137 lines
3.5 KiB
Rust
137 lines
3.5 KiB
Rust
//! Drivers
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//!
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//! Drivers represent a connection to a specific type of database engine
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use crate::split_join_map;
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use std::fmt;
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#[cfg(feature = "postgres")]
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pub mod postgres;
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#[cfg(feature = "sqlite")]
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pub mod sqlite;
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#[cfg(feature = "mysql")]
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pub mod mysql;
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#[cfg(feature = "mssql")]
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pub mod mssql;
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#[derive(Debug)]
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struct Connection;
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/// Result for a db query
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#[derive(Debug)]
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struct QueryResult;
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/// Empty Driver implementation
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///
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/// Good for general testing
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#[derive(Debug)]
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pub struct DefaultDriver;
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impl DefaultDriver {
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pub fn new() -> Self {
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DefaultDriver {}
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}
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}
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impl DatabaseDriver for DefaultDriver {}
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/// Database Driver Trait
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///
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/// Interface between the database connection library and the query builder
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pub trait DatabaseDriver: fmt::Debug {
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/// Get which characters are used to delimit identifiers
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/// such as tables, and columns
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fn _quotes(&self) -> (char, char) {
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('"', '"')
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}
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/// Vector version of `quote_identifier`
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fn quote_identifiers(&self, identifiers: Vec<&str>) -> Vec<String> {
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let mut output: Vec<String> = vec![];
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for identifier in identifiers {
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output.push(self.quote_identifier(identifier).to_string());
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}
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output
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}
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/// Quote the identifiers passed, so the database does not
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/// normalize the identifiers (eg, table, column, etc.)
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fn quote_identifier(&self, identifier: &str) -> String {
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let mut identifier = &mut String::from(identifier);
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// If the identifier is actually a comma-separated list,
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// recurse to quote each identifier in the list
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if identifier.contains(",") {
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let mut quoted_parts: Vec<String> = vec![];
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for part in identifier.split(",") {
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let new_part = part.trim();
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let new_part = &self.quote_identifier(new_part);
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quoted_parts.push(new_part.to_owned());
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}
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// This was the only way I could figure to get
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// around mutable string reference scope hell
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identifier.replace_range(.., &mut quoted_parts.join(","));
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}
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let (open_char, close_char) = self._quotes();
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let trimmed_tiers = split_join_map(identifier, ".", |tier| {
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let tier = tier.trim();
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// Here where the quoting actually happens. Everything
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// else is breaking down the identifier list for this.
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if tier.starts_with(open_char) && tier.ends_with(close_char) {
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return tier.to_string();
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}
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format!("{}{}{}", &open_char, tier, &close_char)
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});
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trimmed_tiers
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// @TODO Fix functional calls in 'select' queries
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}
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// Runs a basic sql query on the database
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// fn query(&self, query: &str) -> Result<(), ()>;
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_quote_identifier() {
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let driver = DefaultDriver::new();
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assert_eq!(
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driver.quote_identifier("foo, bar, baz"),
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r#""foo","bar","baz""#
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);
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assert_eq!(
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driver.quote_identifier("foo.bar, baz, fizz"),
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r#""foo"."bar","baz","fizz""#
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);
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}
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#[test]
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fn test_quote_identifiers() {
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let driver = DefaultDriver::new();
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assert_eq!(
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driver.quote_identifiers(vec!["\tfoo. bar", "baz", "fizz.\n\tbuzz.baz",]),
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vec![
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r#""foo"."bar""#.to_string(),
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r#""baz""#.to_string(),
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r#""fizz"."buzz"."baz""#.to_string(),
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]
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);
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}
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}
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