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Document reading and writing SQLite BLOBs in README #51

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Expand Up @@ -127,3 +127,27 @@ system2(
This project is being realized with financial support from the

<img src="https://www.r-consortium.org/wp-content/uploads/sites/13/2016/09/RConsortium_Horizontal_Pantone.png" width="400">


## Reading and Writing SQLite BLOBs
SQLite supports storing binary data(BLOBS), such as images or files.

## writing a BLOB
you can write binary data into a Sqlite database as follows:

con <- dbConnect(RSQLite::SQLite(), "my_database.db")

## Example: write raw data
data <- chaToRaw("Hello World")

dbExecute(con, "CREATE TABLE test (id INTEGER data BLOB)")
dbExecute(con, "INSERT INTO test (id, data) Values(?, ?)" , params = list(1, data))

## Readig a BLOB

you can read the stored binary data using:

result <- dbGetQuery(con, "SELECT data FROM test WHERE id = 1")
raw_data <- result$data[[1]] rawToChar(raw_data)
dbDisconnect(con)