Struct ColumnOptions 

pub struct ColumnOptions {
    pub limit: Option<usize>,
    pub nullable: bool,
    pub default: Option<String>,
    pub auto_increment: bool,
    pub unique: bool,
    pub comment: Option<String>,
    pub precision: Option<(u32, u32)>,
    pub after: Option<String>,
}

列选项构建器（Phinx 风格链式配置）

Fields

limit: Option<usize>

nullable: bool

default: Option<String>

auto_increment: bool

unique: bool

comment: Option<String>

precision: Option<(u32, u32)>

after: Option<String>

Implementations

impl ColumnOptions

pub fn limit(self, len: usize) -> Self

设置列长度（VARCHAR 长度等）

pub fn not_null(self) -> Self

设置为 NOT NULL（默认是 nullable）

pub fn default_value(self, value: impl Into<String>) -> Self

设置默认值

pub fn auto_increment(self) -> Self

设置为自增主键

pub fn unique(self) -> Self

设置为唯一

pub fn comment(self, comment: impl Into<String>) -> Self

设置列注释

pub fn precision(self, p: u32, s: u32) -> Self

设置 DECIMAL 精度（precision, scale）

pub fn after(self, column: impl Into<String>) -> Self

MySQL AFTER 子句（指定列插入位置）

Trait Implementations

impl Clone for ColumnOptions

fn clone(&self) -> ColumnOptions

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ColumnOptions

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ColumnOptions

fn default() -> Self

Returns the “default value” for a type.