Struct Rows

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pub struct Rows<'inner, S> { /* private fields */ }
Expand description

Rows keeps track of all rows in the current query.

This is the base type for other query types like crate::args::Aggregate and crate::args::Query. It contains basic query functionality like joining tables and filters.

Rows mutability is only about which rows are included. Adding new columns does not require mutating Rows.

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impl<'inner, S> Rows<'inner, S>

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pub fn join<T: Table<Schema = S>>(&mut self, _: T) -> Expr<'inner, S, T>

Join a table, this is like a super simple Iterator::flat_map but for queries.

After this operation Rows has rows for the combinations of each original row with each row of the table. (Also called the “Carthesian product”)

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pub fn filter(&mut self, prop: impl IntoExpr<'inner, S, Typ = bool>)

Filter rows based on a column.

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pub fn filter_some<Typ: 'static>( &mut self, val: impl IntoExpr<'inner, S, Typ = Option<Typ>>, ) -> Expr<'inner, S, Typ>

Filter out rows where this column is None.

Returns a new column with the unwrapped type.

Auto Trait Implementations§

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impl<'inner, S> Freeze for Rows<'inner, S>

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impl<'inner, S> !RefUnwindSafe for Rows<'inner, S>

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impl<'inner, S> !Send for Rows<'inner, S>

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impl<'inner, S> !Sync for Rows<'inner, S>

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impl<'inner, S> Unpin for Rows<'inner, S>
where S: Unpin,

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impl<'inner, S> !UnwindSafe for Rows<'inner, S>

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