如何解决Rust `sqlx` 抱怨缺少 trait 实现
pub async fn create_property(
&self,property: Property,) -> Result<PropertyId,sqlx::Error> {
/* acquire connection from the pool */
let mut conn = self.pool.acquire().await?;
/* insert the property and retrieve its ID */
let id = sqlx::query(
r#"INSERT INTO properties (
address_unit_number,address_street_number,address_street,address_suburb,address_state,address_postcode,area,property_type,available,num_bedrooms,num_bathrooms,num_garages
) VALUES (?1,?2,?3,?4,?5,?6,?7,?8,?9,?10,?11,?12);"#)
.bind(property.address.unit_number)
.bind(property.address.street_number)
.bind(property.address.street)
.bind(property.address.suburb)
.bind(property.address.state)
.bind(property.address.postcode)
.bind(property.area)
.bind(property.property_type)
.bind(property.available)
.bind(property.num_bedrooms)
.bind(property.num_bathrooms)
.bind(property.num_garages)
.execute(&mut conn)
.await?
.last_insert_rowid();
Ok(id)
}
编译器每次调用 bind 时都会抱怨：
$ cargo run
Compiling proj v0.1.0 (/home/user/proj)
error[E0277]: the trait bound `std::option::Option<u8>: Encode<'_,_>` is not satisfied
--> src/db.rs:44:19
|
44 | .bind(property.address.unit_number)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Encode<'_,_>` is not implemented for `std::option::Option<u8>`
|
= help: the following implementations were found:
<std::option::Option<T> as Encode<'q,Postgres>>
<std::option::Option<T> as Encode<'q,sqlite>>
error[E0277]: the trait bound `u8: Type<_>` is not satisfied
--> src/db.rs:44:19
|
44 | .bind(property.address.unit_number)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Type<_>` is not implemented for `u8`
|
= note: required because of the requirements on the impl of `Type<_>` for `std::option::Option<u8>`
error[E0277]: the trait bound `u64: Encode<'_,_>` is not satisfied
--> src/db.rs:45:19
|
45 | .bind(property.address.street_number)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Encode<'_,_>` is not implemented for `u64`
error[E0277]: the trait bound `u64: Type<_>` is not satisfied
--> src/db.rs:45:19
|
45 | .bind(property.address.street_number)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Type<_>` is not implemented for `u64`
error[E0277]: the trait bound `Addressstate: Encode<'_,_>` is not satisfied
--> src/db.rs:48:19
|
48 | .bind(property.address.state)
| ^^^^^^^^^^^^^^^^^^^^^^ the trait `Encode<'_,_>` is not implemented for `Addressstate`
error[E0277]: the trait bound `Addressstate: Type<_>` is not satisfied
--> src/db.rs:48:19
|
48 | .bind(property.address.state)
| ^^^^^^^^^^^^^^^^^^^^^^ the trait `Type<_>` is not implemented for `Addressstate`
error[E0277]: the trait bound `u64: Encode<'_,_>` is not satisfied
--> src/db.rs:49:19
|
49 | .bind(property.address.postcode)
| ^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Encode<'_,_>` is not implemented for `u64`
error[E0277]: the trait bound `u64: Type<_>` is not satisfied
--> src/db.rs:49:19
|
49 | .bind(property.address.postcode)
| ^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Type<_>` is not implemented for `u64`
error[E0277]: the trait bound `u64: Encode<'_,_>` is not satisfied
--> src/db.rs:50:19
|
50 | .bind(property.area)
| ^^^^^^^^^^^^^ the trait `Encode<'_,_>` is not implemented for `u64`
error[E0277]: the trait bound `u64: Type<_>` is not satisfied
--> src/db.rs:50:19
|
50 | .bind(property.area)
| ^^^^^^^^^^^^^ the trait `Type<_>` is not implemented for `u64`
error[E0277]: the trait bound `PropertyType: Encode<'_,_>` is not satisfied
--> src/db.rs:51:19
|
51 | .bind(property.property_type)
| ^^^^^^^^^^^^^^^^^^^^^^ the trait `Encode<'_,_>` is not implemented for `PropertyType`
error[E0277]: the trait bound `PropertyType: Type<_>` is not satisfied
--> src/db.rs:51:19
|
51 | .bind(property.property_type)
| ^^^^^^^^^^^^^^^^^^^^^^ the trait `Type<_>` is not implemented for `PropertyType`
error[E0277]: the trait bound `std::option::Option<u8>: Encode<'_,_>` is not satisfied
--> src/db.rs:53:19
|
53 | .bind(property.num_bedrooms)
| ^^^^^^^^^^^^^^^^^^^^^ the trait `Encode<'_,sqlite>>
error[E0277]: the trait bound `u8: Type<_>` is not satisfied
--> src/db.rs:53:19
|
53 | .bind(property.num_bedrooms)
| ^^^^^^^^^^^^^^^^^^^^^ the trait `Type<_>` is not implemented for `u8`
|
= note: required because of the requirements on the impl of `Type<_>` for `std::option::Option<u8>`
error[E0277]: the trait bound `std::option::Option<u8>: Encode<'_,_>` is not satisfied
--> src/db.rs:54:19
|
54 | .bind(property.num_bathrooms)
| ^^^^^^^^^^^^^^^^^^^^^^ the trait `Encode<'_,sqlite>>
error[E0277]: the trait bound `u8: Type<_>` is not satisfied
--> src/db.rs:54:19
|
54 | .bind(property.num_bathrooms)
| ^^^^^^^^^^^^^^^^^^^^^^ the trait `Type<_>` is not implemented for `u8`
|
= note: required because of the requirements on the impl of `Type<_>` for `std::option::Option<u8>`
error[E0277]: the trait bound `std::option::Option<u8>: Encode<'_,_>` is not satisfied
--> src/db.rs:55:19
|
55 | .bind(property.num_garages)
| ^^^^^^^^^^^^^^^^^^^^ the trait `Encode<'_,sqlite>>
error[E0277]: the trait bound `u8: Type<_>` is not satisfied
--> src/db.rs:55:19
|
55 | .bind(property.num_garages)
| ^^^^^^^^^^^^^^^^^^^^ the trait `Type<_>` is not implemented for `u8`
|
= note: required because of the requirements on the impl of `Type<_>` for `std::option::Option<u8>`
error[E0277]: the trait bound `&mut PoolConnection<T>: sqlx::Executor<'_>` is not satisfied
--> src/db.rs:56:18
|
56 | .execute(&mut conn)
| ^^^^^^^^^ the trait `sqlx::Executor<'_>` is not implemented for `&mut PoolConnection<T>`
error: aborting due to 19 prevIoUs errors
For more information about this error,try `rustc --explain E0277`.
error: Could not compile `proj`
sqlx documentation 清楚地列出了我的所有类型作为 Encode 的实现。
为什么会这样？
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