qryflow (version 0.2.0)

register_qryflow_type: Register custom chunk types

Description

Use these functions to register the parsers and handlers associated with custom types. register_qryflow_type is a wrapper around both register_qryflow_parser and register_qryflow_handler.

Usage

register_qryflow_type(type, parser, handler, overwrite = FALSE)
register_qryflow_parser(type, parser, overwrite = FALSE)
register_qryflow_handler(type, handler, overwrite = FALSE)

Value

Logical. Indicating whether types were successfully registered.

Arguments

type

Character indicating the chunk type (e.g., "exec", "query")

parser

A function to parse the SQL associated with the type. Must accept arguments "x" and "..." and return a qryflow_chunk object.

handler

A function to execute the SQL associated with the type. Must accept arguments "chunk", "con", and "...".

overwrite

Logical. Overwrite existing parser and handler, if exists?

Details

To avoid manually registering your custom type each session, consider adding the registration code to your .Rprofile or creating a package that leverages .onLoad()

Examples

# Create custom parser #####
custom_parser <- function(x, ...){
  # Custom parsing code will go here

  # new_qryflow_chunk(type = "custom", name = name, sql = sql_txt, tags = tags)
}

# Create custom handler #####
custom_handler <- function(con, chunk, ...){
  # Custom execution code will go here...
  # return(result)
}

# Register Separately #####
register_qryflow_parser("custom", custom_parser, overwrite = TRUE)

register_qryflow_handler("custom", custom_handler, overwrite = TRUE)


# Register Simultaneously #####
register_qryflow_type("query-send", custom_parser, custom_handler, overwrite = TRUE)