Storing datatype u64 in QuestDB - questdb

Question

Apparently, the Rust Postgres library doesn't allow the datatype u64 to be stored in QuestDB. So I am trying to sneak it in bypassing it as a String to the prepared statement:
INSERT INTO table_x VALUES ($1,cast($2 as LONG))
However, this is resulting in an error for me too, when I pass a String for $2:
Error { kind: ToSql(1), cause: Some(WrongType { postgres: Numeric, rust: "&alloc::string::String" }) }
Does anyone have an idea how to solve this?

Answer 1

The following works okay with as:
use postgres::{Client, NoTls, Error};
fn main() -> Result<(), Error> {
let mut client = Client::connect("postgresql://admin:quest#localhost:8812/qdb", NoTls)?;
// Basic query
client.batch_execute(
"CREATE TABLE IF NOT EXISTS rust (name STRING, value long);",
)?;
// Parameterized query
let name = "abc";
let uval: u64 = 9223372036854773000;
let val = uval as i64;
client.execute(
"INSERT INTO rust (name, value) VALUES ($1,$2)",
&[&name, &val],
)?;
println!("import finished");
Ok(())
}
Note the difference with i64 and u64 is the following:
i64 is +/- 9223372036854775808
u64 unsigned int is 0-18446744073709551615
The data type in QuestDB for long is 64 bit signed int (i64) so
if you have values over 9223372036854775808, you will need different handling.
edit for more information, see the following resources:
Data types in QuestDB
Rust postgres types
Rust i64 primitive type
Rust u64 primitive type