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Dmitry Maslennikov · May 27, 2021

For performance reasons, it's possible to define an Index in a way, that some of the columns will be as part of the index itself, just for search, and some data could be in the data part of that index, which will be used to display in the result if requested. So, if your index is somehow corrupted, the SQL engine will expect the values there, and will look for it, so, it will not go to the place where the data originally seat. And as a result, you may not see some of the data in the output rows.

Dmitry Maslennikov · May 27, 2021

Sure, it’s possible to do so. React application is just a frontend side, and IRIS itself can be as a backend server. Or you can write backend server on some other language, e.g. NodeJS, Python, Java or .Net. Which will connect to IRIS as a database.

you can look at my Realworld project, in particular  realization of backend server. The project itself offers, the wide variety of frontends and backends on different languages, and with using different databases. So, you find React frontend which will work with backend on IRIS.

and look at my article about this project

Dmitry Maslennikov · May 21, 2021

Depends on what are you trying to achieve.

Import as is, with an iterator

Class User.Test Extends (%RegisteredObject, %JSON.Adaptor)
{

Property name As %String;

ClassMethod Import()
{
  Set data = [{
    "name": "test1"
  },
  {
    "name": "test2"
  }]

  Set iter = data.%GetIterator()
  While iter.%GetNext(.key, .value) {
    Set obj = ..%New()
    Set tSC = obj.%JSONImport(.value)
    Write !,obj.name
  }
}

}

Import with a wrapper object

Class User.TestList Extends (%RegisteredObject, %JSON.Adaptor)
{

Property items As list Of User.Test;

ClassMethod Import()
{
  Set data = [{
    "name": "test1"
  },
  {
    "name": "test2"
  }]

  #; wrap to object
  Set data = {
    "items": (data)
  }

  Set list = ..%New()
  Set tSC = list.%JSONImport(.data)

  For {
    set obj = list.items.GetNext(.key)
    Quit:key=""
    Write !,obj.name
  }
}

}