Struct QueryOne 

pub struct QueryOne { /* private fields */ }

Execute a SELECT query and return exactly one row.

Errors

Returns an error if the query returns zero rows or more than one row.

Examples

use ironflow_ops_postgres::query::QueryOne;
use ironflow_core::operation::Operation;

let op = QueryOne::new(pool, "SELECT id, name FROM users WHERE id = $1", vec![serde_json::json!(1)]);
assert_eq!(op.kind(), "postgres");

Implementations

impl QueryOne

pub fn new(pool: PgPool, sql: impl Into<String>, params: Vec<Value>) -> Self

Create a new query-one operation.

pub async fn run( &self, _ctx: &OperationContext, ) -> Result<QueryOneOutput, OperationError>

Execute and return a typed result.

Errors

Returns OperationError::External if the query returns zero rows, more than one row, or on SQL/connection errors.

Trait Implementations

impl Operation for QueryOne

fn kind(&self) -> &str

A short, lowercase identifier for this operation type.

fn execute<'life0, 'life1, 'async_trait>( &'life0 self, ctx: &'life1 OperationContext, ) -> Pin<Box<dyn Future<Output = Result<Value, OperationError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Execute the operation and return the result as JSON.

fn input(&self) -> Option<Value>

Optional JSON representation of the operation input, stored in the step’s input column for observability.

impl TypedOperation for QueryOne

type Output = QueryOneOutput

The concrete output type that Operation::execute produces.