61 lines
1.9 KiB
Rust
61 lines
1.9 KiB
Rust
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// Copyright 2016 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 std::collections::HashMap;
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use mentat_core::{
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TypedValue,
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};
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use mentat_db::DB;
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use mentat_query_parser::{
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parse_find_string,
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QueryParseError,
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};
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// TODO
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pub type SQLiteConnection = ();
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pub enum QueryResults {
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Scalar(Option<TypedValue>),
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Tuple(Vec<TypedValue>),
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Coll(Vec<TypedValue>),
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Rel(Vec<Vec<TypedValue>>),
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}
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pub enum QueryExecutionError {
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ParseError(QueryParseError),
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InvalidArgumentName(String),
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}
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impl From<QueryParseError> for QueryExecutionError {
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fn from(err: QueryParseError) -> QueryExecutionError {
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QueryExecutionError::ParseError(err)
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}
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}
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pub type QueryExecutionResult = Result<QueryResults, QueryExecutionError>;
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/// Take an EDN query string, a reference to a open SQLite connection, a Mentat DB, and an optional
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/// collection of input bindings (which should be keyed by `"?varname"`), and execute the query
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/// immediately, blocking the current thread.
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/// Returns a structure that corresponds to the kind of input query, populated with `TypedValue`
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/// instances.
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#[allow(unused_variables)]
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pub fn q_once(sqlite: SQLiteConnection,
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db: DB,
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query: &str,
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inputs: Option<HashMap<String, TypedValue>>) -> QueryExecutionResult {
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// TODO: validate inputs.
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let parsed = parse_find_string(query)?;
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Ok(QueryResults::Scalar(Some(TypedValue::Boolean(true))))
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}
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