Struct Column 

pub struct Column { /* private fields */ }

A column to add, described portably (the dialect-specific type rendering is deferred to apply time, exactly as crate::schema does for CREATE).

New columns default to nullable: adding a NOT NULL column to a table that already has rows fails unless a default backfills them, so call not_null together with default.

Implementations

impl Column

pub fn new(name: impl Into<String>, ty: ColumnType) -> Self

A nullable column of ty.

pub fn not_null(self) -> Self

Mark the column NOT NULL. Pair with default when the table may already hold rows.

pub fn null(self) -> Self

Mark the column nullable (the default).

pub fn default(self, value: impl Into<Value>) -> Self

A column default — also backfills existing rows when adding NOT NULL.

pub fn keyed(self) -> Self

Hint that this (text) column will be indexed, so it renders as a bounded VARCHAR rather than TEXT on MySQL (which can’t index an unbounded TEXT). No effect on SQLite/D1, where both are TEXT affinity.