Question

我在下面有一个SQL查询，可以正常工作。

 Select * from dbo.Employee where StartDate between '08/01/2014' and '08/31/2014' order by StartDate

我正在修改此查询，以便从闪亮的UI（日期范围）中输入日期。

sqlQuery(myconn, paste("Select * from dbo.Employee where StartTime between", "'as.character(input$daterange[1])'", "and", "'as.character(input$daterange[2])'", "order by StartTime"))

我收到错误

[1,] "22007 241 [Microsoft][SQL Server Native Client 10.0][SQL Server]Conversion failed when converting date and/or time from character string."
[,2] "[RODBC] ERROR: Could not SQLExecDirect ' Select * from.....                                                 Where StartDate between 'as.character(input$daterange[1])' and 'as.character(input$daterange[2])' order by StartDate '"

不确定如何修复此查询，以便从闪亮的UI中输入日期，需要帮助。

Answer 1

我使用sub函数来做到这一点，只需使用如下的正则表达式：

my_date1 <- "08/01/2014"
my_date2 <- "08/31/2014"

my_query <- 'Select * from dbo.Employee where StartDate between DATE1 and DATE2 order by StartDate'
my_query <- sub("DATE1",my_date1,my_query);my_query <- sub("DATE2",my_date2,my_query)
# the result of your query is below
noquote(my_query)

# if you want the quotes for dates leave them there
my_query <- 'Select * from dbo.Employee where StartDate between "DATE1" and "DATE2" order by StartDate'
my_query <- sub("DATE1",my_date1,my_query);my_query <- sub("DATE2",my_date2,my_query)
# the result of your query is below
noquote(my_query)


# Now sub the inputs into those variables like so
my_query <- 'Select * from dbo.Employee where StartDate between DATE1 and DATE2 order by StartDate'
my_query <- sub("DATE1",input$daterange[1],my_query);my_query <- sub("DATE2",input$daterange[2],my_query)
noquote(my_query)

r闪亮的日期范围输入到sql查询

1 个答案: