Struct Cql 

pub struct Cql;

Cassandra Query Language dialect, used by ScyllaEngine and the Cassandra driver. CQL overlaps with SQL for the basic SELECT/INSERT/UPDATE/DELETE ... WHERE shapes the Client API emits, but diverges on many details: no RETURNING, no cross-partition joins, no traditional ON CONFLICT (use IF NOT EXISTS LWT instead), no transactions, and ? positional placeholders only. The CQL dialect emits that subset safely; engine-level compensation covers the RETURNING gap the way MySQL does.

Trait Implementations

impl SqlDialect for Cql

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

Emit the 1-indexed parameter placeholder for position i.

fn returning_clause(&self, _cols: &str) -> String

Emit the clause (leading space included) that requests the given columns be returned after an INSERT/UPDATE/DELETE. Postgres/SQLite/MySQL emit RETURNING cols; MSSQL emits OUTPUT INSERTED.cols.

fn insert_has_returning(&self) -> bool

Whether an INSERT statement can use the dialect’s returning clause to retrieve inserted rows in-place.

fn quote_ident(&self, i: &str) -> String

Quote a table/column identifier for safe interpolation.

fn upsert_clause(&self, _c: &[&str], _s: &str) -> String

Emit the ON CONFLICT / ON DUPLICATE KEY clause (leading space included) that converts an INSERT into an upsert.

fn supports_distinct_on(&self) -> bool

Whether the dialect supports SELECT DISTINCT ON (cols) (Postgres-only among our backends today).

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

SQL keyword that begins a transaction. Defaults to BEGIN.

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

SQL keyword that commits a transaction. Defaults to COMMIT.

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

SQL keyword that rolls back a transaction. Defaults to ROLLBACK.