Does Spring Content have some limitations regarding file size in PostgreSql? I tried to save 7,4 GB file, works well. But which type is used under the hood, how much data we can save per file
Spring Content JPA detects the database type from the connection and chooses an appropriate BLOB API to use.
In the case of PostgreSql it uses the Large Object API. As such we are constrained by their limitations
Related
There are may blog available around this but still not getting exactly what is needed.
I am trying to write a REST API with Spring Boot and store data in database. Here the database structure may change (new tables can get introduced or some existing names may get renamed).
Which DB can be used so that there would be minimal code changes needed both at java side and DB side.
What could be a best design approach in this scenario considering technology stack as Spring Boot and Azure
Please visualize about your persistent storage? Why Azure Only? Refine question.
e.g. H2 database with Spring Boot is the most memory efficient.
see Lightest Database to be packed with an application
About Minimal code changes - I'd go with one of the ORM - JPA(or Hibernate). So will only need to maintain #Entity class on java side.
Don't forget - minimal changes still need to be addressed at database & Java side.
I have a spring project where the user will upload their files. Other users are going to pay to download that file. What is the best way to achieve this? I'm thinking of converting it to bytes and store it to database. I don't want to directly store the file in some folder in the project. Is there any other way?
You should take a look at the community/companion project Spring Content.
If you are familiar with Spring Data then this project is for unstructured data (i.e. documents, images, videos, etc) what Spring Data is for structured data.
Like Spring Data, it provides a simple, labor-saving programming interface that allows you very quickly and easily create REST APIs for uploading/downloading content, associating that content with Spring Data entities should you want to, and managing it all on the filesystem, or as BLOBs in the database, or in the cloud in something like S3.
Spring Content will provide a programming/modeling framework that should enable you to easily create a content management site with its content behind a paywall.
I am creating a small application using Spring Boot, this application allows users to store XML templates which can be reused in various scenarios.
The XML templates are small and will be less that 100 lines each, also there will not be more than 20 templates. I don't want to use a separate database to store this small information.
Also I don't want to store this information in memory as I want to retain the data when the app is restarted.
What is the suggested option to store this kind of data within the Spring Boot app itself without using an external database ?
Use H2 database with in memory db or save it on local disk. Or you can go for plain old write file to disk and just write a file to the disk and have another file to keep track of meta information for your writes. But this will help you only if you can ensure you have access to servers and they in turn are not volatile. Spring boot as such has not out of box solution for this other than embedded database
My current project uses spring data couch base 1.2.3 Release version where CouchBaseClient object will be there to retrieve save/get data in key value format from couch base server/cluster/bucket. Now we are planning to upgrade spring data couch base version to 2.x, but CouchBaseClient object has been deleted in 2.x instead bucket/cluster beans are available. Bucket object doesn't have any APIs/methods to save/get data in key value format [ i might be wrong, not sure] so request to help me to find out how to proceed further is there a way in 2.x to store data in key value format?
we have plans to upgrade spring boot version to 1.4.4.release as well so if there are any others ways to interact easily with couch base server, please let me know.
My project env info:
Spring boot 1.2.3
Java 1.8
Thanks,
Satish
This is more a factor of the underlying SDK being of a different generation (2nd generation of Couchbase SDKs, where most methods align in all languages/SDKs and the whole API has been made more coherent).
This generation of SDK exposes objects closer to the reality of the Couchbase cluster: Cluster object to connect to the nodes and perform cluster-wide operations, then Bucket to perform data operations.
Spring Data Couchbase 2.x builds on that. In your configuration you'll choose which Bucket to use (see the docs) and as such you'll also be able to inject that Bucket instance if you really need to.
Note that Spring Data Couchbase offers several layers of abstraction on top of the SDK: repositories for CRUD operations around an entity type, then CouchbaseTemplate that offers individually typed operations but is still capable of marshalling to JSON (the SDK is accessible from CouchbaseTemplate).
On the other hand, with the SDK you have to marshall to JSON yourself, either as a JsonObject map-like structure (default) or a String (in which case you need to store and retreive a RawJsonDocument). Working with these Document types is all explained in the SDK's documentation.
I am working on spring batchupdate ,I search on google I didn't find any solution for my problem.
I have two databases(MySQL,ORALCE) I want to read data from mysql and write into oracle by using batch update .
Your problem is unclear.
You can first read the data from MySQL with one Spring JdbcTemplate object initialized with MySql data source, and then use another JdbcTemplate object, initialized with Oracle data source, to write the data.
If you want to do it in one transaction, you will have to use distributed transactions/XA libraries, such as Atomicos, and Spring distributed transaction manager. See here https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-jta.html for details on Spring integration with distributed transactions libraries.