Trait Bind 

pub trait Bind {
    type T: IntoColumnRef + Clone;
    type I: IntoIterator<Item = Self::T>;
    type V: IntoIterator<Item = Expr>;
    type Cursor: Cursor;

    // Required methods
    fn columns() -> Self::I;
    fn values(cursor: <<Self as Bind>::Cursor as Cursor>::T) -> Self::V;
}

Trait for binding cursor values in paginated queries.

This trait defines how to serialize cursor data for keyset pagination. It specifies which columns are used for ordering and how to extract their values from a cursor.

Implementation

The trait is implemented for evento_core::Event to enable pagination over the event table using timestamp, version, and ID columns.

Associated Types

• T - Column reference type
• I - Iterator over column references
• V - Iterator over value expressions
• Cursor - The cursor type that provides pagination data

Required Associated Types

type T: IntoColumnRef + Clone

Column reference type (e.g., Event enum variant).

type I: IntoIterator<Item = Self::T>

Iterator type for columns.

type V: IntoIterator<Item = Expr>

Iterator type for values.

type Cursor: Cursor

The cursor type used for pagination.

Required Methods

fn columns() -> Self::I

Returns the columns used for cursor-based ordering.

fn values(cursor: <<Self as Bind>::Cursor as Cursor>::T) -> Self::V

Extracts values from a cursor for WHERE clause construction.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl Bind for SqlEvent

type T = Event

type I = [<SqlEvent as Bind>::T; 4]

type V = [Expr; 4]

type Cursor = SqlEvent