Re: world_x
Posted by: Andrzej Religa
Date: August 26, 2016 01:18PM

Hi Christian,

> --1
>
> In my table the createCollection() methods doesn't
> underneath ?
> Does the virtual column should be added?
>
> CREATE DATABASE bd_json;
>
> CREATE TABLE bd_json.tab_vol_json
> (vol_id INT AUTO_INCREMENT PRIMARY KEY,
> details_vol JSON
> );
>
> /*
> CREATE TABLE `CountryInfo` (
> `doc` json DEFAULT NULL,
> `_id` varchar(32) GENERATED ALWAYS AS
> (json_unquote(json_extract(doc, '$._id'))) STORED
> PRIMARY KEY
> ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
> */
>

Note that in your case the column names and their definitions/types differ from what's in the example from the world_x script.
That is why you should not try to create the collection 'manually'.
It's good for the scripts that create the schema using SQL.
When you use X Protocol createCollection() method for that you just don't need to worry about such details.


>
> --2
>
> OK if I want create a collection with the name of
> my table :
>
> \use bd_json
>
> mysql-js> db.createCollection("tab_vol_json")
> MySQL Error (1050): Table 'tab_vol_json' already
> exists at (shell):1:3
> in db.createCollection("tab_vol_json")
>
> and db.getCollections() returns nothing.

That's because both tables and collections are in the same namespace and their names have to be unique.
You already created table 'tabl_vol_json' manually so you can't use this name for the collection.
You need either drop your table first or pick another name for the collection.

Hope it helps.

--
Andrzej Religa
MySQL Developer Tools

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