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6b22fb7489
* Intending to use in a new Row type to check types at runtime for dynamic queries and to guard against schema changes * Hoping the query! macro can utilize this to allow accepting N rust types for 1 sql type and returning N rust types for 1 sql type.
58 lines
1.4 KiB
Rust
58 lines
1.4 KiB
Rust
//! Types for returning SQL type information about queries.
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use crate::Database;
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use std::fmt::{self, Debug};
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/// The return type of [Executor::describe].
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#[non_exhaustive]
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pub struct Describe<DB>
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where
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DB: Database + ?Sized,
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{
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/// The expected types for the parameters of the query.
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pub param_types: Box<[DB::TypeInfo]>,
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/// The type and table information, if any for the results of the query.
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pub result_columns: Box<[Column<DB>]>,
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}
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impl<DB> Debug for Describe<DB>
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where
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DB: Database,
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DB::TypeInfo: Debug,
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Column<DB>: Debug,
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{
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.debug_struct("Describe")
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.field("param_types", &self.param_types)
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.field("result_columns", &self.result_columns)
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.finish()
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}
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}
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/// A single column of a result set.
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#[non_exhaustive]
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pub struct Column<DB>
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where
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DB: Database + ?Sized,
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{
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pub name: Option<Box<str>>,
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pub table_id: Option<DB::TableId>,
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pub type_info: DB::TypeInfo,
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}
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impl<DB> Debug for Column<DB>
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where
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DB: Database + ?Sized,
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DB::TableId: Debug,
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DB::TypeInfo: Debug,
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{
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.debug_struct("Column")
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.field("name", &self.name)
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.field("table_id", &self.table_id)
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.field("type_id", &self.type_info)
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.finish()
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}
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}
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