//! Drivers
//!
//! Drivers represent a connection to a specific type of database engine
use std::fmt;

#[cfg(feature = "postgres")]
mod postgres;

#[cfg(feature = "sqlite")]
mod sqlite;

#[cfg(feature = "mysql")]
mod mysql;

#[derive(Debug)]
struct Connection;

/// Result for a db query
#[derive(Debug)]
struct QueryResult;

struct DriverBase {
    escape_char_open: char,
    escape_char_close: char,
    has_truncate: bool,
}

/// Database Driver Trait
///
/// Interface between the database connection library and the query builder
pub trait DatabaseDriver: fmt::Debug {
    /// Vector version of `quote_identifier`
    fn quote_identifiers(&self, identifiers: Vec<String>) -> Vec<String> {
        let mut output: Vec<String> = vec![];

        for identifier in identifiers {
            output.push(self.quote_identifier(&identifier));
        }

        output
    }

    /// Quote the identifiers passed, so the database does not
    /// normalize the identifiers (eg, table, column, etc.)
    fn quote_identifier(&self, identifier: &str) -> String;

    /// Runs a basic sql query on the database
    fn query(&self, query: &str) -> Result<(), ()>;
}