pub struct Response(/* private fields */);
Expand description
The response type of a Surreal::query
request
Implementations§
source§impl Response
impl Response
sourcepub fn take<R>(&mut self, index: impl QueryResult<R>) -> Result<R>where
R: DeserializeOwned,
pub fn take<R>(&mut self, index: impl QueryResult<R>) -> Result<R>where
R: DeserializeOwned,
Takes and returns records returned from the database
A query that only returns one result can be deserialized into an
Option<T>
, while those that return multiple results should be
deserialized into a Vec<T>
.
Examples
use serde::Deserialize;
use surrealdb::sql;
#[derive(Debug, Deserialize)]
struct User {
id: String,
balance: String
}
let mut response = db
// Get `john`'s details
.query("SELECT * FROM user:john")
// List all users whose first name is John
.query("SELECT * FROM user WHERE name.first = 'John'")
// Get John's address
.query("SELECT address FROM user:john")
// Get all users' addresses
.query("SELECT address FROM user")
.await?;
// Get the first (and only) user from the first query
let user: Option<User> = response.take(0)?;
// Get all users from the second query
let users: Vec<User> = response.take(1)?;
// Retrieve John's address without making a special struct for it
let address: Option<String> = response.take((2, "address"))?;
// Get all users' addresses
let addresses: Vec<String> = response.take((3, "address"))?;
// You can continue taking more fields on the same response
// object when extracting individual fields
let mut response = db.query("SELECT * FROM user").await?;
// Since the query we want to access is at index 0, we can use
// a shortcut instead of `response.take((0, "field"))`
let ids: Vec<String> = response.take("id")?;
let names: Vec<String> = response.take("name")?;
let addresses: Vec<String> = response.take("address")?;
The indices are stable. Taking one index doesn’t affect the numbering of the other indices, so you can take them in any order you see fit.
sourcepub fn take_errors(&mut self) -> HashMap<usize, Error>
pub fn take_errors(&mut self) -> HashMap<usize, Error>
Take all errors from the query response
The errors are keyed by the corresponding index of the statement that failed. Afterwards the response is left with only statements that did not produce any errors.
Examples
use surrealdb::sql;
let errors = response.take_errors();
sourcepub fn check(self) -> Result<Self>
pub fn check(self) -> Result<Self>
Check query response for errors and return the first error, if any, or the response
Examples
use surrealdb::sql;
response.check()?;
sourcepub fn num_statements(&self) -> usize
pub fn num_statements(&self) -> usize
Returns the number of statements in the query
Examples
use surrealdb::sql;
let response = db.query("SELECT * FROM user:john; SELECT * FROM user;").await?;
assert_eq!(response.num_statements(), 2);
Trait Implementations§
Auto Trait Implementations§
impl !RefUnwindSafe for Response
impl Send for Response
impl Sync for Response
impl Unpin for Response
impl !UnwindSafe for Response
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T: ?Sized,
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