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//! `SqlValue` — the dialect-neutral value carrier between the query layer
//! and the SQL backend.
//!
//! Every concrete bound parameter ultimately becomes one of these.
use chrono::{DateTime, NaiveDate, NaiveTime, Utc};
use rust_decimal::Decimal;
use uuid::Uuid;
use super::FieldType;
/// A typed value that can be bound to a query parameter.
#[derive(Debug, Clone, PartialEq)]
pub enum SqlValue {
Null,
/// 2-byte signed integer — Postgres `SMALLINT`, MySQL `SMALLINT`.
I16(i16),
I32(i32),
I64(i64),
F32(f32),
F64(f64),
Bool(bool),
String(String),
DateTime(DateTime<Utc>),
Date(NaiveDate),
Uuid(Uuid),
Json(serde_json::Value),
/// Fixed-point exact decimal — pairs with [`FieldType::Decimal`].
/// Postgres / MySQL `NUMERIC` / `DECIMAL`; SQLite text-affinity
/// `NUMERIC`. Rust type: `rust_decimal::Decimal`.
Decimal(Decimal),
/// Binary blob — pairs with [`FieldType::Binary`]. PG `BYTEA`,
/// MySQL `LONGBLOB`, SQLite `BLOB`.
Binary(Vec<u8>),
/// Time of day, no date component — pairs with
/// [`FieldType::Time`]. Rust type: `chrono::NaiveTime`.
Time(NaiveTime),
/// Used for `IN` and `BETWEEN` lookups. Expanded to `($1, $2, $3)`
/// placeholders at writer time — each element is a separate bound
/// parameter.
List(Vec<SqlValue>),
/// PG **single-parameter** array — binds as a single placeholder
/// (`$1`) holding a `Vec<T>` value. Distinct from [`Self::List`],
/// which fans out to one placeholder per element. Used by
/// [`crate::core::Op::ArrayContains`] / `ArrayContainedBy` /
/// `ArrayOverlap` (PG `@>` / `<@` / `&&`).
///
/// The first element's variant determines the bind shape. **v1
/// supports `I64` and `String` element types** (the two most
/// common Django `ArrayField(IntegerField/CharField)` shapes);
/// other element kinds error at bind time. Empty arrays bind as
/// `Vec::<i32>::new()` — PG infers the element type from the
/// `<col> <op>` clause. Issue #30.
Array(Vec<SqlValue>),
/// PG range literal as text — bound as a `String` parameter that
/// Postgres implicit-casts to the column's range type when the
/// operator's LHS is a range column. Pairs with
/// [`crate::core::Op::RangeContains`] / `RangeContainedBy` /
/// `RangeOverlap` / `RangeStrictlyLeft` / `RangeStrictlyRight` /
/// `RangeAdjacent`. Issue #31.
///
/// Example literals (one element type per column type):
/// - int4range / int8range: `"[1, 10)"`, `"(1, 10]"`, `"[5,)"`
/// - daterange: `"[2025-01-01, 2025-02-01)"`
/// - tstzrange: `"[2025-01-01 00:00+00, 2025-02-01 00:00+00)"`
/// - empty range: `"empty"`
/// - unbounded: `"(,)"`
///
/// The string is bound as-is; we don't parse or validate the
/// shape (sticking to the same "PG handles the cast" pattern as
/// our other text-bound types like Json).
RangeLiteral(String),
}
impl SqlValue {
/// Render the value as a short human-readable string for use in
/// error messages. Lists collapse into `[a, b, …]`; `Null` shows
/// `NULL`; binary-ish payloads (`Json`) show their `Display` form.
/// This is NOT for SQL emission — use the dialect formatter for
/// that. Only callers that want to embed the value in a
/// user-facing error message should reach for this.
#[must_use]
pub fn to_display_string(&self) -> String {
match self {
Self::Null => "NULL".to_owned(),
Self::I16(v) => v.to_string(),
Self::I32(v) => v.to_string(),
Self::I64(v) => v.to_string(),
Self::F32(v) => v.to_string(),
Self::F64(v) => v.to_string(),
Self::Bool(v) => v.to_string(),
Self::String(v) => v.clone(),
Self::DateTime(v) => v.to_rfc3339(),
Self::Date(v) => v.to_string(),
Self::Uuid(v) => v.to_string(),
Self::Json(v) => v.to_string(),
Self::Decimal(v) => v.to_string(),
Self::Binary(bytes) => format!("<binary {} bytes>", bytes.len()),
Self::Time(v) => v.to_string(),
Self::List(items) => {
let inner: Vec<String> = items.iter().map(Self::to_display_string).collect();
format!("[{}]", inner.join(", "))
}
Self::Array(items) => {
let inner: Vec<String> = items.iter().map(Self::to_display_string).collect();
format!("array[{}]", inner.join(", "))
}
Self::RangeLiteral(s) => format!("range{s}"),
}
}
/// Returns the `FieldType` this value corresponds to, or `None` for `Null` / `List`.
#[must_use]
pub fn field_type(&self) -> Option<FieldType> {
Some(match self {
Self::Null | Self::List(_) | Self::Array(_) | Self::RangeLiteral(_) => return None,
Self::I16(_) => FieldType::I16,
Self::I32(_) => FieldType::I32,
Self::I64(_) => FieldType::I64,
Self::F32(_) => FieldType::F32,
Self::F64(_) => FieldType::F64,
Self::Bool(_) => FieldType::Bool,
Self::String(_) => FieldType::String,
Self::DateTime(_) => FieldType::DateTime,
Self::Date(_) => FieldType::Date,
Self::Uuid(_) => FieldType::Uuid,
Self::Json(_) => FieldType::Json,
Self::Decimal(_) => FieldType::Decimal,
Self::Binary(_) => FieldType::Binary,
Self::Time(_) => FieldType::Time,
})
}
}
macro_rules! sql_value_from {
($($t:ty => $variant:ident),+ $(,)?) => {
$(
impl From<$t> for SqlValue {
fn from(v: $t) -> Self { Self::$variant(v) }
}
)+
};
}
sql_value_from! {
i16 => I16,
i32 => I32,
i64 => I64,
f32 => F32,
f64 => F64,
bool => Bool,
String => String,
DateTime<Utc> => DateTime,
NaiveDate => Date,
NaiveTime => Time,
Uuid => Uuid,
serde_json::Value => Json,
Decimal => Decimal,
Vec<u8> => Binary,
}
impl From<&str> for SqlValue {
fn from(v: &str) -> Self {
Self::String(v.to_owned())
}
}
impl<T: Into<SqlValue>> From<Option<T>> for SqlValue {
fn from(v: Option<T>) -> Self {
match v {
Some(x) => x.into(),
None => Self::Null,
}
}
}