README.md

In keboola/redshift-r-client: Amazon Redshift database driver

Redshift R Driver

Redshift R Driver provides a simple interface to query the Amazon Redshift database from R. Most methods are just wrappers around RJDBC methods. A specical method is used for inserting data frames into database which is done with compound INSERT statements which perform much better than individual INSERT statements.

Installation

Package is available only on Github, so you need to use devtools to install the package

library('devtools')
install_github('keboola/provisioning-r-client', ref = 'master')

Usage

# connect to database
driver <- RedshiftDriver$new()     
driver$connect("myhost.example.com", "mydb", "user", "passwrod", "myschema")

# insert some data
df <- data.frame("foo" = c(1,3,5), "bar" = c("one", "three", "five"))
driver$saveDataFrame(df, "fooBar")

# select data (return a data.frame)
dfResult <- driver$select("SELECT foo, bar, row_num FROM fooBar ORDER BY foo")

# optionally insert row numbers from the data frame
driver$saveDataFrame(df, "fooBar", rowNumbers = TRUE)
dfResult <- driver$select("SELECT foo, bar, row_num FROM fooBar ORDER BY row_num")

# optionally insert data to an existing table
driver$update(
    paste0("CREATE TABLE ", schema, ".fooBar (foo INTEGER, bar CHARACTER VARYING (200));")
)
driver$saveDataFrame(df, "fooBar", incremental = TRUE)

# utility methods
cols <- driver$columnTypes(paste0(schema, ".fooBar"))
cols[["foo"]] # -> "integer"            
driver$tableExists("fooBar") # -> TRUE

# for DML and DML statements use the update method
driver$update("DROP TABLE IF EXISTS fooBar;")  

keboola/redshift-r-client documentation built on May 20, 2019, 8:34 a.m.