138 lines
3.6 KiB
Rust
138 lines
3.6 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 std::fmt;
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#[cfg(feature = "postgres")]
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mod postgres;
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#[cfg(feature = "sqlite")]
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mod sqlite;
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#[cfg(feature = "mysql")]
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mod mysql;
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#[cfg(feature = "mssql")]
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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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struct DriverBase {
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escape_char_open: char,
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escape_char_close: char,
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has_truncate: bool,
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}
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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<String>) -> 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 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 mut trimmed_hiers: Vec<String> = vec![];
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for hier in identifier.split(".") {
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let mut hier = &mut hier.trim();
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if hier.starts_with(open_char) && hier.ends_with(close_char) {
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trimmed_hiers.push(hier.to_string());
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} else {
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let mut hier = format!("{}{}{}", open_char, hier, close_char);
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trimmed_hiers.push(hier.to_string());
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}
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}
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trimmed_hiers.join(".")
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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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#[derive(Debug)]
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struct TestDriver;
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impl DatabaseDriver for TestDriver {
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fn query(&self, _query: &str) -> Result<(), ()> {
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Ok(())
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}
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}
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#[test]
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fn test_quote_identifier() {
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let driver = TestDriver {};
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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 = TestDriver {};
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assert_eq!(
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driver.quote_identifiers(vec![
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"\tfoo. bar".to_string(),
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"baz".to_string(),
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"fizz.\n\tbuzz.baz".to_string(),
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]),
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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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