我正在尝试根据我最近完成的一些定性数据分析来创建一些动态输出。我需要用户在 Shiny 中进行选择。基于此,我需要使用 SQLite 在 RQDA 中运行查询。
我看过多个关于在 Shiny 中重新激活输入的视频,但我尝试应用的所有内容都没有奏效。我尝试使用 paste() 和 paste0() 为我的查询创建 SQLite 命令的文本块,但闪亮不会让我运行它。
界面代码
library(shiny)
library(igraph)
library(sqldf)
library(RQDA)
library(DBI)
# Open the project
openProject("C:/SWOT Analysis/Qual Analysis of SWOTs.rqda")
# Get the table required for inputs
db <- dbConnect(SQLite(), dbname="Qual Analysis of SWOTs.rqda")
# Read in the inputs
codeCat <- dbReadTable(db, "codecat")[which(dbReadTable(db,"codecat")$status==1),c(3,1)]
# Set to a vector format for shiny
codeCat1 <- setNames(codeCat$catid, codeCat$name)
ui <- fluidPage(
tabsetPanel(
tabPanel(title = "2 Categories",
tags$h1("Compare two coded categories"),
wellPanel(selectInput(inputId = "Opt1",
label = "Select the first category",
choices = codeCat1,
selected = codeCat1[1]),
selectInput(inputId = "Opt2",
label = "Select the second category",
choices = codeCat1,
selected = codeCat1[2])),
textOutput(outputId = "cat2"),
plotOutput(outputId = "pcat2"),
tableOutput(outputId = "tbl")
)))
服务器代码
server <- function(input, output, session){
output$cat2 <- renderText({paste(input$Opt1, "and", input$Opt2, "have been selected.")})
a <- renderText({paste("SELECT codecat.name, freecode.name FROM codecat, freecode, treecode WHERE codecat.catid=treecode.catid AND freecode.id=treecode.cid AND treecode.status=1 and treecode.catid = ", input$Opt1, "or codecat.catid=treecode.catid AND freecode.id=treecode.cid AND
treecode.status=1 and treecode.catid = ", input$Opt2)})
# testing to see if the RQDA query works - this did
output$tbl <-renderTable({RQDAQuery(paste("SELECT codecat.name, freecode.name FROM codecat, freecode, treecode WHERE codecat.catid=treecode.catid AND freecode.id=treecode.cid AND treecode.status=1 and treecode.catid = ", input$Opt1, "or codecat.catid=treecode.catid AND freecode.id=treecode.cid AND
treecode.status=1 and treecode.catid = ", input$Opt2))})
# this will be used for plotting after doing clusters later
# edges <- RQDAQuery(a())
on.exit(DBI::dbDisconnect(db))
}
警告:.getReactiveEnvironment()$currentContext 中的错误:如果没有活动的反应上下文,则不允许操作。(您试图做一些只能从反应式表达式或观察者内部完成的事情。)这是我得到的错误消息 - 我知道我做的事情显然是错误的,但我似乎看不到它!