How to pass input variable to SQL statement in R shiny?

Question

Usually, variables can be passed to SQL statements using paste. Interestingly this doesn\'t work with input variables in R shiny. Using the below code I get the following er

Answer 1

The data query needs to be evaluated in a reactive context.

One way would be to move the data query itself into the renderPlot() context e.g.

--server.R--

shinyServer(function(input, output) {

 database <- dbConnect(MySQL(), group= "zugangsdaten", dbname= 'database')

 output$main_plot <- renderPlot({

   table <- dbGetQuery(database, statement = 
              paste("
                SELECT a,b FROM table1
                WHERE id = ",input$segment,"
                AND created_at>='2015-08-01'
              "))

    plot(table$a,table$b)

 })

})

However, it's better to construct a reactive conductor for the data which can be evaluated once when any updates happen and re-used in multiple reactive end-points (see here for details).

This would look something like:

--server.R--

shinyServer(function(input, output) {

 database <- dbConnect(MySQL(), group= "zugangsdaten", dbname= 'database')

 table <- reactive({
            dbGetQuery(database, statement = 
              paste("
                SELECT a,b FROM table1
                WHERE id = ",input$segment,"
                AND created_at>='2015-08-01'
              ")
            )
          })

 output$main_plot <- renderPlot({

    plot(table()$a,table()$b)

 })

}) 

Answer 2

For flexibility you can also use sub function to substitute part of the query string, this is quite clean approach

table <- reactive({ 
  my_query <- 'SELECT a,b FROM table1 WHERE id = SOMETHING AND created_at >= 2015-08-01'
  my_query <- sub("SOMETHING",input$segment,my_query)
  dbGetQuery(database,noquote(my_query))
})