R，RPostgreSQL:查询中的向量

Question

使用 RPostgreSQL 包，我必须对string中的vector进行查询：

dbGetQuery(con, "select from id_table where id_user in tmp")

其中tmp应该是长度= 10k的列表或向量，我该怎么做？谢谢。

Answer 1

试试这个：

query = sprintf("select * from id_table where id_user in (%s)", paste("'",tmp, "'",collapse=","))
dbGetQuery(con, query)

希望这有帮助。

Answer 2

您可以使用 paste0。下面是我采用state.abb数据集的示例

valid_state_logic=paste0("(",paste0("'",state.abb,"'", collapse=","),")")
print(valid_state_logic)
[1] "('DC','AL','AK','AZ','AR','CA','CO','CT','DE','FL','GA','HI','ID','IL','IN','IA','KS','KY','LA','ME','MD','MA','MI','MN','MS','MO','MT','NE','NV','NH','NJ','NM','NY','NC','ND','OH','OK','OR','PA','RI','SC','SD','TN','TX','UT','VT','VA','WA','WV','WI','WY')"