dataman | A data service | Database library
kandi X-RAY | dataman Summary
kandi X-RAY | dataman Summary
A data service-- which has:. The intention is to have a stack of "backend stores" that this unified API can talk with to store the actual data. As such a lot of the features (schema, sharding, etc.) are done independently of the underlying store.
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Top functions reviewed by kandi - BETA
- OrderJoins sorts a collection by a given joinMap .
- MergeResultStreamsUnique merges vshardResults into vshardResults .
- DoWriteJoin performs a forward join .
- MergeResultStreams merges vshardResults into vshardResults .
- MergeAggregateResult merges the results into one Result .
- DoReadJoin performs a read - join query
- Sort sorts the records by the given key .
- DoStreamQuery executes a streaming query .
- MergeResult merges two results into a Result
- DoQuery executes a single SQL query .
dataman Key Features
dataman Examples and Code Snippets
Community Discussions
Trending Discussions on dataman
QUESTION
I have a dataframe (data2) consisting of many different Manufacturers' sales orders with a column called 'num units sold_x'.
If the Manufacturer name exists in a list called Dataman:
I want to update the value of 'num units sold_x' in each row by taking the sum of column in the dataframe called 'EQTUnit' for each particular Manufacturer. It is fine if all the rows for a particular Manufacturer has the same 'num units sold_x' field since this is the sum of 'EQTUnit' for each Manufacturer.
I think it sounds simple but can't seem to wrap my head around this problem. This is what I have so far:
...ANSWER
Answered 2020-Jul-13 at 22:01Use .loc to filter for rows by using .isin() against the dataman list to see if they are in the dataframe.
Then use .groupby and transform on that filtered dataset.
input:
QUESTION
I want to access listener::flow_message (a public variable) which I defined in the subscriber class, in the main() function of my code. in the below code I just did a simple printing of the flow_message parameter to show the problem.
I changed the access modifiers of the flow_message to private and protected but it gets the compilation error and I found that the only way to access this variable in the main function, is to define it as public. I can get some properties like the size of the flow_message vector, in the main using the below command:
ANSWER
Answered 2019-Aug-29 at 15:47You go fetch flow_message[0] but you never add elements into the vector. If the vector is empty, then flow_message[0] don't exist.
Too add elements in the vector, you should publish a message.
But you also should check for elements in the vector:
QUESTION
I've been searching for a while without success. I am trying to convert a Map to a List (discarding key).
Sure, I can do
...ANSWER
Answered 2019-Mar-17 at 21:37QUESTION
I am trying to return return a value and display it in the console.(for now)
The user ID is passed to a "function".
The function will check for this ID in a database and should return the userName.
I know that the correct data is found because the console.log returns the correct infirmation in function itself (see: THIS WORKS)
But the returned value is "undefined" when used return childData.userName;
Calling the function
...ANSWER
Answered 2018-Oct-26 at 09:40I am not 100% sure but I think .forEach does not play nice with breaks and returns. Try changing it to a traditional for of loop and see if that works.
There is no way to stop or break a forEach() loop other than by throwing an exception. If you need such behavior, the forEach() method is the wrong tool.
QUESTION
Refering to Connect Postgresql in C
I asked some help to compile my script of Postgres database connection. This is now compiling well but now I have a problem when I execute it.
There is the code :
...ANSWER
Answered 2017-Mar-30 at 18:56Stick with dynamic linking.
Your problem is that the system cannot find libpq.dll at runtime.
There are two solutions:
Add
C:\Program Files\PostgreSQL\9.6\libto thePATHenvironment variable.Put a copy of
libpq.dllin the same path as your executable.
QUESTION
I'm trying to connect a C script running on Windows to my Postgresql database.
For the moment, I got this script on a website :
...ANSWER
Answered 2017-Mar-26 at 03:32From your edits I see that you have figured out how to use the -I and -L options of gcc by now. Good.
I guess your relaining problem is that you are trying to link with a 64-bit libpq.dll in 32-bit mode or vice versa.
You can set the mode with the gcc options -m32 and -m64.
You can examine the shared library with file libpq.dll, that should tell you if it is a 32-bit or a 64-bit library.
If gcc tells you something like: 64-bit mode not compiled in, you need to install an appropriate version of gcc.
To solve the problem that libpq.dll is not found at run time, either put the directory where it resides into the PATH environment variable, or use the option -Wl,-rpath,.
QUESTION
I am following the example in the vignette on pp. 7-8 (under "Some Basic Examples.")
Here is the code:
...ANSWER
Answered 2017-Mar-18 at 20:51I re-ran your code and it gave a pretty good result (I am hoping that is what you are expecting).
First of all, update all the associated packages, ggplot2, extrafont, xkcdcolors, xkcd, etc.
I just added some extra libraries and a last line to the code that you provided and it worked like a charm,
the code is as follows:
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