uqa-sql 0.4.9

PostgreSQL-compatible SQL compiler built on libpg_query
Documentation 
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//
// Unified Query Algebra
//
// Copyright (c) 2023-2026 Cognica, Inc.
//

//! `INSERT ... OVERRIDING` selection of identity column values.

use serde::{Deserialize, Serialize};

/// Which value an `INSERT` writes to an identity column it supplies a value for. Without the clause a supplied value is written to a `GENERATED BY DEFAULT` identity column and rejected for a `GENERATED ALWAYS` one.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum OverridingKind {
    /// `OVERRIDING SYSTEM VALUE`: write the supplied value, also to a `GENERATED ALWAYS` column.
    SystemValue,
    /// `OVERRIDING USER VALUE`: discard the supplied value and draw the column's next sequence value.
    UserValue,
}

impl OverridingKind {
    /// The SQL clause, as `PostgreSQL` prints it.
    #[must_use]
    pub const fn sql(self) -> &'static str {
        match self {
            Self::SystemValue => "OVERRIDING SYSTEM VALUE",
            Self::UserValue => "OVERRIDING USER VALUE",
        }
    }
}