R, Call a SQL Server stored procedure with RJDBC - sql

Question

I would like to call a stored procedure from a function in R. See my code below. unfortunately this code only generates a dataframe without values in it. I would like to fix this with RJDBC&DBI, since there seems to be a problem with RODBC.
RPT_09_Hourly_Connected_v3<- function(Year, Month="NULL",State = "NULL",Region="NULL", City="NULL", District="NULL", Subdistrict="NULL" ,Address='NULL'){
drv <- JDBC("com.microsoft.sqlserver.jdbc.SQLServerDriver", "/opt/sqljdbc_3.0/sqljdbc4.jar")
conn <- DBI::dbConnect(drv, "jdbc:sqlserver://***;databaseName=***;user=***;password=***")
sqlText <- paste("exec [dbo].[RPT_09_Hourly_Connected_v3]#Year=",Year,
",#Month=",Month,
",#State=",State,"",
",#Region=",Region,"",
",#City=N'",City,"'",
",#District=",District,"",
",#Subdistrict=",Subdistrict,"",
",#Address=N'",Address,"'",
sep="")
data <- RJDBC::dbGetQuery(conn,sqlText)
}
a<- RPT_09_Hourly_Connected_v3(Year = 2016)
> str(a)
'data.frame': 0 obs. of 9 variables:
$ Regio : chr
$ Stad : chr
$ Stadsdeel : chr
$ Buurtcombinatie: chr
$ Adres : chr
$ Jaar : num
$ Maand : num
$ hourNR : num
$ HoursConnected : num
This worked for me before RODBC crashed. Is there any difference between RODBC and RJDBC?
RPT_09_Hourly_Connected_v3<- function(Year, Month="NULL",State = "NULL",Region="NULL", City="NULL", District="NULL", Subdistrict="NULL" ,Address='NULL'){
dbhandle <- odbcConnect("***;DATABASE=***;UID=***;PWD=***")
data <- sqlQuery(dbhandle,paste("exec [ dbo].[RPT_09_Hourly_Connected_v3]#Year=",Year,
",#Month=",Month,
",#State=",State,"",
",#Region=",Region,"",
",#City=N'",City,"'",
",#District=",District,"",
",#Subdistrict=",Subdistrict,"",
",#Address=N'",Address,"'",
sep=""))
odbcCloseAll()
data
}
If I execute the stored procedure in SQL Server by hand it will look like this:
EXEC #return_value = [dbo].[RPT_09_Hourly_Connected_v3]
#Year = 2016,
#Month = NULL,
#State = NULL,
#Region = NULL,
#City = N'Amsterdam',
#District = NULL,
#Subdistrict = NULL,
#Address = NULL
Can you explain what's wrong and how to fix it?

Answer 1

I find the RODBCext a lot easier to use since it uses parameter binding. It also makes it easier to use NA in place of "NULL" and eliminates the concern about matching up the quote characters correctly.
library(RODBCext)
RPT_09_Hourly_Connected_v3<- function(Year, Month=NA, State = NA, Region=NA, City=NA, District=NA, Subdistrict=NA ,Address=NA){
ch <- odbcDriverConnect([connection_string])
sqlText <- paste("exec [dbo].[RPT_09_Hourly_Connected_v3]#Year=? ",
",#Month=? ",
",#State=? ",
",#Region=? ",
",#City=? ",
",#District=? ",
",#Subdistrict=? ",
",#Address=? ",
sep="")
sqlExecute(channel = ch,
query = sqlText,
data = list(Year, Month, State, Region, City, District, Subdistrict, Address),
fetch = TRUE,
stringAsFactors = FALSE)
}

Answer 2

I found a very easy solution, and I wish I knew this before! Maybe I can help someone else with my answer.
FACT_CHARGESESSION<- function (username, password, country = "NULL",state = "NULL", region = "NULL",city = "NULL",
district = "NULL",subdistrict = "NULL", provider= "NULL",startDateView = "NULL",endDateView = "NULL") {
InstallCandidates <-c("DBI","rJava","RJDBC","dplyr")
toInstall<-InstallCandidates[!InstallCandidates %in% library()$results[,1]]
if(length(toInstall) !=0){install.packages(toInstall,repos="http://cran.r-project.org")}
lapply(InstallCandidates,library,character.only=TRUE)
rm("InstallCandidates","toInstall")
NAME <- "dbo.R_00_ValidTransactions_ID_PW_v4"
options(java.parameters = "- Xmx1024m")
drv <- JDBC("com.microsoft.sqlserver.jdbc.SQLServerDriver", "/opt/sqljdbc_3.0/sqljdbc4.jar")
conn <- dbConnect(drv, "jdbc:sqlserver://***.**.***.***;databaseName=****;user=***;password=***")
# Make a SQL text
sqlText <- paste(NAME, paste(username,password, country,state,region,city,district,subdistrict,provider,startDateView,endDateView,sep=","))
data <- dbGetQuery(conn,sqlText)
return(data)
}
output of sqlText:
"dbo.R_00_ValidTransactions_ID_PW_v4 M.Kooi , Stackoverflow , NULL , NULL , Amsterdam , NULL , NULL , NULL , NULL , NULL , NULL "
Instead of using the SP execute window you just execute now the SP with the paremters in a new query window.

Answer 3

I've used this in the past successfully with RJDBC:
d <- dbGetQuery(conn, paste0("exec my_STOREDPROC #Field1= '",Field1,"';"))
It might be simply a matter of syntax. Hard to tell w/o a reproducible example. Note the extra set of quotes.