yserial | NoSQL y_serial Python module – warehouse compressed objects | Database library
kandi X-RAY | yserial Summary
kandi X-RAY | yserial Summary
TL;DR single module file: yserial = serialization + persistance. In a few lines of Python code, compress and annotate Python objects into SQLite; then later retrieve them chronologically by keywords without any SQL. Highly useful NoSQL "standard" module for a database to store schema-less data. It is based on key/value where the conceptual key is. and the value is any reasonable object. We generally mean Python objects, but we include support for files (binary, image, etc.) and URL content (e.g. webpages). Python objects are strings, dictionaries, lists, tuples, classes, and instances. Objects are inserted into a hierarchy: database file, table within that database, row within table. Moreover, each object is annotated for reference by "notes" and automatically timestamped. You are spared from explicitly spelling out many of the difficult protocol details: cursor/connection, SQL/DB-API implementation, serialization, compression, search algorithm, etc. -- for these are optimized to interact with speed, security, and concurrency -- yet handled transparently. And our module is faster than comparable approaches under PostgreSQL. We highly recommend SQLite because it requires neither separate installation nor a server process; also, it uses single normal files (easy to backup or send), not an elaborate filesystem. Moreover, in comparison to similar applications with MySQL or PostgreSQL, SQLite is extremely fast and suits most purposes wonderfully. [The computing center at Harvard's math department asserts that yserial "provides a very reliable NoSQL interface for SQLite," see ]. The means for insertion, organization by annotation, and finally retrieval are designed to be simple to use. The notes effectively label the objects placed into the database. We can then later query the database, for example, by regex (regular expression) searching on notes, and placing the qualified objects in a dictionary. The keys of this dictionary correspond to the unique primary keys used in the database. We can thus use Python code to process the contents of this qualified dictionary, in effect, a data subset. If the objects in that dictionary are themselves dictionaries we are essentially dealing with schema-less data.
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Top functions reviewed by kandi - BETA
- Test for testing purposes .
- testfarm farm
- Perform a copysub .
- View a subquery .
- Respond to a SQL query .
- Creates a forest .
- return the maximum number of matching objects
- Convert csv string to list .
- Insert multiple objects into the database .
- Yields the contents of a file .
yserial Key Features
yserial Examples and Code Snippets
Community Discussions
Trending Discussions on Database
QUESTION
I want to be able to (at run time) create or alter a DB schema dynamically on a particular event (e.g. click of a button) using FormHandler microservice of Gramex.
...ANSWER
Answered 2022-Apr-08 at 06:20You can do it using queryfunction of FormHandler which can modify the query based on the query parameters passed in the url.
Refer the link below for more https://gramener.com/gramex/guide/formhandler/#formhandler-queryfunction
QUESTION
I am getting the following error while trying to upload a dataset to Hub (dataset format for AI) S3SetError: Connection was closed before we received a valid response from endpoint URL: "<...>".
So, I tried to delete the dataset and it is throwing this error below.
CorruptedMetaError: 'boxes/tensor_meta.json' and 'boxes/chunks_index/unsharded' have a record of different numbers of samples. Got 0 and 6103 respectively.
Using Hub version: v2.3.1
...ANSWER
Answered 2022-Mar-24 at 01:06Seems like when you were uploading the dataset the runtime got interrupted which led to the corruption of the data you were trying to upload. Using force=True while deleting should allow you to delete it.
For more information feel free to check out the Hub API basics docs for details on how to delete datasets in Hub.
If you stop uploading a Hub dataset midway through your dataset will be only partially uploaded to Hub. So, you will need to restart the upload. If you would like to re-create the dataset, you can use the overwrite = True flag in hub.empty(overwrite = True). If you are making updates to an existing dataset, you should use version control to checkpoint the states that are in good shape.
QUESTION
I ran into an issue that I haven't found a solution to yet. I have a collection with dozens of documents that every one of the documents contains a list (let's use the name 'list' as a key for that list) with ids of other documents(they are connected in some way).
some of the documents in the collection were deleted and I try to find all the documents that contain the ids of documents that do not exist anymore in the collection.
example:
As to the example above: I want to get the document with the id : 5e3266e9bd724a000107a902 because it contains a list with the id 5e32a7f7bd724a00012c1104 that does not exist anymore.
...ANSWER
Answered 2022-Mar-02 at 03:10Here is a solution that works exploiting $lookup on the same collection (think "self-JOIN"):
QUESTION
Given a connection to the PostgreSQL database for user 'Alice', is there a statement that could be executed to switch to user 'Bob'?
Motivation: Looking to avoid having separate pools for each user (i.e. re-use a connection that was previously used by another user).
...ANSWER
Answered 2022-Mar-01 at 22:09In PgAdmin open part Login/Group roles. Right click and in opened window enter new user, set permission and defined password. After refresh you will see e.g. Alice in Login/Group roles. After that open database with logged user. Click on something like mondial/postgres@PostgresSQL (db/user@server) and choose new connection. Chose which db wish to use and user wich will be connected on db.
After that you will have mondial/Alice@PostgresSQL
QUESTION
ANSWER
Answered 2022-Feb-28 at 12:43The problem consist from creating connection in separate file (must be create in App).
QUESTION
As the title suggests I'm wondering how to create an effective index for GROUP BY queries in CosmosDB.
Say the documents look something like:
...ANSWER
Answered 2021-Sep-27 at 20:51Currently GROUP BY does not not yet use the index.
This is currently being worked on. I would revisit sometime towards the end of the year to verify it is supported.
QUESTION
i have a database field that is set to decimal, while in my Go project i am having problem choosing which datatype can be use. each time i send a create reuquest to my code, i get a "cannot marshal 'decimal' into #golang datatype#
this my database schema
...ANSWER
Answered 2022-Feb-15 at 12:13If you look into documentation for Gocql package, then you will see that the decimal is mapped to the Go's infDec data type (see its doc) so you need to use it instead of Float64.
QUESTION
I want to copy one big database table to another. This is my current approach:
...ANSWER
Answered 2022-Jan-20 at 12:45You can also "copy on database level" from within ABAP SQL using a combined INSERT and SELECT:
QUESTION
- Hi, we are trying to upgrade 2.0.202 from 1.4.200. We are getting an error related to running our tests. While persisting data we are getting below error. Any suggestions?
Caused by: org.h2.jdbc.JdbcSQLIntegrityConstraintViolationException: NULL not allowed for column "***"; SQL statement:
...ANSWER
Answered 2022-Jan-31 at 01:05You cannot use H2 2.0.202 with Hibernate ORM 5.6, because H2Dialect in Hibernate ORM produces invalid SQL for H2, H2 2.x is more restrictive and doesn't accept it by default.
H2 2.0.204 and later versions (current version is 2.1.210) have a LEGACY compatibility mode, it can be enabled by appending ;MODE=LEGACY to JDBC URL. This mode provides some limited compatibility with old versions of H2.
This trick shouldn't be required for Hibernate ORM 6.0 when it will be released.
Edited
Changes for H2 2.x.y were backported to Hibernate ORM 5.6.5.
QUESTION
I am confused in choosing database service for my flutter application. I started using firebase but as it is based on NoSQL , But if i am getting the need for rows and columns for my data which backend service should i use!.
...ANSWER
Answered 2022-Jan-23 at 23:20I think it depends on how you want to access the data. If you're wanting to stream and push notifications, I would stick with Firebase. If you just need to get and post data, focus more on api implementation. With a solid rest api, you can change up your database/backend all you want and just have to update the api, not your app.
I, personally, suggest searching around for data modeling techniques in Firebase. Check out the Fireship channel on youtube. In his channel's videos, search for modeling and you'll find a ton of info on Firebase data modeling. Many will reference Angular, but the techniques are the same.
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Install yserial
You can use yserial like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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