Prepared statements Issue with pgBouncer with 'transaction' pool_mode - postgresql

Question

I have Prepared statements Issue with pgBouncer in 'transaction' pooling mode.
This Rust code:
use postgres::{Client, Error, NoTls};
fn main() -> Result<(), Error> {
let mut client = Client::connect(
"postgresql://haproxy#localhost:9435/haproxy",
NoTls,
)?;
for row in client.query("SELECT pg_is_in_recovery() as x;", &[])? {
let x: bool = row.get(0);
println!(
"found app x: {}",
x
);
}
Ok(())
}
fails with: prepared statement "s0" does not exist
Error: Error { kind: Db, cause: Some(DbError { severity: "ERROR", parsed_severity: Some(Error), code: SqlState(E26000), message: "prepared statement \"s0\" does not exist", detail: None, hint: None, position: None, where_: None, schema: None, table: None, column: None, datatype: None, constraint: None, file: Some("prepare.c"), line: Some(506), routine: Some("FetchPreparedStatement") }) }
Any solution to this?

Answer 1

FTR!
the answer is using simple_query !
use postgres::{Client, Error, NoTls, SimpleQueryMessage};
fn main() -> Result<(), Error> {
let mut client = Client::connect("postgresql://haproxy#localhost:9435/haproxy", NoTls)?;
let mut res = false;
let it = client.simple_query("SELECT pg_is_in_recovery()")?;
for mm in it {
match mm {
SimpleQueryMessage::CommandComplete(_x) => {
// println!("{:?}", x);
}
SimpleQueryMessage::Row(x) => {
if x.get(0).as_ref().unwrap().contains('t') {
res = true;
} else {
res = false;
}
}
_ => panic!("n"),
}
}
println!("Result is: {}", res);
Ok(())
}