將多個參數傳遞給dbGetQuery（）？像運營商

Question

我是R編碼新手。我有個問題。

Df <- dbGetQuery(con, "SELECT * FROM EMP WHERE ename like '%raju%'") 

我想要一個更加動態的代碼段。當有多個名字，如deepak，鐳，raghu等

Answer 1

考慮與paste0動態連接。外paste0是爲封裝與所需的報價和LIKE運營商較大的字符串：

likevars = paste0("LIKE '%", paste0(c("deepak", "ravi", "ragh"), 
            collapse="%' OR ename LIKE '%"), "%'") 

Df <- dbGetQuery(con, sprintf("SELECT * FROM EMP WHERE ename %s", likevars)) 

# SELECT * FROM EMP WHERE ename LIKE '%deepak%' OR ename LIKE '%ravi%' OR ename LIKE '%ragh%'