afidegnum edited a comment on issue #162:
URL: https://github.com/apache/incubator-age/issues/162#issuecomment-997583723
This is my attempted implementation so far, which wasn't successful. I
believe there is something I'm not properly addressing.
Cargo.toml
```toml
. . . .
# [dependencies]
rand = { version = "0.7.3" }
tokio-postgres = { version = "0.5", features = ["with-chrono-0_4",
"with-uuid-0_8"] }
postgres-protocol = "*"
postgres = "0.19.2"
postgres-types = "*"
```
src/main.rs
```rs
struct AgType<'a>(&'a str);
impl<'a> Display for AgType<'a>{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let d: &str = self.0 ;
write!(f, "({})", d)
}
}
impl<'a> FromSql<'a> for AgType<'a> {
fn from_sql(_: &Type, raw: &'a [u8]) -> Result<AgType<'a>, Box<dyn Error
+ Sync + Send>> {
let t = types::text_from_sql(raw)?;
Ok(AgType(t))
}
fn accepts(ty: &Type) -> bool {
ty.name() == "agtype"
}
}
fn main(){
pub fn graph_list() -> Result<(), Box<dyn Error>> {
let conn_string = "host=localhost port=5432 dbname=texttest
user=afidegnum password=chou1979";
let mut client= Client::connect(conn_string, NoTls)?;
&client
.batch_execute("LOAD \'age\'")?;
&client
.batch_execute("SET search_path = ag_catalog, \"$user\", public")?;
for row in &client.query("SELECT count(*) FROM ag_graph WHERE name=
'text_test'", &[])?{
println!("{}", row.get::<_, i64>(0));
let count: i64 = row.get(0); println!("{}", count);
println!("{}", count);
dbg!(count);
}
for row in client.query("SELECT * from cypher('text_test', $$ MATCH
(V:node) RETURN id(V) as vid $$) as (vid agtype)", &[])? {
let path: AgType = row.get(0);
println!("{}", path)
}
Ok(())
}
let res = graph_list();
match res {
Ok(r) => {println!("Succeeded! {:?} ", r);},
Err(e) => {println!("Error: {}!", e);}
}
}
```
```
1
[src/lib.rs:20] count = 1
1
1
Error: db error: ERROR: no binary output function available for type agtype!
```
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