How to append a dictionary in a Redis cache?
I want to append dictionary in a Redis cache.
I haven't any problem with adding a dictionary in Redis but I couldn't append several dictionaries into Redis.
Here's an example:
import redis
cli = redis.Redis('localhost')
list_of_dict = [ # dummy
{
'tags': {'module': 'destructor', 'station': 'SNMP'},
'metric_name': 'destructor',
'value': -8555,
'time': '2018-11-13T15:25:07'
},
{
'tags': {'module': 'voltage', 'station': 'SNMP'},
'metric_name': 'voltage',
'value': 222,
'time': '2018-11-13T15:25:09'
}
]
from pprint import pprint
for ld in list_of_dict:
cli.hmset("pythonDict", ld)
# conn.append(key, val) # Need to key value.
pprint(cli.hgetall("pythonDict"))
In the above snippet code .hmset() writes only the last element/dict of list_of_dict in Redis (override) and .append() need to the key,val.
How can I write/append the two dictionaries of list_of_dict on Redis and retrieve it?
python redis
asked Nov 13 '18 at 13:58
Benyamin Jafari
2,77732036
add a comment |
I want to append dictionary in a Redis cache.
I haven't any problem with adding a dictionary in Redis but I couldn't append several dictionaries into Redis.
Here's an example:
import redis
cli = redis.Redis('localhost')
list_of_dict = [ # dummy
{
'tags': {'module': 'destructor', 'station': 'SNMP'},
'metric_name': 'destructor',
'value': -8555,
'time': '2018-11-13T15:25:07'
},
{
'tags': {'module': 'voltage', 'station': 'SNMP'},
'metric_name': 'voltage',
'value': 222,
'time': '2018-11-13T15:25:09'
}
]
from pprint import pprint
for ld in list_of_dict:
cli.hmset("pythonDict", ld)
# conn.append(key, val) # Need to key value.
pprint(cli.hgetall("pythonDict"))
In the above snippet code .hmset() writes only the last element/dict of list_of_dict in Redis (override) and .append() need to the key,val.
How can I write/append the two dictionaries of list_of_dict on Redis and retrieve it?
python redis
asked Nov 13 '18 at 13:58
Benyamin Jafari
2,77732036
add a comment |
I want to append dictionary in a Redis cache.
I haven't any problem with adding a dictionary in Redis but I couldn't append several dictionaries into Redis.
Here's an example:
import redis
cli = redis.Redis('localhost')
list_of_dict = [ # dummy
{
'tags': {'module': 'destructor', 'station': 'SNMP'},
'metric_name': 'destructor',
'value': -8555,
'time': '2018-11-13T15:25:07'
},
{
'tags': {'module': 'voltage', 'station': 'SNMP'},
'metric_name': 'voltage',
'value': 222,
'time': '2018-11-13T15:25:09'
}
]
from pprint import pprint
for ld in list_of_dict:
cli.hmset("pythonDict", ld)
# conn.append(key, val) # Need to key value.
pprint(cli.hgetall("pythonDict"))
In the above snippet code .hmset() writes only the last element/dict of list_of_dict in Redis (override) and .append() need to the key,val.
How can I write/append the two dictionaries of list_of_dict on Redis and retrieve it?
python redis
asked Nov 13 '18 at 13:58
Benyamin Jafari
2,77732036
I want to append dictionary in a Redis cache.
I haven't any problem with adding a dictionary in Redis but I couldn't append several dictionaries into Redis.
Here's an example:
import redis
cli = redis.Redis('localhost')
list_of_dict = [ # dummy
{
'tags': {'module': 'destructor', 'station': 'SNMP'},
'metric_name': 'destructor',
'value': -8555,
'time': '2018-11-13T15:25:07'
},
{
'tags': {'module': 'voltage', 'station': 'SNMP'},
'metric_name': 'voltage',
'value': 222,
'time': '2018-11-13T15:25:09'
}
]
from pprint import pprint
for ld in list_of_dict:
cli.hmset("pythonDict", ld)
# conn.append(key, val) # Need to key value.
pprint(cli.hgetall("pythonDict"))
In the above snippet code .hmset() writes only the last element/dict of list_of_dict in Redis (override) and .append() need to the key,val.
How can I write/append the two dictionaries of list_of_dict on Redis and retrieve it?
python redis
python redis
asked Nov 13 '18 at 13:58
Benyamin Jafari
2,77732036
asked Nov 13 '18 at 13:58
Benyamin Jafari
2,77732036
edited Nov 14 '18 at 5:58
asked Nov 13 '18 at 13:58
Benyamin Jafari
2,77732036
asked Nov 13 '18 at 13:58
Benyamin Jafari
2,77732036
asked Nov 13 '18 at 13:58
Benyamin Jafari
2,77732036
2,77732036
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
Set the key and value separately. Write the code in the following way:
for key,val in list_of_dict:
cli.hset("pythonDict", key, val)
pprint(cli.hgetall("pythonDict"))
If you want to store the array as it is and retrieve the value use json package. Below is a sample:
import json
cli.set("pythonDict", json.dumps(list_of_dict))
pprint(json.loads(cli.get("pythonDict")))
answered Nov 13 '18 at 14:08
Subhrajyoti Das
9461023
I don't want to replace same named keys
– Benyamin Jafari
Nov 13 '18 at 14:11
Writing values to one key will always overwrite the value. Do you want the whole array to be saved?
– Subhrajyoti Das
Nov 13 '18 at 15:13
I have updated the answer to show you how to save an array
– Subhrajyoti Das
Nov 13 '18 at 15:29
add a comment |
The approach you are using might turn suboptimal, as you are retrieving full data, appending to it, and saving it.
Since your requirement is iteratively appending to an existing list, it is better you use a Redis LIST.
The storage and retrieval approach would be:
Each element of your list would be a string ( which in turn is the
JSON representation of your single dictionary element)Whenever you want to append a dictionary to your existing cache, you
use an LPUSH command on python's redis client. That would
append your new dictionaries to existing Redis list.For data retrieval, you would use LRANGE to retrieve your full
or partial list of dictionaries.LRANGEhas equivalent performance
toHGETALL.
Example with redis client (the same set of commands can be used in the python redis client) :
edited Nov 14 '18 at 8:52
Benyamin Jafari
2,77732036
answered Nov 14 '18 at 6:53
DhruvPathak
28.6k980136
Thanks for the answer, but I encountered with this error:ResponseError: wrong number of arguments for 'lpush' command.
– Benyamin Jafari
Nov 14 '18 at 8:38
problem solved, I had a mistake in.lpush()argument, I forgaot thenamearg.
– Benyamin Jafari
Nov 14 '18 at 8:48
What is0,-1meaning in.lrange(name='pythonDict', start=0, end=-1)?
– Benyamin Jafari
Nov 14 '18 at 8:59
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53282674%2fhow-to-append-a-dictionary-in-a-redis-cache%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Set the key and value separately. Write the code in the following way:
for key,val in list_of_dict:
cli.hset("pythonDict", key, val)
pprint(cli.hgetall("pythonDict"))
If you want to store the array as it is and retrieve the value use json package. Below is a sample:
import json
cli.set("pythonDict", json.dumps(list_of_dict))
pprint(json.loads(cli.get("pythonDict")))
answered Nov 13 '18 at 14:08
Subhrajyoti Das
9461023
I don't want to replace same named keys
– Benyamin Jafari
Nov 13 '18 at 14:11
Writing values to one key will always overwrite the value. Do you want the whole array to be saved?
– Subhrajyoti Das
Nov 13 '18 at 15:13
I have updated the answer to show you how to save an array
– Subhrajyoti Das
Nov 13 '18 at 15:29
add a comment |
Set the key and value separately. Write the code in the following way:
for key,val in list_of_dict:
cli.hset("pythonDict", key, val)
pprint(cli.hgetall("pythonDict"))
If you want to store the array as it is and retrieve the value use json package. Below is a sample:
import json
cli.set("pythonDict", json.dumps(list_of_dict))
pprint(json.loads(cli.get("pythonDict")))
answered Nov 13 '18 at 14:08
Subhrajyoti Das
9461023
I don't want to replace same named keys
– Benyamin Jafari
Nov 13 '18 at 14:11
Writing values to one key will always overwrite the value. Do you want the whole array to be saved?
– Subhrajyoti Das
Nov 13 '18 at 15:13
I have updated the answer to show you how to save an array
– Subhrajyoti Das
Nov 13 '18 at 15:29
add a comment |
Set the key and value separately. Write the code in the following way:
for key,val in list_of_dict:
cli.hset("pythonDict", key, val)
pprint(cli.hgetall("pythonDict"))
If you want to store the array as it is and retrieve the value use json package. Below is a sample:
import json
cli.set("pythonDict", json.dumps(list_of_dict))
pprint(json.loads(cli.get("pythonDict")))
answered Nov 13 '18 at 14:08
Subhrajyoti Das
9461023
Set the key and value separately. Write the code in the following way:
for key,val in list_of_dict:
cli.hset("pythonDict", key, val)
pprint(cli.hgetall("pythonDict"))
If you want to store the array as it is and retrieve the value use json package. Below is a sample:
import json
cli.set("pythonDict", json.dumps(list_of_dict))
pprint(json.loads(cli.get("pythonDict")))
answered Nov 13 '18 at 14:08
Subhrajyoti Das
9461023
edited Nov 13 '18 at 15:28
answered Nov 13 '18 at 14:08
Subhrajyoti Das
9461023
answered Nov 13 '18 at 14:08
Subhrajyoti Das
9461023
answered Nov 13 '18 at 14:08
Subhrajyoti Das
9461023
9461023
I don't want to replace same named keys
– Benyamin Jafari
Nov 13 '18 at 14:11
Writing values to one key will always overwrite the value. Do you want the whole array to be saved?
– Subhrajyoti Das
Nov 13 '18 at 15:13
I have updated the answer to show you how to save an array
– Subhrajyoti Das
Nov 13 '18 at 15:29
add a comment |
I don't want to replace same named keys
– Benyamin Jafari
Nov 13 '18 at 14:11
Writing values to one key will always overwrite the value. Do you want the whole array to be saved?
– Subhrajyoti Das
Nov 13 '18 at 15:13
I have updated the answer to show you how to save an array
– Subhrajyoti Das
Nov 13 '18 at 15:29
I don't want to replace same named keys
– Benyamin Jafari
Nov 13 '18 at 14:11
I don't want to replace same named keys
– Benyamin Jafari
Nov 13 '18 at 14:11
Writing values to one key will always overwrite the value. Do you want the whole array to be saved?
– Subhrajyoti Das
Nov 13 '18 at 15:13
Writing values to one key will always overwrite the value. Do you want the whole array to be saved?
– Subhrajyoti Das
Nov 13 '18 at 15:13
I have updated the answer to show you how to save an array
– Subhrajyoti Das
Nov 13 '18 at 15:29
I have updated the answer to show you how to save an array
– Subhrajyoti Das
Nov 13 '18 at 15:29
add a comment |
The approach you are using might turn suboptimal, as you are retrieving full data, appending to it, and saving it.
Since your requirement is iteratively appending to an existing list, it is better you use a Redis LIST.
The storage and retrieval approach would be:
Each element of your list would be a string ( which in turn is the
JSON representation of your single dictionary element)Whenever you want to append a dictionary to your existing cache, you
use an LPUSH command on python's redis client. That would
append your new dictionaries to existing Redis list.For data retrieval, you would use LRANGE to retrieve your full
or partial list of dictionaries.LRANGEhas equivalent performance
toHGETALL.
Example with redis client (the same set of commands can be used in the python redis client) :
edited Nov 14 '18 at 8:52
Benyamin Jafari
2,77732036
answered Nov 14 '18 at 6:53
DhruvPathak
28.6k980136
Thanks for the answer, but I encountered with this error:ResponseError: wrong number of arguments for 'lpush' command.
– Benyamin Jafari
Nov 14 '18 at 8:38
problem solved, I had a mistake in.lpush()argument, I forgaot thenamearg.
– Benyamin Jafari
Nov 14 '18 at 8:48
What is0,-1meaning in.lrange(name='pythonDict', start=0, end=-1)?
– Benyamin Jafari
Nov 14 '18 at 8:59
add a comment |
The approach you are using might turn suboptimal, as you are retrieving full data, appending to it, and saving it.
Since your requirement is iteratively appending to an existing list, it is better you use a Redis LIST.
The storage and retrieval approach would be:
Each element of your list would be a string ( which in turn is the
JSON representation of your single dictionary element)Whenever you want to append a dictionary to your existing cache, you
use an LPUSH command on python's redis client. That would
append your new dictionaries to existing Redis list.For data retrieval, you would use LRANGE to retrieve your full
or partial list of dictionaries.LRANGEhas equivalent performance
toHGETALL.
Example with redis client (the same set of commands can be used in the python redis client) :
edited Nov 14 '18 at 8:52
Benyamin Jafari
2,77732036
answered Nov 14 '18 at 6:53
DhruvPathak
28.6k980136
Thanks for the answer, but I encountered with this error:ResponseError: wrong number of arguments for 'lpush' command.
– Benyamin Jafari
Nov 14 '18 at 8:38
problem solved, I had a mistake in.lpush()argument, I forgaot thenamearg.
– Benyamin Jafari
Nov 14 '18 at 8:48
What is0,-1meaning in.lrange(name='pythonDict', start=0, end=-1)?
– Benyamin Jafari
Nov 14 '18 at 8:59
add a comment |
The approach you are using might turn suboptimal, as you are retrieving full data, appending to it, and saving it.
Since your requirement is iteratively appending to an existing list, it is better you use a Redis LIST.
The storage and retrieval approach would be:
Each element of your list would be a string ( which in turn is the
JSON representation of your single dictionary element)Whenever you want to append a dictionary to your existing cache, you
use an LPUSH command on python's redis client. That would
append your new dictionaries to existing Redis list.For data retrieval, you would use LRANGE to retrieve your full
or partial list of dictionaries.LRANGEhas equivalent performance
toHGETALL.
Example with redis client (the same set of commands can be used in the python redis client) :
edited Nov 14 '18 at 8:52
Benyamin Jafari
2,77732036
answered Nov 14 '18 at 6:53
DhruvPathak
28.6k980136
The approach you are using might turn suboptimal, as you are retrieving full data, appending to it, and saving it.
Since your requirement is iteratively appending to an existing list, it is better you use a Redis LIST.
The storage and retrieval approach would be:
Each element of your list would be a string ( which in turn is the
JSON representation of your single dictionary element)Whenever you want to append a dictionary to your existing cache, you
use an LPUSH command on python's redis client. That would
append your new dictionaries to existing Redis list.For data retrieval, you would use LRANGE to retrieve your full
or partial list of dictionaries.LRANGEhas equivalent performance
toHGETALL.
Example with redis client (the same set of commands can be used in the python redis client) :
edited Nov 14 '18 at 8:52
Benyamin Jafari
2,77732036
answered Nov 14 '18 at 6:53
DhruvPathak
28.6k980136
edited Nov 14 '18 at 8:52
Benyamin Jafari
2,77732036
edited Nov 14 '18 at 8:52
Benyamin Jafari
2,77732036
edited Nov 14 '18 at 8:52
Benyamin Jafari
2,77732036
2,77732036
answered Nov 14 '18 at 6:53
DhruvPathak
28.6k980136
answered Nov 14 '18 at 6:53
DhruvPathak
28.6k980136
answered Nov 14 '18 at 6:53
DhruvPathak
28.6k980136
28.6k980136
Thanks for the answer, but I encountered with this error:ResponseError: wrong number of arguments for 'lpush' command.
– Benyamin Jafari
Nov 14 '18 at 8:38
problem solved, I had a mistake in.lpush()argument, I forgaot thenamearg.
– Benyamin Jafari
Nov 14 '18 at 8:48
What is0,-1meaning in.lrange(name='pythonDict', start=0, end=-1)?
– Benyamin Jafari
Nov 14 '18 at 8:59
add a comment |
Thanks for the answer, but I encountered with this error:ResponseError: wrong number of arguments for 'lpush' command.
– Benyamin Jafari
Nov 14 '18 at 8:38
problem solved, I had a mistake in.lpush()argument, I forgaot thenamearg.
– Benyamin Jafari
Nov 14 '18 at 8:48
What is0,-1meaning in.lrange(name='pythonDict', start=0, end=-1)?
– Benyamin Jafari
Nov 14 '18 at 8:59
Thanks for the answer, but I encountered with this error:
ResponseError: wrong number of arguments for 'lpush' command.– Benyamin Jafari
Nov 14 '18 at 8:38
Thanks for the answer, but I encountered with this error:
ResponseError: wrong number of arguments for 'lpush' command.– Benyamin Jafari
Nov 14 '18 at 8:38
problem solved, I had a mistake in
.lpush() argument, I forgaot the name arg.– Benyamin Jafari
Nov 14 '18 at 8:48
problem solved, I had a mistake in
.lpush() argument, I forgaot the name arg.– Benyamin Jafari
Nov 14 '18 at 8:48
What is
0, -1 meaning in .lrange(name='pythonDict', start=0, end=-1)?– Benyamin Jafari
Nov 14 '18 at 8:59
What is
0, -1 meaning in .lrange(name='pythonDict', start=0, end=-1)?– Benyamin Jafari
Nov 14 '18 at 8:59
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53282674%2fhow-to-append-a-dictionary-in-a-redis-cache%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
