Execute Microsoft SQL query on R Shiny - sql-server

Question

I am writing an R-Shiny app. Can some one tell me how to execute a Microsoft SQL query in R Shiny ?
This is what I have done so far:
data <- reactive({
conn <- reactive ({ databaseOpen(serverName="[serverName]", databaseName=[dbName])})
qr <- reactive ({ SELECT * from myTable })
res <- reactive ({databaseQuery(conn = conn,query = qr)})
close(conn)
View(res)
})
Any help is appreciated !

Answer 1

I was able to call a query by creating a function outside of the server and ui functions (in other words, in a global.r). Then the server function could call that query function using one of the inputs in the function.
Here is my code:
queryfunction <- function(zipper){
odbcChannel <- odbcConnect("myconnection")
querydoc <- paste0("
SELECT distinct *
FROM mydb
where substring(nppes_provider_zip,1,2) = '43'
and [provider_type] = 'General Practice'
")
pricetable <- sqlQuery(odbcChannel, querydoc)
close(odbcChannel)
pricetable[which(substring(pricetable$nppes_provider_zip,1,5)==zipper),]
}
server <- shinyServer(function(input, output) {
output$mytable1 <- renderDataTable(data.table(queryfunction(input$zip)))
})

Answer 2

I figured it out. It can be done as:
server.r
serverfun<-function(input, output){
# Storing values in myData variable
myData <- reactive({
# Opening database connection
conn <- databaseOpen(serverName = "myServer",databaseName = "myDB")
# Sample query which uses some input
qr <- paste( "SELECT name FROM Genes g WHERE Id = ",input$myId," ORDER BY name")
# Storing results
res <- databaseQuery(conn = conn,query = qr)
# closing database
databaseClose(conn)
# Returning results
res
})
output$tbTable <- renderTable({
# Checking if myData is not null
if(is.null(myData())){return ()}
# return myData
myData()
})
ui.r
library("shiny")
shinyUI(
pageWithSidebar(
headerPanel("Hide Side Bar example"),
sidebarPanel(
textInput("Id", "Enter ID below","1234")
),
mainPanel(
tabsetPanel(
tabPanel("Data", tableOutput("tbTable"))
)
)
)
)