toasty_core/stmt/
expr_func.rs

1use super::{Expr, FuncCount, FuncJsonExtract, FuncLastInsertId, FuncUnnest};
2
3/// A function call expression.
4///
5/// Represents aggregate, scalar, and set-returning functions applied to
6/// expressions.
7///
8/// # Examples
9///
10/// ```text
11/// count(*)           // counts all rows
12/// count(field)       // counts non-null values
13/// last_insert_id()   // MySQL: get the last auto-increment ID
14/// unnest(array)       // PostgreSQL: expands an array into rows
15/// ```
16#[derive(Clone, Debug, PartialEq)]
17pub enum ExprFunc {
18    /// The `count` aggregate function.
19    Count(FuncCount),
20
21    /// The `LAST_INSERT_ID()` function (MySQL-specific).
22    ///
23    /// Returns the first auto-increment ID that was generated for an INSERT statement.
24    /// When multiple rows are inserted, this returns the ID of the first row.
25    LastInsertId(FuncLastInsertId),
26
27    /// Extracts a value at a key path from a document-stored value (a JSON
28    /// extraction on the SQL backends). Produced when filtering on a field
29    /// inside a `#[document]` embed.
30    JsonExtract(FuncJsonExtract),
31
32    /// Expands a PostgreSQL array into a set of rows.
33    Unnest(FuncUnnest),
34}
35
36impl From<ExprFunc> for Expr {
37    fn from(value: ExprFunc) -> Self {
38        Self::Func(value)
39    }
40}
toasty_core/stmt/expr_func.rs

toasty_core/stmt/
expr_func.rs
