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Amazon RDS MySQL support for JSON functions


Amazon RDS MySQL support for JSON functions

By : smalld01
Date : November 22 2020, 02:42 PM
this one helps. JSON is a feature added in MySQL version 5.7.8. The latest version of MySQL that RDS currently supports is 5.6.23. The only solution is to wait for Amazon to add support for MySQL 5.7.8.
By the way you can look in your RDS console to see what version of MySQL your RDS instance is using.
code :


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MySQL does not support recursive functions? why? since when?

MySQL does not support recursive functions? why? since when?


By : weberson
Date : March 29 2020, 07:55 AM
will help you No problem, Jenco. Not so efficient as PostgreSQL functions, but it's possible in MySQL procedures also:
code :
DELIMITER $$
DROP PROCEDURE IF EXISTS test.factorial_proc$$
CREATE PROCEDURE test.factorial_proc
(
   IN n   BIGINT, 
  OUT res BIGINT 
) 
BEGIN
  SET max_sp_recursion_depth=10; 
  IF n >= 2 THEN
    CALL test.factorial_proc (n-1, res);
    SELECT n * res INTO res;
  ELSE
    SELECT n INTO res;
  END IF;
END$$
DELIMITER ;

[test]> CALL test.factorial_proc (5, @res);
[test]> CALL test.factorial_proc (5, @res1);
[test]> select @res * @res1;
+--------------+
| @res * @res1 |
+--------------+
|        14400 |
+--------------+
Batoo support for Amazon RDS, S3 and MySQL

Batoo support for Amazon RDS, S3 and MySQL


By : Jack He
Date : March 29 2020, 07:55 AM
wish of those help Batoo supports MySql as a first class citizen including joins. As Batoo JPA is a pure spec implementation, It will produce SQL joins of inner and left joins according to the Jpa fetch and fetch types.
For the amazon support, it should just work. You can follow the compatibility test case from https://github.com/BatooOrg/BatooJPA/issues/187
Native JSON support in MYSQL 5.7 : what are the pros and cons of JSON data type in MYSQL?

Native JSON support in MYSQL 5.7 : what are the pros and cons of JSON data type in MYSQL?


By : Michael
Date : March 29 2020, 07:55 AM
I wish this helpful for you In MySQL 5.7 a new data type for storing JSON data in MySQL tables has been added. It will obviously be a great change in MySQL. They listed some benefits
code :
SELECT * FROM t1
WHERE JSON_EXTRACT(data,"$.series") IN ...
ALTER TABLE t1
  ADD COLUMN series AS (JSON_EXTRACT(data, '$.series')),
  ADD INDEX (series);
SELECT * FROM t1
WHERE series IN ...
SELECT JSON_EXTRACT(data, '$.series') AS series FROM t1
WHERE <other conditions>
SELECT * FROM t1
WHERE JSON_EXTRACT(data,"$.series") IN ...
How can I unload data from Amazon Aurora MySQL to Amazon S3 like Amazon Redshift?

How can I unload data from Amazon Aurora MySQL to Amazon S3 like Amazon Redshift?


By : Mohamed Mohamed
Date : March 29 2020, 07:55 AM
may help you . After this answer was originally written (the answer at thst time was "no"), Aurora added this capability.
add XML support to JSON handling functions in ROR

add XML support to JSON handling functions in ROR


By : Alice Jose
Date : March 29 2020, 07:55 AM
this one helps. So, you should take advantage of the standard routes and actions. In routes.rb, you might do something like:
code :
Rails.application.routes.draw do
  resources :messages     
  namespace :api, defaults: {format: 'json'} do
    namespace :v1 do
      resources :messages
    end
  end
end
class Api::V1::MessagesController < Api::V1::BaseController

  def create
    @message = Message.new(message_params)
    respond_to do |format|
      if @message.save
        @message.update(url: "http://link.com/#{@message.id}")
        format.json { render json: create_hsh, status: :ok }
        format.xml  { render xml: create_hsh, staus: :ok }
      else
        format.json { render json: @message.errors, status: :unprocessable_entity }
        format.xml  { render xml:  @message.errors, status: :unprocessable_entity }
      end
    end
  end

  def show 
    respond_to do |format|
      if @message = Message.find_by(id: params[:id])
        format.json { render json: show_hsh, status: :ok }
        format.xml  { render xml: show_hsh, status: :ok }
      else
        format.json { render json: {errors: :not_found}, status: :not_found }
        format.xml  { render xml: {errors: :not_found}, status: :not_found } 
      end
    end
  end

private

  def create_hsh
    @message.attributes.with_indifferent_access.slice(:url)
  end

  def show_hsh
    attr = @message.attributes.with_indifferent_access
    attr.slice(:foo, :bar).merge!(message: attr[:text])
  end

  def message_params
    params.require(:message).permit(:text)
  end

end
class Api::V1::BaseController < ActionController::API
  before_action :authorize

  def authorize
    # do your checks in a way that results in a variable @authorized?
    render(json: {errors: :unauthorized}, status: :unauthorized) unless @authorized?
  end

end
http://your.api.com/messages.json
http://your.api.com/messages.xml 
http://your.api.com/messages
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