postgres-protobuf | Protocol Buffer extension for PostgreSQL | Serialization library
kandi X-RAY | postgres-protobuf Summary
kandi X-RAY | postgres-protobuf Summary
Protobufs have a well-defined JSON representation supported by most implementations. Using that for storage (as json or jsonb) is a valid strategy if efficiency is not a major concern. Note that JSON protobufs store fields by name instead of by number, which means that field renames will break backwards- and forwards-compatibility.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of postgres-protobuf
postgres-protobuf Key Features
postgres-protobuf Examples and Code Snippets
SELECT protobuf_query('MyProto:some_submessage.some_map[some_key]', my_proto_column) FROM ...;
-- or for multiple results as an array
SELECT protobuf_query_array('MyProto:some_repeated_field[*].some_map[*].some_field', my_proto_column) FROM ...;
--
make
sudo make install
CREATE EXTENSION postgres_protobuf;
INSERT INTO protobuf_file_descriptor_sets (name, file_descriptor_set)
VALUES ('default', contents_of_file)
SELECT protobuf_query('path.to.Message:path.to.field', protobuf_as_byte_array) AS result;
Community Discussions
Trending Discussions on Serialization
QUESTION
I am trying to find a simple and efficient way to (de)serialize enums in Scala 3 using circe
.
Consider the following example:
...ANSWER
Answered 2022-Jan-23 at 21:34In Scala 3 you can use Mirrors to do the derivation directly:
QUESTION
Java's ArrayList
uses custom serialization and explicitly writes the size
. Nevertheless, size is not marked in ArrayList
as transient
. Why is size written two times: once via defaultWriteObject
and again vis writeInt(size)
as shown below (writeObject
method)?
ANSWER
Answered 2022-Mar-14 at 21:59It exists solely for compatibility with old java versions.
detailsIf you take a look at the comment above s.writeInt(size)
, you can see that this is supposed to be the capacity. In previous java versions, the serialized form of ArrayList
had a size and a capacity.
Both of them represent actual properties of an ArrayList
. The size
represents the number of items in the ArrayList
while the capacity
refers to the number of of possible items (length of the array) in it without the array needing to be recreated.
If you take a look at readObject
, you can see that the capacity is ignored:
QUESTION
I have a problem with Object-Oriented Project Hangman - serialization part. I saved my code in serialize method, but when I try to unserialize it, I have a problem with it. I see all components of classes in the YAML file and when I try to reach them with code, I can't do it. I don't know where the problem is. Here is my serialize method and deserialize method.
...ANSWER
Answered 2022-Feb-20 at 14:15I think it's actually working fine.
YAML.load
returns an different instance of Game. You can call methods on that instance, but you don't have any access to the properties.
QUESTION
I've attached the boost sample serialization code below. I see that they create an output archive and then write the class to the output archive. Then later, they create an input archive and read from the input archive into a new class instance. My question is, how does the input archive know which output archive its reading data from? For example, say I have multiple output archives. How does the input archive that is created know which output archive to read from? I'm not understanding how this is working. Thanks for your help!
...ANSWER
Answered 2022-Feb-13 at 16:00Like others said, you can set up a stream from existing content. That can be from memory (say istringstream
) or from a file (say ifstream
).
All that matters is what content you stream from. Here's you first example modified to save 10 different streams, which can be read back in any order, or not at all:
QUESTION
I have one call that return different objects name, in this case, each name is the hash of your wallet address, but I would like to treat them indifferently because all that matters is the data that is inside them, using a standard converter like Gson I am not able to do this, is there any way to do it manually?
...ANSWER
Answered 2022-Jan-25 at 12:34As I understand your question, this is less to do with retrofit and more with JSON parsing. Because the payload structure is a bit awkward I suggest you consume it in two steps:
- step 1. Consume the
content
success
,cache_last_updated
andtotal
- step 2. Add the
id
QUESTION
I have the following code which exports an object to an XML file, then reads it back in and prints it on the Information stream.
...ANSWER
Answered 2021-Dec-30 at 22:40The CliXml serializer is exposed via the [PSSerializer]
class:
QUESTION
Is there a way to generate a nested JavaScript Object
from entries?
Object.fromEntries()
doesn't quite do it since it doesn't do nested objects.
ANSWER
Answered 2021-Dec-03 at 17:50I think I found a way using lodash
:
QUESTION
I have an enum that I'd like to deserialize from JSON using kotlinx.serialization while ignoring unknown values. This is the enum
...ANSWER
Answered 2021-Sep-24 at 12:41For now I think that the only way would be to use coerceInputValues
option with default value of enum field to be null like in this example:
QUESTION
I am using SharpSerializer to serialize/deserialize object.
I want the ability to ignore specific properties when deserializing.
SharpSerializer has an option to ignore properties by attribute or by classes and property name:
...ANSWER
Answered 2021-Nov-10 at 17:43You are correct that SharpSerializer does not implement ignoring of property values when deserializing. This can be verified from the reference source for ObjectFactory.fillProperties(object obj, IEnumerable properties)
:
QUESTION
I have a manytomany relation mapped with a custom table to add an extra column. I can deserialize it, but deserialized it shows the elements of the join table, I would to just the joined element. So what I currently get is the following:
...ANSWER
Answered 2021-Aug-18 at 01:35It seems like you would like an array of numbers being returned to the client.
You could create a getter that returns the array of ids and turn the other relationship as not serializable via annotations.
The fact that you only need one of the ids might be an indication of non ideal mapping in the database.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install postgres-protobuf
Postgres server headers (if you use the Postgres APT repo, install postgresql-server-dev-$VERSION)
A (mostly) C++17-capable compiler (Ubuntu 18.04's default GCC 7.4.0 works)
Prebuilt binaries are here. Currently they are built with and tested on Ubuntu 18.04 only. You can build your own binary package from source with make dist.
copy the contents of lib/ to /usr/lib/postgresql/11/lib/
copy the contents of extension/ to /usr/share/postgresql/11/extension/
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