36 lines
1.3 KiB
Rust
36 lines
1.3 KiB
Rust
// Copyright 2018 Mozilla
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
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// this file except in compliance with the License. You may obtain a copy of the
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// License at http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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use super::{rusqlite, Element, QueryOutput, Rows, Schema};
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use query_projector_traits::errors::Result;
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pub trait Projector {
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fn project<'stmt, 's>(
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&self,
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schema: &Schema,
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sqlite: &'s rusqlite::Connection,
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rows: Rows<'stmt>,
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) -> Result<QueryOutput>;
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fn columns<'s>(&'s self) -> Box<dyn Iterator<Item = &Element> + 's>;
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}
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mod constant;
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mod pull_two_stage;
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mod simple;
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pub use self::constant::ConstantProjector;
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pub(crate) use self::simple::{CollProjector, RelProjector, ScalarProjector, TupleProjector};
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pub(crate) use self::pull_two_stage::{
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CollTwoStagePullProjector, RelTwoStagePullProjector, ScalarTwoStagePullProjector,
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TupleTwoStagePullProjector,
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};
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