passing array as parameter in sqlite Swift - swift

Question

I implemented Sqlite in my project by adding #import <sqlite3.h> in my header.h file and libsqlite3.dylib.
How can I pass an array as parameter to my query, here is what I thought:
var arrayId = [1,2] // array with interested Id
var query:NSString = "Select id from Product where id IN \(arrayId)" // I want to select Products with id that are in the array
Edit:
Does it change if arrayId is NSArray ? Because I also need arrayId as NSArray.
then I proceed with open sqlite database, prepare query and so on.
Thank you in advance.

Answer 1

You can easily combine the array into a string with join function.
var arrayId = [1,2] // array with interested Id
var inExpression = ",".join(map(arrayId) { "\($0)"})
// inExpression = "1,2"
var query = "Select id from Product where id IN (\(inExpression))"

Answer 2

Update for Swift3:
var arrayId = [1,2] // array with interested Id
var inExpression = arrayId.flatMap{ String($0) }.joined(separator: ",")
// inExpression = "1,2"
var query = "SELECT id FROM Product WHERE id IN (\(inExpression))"

Answer 3

You need to accomplish two things: convert your array of Ints to Strings and then implode the array into a string, by joining them with commas (as you would want to do with an IN SQL statement).
Here's a rudimentary function that does just that:
func implode(ints: [Int]) -> String {
// Convert to Strings
let strs = ints.map { String($0) }
// Join Strings with commas
return ",".join(strs)
}
And then in use:
"WHERE id IN (\(implode(arrayId)))"

Answer 4

I'd probably use something like:
var arrayId = [1,2] // array with interested Id
var str = ",".join(arrayId.map { return "\($0)" })
var query = "SELECT id FROM Product WHERE id IN [\(str)]"

Answer 5

Using Swift's own string interpolation to create SQL statements can be risky (as with any language). The sqlite3 library provides parameter binding for this purpose:
if (statement.prepare("SELECT name FROM products WHERE id = ?") != .Ok) {
// Deal with error here
}
// Bind the question mark to your value
statement.bindInt(1, value: 8766)
if (statement.step() == .Row) {
let name = statement.getStringAt(1)
// ...do something with your data from the statement
}
// Done.
statement.finalizeStatement()
EDIT:
For the comment below, you need () brackets, not []:
select id, body from test where id in (1,2);
not
select id, body from test where id in [1,2];