Enum Backend 

pub enum Backend {
    Sqlite(Connection),
    Postgres(Client),
    Duckdb(Connection),
}

An open connection to one of the supported SQL backends. Data values are always passed to execute as Cell parameters (never interpolated).

Variants

Sqlite(Connection)

Postgres(Client)

Duckdb(Connection)

Implementations

impl Backend

pub fn query(&mut self, sql: &str) -> Result<Table>

Run a SELECT and materialize its rows.

pub fn execute(&mut self, sql: &str, params: &[Cell]) -> Result<()>

Run a statement, binding params positionally as data.

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

Positional placeholder for the n-th (1-based) parameter, per driver: ? for SQLite, $n for Postgres.

pub fn real_type(&self) -> &'static str

SQL type keyword for a floating value column in a CREATE TABLE.

Trait Implementations

impl SqlConn for &mut Backend

fn query(&mut self, sql: &str) -> Result<Table>

fn execute(&mut self, sql: &str, params: &[Cell]) -> Result<()>

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

Positional placeholder for the n-th (1-based) parameter.

fn real_type(&self) -> &'static str

SQL type keyword for a floating value column in CREATE TABLE.