I have a json schema which is not in the form of an excel sheet. Where can I convert it to ERD online automatically ?
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I need some guidance on how to proceed with a problem.
Our integration team receives xml files which are converted to json and sent to pub/sub. We then ingest the json files (or are supposed to) into bigquery.
The problem is that the xml files do not include all possible objects or values all the time. So, I cant create a correct schema in bq to receive the json files. I got the xsd file with an extension file which gives me all possible objects but I don't know how to convert this to a correct bq schema.
Do you have any suggestions on how to create a bq schema from xsd files? I was thinking that if I create an xml file with dummy data (including all objects and more than one object when creating repeated objects) with help of the xsd maybe that xml file may be converted to json and then use the auto-schema detection of bq.
Any suggestions?
Thanks,
Cris
If you have the XSD schema files, you can convert these to a valid JSON schema. There are a few tools that can help you to accomplish this.
Keep in mind that the tools are for general purposes and not for the particular case of BigQuery, so you'll have to tune the result to get a valid JSON schema. For this check the components of a BigQuery schema, and for quick reference the sample provided in the documentation.
I have a JSON file. I'm looking for any program/tool which helps to generate AVRO schema based on that JSON file. I do not care about the data type. It can all be string as long as the AVRO schema structure is generated based on JSON.
The objective is, I'm trying to create a avro file using only json file. To do this, I would require avro schema.
so if I have an avro schema, using avro-tool, I'll be able to generate AVRO file by giving Avro schema and JSON file as input.
Any help/suggestions to proceed further will be greatly appreciated.
Thanks in Advance!
https://github.com/romaanankin/avro-schema-manager
you can generate in from a simple .CSV. Just use the tool above
Greetings is there a tool to mass convert json to csv like this.
EDIT 1
I'm working on a DND application and i am using this jsons but before putting them into a db i want to mass convert them into csv and not one by one with an online tool.
I want to convert JSON files to CSV in nifi. We can achieve this in Python and other programming languages and have multiple articles on it. I have multiple JSON files and each file has different schema(one specific file will have one schema only). I can see there are templates to convert CSV to JSON and other conversions. But I didn't see any template to convert JSON data to CSV. I have gone through the article https://community.hortonworks.com/articles/64069/converting-a-large-json-file-into-csv.html ,however here we are hard coding the schema. As I have multiple files and each file has different schema, I can't hardcode the schema. Any suggestions please.
Conversion between formats is typically done through ConvertRecord by plugging in the appropriate record reader and record writer, in this case a JSON reader and CSV writer.
To make use of the record processors you need to defined Avro schemas for your data and put them in a schema registry, NiFi provides a local one.
There are lots of examples and posts out there about the record stuff, this slide deck shows an example of CSV to JSON, but would be easy to reverse the situation for your scenario:
https://www.slideshare.net/BryanBende/apache-nifi-record-processing
This post has some other info:
https://bryanbende.com/development/2017/06/20/apache-nifi-records-and-schema-registries
In my scenario,Users have the option to upload a CSV file and can map the columns of that CSV file to a predefined schema.I need to reorder the columns of that CSV file based on user mapping and upload it to HDFS. Is there any way to achieve this via a NIFI processor ?
You can accomplish this with a ConvertRecord processor. Register an Avro schema describing the expected format in a Schema Registry (controller service), and create a CSVReader implementation to convert this incoming data to the generic Apache NiFi internal record format. Similarly, use a CSVRecordSetWriter with your output schema to write the data back to CSV in whatever columnar order you like.
For more information on the record processing philosophy and some examples, see Record-oriented data with NiFi and Apache NiFi Records and Schema Registries.