Large Data Table

Large data table R6 class.

Uses ResultModelManager::ConnectionHandler class to create paginating tables

NOTE Only currently works with sqlite and postgresql database backends (probably redshift too) as this method uses limit and offset for the queries

Alternatively, you might want to subclass this class. For example, if your backend query is against an API such as and ATLAS instance or ATHENA

If subclassing use inheritance and treat this class as an interface to implement - implementing the methods:

get

Public fields

baseQuery

query string sql

countQuery

count query string (should match query). Can be auto generated with sub query (default) but this will likely result in slow results

connectionHandler

ResultModelManager connection handler to execute query inside

Methods

Public methods

• LargeDataTable$new()

• LargeDataTable$getCount()

• LargeDataTable$getPage()

• LargeDataTable$getAllResults()

• LargeDataTable$clone()

---

Method new()

Usage

LargeDataTable$new(connectionHandler, baseQuery, countQuery = NULL)

Arguments

connectionHandler

ResultModelManager connectionHandler instance

baseQuery

base sql query

countQuery

count query string (should match query). Can be auto generated with sub query (default) but this will likely result in slow results

Returns

self get count

---

Method getCount()

execute count query with specified parameters

Usage

LargeDataTable$getCount(...)

Arguments

...

Returns

count Get Page

---

Method getPage()

Usage

LargeDataTable$getPage(pageNum, pageSize = self$pageSize, ...)

Arguments

pageNum

page number

pageSize

page size

...

Returns

data.frame of query result get all results

---

Method getAllResults()

Usage

LargeDataTable$getAllResults(...)

Arguments

...

Returns

data.frame of all results. Used for large file downloads

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Method clone()

The objects of this class are cloneable with this method.

Usage

LargeDataTable$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.