README.md

In hrbrmstr/metis: Access and Query Amazon Athena via DBI/JDBC

[](https://codecov.io/gh/hrbrmstr/metis

metis

Access and Query Amazon Athena via DBI/JDBC

Description

In Greek mythology, Metis was Athena’s “helper” so…

Methods are provided to connect to ‘Amazon’ ‘Athena’, lookup schemas/tables, perform queries and retrieve query results via the included JDBC DBI driver.

What’s Inside The Tin?

The following functions are implemented:

Easy-interface connection helper:

• athena_connect Simplified Athena JDBC connection helper

Custom JDBC Classes:

• Athena: AthenaJDBC (make a new Athena con obj)
• AthenaConnection-class: AthenaJDBC
• AthenaDriver-class: AthenaJDBC
• AthenaResult-class: AthenaJDBC

Custom JDBC Class Methods:

• dbConnect-method
• dbExistsTable-method
• dbGetQuery-method
• dbListFields-method
• dbListTables-method
• dbReadTable-method
• dbSendQuery-method

Pulled in from other cloudyr pkgs:

• read_credentials: Use Credentials from .aws/credentials File
• use_credentials: Use Credentials from .aws/credentials File

Installation

devtools::install_git("https://git.sr.ht/~hrbrmstr/metis")
# OR
devtools::install_gitlab("hrbrmstr/metis")
# OR
devtools::install_github("hrbrmstr/metis")

Usage

library(metis)

# current verison
packageVersion("metis")

## [1] '0.3.0'

library(rJava)
library(RJDBC)
library(metis)
library(magrittr) # for piping b/c I'm addicted

dbConnect(
  metis::Athena(),
  Schema = "sampledb",
  AwsCredentialsProviderClass = "com.simba.athena.amazonaws.auth.PropertiesFileCredentialsProvider",
  AwsCredentialsProviderArguments = path.expand("~/.aws/athenaCredentials.props")
) -> con

dbListTables(con, schema="sampledb")

## [1] "elb_logs"

dbExistsTable(con, "elb_logs", schema="sampledb")

## [1] TRUE

dbListFields(con, "elb_logs", "sampledb")

##  [1] "timestamp"             "elbname"               "requestip"             "requestport"          
##  [5] "backendip"             "backendport"           "requestprocessingtime" "backendprocessingtime"
##  [9] "clientresponsetime"    "elbresponsecode"       "backendresponsecode"   "receivedbytes"        
## [13] "sentbytes"             "requestverb"           "url"                   "protocol"

dbGetQuery(con, "SELECT * FROM sampledb.elb_logs LIMIT 10") %>% 
  dplyr::glimpse()

## Observations: 10
## Variables: 16
## $ timestamp             <chr> "2014-09-27T00:00:25.424956Z", "2014-09-27T00:00:56.439218Z", "2014-09-27T00:01:27.4417…
## $ elbname               <chr> "lb-demo", "lb-demo", "lb-demo", "lb-demo", "lb-demo", "lb-demo", "lb-demo", "lb-demo",…
## $ requestip             <chr> "241.230.198.83", "252.26.60.51", "250.244.20.109", "247.59.58.167", "254.64.224.54", "…
## $ requestport           <int> 27026, 27026, 27026, 27026, 27026, 27026, 27026, 27026, 27026, 27026
## $ backendip             <chr> "251.192.40.76", "249.89.116.3", "251.111.156.171", "251.139.91.156", "251.111.156.171"…
## $ backendport           <int> 443, 8888, 8888, 8888, 8000, 8888, 8888, 8888, 8888, 8888
## $ requestprocessingtime <dbl> 9.1e-05, 9.4e-05, 8.4e-05, 9.7e-05, 9.1e-05, 9.3e-05, 9.4e-05, 8.3e-05, 9.0e-05, 9.0e-05
## $ backendprocessingtime <dbl> 0.046598, 0.038973, 0.047054, 0.039845, 0.061461, 0.037791, 0.047035, 0.048792, 0.04572…
## $ clientresponsetime    <dbl> 4.9e-05, 4.7e-05, 4.9e-05, 4.9e-05, 4.0e-05, 7.7e-05, 7.5e-05, 7.3e-05, 4.0e-05, 6.7e-05
## $ elbresponsecode       <chr> "200", "200", "200", "200", "200", "200", "200", "200", "200", "200"
## $ backendresponsecode   <chr> "200", "200", "200", "200", "200", "400", "400", "200", "200", "200"
## $ receivedbytes         <S3: integer64> 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
## $ sentbytes             <S3: integer64> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
## $ requestverb           <chr> "GET", "GET", "GET", "GET", "GET", "GET", "GET", "GET", "GET", "GET"
## $ url                   <chr> "http://www.abcxyz.com:80/jobbrowser/?format=json&state=running&user=20g578y", "http://…
## $ protocol              <chr> "HTTP/1.1", "HTTP/1.1", "HTTP/1.1", "HTTP/1.1", "HTTP/1.1", "HTTP/1.1", "HTTP/1.1", "HT…

Check types

dbGetQuery(con, "
SELECT
  CAST('chr' AS CHAR(4)) achar,
  CAST('varchr' AS VARCHAR) avarchr,
  CAST(SUBSTR(timestamp, 1, 10) AS DATE) AS tsday,
  CAST(100.1 AS DOUBLE) AS justadbl,
  CAST(127 AS TINYINT) AS asmallint,
  CAST(100 AS INTEGER) AS justanint,
  CAST(100000000000000000 AS BIGINT) AS abigint,
  CAST(('GET' = 'GET') AS BOOLEAN) AS is_get,
  ARRAY[1, 2, 3] AS arr1,
  ARRAY['1', '2, 3', '4'] AS arr2,
  MAP(ARRAY['foo', 'bar'], ARRAY[1, 2]) AS mp,
  CAST(ROW(1, 2.0) AS ROW(x BIGINT, y DOUBLE)) AS rw,
  CAST('{\"a\":1}' AS JSON) js
FROM elb_logs
LIMIT 1
") %>% 
  dplyr::glimpse()

## Observations: 1
## Variables: 13
## $ achar     <chr> "chr "
## $ avarchr   <chr> "varchr"
## $ tsday     <date> 2014-09-29
## $ justadbl  <dbl> 100.1
## $ asmallint <int> 127
## $ justanint <int> 100
## $ abigint   <S3: integer64> 100000000000000000
## $ is_get    <lgl> TRUE
## $ arr1      <chr> "1, 2, 3"
## $ arr2      <chr> "1, 2, 3, 4"
## $ mp        <chr> "{bar=2, foo=1}"
## $ rw        <chr> "{x=1, y=2.0}"
## $ js        <chr> "\"{\\\"a\\\":1}\""

cloc::cloc_pkg_md()

| Lang | # Files | (%) | LoC | (%) | Blank lines | (%) | # Lines | (%) | | :--- | -------: | ---: | --: | ---: | ----------: | ---: | -------: | ---: | | R | 8 | 0.89 | 250 | 0.83 | 83 | 0.72 | 194 | 0.79 | | Rmd | 1 | 0.11 | 50 | 0.17 | 32 | 0.28 | 53 | 0.21 |

Code of Conduct

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

hrbrmstr/metis documentation built on May 23, 2019, 8:37 a.m.