diesel::debug_sql!

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

Takes a query QueryFragment expression as an argument and returns a string of SQL with placeholders for the dynamic values.

Example

Returning SQL from a count statment:

```rust

// example requires setup for users table

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

use diesel::query_builder::QueryFragment;

fn main() {

let sql = debug_sql!(users.count()); assert_eq!(sql, "SELECT COUNT(*) FROM users");

}

```