Trait NullProbeRow 

pub trait NullProbeRow<Row: ?Sized>: FromDrizzleRow<Row> {
    // Required method
    fn is_null_at(row: &Row, offset: usize) -> Result<bool, DrizzleError>;
}

Trait for composite (multi-column) row types that support NULL probing.

Implementing this trait enables Option<T> to work as a FromDrizzleRow target, used for LEFT JOIN results where the joined table may be absent (all columns NULL).

Proc macros generate this for each SelectModel. Leaf types (i32, String, etc.) use concrete Option<T> impls instead.

Required Methods

fn is_null_at(row: &Row, offset: usize) -> Result<bool, DrizzleError>

Returns true if the first column at offset is NULL.

Errors

Returns an error if the row cannot be inspected at offset (e.g. the driver reports an out-of-range index or conversion failure).

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors