start
andkey_end
in hashname
Similiar with Redis.HKEYS
Note
The range is (
key_start
,key_end
]. Thekey_start
isn’t in the range, butkey_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 betweenkey_start
andkey_end
within hashname
in ascending orderSimiliar with Redis.HSCAN
Note
The range is (
key_start
,key_end
]. Thekey_start
isn’t in the range, butkey_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 betweenkey_start
andkey_end
within hashname
in descending orderNote
The range is (
key_start
,key_end
]. Thekey_start
isn’t in the range, butkey_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 setname
Like Redis.ZSCORE
Parameters: - name (string) – the zset name
- key (string) – the key name
Returns: the score,
None
if the zsetname
or thekey
doesn’t existReturn 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 zsetname
toscore
Like Redis.ZADD
Parameters: - name (string) – the zset name
- key (string) – the key name
- score (int) – the score for ranking
Returns: True
ifzset
created a new score, otherwiseFalse
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
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 zsetname
Like Redis.ZREM
Parameters: - name (string) – the zset name
- key (string) – the key name
Returns: True
if deleted success, otherwiseFalse
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
zset_exists¶
-
StrictSSDB.
zset_exists
(name)¶ Return a boolean indicating whether zset
name
existsParameters: name (string) – the zset name Returns: True
if the zset exists,False
if notReturn 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 zsetname
Parameters: - name (string) – the zset name
- key (string) – the key name
Returns: True
if the key exists,False
if notReturn 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 zsetname
byamount
. If no key exists, the value will be initialized asamount
Like Redis.ZINCR
Parameters: - name (string) – the zset name
- key (string) – the key name
- amount (int) – increments
Returns: the integer value of
key
in zsetname
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 zsetname
byamount
. 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 zsetname
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
multi_zget¶
-
StrictSSDB.
multi_zget
(name, *keys)¶ Return a dictionary mapping key/value by
keys
from zsetnames
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 zsetnames
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 zsetname
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 betweenname_start
andname_end
in ascending orderNote
The range is (
name_start
,name_end
]. Thename_start
isn’t in the range, butname_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) []
- name_start (string) – The lower bound(not included) of zset names to
be returned, empty string
zrlist¶
-
StrictSSDB.
zrlist
(name_start, name_end, limit=10)¶ Return a list of the top
limit
zset’s name betweenname_start
andname_end
in descending orderNote
The range is (
name_start
,name_end
]. Thename_start
isn’t in the range, butname_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) []
- name_start (string) – The lower bound(not included) of zset names to
be returned, empty string
zkeys¶
-
StrictSSDB.
zkeys
(name, key_start, score_start, score_end, limit=10)¶ Return a list of the top
limit
keys afterkey_start
from zsetname
with scores betweenscore_start
andscore_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 afterkey_start
with scores betweenscore_start
andscore_end
in zsetname
in ascending orderSimiliar 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 afterkey_start
with scores betweenscore_start
andscore_end
in zsetname
in descending orderNote
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 zsetname
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 zsetname
, -1 if thekey
or thename
doesn’t existsReturn 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 zsetWarning
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 zsetname
, -1 if thekey
or thename
doesn’t existsReturn 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
betweenoffset
andoffset+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
betweenoffset
andoffset+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 betweenscore_start
andscore_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 betweenname_start
andname_end
in ascending orderNote
The range is (
name_start
,name_end
].name_start
isn’t in the range, butname_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) []
- name_start (string) – The lower bound(not included) of keys to be
returned, empty string
qrlist¶
-
StrictSSDB.
qrlist
(name_start, name_end, limit)¶ Return a list of the top
limit
keys betweenname_start
andname_end
in descending orderNote
The range is (
name_start
,name_end
].name_start
isn’t in the range, butname_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']
- name_start (string) – The lower bound(not included) of keys to be
returned, empty string
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 returnedReturn 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 returnedReturn type: string
qget¶
-
StrictSSDB.
qget
(name, index)¶ Get the element of
index
within the queuename
Parameters: - name (string) – the queue name
- index (int) – the specified index, can < 0
Returns: the value at
index
within queuename
, orNone
if the element doesn’t existReturn type: string
qrange¶
-
StrictSSDB.
qrange
(name, offset, limit)¶ Return a
limit
slice of the listname
at positionoffset
offset
can be negative numbers just like Python slicing notationSimiliar 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 positionstart
andend
start
andend
can be negative numbers just like Python slicing notationLike 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 listname
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 listname
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 listname
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 listname
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 listname
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 listname
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
existsParameters: name (string) – the queue name Returns: True
if the queue exists,False
if notReturn type: string >>> ssdb.queue_exists('queue_1') True >>> ssdb.queue_exists('queue_2') True >>> ssdb.queue_exists('queue_not_exist') False