diesel::print_sql!

macro_rules! print_sql {
    ($query:expr) => { ... };
}

Takes takes a query QueryFragment expression as an argument and prints out the SQL with placeholders for the dynamic values.

Example

Printing SQL from a count statment:

```rust

// example requires setup for users table

use diesel::users::dsl::*;

use diesel::query_builder::QueryFragment;

fn main() {

print_sql!(users.count());

}

```