Enum Constraint 

pub enum Constraint {
    Eq(String, Value),
    Ne(String, Value),
    Gt(String, Value),
    Gte(String, Value),
    Lt(String, Value),
    Lte(String, Value),
    Like(String, String),
    NotLike(String, String),
    In(String, Vec<Value>),
    NotIn(String, Vec<Value>),
    Null(String),
    NotNull(String),
}

One recorded predicate.

Variants

Eq(String, Value)

column = value.

Ne(String, Value)

column <> value.

Gt(String, Value)

column > value.

Gte(String, Value)

column >= value.

Lt(String, Value)

column < value.

Lte(String, Value)

column <= value.

Like(String, String)

column LIKE pattern.

NotLike(String, String)

column NOT LIKE pattern.

In(String, Vec<Value>)

column IN (values).

NotIn(String, Vec<Value>)

column NOT IN (values).

Null(String)

column IS NULL.

NotNull(String)

column IS NOT NULL.

Implementations

impl Constraint

pub fn column(&self) -> &str

The column this constraint applies to.

pub fn as_equality(&self) -> Option<(&str, &Value)>

The (column, value) pair if this is an equality, else None.

Shard routing keys off equalities specifically: user_id = 42 names one shard, whereas user_id > 42 could span all of them.

pub fn to_expr(&self, column: ColumnRef) -> SimpleExpr

Render as a sea_query expression against an already-resolved column.

Trait Implementations

impl Clone for Constraint

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Constraint

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

Formats the value using the given formatter.