如何使用R将列表放在db中

时间:2014-04-18 01:35:05

标签: mysql sql r

我不知道我的问题是否能代表我的需要

我有这段代码:

i<-0 j<-0

for(i in 0:m){   j<- j+1   neighborhood <- fn$sqldf("SELECT object2
  FROM distance WHERE object1=('$j') AND neighbor=TRUE UNION SELECT
  object1 FROM distance WHERE object2=('$j') AND neighbor=TRUE ")

for (neighbor in neighborhood){
  fn$sqldf(" INSERT INTO neighborhoods(object,neighborhood) 
             VALUES ('$neighbor','$neighbor')")

邻域的结果是(8,10,11)

我想在表邻居中获得结果,如:

(1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, 8.10, 8.11, 9.9,

但我总是在postgresqlExecStatement(conn,statement,...)中得到此错误:

  

RS-DBI驱动程序:(无法检索结果:错误:整数的输入语法无效:“c(8,10,11)”   第1行:......到邻里(对象,邻居)价值观('8','c(8,10,...                                                                ^   )

我发现,如何通过像这样的循环得到我想要的结果

  

i&lt; - 0 j&lt; - 1 for(i in 0:m){core&lt; - fn $ sqldf(“SELECT core   FROM core_point WHERE gid =('$ j')“)if(core = FALSE){
               fn $ sqldf(“插入邻域(对象,邻域)值('$ j','$ j'”)j&lt; -j + 1} if(core == TRUE){               邻域&lt; - fn $ sqldf(“SELECT object2 FROM distance WHERE object1 =('$ j')AND neighbor = TRUE UNION SELECT object1 FROM   距离WHERE object2 =('$ j')AND neighbor = TRUE“)

 a <-fn$sqldf("select totalneighborhoods from core_point where gid='$j'")
 a <- as.numeric(a)
 for(k in 1:a){
   o<- neighborhood[k,1]          
   fn$sqldf(" INSERT INTO neighborhoods(object,neighborhood) VALUES ('$j','$o')")
   k<- k+1
 }
 j<- j+1   } }

但我认为它会获得这个过程,任何想法? *对不起,如果我的英语不好

1 个答案:

答案 0 :(得分:0)

试试这个:

a <- 8
b <- c(8,9,10)

paste(a,b,sep=".")  # If you need string output

as.numeric(paste(a,b,sep="."))   # If you need numeric output