将多个参数传递给dbGetQuery（）？像运营商

Question

我是R编码新手。我有个问题。

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

我想要一个更加动态的代码段。当有多个名字，如deepak，镭，raghu等

Answer 1

考虑与paste0动态连接。外paste0是为封装与所需的报价和LIKE运营商较大的字符串：

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%'