Module types 

Available on (crate features mysql or sqlite or postgres or mssql or odbc) and crate feature any only.

Conversions between Rust and standard SQL types.

Types

Rust type	SQL type(s)
bool	BOOLEAN
i16	SMALLINT
i32	INT
i64	BIGINT
f32	FLOAT
f64	DOUBLE
&str, String	VARCHAR, CHAR, TEXT

Nullable

In addition, Option<T> is supported where T implements Type. An Option<T> represents a potentially NULL value from SQL.