Struct SubstrFunc 

pub struct SubstrFunc;

Trait Implementations

impl ScalarFunction for SubstrFunc

fn invoke(&self, args: &[SqliteValue]) -> Result<SqliteValue>

Execute this function on the given arguments.

fn num_args(&self) -> i32

The number of arguments this function accepts.

fn min_args(&self) -> i32

Minimum accepted argument count for variadic functions.

fn max_args(&self) -> Option<i32>

Maximum accepted argument count, or None for unbounded variadic functions.

fn name(&self) -> &str

The function name, used in error messages and EXPLAIN output.

fn is_deterministic(&self) -> bool

Whether this function is deterministic (same inputs → same output).

fn accepts_arg_count(&self, num_args: i32) -> bool

Return whether this function accepts num_args arguments.