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Web_scraping_R_SQLServer.sql
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Web_scraping_R_SQLServer.sql
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/*
Title: SqlSaturday statistics - web scraping with R and SQL Server
Author: Tomaz Kastrun
Blog: http://tomaztsql.wordpress.com
Date; 13.11.2017
*/
USE [master];
GO
CREATE DATABASe SQLSaturday;
GO
USE SQLSaturday;
GO
/*
-- TEST
EXEC sp_execute_external_script
@language = N'R'
,@script = N'
library(curl)
library(httr)
library(rvest)
library(XML)
url_schedule <- ''http://www.sqlsaturday.com/687/Sessions/Schedule.aspx''
cf <- curl_fetch_memory(url_schedule, handle=TRUE)
cf$status_code
OutputDataSet <- data.frame(cf)
'
*/
DROP TABLE IF EXISTS SQLSatSessions;
GO
CREATE TABLE SQLSatSessions
(
id SMALLINT IDENTITY(1,1) NOT NULL
,SqlSat SMALLINT NOT NULL
,SqlSatTitle NVARCHAR(500) NULL
,SQLSatSpeaker NVARCHAR(200) NULL
)
CREATE OR ALTER PROCEDURE GetSessions
@eventID SMALLINT
AS
DECLARE @URL VARCHAR(500)
SET @URL = 'http://www.sqlsaturday.com/' +CAST(@eventID AS NVARCHAR(5)) + '/Sessions/Schedule.aspx'
PRINT @URL
DECLARE @TEMP TABLE
(
SqlSatTitle NVARCHAR(500)
,SQLSatSpeaker NVARCHAR(200)
)
DECLARE @RCODE NVARCHAR(MAX)
SET @RCODE = N'
library(rvest)
library(XML)
library(dplyr)
library(httr)
library(curl)
library(selectr)
#URL to schedule
url_schedule <- "'
DECLARE @RCODE2 NVARCHAR(MAX)
SET @RCODE2 = N'"
#Read HTML
webpage <- html_session(url_schedule) %>%
read_html()
# Event schedule
schedule_info <- html_nodes(webpage, ''.session-schedule-cell-info'') # OK
# Extracting HTML content
ht <- html_text(schedule_info)
df <- data.frame(data=ht)
#create empty DF
df_res <- data.frame(title=c(), speaker=c())
for (i in 1:nrow(df)){
#print(df[i])
if (i %% 2 != 0) #odd flow
print(paste0("title is: ", df$data[i]))
if (i %% 2 == 0) #even flow
print(paste0("speaker is: ", df$data[i]))
df_res <- rbind(df_res, data.frame(title=df$data[i], speaker=df$data[i+1]))
}
df_res_new = df_res[seq(1, nrow(df_res), 2), ]
OutputDataSet <- df_res_new ';
DECLARE @FINAL_RCODE NVARCHAR(MAX)
SET @FINAL_RCODE = CONCAT(@RCODE, @URL, @RCODE2)
-- PRINT @FINAL_RCODE
INSERT INTO @Temp
EXEC sp_execute_external_script
@language = N'R'
,@script = @FINAL_RCODE
INSERT INTO SQLSatSessions (sqlSat,SqlSatTitle,SQLSatSpeaker)
SELECT
@EventID AS sqlsat
,SqlSatTitle
,SqlSatSpeaker
FROM @Temp
-- the best SQLSaturday event - SQLSaturday Slovenia
EXECUTE GetSessions @eventID = 687
--- Walk through 100 EVENTS
DECLARE @i SMALLINT = 600
WHILE (@i < 690)
BEGIN
EXECUTE GetSessions @eventID = @i
SET @i += 1
SELECT CONCAT('Working on SQLSat event ', @i)
END