【发布时间】：2025-11-30 22:20:02
【问题描述】：
我想在 BigQuery 的 baseball 公共数据中选择变量（year、seasonType、dayNight 和 homeFinalRuns），而不下载所有数据。我尝试使用reactive() 变量作为目标字符串的过滤器但没有成功，因为我有错误：
Complete
Billed: 0 B
Downloading first chunk of data.
First chunk includes all requested rows.
Listening on http://127.0.0.1:4784
Warning: Error in : Cannot translate a shiny reactive to SQL.
* Force evaluation in R with (e.g.) `!!foo()` or `local(foo())`
70: <Anonymous>
Error : Cannot translate a shiny reactive to SQL.
* Force evaluation in R with (e.g.) `!!foo()` or `local(foo())
我尝试的代码是：
library(shinythemes)
library(dplyr)
library(ggplot2)
library(bigrquery)
library(DBI)
# Open a public BigQuery dataset eg. "baseball"
bq_con <- dbConnect(
bigrquery::bigquery(),
project = "bigquery-public-data",
dataset = "baseball",
billing = "my_project_id"
)
bigrquery::dbListTables(bq_con) # List all the tables in BigQuery data set
# My email google option
1
#[1] "games_post_wide" "games_wide" "schedules"
#
# Selection of target data set
dataset <- dplyr::tbl(bq_con,
"games_wide") # connects to a table
# Selection of reactive strings
dataset_vars <- dataset %>% distinct(year,seasonType,dayNight,homeFinalRuns)%>%
collect()
dataset_vars
# Create the shiny dash
ui <- fluidPage(
theme = shinytheme("cosmo"),
titlePanel(title="My Baseball Dashboard"),
sidebarLayout(
sidebarPanel(
selectInput(inputId = "selectedvariable0",
label = "Year",
choices = c(unique(dataset_vars$year)),selected = TRUE ),
selectInput(inputId = "selectedvariable1",
label = "Season",
choices = c(unique(dataset_vars$seasonType)),selected = TRUE ),
selectInput(inputId = "selectedvariable2",
label = "Period",
choices = c(unique(dataset_vars$dayNight)),selected = TRUE ),
selectInput(inputId = "selectedvariable3",
label = "Final Runs",
choices = c(unique(dataset_vars$homeFinalRuns)),selected = TRUE )
),
mainPanel(
textOutput("idSaida"),
fluidRow(
splitLayout(plotOutput("myplot")))
)
)
)
server <- function(input, output){
currentvariable0 <- reactive({input$selectedvariable0})
currentvariable1 <- reactive({input$selectedvariable1})
currentvariable2 <- reactive({input$selectedvariable2})
currentvariable3 <- reactive({input$selectedvariable3})
# Selection of variables for plots constructions
dataset_sel <- dataset %>% filter(year=currentvariable0(),homeFinalRuns==currentvariable0())%>%
collect()
observe({
if(currentvariable2()=="D"){
output$myplot <- renderPlot({
#Create the plot
ggplot(data=dataset_sel, aes(x=currentvariable0(), y=currentvariable3())) +
geom_bar(stat="identity")
})
} else {
#Create the plot
ggplot(data=dataset_sel, aes(x=currentvariable0(), y=currentvariable3())) +
geom_bar(stat="identity")
}
}) #end of observe function.
}
shinyApp(ui, server)
#
如果我在中使用!!：
# Selection of variables for plots constructions
dataset_sel <- dataset %>% filter(year=!!currentvariable0(),homeFinalRuns==!!currentvariable0())%>%
collect()
发生了一个新错误：
Complete
Billed: 0 B
Downloading first chunk of data.
First chunk includes all requested rows.
Listening on http://127.0.0.1:4784
Warning: Error in : Operation not allowed without an active reactive context.
* You tried to do something that can only be done from inside a reactive consumer.
60: <Anonymous>
Error : Operation not allowed without an active reactive context.
* You tried to do something that can only be done from inside a reactive consumer.
如果我通过以下查询方法进行更改：
var1 <- currentvariable0()
var2 <- currentvariable3()
sqlInput <- paste("SELECT",var1,"as year, 'REG' as seasonType,'N' as dayNight,",var2,"as homeFinalRuns FROM games_wide LIMIT 30")
dataset_sel <- dbGetQuery(bq_con, sqlInput, stringsAsFactors = T)
也不行：
Warning: Error in : Operation not allowed without an active reactive context.
* You tried to do something that can only be done from inside a reactive consumer.
55: <Anonymous>
Error : Operation not allowed without an active reactive context.
* You tried to do something that can only be done from inside a reactive consumer.
请帮忙解决一下？
【问题讨论】：
标签： r shiny google-bigquery bigrquery