Struct ConstraintDefinition 

pub struct ConstraintDefinition {
    pub name: String,
    pub constraint_type: ConstraintType,
    pub columns: Vec<String>,
    pub reference_table: Option<String>,
    pub reference_columns: Option<Vec<String>>,
    pub on_delete: Option<ReferentialAction>,
    pub on_update: Option<ReferentialAction>,
    pub check_condition: Option<String>,
}

约束定义

Fields

name: String

约束名

constraint_type: ConstraintType

约束类型

columns: Vec<String>

约束列

reference_table: Option<String>

引用表（用于外键约束）

reference_columns: Option<Vec<String>>

引用列（用于外键约束）

on_delete: Option<ReferentialAction>

删除时的动作

on_update: Option<ReferentialAction>

更新时的动作

check_condition: Option<String>

检查条件（用于检查约束）

Implementations

impl ConstraintDefinition

pub fn primary_key(name: String, columns: Vec<String>) -> Self

创建主键约束

pub fn foreign_key( name: String, columns: Vec<String>, reference_table: String, reference_columns: Vec<String>, ) -> Self

创建外键约束

pub fn unique(name: String, columns: Vec<String>) -> Self

创建唯一约束

pub fn check(name: String, condition: String) -> Self

创建检查约束

pub fn on_delete(self, action: ReferentialAction) -> Self

设置删除时的动作

pub fn on_update(self, action: ReferentialAction) -> Self

设置更新时的动作

Trait Implementations

impl Clone for ConstraintDefinition

fn clone(&self) -> ConstraintDefinition

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ConstraintDefinition

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ConstraintDefinition

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for ConstraintDefinition

fn eq(&self, other: &ConstraintDefinition) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for ConstraintDefinition

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ConstraintDefinition