Enum PlPgSqlStmt 

pub enum PlPgSqlStmt {
    Assign {
        target: AssignTarget,
        value: Expr,
    },
    Return(ReturnTarget),
    If {
        branches: Vec<(Expr, Vec<PlPgSqlStmt>)>,
        else_branch: Vec<PlPgSqlStmt>,
    },
    Raise {
        level: RaiseLevel,
        message: String,
        args: Vec<Expr>,
    },
    EmbeddedSql(Box<Statement>),
}

Variants

Assign

NEW.col := expr; or OLD.col := expr;. OLD is parsed for clarity in error reporting (PG also forbids it) — the executor errors with a clear “OLD is read-only” message.

Fields

target: AssignTarget

value: Expr

Return(ReturnTarget)

RETURN <target>; — trigger functions canonically return NEW / OLD / NULL; v7.12.4 also accepts a bare expression for forward compatibility with scalar UDFs.

If

v7.12.6 — IF cond THEN body [ELSIF cond THEN body]* [ELSE body] END IF;. Branches are tried in order; first truthy condition wins; the optional ELSE runs when no condition matched.

Fields

branches: Vec<(Expr, Vec<PlPgSqlStmt>)>

else_branch: Vec<PlPgSqlStmt>

Raise

v7.12.6 — RAISE <level> '<fmt>' [, args]*;. Level is one of NOTICE / WARNING / INFO / LOG / DEBUG (logging — observable side effect only) or EXCEPTION (aborts the trigger and propagates as an error). v7.12.6 supports the basic format-string substitution PG uses (% placeholders consumed positionally).

Fields

level: RaiseLevel

message: String

args: Vec<Expr>

EmbeddedSql(Box<Statement>)

v7.12.6 — embedded SQL statement inside the trigger body (INSERT INTO …, UPDATE …, DELETE FROM …, SELECT …). NEW.col / OLD.col references inside the embedded statement’s expression tree are substituted with the current trigger context before the engine re-executes the statement. Recursion depth into nested triggers is bounded by the engine’s existing trigger-fire guard.

Trait Implementations

impl Clone for PlPgSqlStmt

fn clone(&self) -> PlPgSqlStmt

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PlPgSqlStmt

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for PlPgSqlStmt

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for PlPgSqlStmt

fn eq(&self, other: &PlPgSqlStmt) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for PlPgSqlStmt