Question

我想在postgresql数据库中添加之前计算的实际值

Imp1=5/4
req=paste("INSERT INTO important (num_cluster,type,indicateur_imp) VALUES (1,'temperature',Imp1)")
resultat=dbGetQuery(con,req)

错误

Error in postgresqlExecStatement(conn, statement, ...) : 
  RS-DBI driver: (could not Retrieve the result : ERREUR:  la colonne Â« imp1 Â» n'existe pas
LINE 1: ...m_cluster,type,indicateur_imp) VALUES (1,'temperature',Imp1)
                                                                  ^
)
Warning message:
In postgresqlQuickSQL(conn, statement, ...) :
  Could not create executeINSERT INTO important (num_cluster,type,indicateur_imp) VALUES (1,'temperature',Imp1)

Answer 1

我认为应该给你你想要的东西：

Imp1 <- 32.1
req  <- paste("INSERT INTO important (num_cluster,type,indicateur_imp) 
VALUES (1,'temperature',",Imp1, ")",sep="")

那将输出：

[1]＆＃34; INSERT INTO important（num_cluster，type，indicationur_imp）VALUES（1，＆＃39; temperature＆＃39;，32.1）＆＃34;

paste()将获取任何变量并将其值作为字符串返回，并将项目与逗号链接在一起。您可以使用sep=参数结束语句。要成为最文字的（我喜欢为查询做）我只使用sep = ""并按字面输入整个事物。所以如果我想要插入多个值，我会做这样的事情：

var1 <- round(rnorm(5))
var2 <- c("'temp'","'pressure'","'precip'","'volume'","'mass'")
for(i in 1:length(var1)){
req <- paste("INSERT INTO important (num_cluster,type,indicateur_imp) VALUES   
(1,",var2[i],",",var1[i],")",sep="")
# not run, but do to send your query 
# dbSendQuery(conn,req)
print(req)
}

这将发送以下查询：

[1]＆＃34; INSERT INTO important（num_cluster，type，indicationur_imp）VALUES（1，＆＃39; temp＆＃39;，0.09）＆＃34;

[1]＆＃34; INSERT INTO重要（num_cluster，type，indicationur_imp）VALUES（1，＆＃39;压力＆＃39;，0.04）＆＃34;

[1]＆＃34; INSERT INTO important（num_cluster，type，indicationur_imp）VALUES（1，＆＃39; degra＆＃39;， - 1.2）＆＃34;

[1]＆＃34; INSERT INTO important（num_cluster，type，indicationur_imp）VALUES（1，＆＃39; volume＆＃39;，0.78）＆＃34;

[1]＆＃34; INSERT INTO important（num_cluster，type，indicationur_imp）VALUES（1，＆＃39; mass＆＃39;，1.15）＆＃34;

用R查询语句“insert into”

1 个答案: