我想在dbGetquery()中将文本输入作为查询的一部分。它以普通的R脚本显示结果,但在renderTable()中显示错误。
library(flexdashboard)
suppressWarnings(library(ROracle, quietly = TRUE))
library(shiny)
Column {data-width=350}
-----------------------------------------------------------------------
textInput(inputId = 'Col', label = 'COL', value = "")
actionButton('submit', 'Submit', icon = icon('refresh'))
Column {data-width=650}
-----------------------------------------------------------------------
session <- observeEvent(input$submit, {
etf_con<- dbConnect(drv, username = load.schema.username, password = load.schema.password, dbname = load.schema.database)
t <- dbGetQuery(etf_con, paste0("select * from table_name where col = '", input$Col, "'"))
})
renderTable({
t
})
第二栏中的错误是:
无法将类“功能”强制转换为data.frame
我还尝试过删除observeEvent
并仅拥有renderTable
。像这样:
renderTable({
etf_con<- dbConnect(drv, username = load.schema.username, password = load.schema.password, dbname = load.schema.database)
dbGetQuery(etf_con, paste0("select * from table_name where col = '", input$Col, "'"))
})
当我点击“运行文档”时,列名称显示在右列中。输入文本后,出现错误:
二进制运算符的非数字参数
答案 0 :(得分:0)
似乎我需要一个占位符作为反应值,因此我只添加了v <- reactiveValues(t = NULL)
并将t
用作列表v
中的元素之一。这是链接http://shiny.rstudio.com/articles/action-buttons.html。我使用了模式3。
library(flexdashboard)
suppressWarnings(library(ROracle, quietly = TRUE))
library(shiny)
Column {data-width=350}
-----------------------------------------------------------------------
textInput(inputId = 'Col', label = 'COL', value = "")
actionButton('submit', 'Submit', icon = icon('refresh'))
Column {data-width=650}
-----------------------------------------------------------------------
v <- reactiveValues(t = NULL)
observeEvent(input$submit, {
etf_con<- dbConnect(drv, username = load.schema.username, password = load.schema.password, dbname = load.schema.database)
v$t <- dbGetQuery(etf_con, paste0("select * from table_name where col = '", input$Col, "'"))
})
renderTable({
v$t
})