Enum Dialect 

pub enum Dialect {
    Postgres,
    Mysql,
    Sqlite,
}

Target database dialect for placeholder syntax.

Variants

Postgres

PostgreSQL: $1, $2, $3

Mysql

MySQL: ?, ?, ?

Sqlite

SQLite: ?1, ?2, ?3

Implementations

impl Dialect

pub fn placeholder(&self, index: usize) -> String

Format a placeholder for the given 1-based parameter index.

pub fn supports_numbered_placeholders(&self) -> bool

Whether this dialect uses numbered placeholders ($1, ?1) vs positional (?).

Numbered dialects (Postgres, SQLite) support alphabetical parameter ordering and deduplication. Positional dialects (MySQL) use document-order placeholders.

Trait Implementations

impl Clone for Dialect

fn clone(&self) -> Dialect

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Dialect

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Dialect

fn eq(&self, other: &Dialect) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Dialect

impl Eq for Dialect

impl StructuralPartialEq for Dialect