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use super::on_conflict_actions::*;
use super::on_conflict_clause::*;
use super::on_conflict_target::*;
use query_builder::{AsChangeset, InsertStatement, UndecoratedInsertRecord};
use query_source::QuerySource;
impl<T, U, Op, Ret> InsertStatement<T, U, Op, Ret>
where
U: UndecoratedInsertRecord<T>,
{
/// Adds `ON CONFLICT DO NOTHING` to the insert statement, without
/// specifying any columns or constraints to restrict the conflict to.
///
/// # Examples
///
/// ### Single Record
///
/// ```rust
/// # #[macro_use] extern crate diesel;
/// # include!("on_conflict_docs_setup.rs");
/// #
/// # fn main() {
/// # use users::dsl::*;
/// # let conn = establish_connection();
/// # conn.execute("TRUNCATE TABLE users").unwrap();
/// let user = User { id: 1, name: "Sean", };
///
/// let inserted_row_count = diesel::insert_into(users)
/// .values(&user)
/// .on_conflict_do_nothing()
/// .execute(&conn);
/// assert_eq!(Ok(1), inserted_row_count);
///
/// let inserted_row_count = diesel::insert_into(users)
/// .values(&user)
/// .on_conflict_do_nothing()
/// .execute(&conn);
/// assert_eq!(Ok(0), inserted_row_count);
/// # }
/// ```
///
/// ### Vec of Records
///
/// ```rust
/// # #[macro_use] extern crate diesel;
/// # include!("on_conflict_docs_setup.rs");
/// #
/// # fn main() {
/// # use users::dsl::*;
/// # let conn = establish_connection();
/// # conn.execute("TRUNCATE TABLE users").unwrap();
/// let user = User { id: 1, name: "Sean", };
///
/// let inserted_row_count = diesel::insert_into(users)
/// .values(&vec![user, user])
/// .on_conflict_do_nothing()
/// .execute(&conn);
/// assert_eq!(Ok(1), inserted_row_count);
/// # }
/// ```
pub fn on_conflict_do_nothing(
self,
) -> InsertStatement<T, OnConflictValues<U, NoConflictTarget, DoNothing>, Op, Ret> {
self.replace_values(OnConflictValues::do_nothing)
}
/// Adds an `ON CONFLICT` to the insert statement, if a conflict occurs
/// for the given unique constraint.
///
/// `Target` can be one of:
///
/// - A column
/// - A tuple of columns
/// - [`on_constraint("constraint_name")`][`on_constraint`]
///
/// # Examples
///
/// ### Specifying a column as the target
///
/// ```rust
/// # #[macro_use] extern crate diesel;
/// # include!("on_conflict_docs_setup.rs");
/// #
/// # fn main() {
/// # use users::dsl::*;
/// # let conn = establish_connection();
/// # conn.execute("TRUNCATE TABLE users").unwrap();
/// conn.execute("CREATE UNIQUE INDEX users_name ON users (name)").unwrap();
/// let user = User { id: 1, name: "Sean", };
/// let same_name_different_id = User { id: 2, name: "Sean" };
/// let same_id_different_name = User { id: 1, name: "Pascal" };
///
/// assert_eq!(Ok(1), diesel::insert_into(users).values(&user).execute(&conn));
///
/// let inserted_row_count = diesel::insert_into(users)
/// .values(&same_name_different_id)
/// .on_conflict(name)
/// .do_nothing()
/// .execute(&conn);
/// assert_eq!(Ok(0), inserted_row_count);
///
/// let pk_conflict_result = diesel::insert_into(users)
/// .values(&same_id_different_name)
/// .on_conflict(name)
/// .do_nothing()
/// .execute(&conn);
/// assert!(pk_conflict_result.is_err());
/// # }
/// ```
///
/// ### Specifying multiple columns as the target
///
/// ```rust
/// # #[macro_use] extern crate diesel;
/// # include!("../../doctest_setup.rs");
/// #
/// # table! {
/// # users {
/// # id -> Integer,
/// # name -> VarChar,
/// # hair_color -> VarChar,
/// # }
/// # }
/// #
/// # #[derive(Clone, Copy, Insertable)]
/// # #[table_name="users"]
/// # struct User<'a> {
/// # id: i32,
/// # name: &'a str,
/// # hair_color: &'a str,
/// # }
/// #
/// # fn main() {
/// # use users::dsl::*;
/// use diesel::pg::upsert::*;
///
/// # let conn = establish_connection();
/// # conn.execute("DROP TABLE users").unwrap();
/// # conn.execute("CREATE TABLE users (id SERIAL PRIMARY KEY, name TEXT, hair_color TEXT)").unwrap();
/// conn.execute("CREATE UNIQUE INDEX users_name_hair_color ON users (name, hair_color)").unwrap();
/// let user = User { id: 1, name: "Sean", hair_color: "black" };
/// let same_name_different_hair_color = User { id: 2, name: "Sean", hair_color: "brown" };
/// let same_name_same_hair_color = User { id: 3, name: "Sean", hair_color: "black" };
///
/// assert_eq!(Ok(1), diesel::insert_into(users).values(&user).execute(&conn));
///
/// let inserted_row_count = diesel::insert_into(users)
/// .values(&same_name_different_hair_color)
/// .on_conflict((name, hair_color))
/// .do_nothing()
/// .execute(&conn);
/// assert_eq!(Ok(1), inserted_row_count);
///
/// let inserted_row_count = diesel::insert_into(users)
/// .values(&same_name_same_hair_color)
/// .on_conflict((name, hair_color))
/// .do_nothing()
/// .execute(&conn);
/// assert_eq!(Ok(0), inserted_row_count);
/// # }
/// ```
///
/// See the documentation for [`on_constraint`] and [`do_update`] for
/// more examples.
///
/// [`on_constraint`]: ../pg/upsert/fn.on_constraint.html
/// [`do_update`]: ../pg/upsert/struct.IncompleteOnConflict.html#method.do_update
pub fn on_conflict<Target>(
self,
target: Target,
) -> IncompleteOnConflict<Self, ConflictTarget<Target>>
where
ConflictTarget<Target>: OnConflictTarget<T>,
{
IncompleteOnConflict {
stmt: self,
target: ConflictTarget(target),
}
}
}
/// A partially constructed `ON CONFLICT` clause.
#[derive(Debug, Clone, Copy)]
pub struct IncompleteOnConflict<Stmt, Target> {
stmt: Stmt,
target: Target,
}
impl<T, U, Op, Ret, Target> IncompleteOnConflict<InsertStatement<T, U, Op, Ret>, Target> {
/// Creates a query with `ON CONFLICT (target) DO NOTHING`
///
/// If you want to do nothing when *any* constraint conflicts, use
/// [`on_conflict_do_nothing`] instead. See [`on_conflict`] for usage
/// examples.
///
/// [`on_conflict_do_nothing`]: ../../query_builder/struct.InsertStatement.html#method.on_conflict_do_nothing
/// [`on_conflict`]: ../../query_builder/struct.InsertStatement.html#method.on_conflict
pub fn do_nothing(self) -> InsertStatement<T, OnConflictValues<U, Target, DoNothing>, Op, Ret> {
let target = self.target;
self.stmt
.replace_values(|values| OnConflictValues::new(values, target, DoNothing))
}
}
impl<Stmt, Target> IncompleteOnConflict<Stmt, Target> {
/// Used to create a query in the form `ON CONFLICT (...) DO UPDATE ...`
///
/// Call `.set` on the result of this function with the changes you want to
/// apply. The argument to `set` can be anything that implements `AsChangeset`
/// (e.g. anything you could pass to `set` on a normal update statement).
///
/// Note: When inserting more than one row at a time, this query can still fail
/// if the rows being inserted conflict with each other.
///
/// # Examples
///
/// ## Set specific value on conflict
///
/// ```rust
/// # #[macro_use] extern crate diesel;
/// # include!("on_conflict_docs_setup.rs");
/// #
/// # fn main() {
/// # use users::dsl::*;
/// # let conn = establish_connection();
/// # conn.execute("TRUNCATE TABLE users").unwrap();
/// let user = User { id: 1, name: "Pascal" };
/// let user2 = User { id: 1, name: "Sean" };
///
/// assert_eq!(Ok(1), diesel::insert_into(users).values(&user).execute(&conn));
///
/// let insert_count = diesel::insert_into(users)
/// .values(&user2)
/// .on_conflict(id)
/// .do_update()
/// .set(name.eq("I DONT KNOW ANYMORE"))
/// .execute(&conn);
/// assert_eq!(Ok(1), insert_count);
///
/// let users_in_db = users.load(&conn);
/// assert_eq!(Ok(vec![(1, "I DONT KNOW ANYMORE".to_string())]), users_in_db);
/// # }
/// ```
///
/// ## Set `AsChangeset` struct on conflict
///
/// ```rust
/// # #[macro_use] extern crate diesel;
/// # include!("on_conflict_docs_setup.rs");
/// #
/// # fn main() {
/// # use users::dsl::*;
/// # let conn = establish_connection();
/// # conn.execute("TRUNCATE TABLE users").unwrap();
/// let user = User { id: 1, name: "Pascal" };
/// let user2 = User { id: 1, name: "Sean" };
///
/// assert_eq!(Ok(1), diesel::insert_into(users).values(&user).execute(&conn));
///
/// let insert_count = diesel::insert_into(users)
/// .values(&user2)
/// .on_conflict(id)
/// .do_update()
/// .set(&user2)
/// .execute(&conn);
/// assert_eq!(Ok(1), insert_count);
///
/// let users_in_db = users.load(&conn);
/// assert_eq!(Ok(vec![(1, "Sean".to_string())]), users_in_db);
/// # }
/// ```
///
/// ## Use `excluded` to get the rejected value
///
/// ```rust
/// # #[macro_use] extern crate diesel;
/// # include!("on_conflict_docs_setup.rs");
/// #
/// # fn main() {
/// # use users::dsl::*;
/// use diesel::pg::upsert::excluded;
///
/// # let conn = establish_connection();
/// # conn.execute("TRUNCATE TABLE users").unwrap();
/// let user = User { id: 1, name: "Pascal" };
/// let user2 = User { id: 1, name: "Sean" };
/// let user3 = User { id: 2, name: "Tess" };
///
/// assert_eq!(Ok(1), diesel::insert_into(users).values(&user).execute(&conn));
///
/// let insert_count = diesel::insert_into(users)
/// .values(&vec![user2, user3])
/// .on_conflict(id)
/// .do_update()
/// .set(name.eq(excluded(name)))
/// .execute(&conn);
/// assert_eq!(Ok(2), insert_count);
///
/// let users_in_db = users.load(&conn);
/// assert_eq!(Ok(vec![(1, "Sean".to_string()), (2, "Tess".to_string())]), users_in_db);
/// # }
/// ```
pub fn do_update(self) -> IncompleteDoUpdate<Stmt, Target> {
IncompleteDoUpdate {
stmt: self.stmt,
target: self.target,
}
}
}
/// A partially constructed `ON CONFLICT DO UPDATE` clause.
#[derive(Debug, Clone, Copy)]
pub struct IncompleteDoUpdate<Stmt, Target> {
stmt: Stmt,
target: Target,
}
impl<T, U, Op, Ret, Target> IncompleteDoUpdate<InsertStatement<T, U, Op, Ret>, Target> {
/// See [`do_update`] for usage examples.
///
/// [`do_update`]: struct.IncompleteOnConflict.html#method.do_update
pub fn set<Changes>(
self,
changes: Changes,
) -> InsertStatement<T, OnConflictValues<U, Target, DoUpdate<Changes::Changeset>>, Op, Ret>
where
T: QuerySource,
Changes: AsChangeset<Target = T>,
{
let target = self.target;
self.stmt.replace_values(|values| {
OnConflictValues::new(values, target, DoUpdate::new(changes.as_changeset()))
})
}
}