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//! `SqlValue` — the backend-neutral value passed from the query layer
//! to the SQL backend. Every bound parameter 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)]
#[non_exhaustive]
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),
/// For `IN` and `BETWEEN`. The writer expands it to
/// `($1, $2, $3)`, one bound parameter per element.
List(Vec<SqlValue>),
/// PG array bound as one placeholder holding a `Vec<T>`. Unlike
/// [`Self::List`], it does not fan out to one placeholder per
/// element. Used by [`crate::core::Op::ArrayContains`],
/// `ArrayContainedBy` and `ArrayOverlap` (PG `@>` / `<@` / `&&`).
///
/// The first element picks the bind type: `I32`, `I64`, `String`
/// or `Bool`. Other element types error at bind time. An empty
/// array binds as `Vec::<i32>::new()`; PG then infers the element
/// type from the clause.
Array(Vec<SqlValue>),
/// PG range literal, bound as text. Postgres casts it to the
/// column's range type. The string is bound as-is; we never parse
/// or check it. Pairs with [`crate::core::Op::RangeContains`],
/// `RangeContainedBy`, `RangeOverlap`, `RangeStrictlyLeft`,
/// `RangeStrictlyRight` and `RangeAdjacent`.
///
/// Examples: `"[1, 10)"`, `"[5,)"`,
/// `"[2025-01-01, 2025-02-01)"`, `"empty"`, `"(,)"`.
RangeLiteral(String),
/// PG `hstore` map as `(key, value)` pairs, where a value may be
/// NULL. The PG bind path turns it into a `PgHstore`; MySQL and
/// SQLite reject it. Build it from [`crate::sql::HStore`].
HStore(Vec<(String, Option<String>)>),
/// pgvector embedding as a dense `Vec<f32>`. The PG bind path
/// encodes the pgvector wire format; MySQL and SQLite reject it.
/// Build it from [`crate::sql::Vector`].
Vector(Vec<f32>),
/// PostGIS `geometry(Point, …)`: 2-D coordinates plus an SRID. The
/// PG bind path encodes it as EWKB; MySQL and SQLite reject it.
/// Build it from [`crate::sql::Point`].
Geometry {
x: f64,
y: f64,
srid: u32,
},
}
impl SqlValue {
/// A short, readable form of the value for error messages. Lists
/// become `[a, b, …]` and `Null` becomes `NULL`. Never use it to
/// build SQL; the dialect formatter does that.
#[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}"),
Self::HStore(pairs) => {
let inner: Vec<String> = pairs
.iter()
.map(|(k, v)| match v {
Some(v) => format!("{k}=>{v}"),
None => format!("{k}=>NULL"),
})
.collect();
format!("hstore{{{}}}", inner.join(", "))
}
Self::Vector(items) => {
let inner: Vec<String> = items.iter().map(f32::to_string).collect();
format!("vector[{}]", inner.join(", "))
}
Self::Geometry { x, y, srid } => format!("SRID={srid};POINT({x} {y})"),
}
}
/// The [`FieldType`] for this value, or `None` for `Null` and the
/// container variants (`List`, `Array`, `RangeLiteral`, `HStore`,
/// `Vector`, `Geometry`), which carry no checkable type here.
#[must_use]
pub fn field_type(&self) -> Option<FieldType> {
Some(match self {
Self::Null
| Self::List(_)
| Self::Array(_)
| Self::RangeLiteral(_)
| Self::HStore(_)
// No dimension here, so it can't be checked against the
// column's `FieldType::Vector(dims)` from the schema.
| Self::Vector(_)
// Same for the SRID in `FieldType::Geometry(srid)`.
| Self::Geometry { .. } => 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,
}
}
}