Struct ColumnDef 

pub struct ColumnDef {
    pub name: String,
    pub col_type: String,
    pub length: Option<usize>,
    pub precision: Option<(u32, u32)>,
    pub nullable: bool,
    pub default: Option<String>,
    pub auto_increment: bool,
    pub unique: bool,
    pub comment: Option<String>,
}

列定义

Fields

name: String

列名

col_type: String

列类型

length: Option<usize>

长度（如 VARCHAR(255)）

precision: Option<(u32, u32)>

精度与小数位（如 DECIMAL(10,2)）

nullable: bool

是否允许 NULL

default: Option<String>

默认值表达式

auto_increment: bool

是否自增

unique: bool

是否唯一

comment: Option<String>

列注释

Implementations

impl ColumnDef

pub fn new(name: &str, col_type: &str) -> Self

创建列定义，指定列名和类型

pub fn not_null(self) -> Self

设置 NOT NULL

pub fn default(self, value: &str) -> Self

设置默认值

pub fn auto_increment(self) -> Self

设置自增

pub fn unique(self) -> Self

设置唯一约束

pub fn comment(self, comment: &str) -> Self

设置列注释

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

设置列长度

Trait Implementations

impl Clone for ColumnDef

fn clone(&self) -> ColumnDef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnDef

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

Formats the value using the given formatter.