Struct TriggerCondition 

pub struct TriggerCondition {
    pub expression: String,
}

A WHEN condition for conditional triggers.

Fields

expression: String

The SQL expression for the condition.

Implementations

impl TriggerCondition

pub fn new(expression: impl Into<String>) -> Self

Create a new trigger condition.

pub fn column_changed(column: &str) -> Self

Check if OLD.column differs from NEW.column.

pub fn new_not_null(column: &str) -> Self

Check if NEW.column is not null.

pub fn old_was_null(column: &str) -> Self

Check if OLD.column was null.

pub fn and(self, other: Self) -> Self

Combine conditions with AND.

pub fn or(self, other: Self) -> Self

Combine conditions with OR.

Trait Implementations

impl Clone for TriggerCondition

fn clone(&self) -> TriggerCondition

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TriggerCondition

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for TriggerCondition

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for TriggerCondition

fn eq(&self, other: &TriggerCondition) -> 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 TriggerCondition

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for TriggerCondition

impl StructuralPartialEq for TriggerCondition