# Database-creation • REDCapCAST
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# Database-creation

Source: `vignettes/Database-creation.Rmd`
`Database-creation.Rmd`

    library(REDCapCAST)

## Easy data set to data base workflow

THe first iteration of a dataset to data dictionary function is the `ds2dd()`, which creates a very basic data dictionary with all variables stored as text. This is sufficient for just storing old datasets/spreadsheets securely in REDCap.

    mtcars |>
      dplyr::mutate(record_id = seq_len(dplyr::n())) |>
      ds2dd() |>
      str()

The more advanced `ds2dd_detailed()` is a natural development. It will try to apply the most common data classes for data validation and will assume that the first column is the id number. It outputs a list with the dataset with modified variable names to comply with REDCap naming conventions and a data dictionary.

The dataset should be correctly formatted for the data dictionary to preserve as much information as possible.

    dd_ls <- mtcars |>
      dplyr::mutate(record_id = seq_len(dplyr::n())) |>
      dplyr::select(record_id, dplyr::everything()) |>
      ds2dd_detailed()
    dd_ls |>
      str()

Additional specifications to the DataDictionary can be made manually, or it can be uploaded and modified manually in the graphical user interface on the web page.

### Step 3 - Meta data upload

Now the DataDictionary can be exported as a spreadsheet and uploaded or it can be uploaded using the `REDCapR` package (only projects with “Development” status).

Use one of the two approaches below:

#### Manual upload

    write.csv(dd_ls$meta, "datadictionary.csv")

#### Upload with `REDCapR`

    REDCapR::redcap_metadata_write(
      dd_ls$meta,
      redcap_uri = keyring::key_get("DB_URI"),
      token = keyring::key_get("DB_TOKEN")
    )

In the “REDCap R Handbook” more is written on interfacing with REDCap in R using the `library(keyring)`to store credentials in chapter 1.1.

### Step 4 - Data upload

The same two options are available for data upload as meta data upload: manual or through `REDCapR`.

Only the latter is shown here.

    REDCapR::redcap_write(
      dd_ls$data,
      redcap_uri = keyring::key_get("DB_URI"),
      token = keyring::key_get("DB_TOKEN")
    )