derive_sql/selectable/
simplelimit.rs

1use super::*;
2
3pub struct SimpleLimit {
4  limit: Option<usize>,
5  next: Option<Box<dyn Selectable>>,
6}
7
8impl SimpleLimit {
9  pub fn and(mut self, next: Box<dyn Selectable>) -> SimpleLimit { self.next = Some(next); self }
10}
11
12impl Selectable for SimpleLimit {
13  fn filter(&self) -> Option<String> { self.next.as_ref().and_then(|n| n.filter()) }
14  fn limit(&self) -> Option<usize> { self.limit.as_ref().cloned() }
15  fn offset(&self) -> Option<usize> { self.next.as_ref().and_then(|n| n.offset()) }
16  fn order_by(&self) -> Option<String> { self.next.as_ref().and_then(|n| n.order_by()) }
17}
18
19impl std::convert::TryFrom<()> for SimpleLimit {
20  type Error = Box<dyn std::error::Error>;
21  fn try_from(_: ()) -> std::result::Result<Self, Self::Error> {
22    Ok(SimpleLimit { limit: None, next: None })
23  }
24}
25
26impl std::convert::TryFrom<usize> for SimpleLimit {
27  type Error = Box<dyn std::error::Error>;
28  fn try_from(v: usize) -> std::result::Result<Self, Self::Error> {
29    Ok(SimpleLimit { limit: Some(v), next: None})
30  }
31}
32
derive_sql/selectable/simplelimit.rs

derive_sql/selectable/
simplelimit.rs
