How to get dynamic variable in string in r? - r

Question

How can I get the variable name of a function to act dynamically within a string?
Below is an extract of what I am trying to achieve: a function that produces a list depending on the varName. But I cannot get the varName to act dynamically within the string sqldf(...). I assume this problem is not specific to the package sqldf.
createExcelSheetData<-function(varName){
sqldf("
SELECT Name
FROM dataTable
WHERE Choice=varName
")
}
table1<-createExcelSheetData(1)
table2<-createExcelSheetData(2)
table3<-createExcelSheetData(3)
What the above gives me is the choice fixed with the text varName.
UPDATE: To have the variable within the text, not just at the end.
createExcelSheetData<-function(varName){
sqldf("
SELECT Name
FROM dataTable
WHERE Choice=varName
ORDER BY Name
")
}
table1<-createExcelSheetData(1)
table2<-createExcelSheetData(2)
table3<-createExcelSheetData(3)

Answer 1

fn$ is discussed in Example 6 on the sqldf home page. Here is a self contained minimial reproducible example using the iris data frame that comes with R: (In the future please ensure all code is minimal and reproducible and in particular includes all inputs).
library(sqldf)
# retrieve records for specified Species and Petal.Length above minPetalLength
f <- function(Species, minPetalLength) {
fn$sqldf("SELECT *
FROM iris
WHERE Species = '$Species' and [Petal.Length] > $minPetalLength")
}
f("virginica", 6)
giving:
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1 7.6 3.0 6.6 2.1 virginica
2 7.3 2.9 6.3 1.8 virginica
3 7.2 3.6 6.1 2.5 virginica
4 7.7 3.8 6.7 2.2 virginica
5 7.7 2.6 6.9 2.3 virginica
6 7.7 2.8 6.7 2.0 virginica
7 7.4 2.8 6.1 1.9 virginica
8 7.9 3.8 6.4 2.0 virginica
9 7.7 3.0 6.1 2.3 virginica