Macro pgx::error

macro_rules! error {
    () => { ... };
    ($msg:expr) => { ... };
    ($msg:expr,) => { ... };
    ($fmt:expr, $($arg:tt)+) => { ... };
}

Log to Postgres’ error log level. This will abort the current Postgres transaction.

This macro accepts arguments like the println and format macros. See fmt for information about options.

Given some function:

use pgx::*;

#[pg_extern]
fn sum_array(input: Array<i32>) -> i64 {
    let mut sum = 0 as i64;

    for i in input {
        pgx::error!("i={index:?}, sum={}", sum, index = i);
        sum += i.unwrap_or(-1) as i64;
    }

    sum
}

When run inside PostgreSQL would output:

arrays=# SELECT arrays.sum_array('{1,2,3}');
ERROR:  i=Some(1), sum=0
CONTEXT:  src/lib.rs:37:9