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use std::mem; use std::rc; use std::marker; use std::fmt; use super::select_query; use super::insert_query::{self, ToInsertValue}; use super::from; use super::predicate; use super::expression; use super::sql; use super::field; pub trait FieldUpd: sql::ToSql + fmt::Debug { fn upcast_field_update(&self) -> SharedFieldUpdate; } #[derive(Clone, Debug)] pub struct FieldUpdate<F, T: fmt::Debug> { pub field: F, pub value: insert_query::InsertValue<T> } impl<F, T: fmt::Debug> FieldUpdate<F, T> { pub fn get_field(&self) -> &F { &self.field } pub fn get_value(&self) -> &insert_query::InsertValue<T> { &self.value } } type BoxedFieldUpdate = Box<FieldUpd + 'static>; type SharedFieldUpdate = rc::Rc<BoxedFieldUpdate>; impl<F, T> FieldUpd for FieldUpdate<F, T> where F: Clone + sql::ToPredicateValue + 'static, T: Clone + sql::ToPredicateValue + 'static { fn upcast_field_update(&self) -> SharedFieldUpdate { rc::Rc::new(Box::new(self.clone())) } } pub trait ToFieldUpdate<F, T: fmt::Debug> { fn set<B: expression::ToExpression<T>>(&self, val: &B) -> FieldUpdate<F, T>; fn set_default(&self) -> FieldUpdate<F, T>; } impl<T> ToFieldUpdate<field::NamedField<T>, T> for field::NamedField<T> where T: Clone + fmt::Debug { fn set<B: expression::ToExpression<T>>(&self, val: &B) -> FieldUpdate<field::NamedField<T>, T> { FieldUpdate { field: self.clone(), value: val.as_expr().to_insert_val() } } fn set_default(&self) -> FieldUpdate<field::NamedField<T>, T> { FieldUpdate { field: self.clone(), value: insert_query::InsertValue::Default } } } impl ToFieldUpdate<expression::RawExpression, expression::RawExpression> for expression::RawExpression { fn set<B: expression::ToExpression<expression::RawExpression>>(&self, val: &B) -> FieldUpdate<expression::RawExpression, expression::RawExpression> { FieldUpdate { field: self.clone(), value: val.as_expr().to_insert_val() } } fn set_default(&self) -> FieldUpdate<expression::RawExpression, expression::RawExpression> { FieldUpdate { field: self.clone(), value: insert_query::InsertValue::Default } } } pub trait Updatable<M>: from::Table + Sized { fn update(&self) -> UpdateQuery<(), select_query::NoResult, M> { UpdateQuery::new(self) } } #[derive(Clone, Debug)] pub struct UpdateQuery<T, L, M> { only: bool, table: from::SharedTable, updates: Vec<SharedFieldUpdate>, from: Option<Vec<from::SharedFrom>>, where_: Option<predicate::SharedPredicate>, all: bool, returning: Option<select_query::Select>, _marker_t: marker::PhantomData<T>, _marker_l: marker::PhantomData<L>, _marker_m: marker::PhantomData<M> } impl<T, L, M> UpdateQuery<T, L, M> { pub fn is_only(&self) -> bool { self.only } pub fn is_all(&self) -> bool { self.all } pub fn get_table(&self) -> &from::SharedTable { &self.table } pub fn get_updates(&self) -> &Vec<SharedFieldUpdate> { &self.updates } pub fn get_from(&self) -> &Option<Vec<from::SharedFrom>> { &self.from } pub fn get_where(&self) -> &Option<predicate::SharedPredicate> { &self.where_ } pub fn get_returning(&self) -> &Option<select_query::Select> { &self.returning } } impl<T, L, M> UpdateQuery<T, L, M> { pub fn new(table: &from::Table) -> UpdateQuery<T, L, M> { UpdateQuery { only: false, table: table.upcast_table(), updates: vec![], from: None, where_: None, all: false, returning: None, _marker_t: marker::PhantomData, _marker_l: marker::PhantomData, _marker_m: marker::PhantomData, } } pub fn only(mut self) -> UpdateQuery<T, L, M> { self.only = true; self } pub fn from(mut self, from: &from::From) -> UpdateQuery<T, L, M> { if self.from.is_none() { self.from = Some(vec![]) } self.from.as_mut().unwrap().push(from.upcast_from()); self } pub fn field<F: FieldUpd>(mut self, update: F) -> UpdateQuery<T, L, M> { self.updates.push(update.upcast_field_update()); self } pub fn all(mut self) -> UpdateQuery<T, L, M> { self.where_ = None; self.all = true; self } } returning_for!(UpdateQuery); impl<T:Clone, L:Clone, M:Clone> select_query::Queryable for UpdateQuery<T, L, M> { fn get_where(&self) -> &Option<predicate::SharedPredicate> { &self.where_ } fn set_where(&mut self, predicate: predicate::SharedPredicate) { self.where_ = Some(predicate); } fn unset_where(&mut self) { self.where_ = None; } }