Wasm-rust and postgres - postgresql

Question

is there a way to get data from a database in postgres using wasm?. I'd tried to get it using a library in rust but I got some errore when I build the package using "wasm-pack building--target web". The idea is to build a function in lib.rs file that return data from a db. I have the below code inside lib.rs:
use postgres::{Client, Error, NoTls};
use wasm_bindgen::prelude::*;
...
struct Author {
_id: i32,
name: String,
}
#[wasm_bindgen]
pub fn select_name(name: &String) -> Result<(), Error> {
let mut client = Client::connect("postgresql://user:1234#localhost:5432/db", NoTls)?;
for row in client.query(
"SELECT id, name FROM author WHERE name = $1",
&[&name],
)? {
let author = Author {
_id: row.get(0),
name: row.get(1),
};
println!(
"Select_Name => Author {} :",
author.name
);
}
Ok(())
}
but I get some errors:
error[E0432]: unresolved import `crate::sys::IoSourceState`
error[E0432]: unresolved import `crate::sys`
...

Answer 1

It is not possible directly (as Njuguna Mureithi rightly wrote) but it can be circumvented.
We can use the project: https://github.com/PostgREST/postgrest
and expose the API to our sql server.
We download the latest version of postgrest
https://github.com/PostgREST/postgrest/releases/tag/v9.0.0
in case of Linux we unpack
tar -xf postgrest-v9.0.0-linux-static-x64.tar.xz
then run help
./postgrest -h
create a configuration file for ./postgrest
postgrest -e > cfg.psqlrest
change the user and password for the database in the configuration file.
e.g. with
db-uri = "postgres://user:pasword#localhost:5432/dbname"
to your dbname database access user:pasword configuration
db-uri = "postgres://postgres:zaqwsxc#localhost:5432/dbname"
and run the server which will issue the api to our postgres
./postgrest cfg.psqlrest
The address http://localhost:3000 will start accessing the database dbname, which must be created in the database server beforehand.
Here is a description of the libraries needed to call the query using the API.
https://rustwasm.github.io/wasm-bindgen/examples/fetch.html
examples of API
https://postgrest.org/en/stable/api.html