本文介绍了将SQL输入日期范围传递到SHINY中的查询中的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在学习使用闪亮的仪表板，并使用SQL数据库SQL服务器，我希望在其中直接从数据库中提取数据。其基本思想是合并到表中具有日期范围的起始点和终止点的列，将它们制表，然后用图表表示它们。
我发现以下帖子是关于如何将SQL输入语句传递到SHILY中的： How to pass input variable to SQL statement in R shiny?
不幸的是，当我尝试并应用这一点时，我收到一个错误：下标超出范围；看起来查询没有被拉入。我已经单独测试了它，并且能够拉出数据并运行每一步，没有问题。我正在使用RODBC包，我想知道这是否是问题所在。以下是我的代码：
library(stringr)
library(RODBC)
library(circlize)
library(shinydashboard)
library(shiny)
ui <- dashboardPage(skin = "blue",
dashboardHeader(title = "sample"),
dashboardSidebar(disable = TRUE),
dashboardBody(
# Boxes need to be put in a row (or column)
fluidRow(
box(title = "Route Volume", background = "green", solidHeader = TRUE,
plotOutput(outputId= 'plot2'))),
fluidRow(
box(background= "green", dateRangeInput("dates", label = h3("Date Range"),start = '2016-06-01',
end = '2016-06-05')), width = 4
))))
server <- function(input, output) {
database = odbcConnect("datatbase")
output$plot2 = renderPlot({
d = paste0("SELECT
top 30
convert(char(10),datetime,121) as date,
cast(start_destination as varchar(3))
+ (',') + cast(final_destination as varchar(3)) as combo,
count(cast(start_destination as varchar(3))
+ (',') + cast(final_destination as varchar(3))) as volume
FROM
trips
WHERE datetime >= ",input$dates[1]," AND
datetime < ",input$dates[2],"
GROUP BY
cast(start_destination as varchar(3))
+ (',') + cast(final_destination as varchar(3)),
convert(char(10),datetime,121);")
sql = sqlQuery(database, d)
sql = data.frame(sql, do.call(rbind, str_split(sql$combo, ',')))
colnames(sql)[colnames(sql)=="X1"] <- "From"
colnames(sql)[colnames(sql)=="X2"] <- "To"
sql = sql[,c(4,5,3)]
sql = sql[order(sql$volume, decreasing = T),]
chordDiagram(sql)
circos.clear()
})
}
shinyApp(ui, server)
我确信这是一些愚蠢的错误、一个漏掉的引号或我对如何应用这些技术的误解。感谢您的帮助！！
##adding edits by Dean to test
database = odbcConnect("database")
output$plot2 = renderPlot({
if(input$dates[1]!= "") {
d = paste0("SELECT
top 30
convert(char(10),datetime,121) as date,
cast(start_destination as varchar(3))
+ (',') + cast(final_destination as varchar(3)) as combo,
count(cast(start_destination as varchar(3))
+ (',') + cast(final_destination as varchar(3))) as volume
FROM
trips
WHERE
datetime >= ",input$dates[1]," AND
datetime < ",input$dates[2],"
GROUP BY
cast(start_destination as varchar(3))
+ (',') + cast(final_destination as varchar(3)),
convert(char(10),datetime,121);")
sql = sqlQuery(database, d)
#i assumed the if statement ended here so I put the
#bracket below
sql = data.frame(sql, do.call(rbind, str_split(sql$combo, ',')))
colnames(sql)[colnames(sql)=="X1"] <- "From"
colnames(sql)[colnames(sql)=="X2"] <- "To"
sql = sql[,c(4,5,3)]
sql = sql[order(sql$volume, decreasing = T),]
chordDiagram(sql)
circos.clear()
}
})
}
database = odbcConnect("database")
output$plot2 = renderPlot({
dates = as.Date(input$dates)
d = paste0("SELECT
top 30
convert(char(10),datetime,121) as date,
cast(start_destination as varchar(3))
+ (',') + cast(final_destination as varchar(3)) as combo,
count(cast(start_destination as varchar(3))
+ (',') + cast(final_destination as varchar(3))) as volume
FROM
trips
WHERE
datetime >= {d '",input$dates[1],"'} AND
datetime < {d '",input$dates[2],"'}
GROUP BY
cast(start_destination as varchar(3))
+ (',') + cast(final_destination as varchar(3)),
convert(char(10),datetime,121);")
sql = sqlQuery(database, d)
sql = data.frame(sql, do.call(rbind, str_split(sql$combo, ',')))
colnames(sql)[colnames(sql)=="X1"] <- "From"
colnames(sql)[colnames(sql)=="X2"] <- "To"
sql = sql[,c(4,5,3)]
sql = sql[order(sql$volume, decreasing = T),]
chordDiagram(sql)
circos.clear()
})
}
推荐答案
#它需要你们所有人的两个建议的组合，确保打印日期并进行转换。谢谢大家！下面是工作代码 server <- function(input, output) {
output$plot2 = renderPlot({
database = odbcConnect("database")
start_date = print(input$dates[1])
end_date = print(input$dates[2])
my_query="SELECT
top 30
convert(char(10),datetime,121) as date,
cast(start_destination as varchar(3))
+ (',') + cast(final_destination as varchar(3)) as combo,
count(cast(start_destination as varchar(3))
+ (',') + cast(final_destination as varchar(3))) as volume
FROM
trips
WHERE
datetime >= DATE1 AND
datetime < DATE2
GROUP BY
cast(start_destination as varchar(3))
+ (',') + cast(final_destination as varchar(3)),
convert(char(10),datetime,121);"
my_query <- sub("DATE1",as.Date(start_date),my_query);
my_query <- sub("DATE2",as.Date(end_date),my_query)
sql = sqlQuery(database, paste(my_query))
sql = data.frame(sql, do.call(rbind, str_split(sql$combo, ',')))
colnames(sql)[colnames(sql)=="X1"] <- "From"
colnames(sql)[colnames(sql)=="X2"] <- "To"
sql = sql[,c(4,5,3)]
sql = sql[order(sql$volume, decreasing = T),]
chordDiagram(sql)
circos.clear()
})
}
shinyApp(ui, server)
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