Enum Dialect 

pub enum Dialect {
    Postgres,
    Mysql,
    Sqlite,
}

数据库方言枚举

封装不同数据库的 SQL 语法差异，如参数占位符风格和标识符引号。

Variants

Postgres

PostgreSQL（参数：$1，引号：""）

Mysql

MySQL（参数：?，引号：` `）

Sqlite

SQLite（参数：?，引号：""）

Implementations

impl Dialect

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

参数占位符风格

pub fn quote(&self, ident: &str) -> String

引用标识符（表名/列名）

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