I am working on Proof of concept regarding the integration of MariaDB Dynamic column concept with Java. So the problem is the column will be in BLOB and the data will be stored in key - value pairs. Currently when byte[] is returned from the database doesnot have any JSON object format or any separators. So its very hard to parse the data and find the value for a key. This can be done using Native queries in Java. But how to retrieve data using JPA/Hibernate or will they support Dynamic columns?
Thanks in Advance.
Have you tried to retrieve the data as COLUMN_JSON(dyncol)? Read more about it here: https://mariadb.com/kb/en/mariadb/column_json/
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In an Oracle database I have like more than 178692 rows regarding to a store items. I need to develop regular web application using java and front-end will be plain html. is there any caching modular way to retrieve data from the front-end.
Bellow are my column headers and are all String of data type.
enterITM_DESC = *CHOCBOX WHITE CHOCOLA.BAR 50G,
ITEM_CODE=GRCO66760,
PLU_CODE =23270 code here
I need my searching functionality to be implemented item_desc and item_code will be the key for any instance.
Your help matters a lot thanks in advance.
I have using maria db to store dynamic columns.In sql Query it is there in the maria db documentation. https://mariadb.com/kb/en/library/dynamic-columns/ .
But i couldn't find a spring boot jpa implementation.I have tried jpa native query.I am storing a Json in this dynamic column which is data type of Blob in maria db.But it is very tough because i couldn't find a way to store when json is nesting another objects or arrays.Is there any way to accomplish this task
JSON is just a string. It could be stored in a TEXT or BLOB column.
The issue is that it is a structured string and it is tempting to reach into it to inspect/modify fields. Don't. It won't be efficient.
Copy values out of the JSON that you need for WHERE or ORDER BY (etc) so that MySQL/MariaDB can efficiently access them. Sure, keep copies inside the JSON text/blob, if you like.
Please describe your use for JSON, there may be more tips on "proper" usage inside a database.
That being said, MariaDB 10.2 has picked up much of Oracle's JSON. But there is not a JSON datatype. And there are a few function differences.
And this does not explain how far behind the 3rd party software (spring-boot, etc) is.
Been playing with MariaDB and really enjoy the NoSQL aspect of MariaDB in that we can add JSON into a column and do combined query for the Relational and the JSON part of a record. More info here: https://mariadb.com/kb/en/mariadb/dynamic-columns/
I'm not trying to hook MariaDB into my code.
Following this page https://springframework.guru/configuring-spring-boot-for-mariadb/ been able to connect to MariaDB from Java code, add and edit data like a normal relational database.
Thought I'm not sure how to use the NoSQL aspect of it from Java.
Namely adding a Blob column that will contain JSON - what Java Data type represent it. And how do querying.
I've been doing alot of research on web and couldn't find anything. Any assistance appreciated.
You will have to set the Query parameter to = "" ; Try it and post the results.
I was working on storing a data in azure tables in a meanwhile I found JSON support for Azure tables here. So for a change of plan now I have a data in JSON format i need it to store on azure tables.I found few code snippets but all were for c#. Can you please guide me ?
Thanks in Advance
Azure Table Storage is a Key/Value pair store as opposed to a document store (a good example for that would be DocumentDB). Essentially a table contains entities (broadly think of them as rows) and each entity contains some attributes (broadly think of them as columns). Each attribute consist of 3 things: Attribute name (that would be the key in key/value pair), attribute value (that would the value in key/value pair) and attribute data type.
To answer your question, yes, you can store a JSON document in Azure Tables but that goes in as an attribute thus you need to assign a key to your JSON document. Furthermore each attribute can't be more than 64KB in size so you would need to take that into consideration.
If your requirement is to store JSON documents, I woul recommend looking into DocumentDB. It is more suitable for storing JSON data and doing many more things that Azure Tables can't do.
Regarding your comment about JSON support for Azure table, it talks about the format in which data is sent to/retrieved from Azure tables. In the earlier days, data was transmitted using ATOM PUB XML format which made the request payload/response body really bulky. With JSON format, the size is considerably reduced. However no matter which way you go, Azure Tables store the data in key/value pair format.
#AnandDeshmukh, Based on my understanding, I think you might want to use Java to write the similar code with C#. I suggest that you can try to refer to the javadoc of Azure Storage SDK to rewrite the sample code in Java.
For example, you can use the Java code instead of the C# code as below.
C# code:
CloudTableClient tableClient = new CloudTableClient(baseUri, cred)
{
// Values supported can be AtomPub, Json, JsonFullMetadata or JsonNoMetadata
PayloadFormat = TablePayloadFormat.JsonNoMetadata
};
Java code:
CloudTableClient tableClient = new CloudTableClient(baseUri, cred)
tableClient.getDefaultRequestOptions().setTablePayloadFormat(TablePayloadFormat.JsonNoMetadata);
Performance wise, is it smart to do this?
An example would be with Gson
Gson gson = new Gson();
String json = gson.toJson(myObject);
// store json string in sql with primary key
// retrieve json string in sql with primary key
I want to simplify the way i store and retrieve objects, instead of building and separating them into pieces and individual columns each time i store/retrieve from a database.
But my concern with using a json string is that the length may impact performance when the database fills up? Im not sure, this is why im asking.
There is not an issue with 'space' used or performance of such: MySQL will deal with that just fine.
That is, while the entire JSON chunk must be pulled/pushed for processing and changes MySQL will continue to handle such as best it ever did, even 'as the database fills up'.
However, there are problems with normalization and opaqueness of information when following this design. Databases are about information, but a blob of JSON is just .. a blob of JSON to an SQL database.
Because of this none of the data in the JSON can be used for relationships or queries nor can it participate in indices or constraints. So much for the "relational" part of the database..
Unless the JSON truly is opaque data, like the contents of a binary file, consider working on relevant normalization .. or switch to a (JSON) document-oriented database (eg. Raven, Redis, Couch, Mongo).
There is no space or performance issues with storing JSON strings. MySQL is capable to handle large blobs, if you need so.
The decision whether to store your data serialized into JSON or not should be based on how do you need to process this data. Relational databases, such as MySQL, suppose that you normalize the data and establish relationships between records. That said, in many cases it can be practical to do otherwise (i.e. store as JSON).
If you will store your data as JSON strings, you will not be able to effectively process this data using MySQL features, e.g. you cannot filter out or sort records by values stored as JSON. However, if you need only to store this data, while the processing is going to be done by the application code, it can be reasonable to use JSON.
As document-oriented databases like MongoDB become more popular, some of the traditional relational databases, such as PostgreSQL and MariaDB, recently also implemented native JSON support.