作为Input的trait
Entity特征用于insert操作
```rust
pub trait Entity<DB: Database> {
// sql generation
fn gen_insert_sql<'a>(&self)-> Cow<'a, str>;
fn gen_upsert_sql<'a>(&self)-> Cow<'a, str>;
fn gen_create_sql<'a>(&self)-> Cow<'a, str>;
// sqlx arguments generation, create is same as insert
fn add_insert_args(&self, args: &mut DB::Arguments<'_>);
fn add_upsert_args(&self, args: &mut DB::Arguments<'_>);
fn gen_insert_args(&self) -> DB::Arguments<'_>;
fn gen_upsert_args(&self) -> DB::Arguments<'_>;
}
```
Mutation特征用于update操作
```rust
trait Mutation {
fn update_sql();
fn update_args();
}
trait Location {
fn where_sql();
fn where_args();
}
trait Unique {
fn where_sql();
fn where_args();
}
trait TemplateRecord {
fn template_sql();
fn template_args();
}
```
作为output的trait
```rust
trait Selected {}
```
```rust
trait Location {
}
```