drizzle_core/
dialect.rs

1//! Dialect type re-exported from drizzle-types with core-specific extensions.
2
3use crate::prelude::*;
4
5/// Re-export the unified Dialect enum from drizzle-types
6pub use drizzle_types::Dialect;
7
8/// Extension trait for Dialect-specific placeholder rendering
9pub trait DialectExt {
10    /// Renders a placeholder for this dialect with the given 1-based index.
11    ///
12    /// Returns `Cow::Borrowed("?")` for SQLite/MySQL (zero allocation),
13    /// `Cow::Owned` for PostgreSQL numbered placeholders.
14    ///
15    /// # Examples
16    /// - PostgreSQL: `$1`, `$2`, `$3`
17    /// - SQLite/MySQL: `?`
18    fn render_placeholder(&self, index: usize) -> Cow<'static, str>;
19
20    /// Appends a placeholder directly into an output buffer.
21    #[inline]
22    fn write_placeholder(&self, index: usize, out: &mut String) {
23        match self.render_placeholder(index) {
24            Cow::Borrowed(v) => out.push_str(v),
25            Cow::Owned(v) => out.push_str(&v),
26        }
27    }
28}
29
30impl DialectExt for Dialect {
31    #[inline]
32    fn render_placeholder(&self, index: usize) -> Cow<'static, str> {
33        match self {
34            Dialect::PostgreSQL => Cow::Owned(format!("${}", index)),
35            Dialect::SQLite | Dialect::MySQL => Cow::Borrowed("?"),
36        }
37    }
38}
drizzle_core/dialect.rs

drizzle_core/
dialect.rs
