R Shiny - 无法找到函数'dbGetQuery'的继承方法

Question

为什么我会在下面继续收到此错误，

  

无法为函数'dbGetQuery'找到继承的方法   签名'“SQLiteConnection”，“data.frame”'

有，

  # Fetch all site names.
  siteQuery <- dbGetQuery(DB, "SELECT nid, title, description 
                     FROM nodes 
                     WHERE datatype = 'speck' 
                     AND visible = '1'
                     AND nid = 'SITE'
                     ")

  # Match the pattern and replace it.
  siteQuery <- sub("SITE", as.character(site1), siteQuery)

  # Store the result in data.
  siteData = dbGetQuery(DB, siteQuery)

我的sqlite查询或R脚本中出错了吗？我有什么想法可以解决这个问题吗？

Answer 1

  # Fetch a site.
  siteQuery <- "SELECT nid, title, description 
            FROM nodes 
            WHERE datatype = 'speck' 
            AND visible = '1'
            AND nid = 'SITE'
            "

  # Match the pattern and replace it.
  siteQuery <- sub("SITE", as.character(site1), siteQuery)

  # Store the result in data.
  siteData = dbGetQuery(DB, siteQuery)