[英]Create adapter for sqlx Value
I've generic trait in the app to convert results across different storage.我在应用程序中具有通用特征,可以跨不同存储转换结果。 Now I want to add support for SQLx.现在我想添加对 SQLx 的支持。 I want to keep it generic for all sqlx engines.我想让它对所有 sqlx 引擎保持通用。
Simplified example for i64: i64 的简化示例:
// My trait
pub trait TryConvert {
fn try_i64(&self) -> i64;
}
First impl try:首先实现尝试:
// Gives error
// the trait `sqlx::Decode<'_, DB>` is not implemented for `i64`
impl<DB, V> TryConvert for V
where
DB: Database,
V: Value<Database = DB>,
{
fn try_i64(&self) -> i64 {
self.try_decode_unchecked().unwrap()
}
}
Now with Decode
for i64:现在使用 i64 Decode
:
// Gives error:
// expected `sqlx::Decode<'_, DB>` found `sqlx::Decode<'a, DB>`
impl<'a, DB, V> TryConvert for V
where
DB: Database,
V: Value<Database = DB>,
i64: Decode<'a, DB>,
{
fn try_i64(&self) -> i64 {
self.try_decode_unchecked().unwrap()
}
}
But all work with concrete DB type:但都适用于具体的数据库类型:
impl<V> TryConvert for V
where
V: Value<Database = Sqlite>,
{
fn try_i64(&self) -> i64 {
self.try_decode_unchecked().unwrap()
}
}
Is it possible to keep the TryConvert
generic for any sqlx DB engines?是否可以为任何 sqlx 数据库引擎保持TryConvert
通用?
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.