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use expression::Expression; use super::{UpdateTarget, IncompleteUpdateStatement, IncompleteInsertStatement, SelectStatement}; use super::delete_statement::DeleteStatement; /// Creates an update statement. Helpers for updating a single row can be /// generated by /// [`#[changeset_for]`](https://github.com/sgrif/diesel/tree/master/diesel_codegen#changeset_fortable_name). /// /// # Examples /// /// ### Updating a single record: /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("src/doctest_setup.rs"); /// # /// # table! { /// # users { /// # id -> Integer, /// # name -> VarChar, /// # } /// # } /// # /// # #[cfg(feature = "postgres")] /// # fn main() { /// # use self::users::dsl::*; /// # let connection = establish_connection(); /// let updated_row = diesel::update(users.filter(id.eq(1))) /// .set(name.eq("James")) /// .get_result(&connection); /// // On backends that support it, you can call `get_result` instead of `execute` /// // to have `RETURNING *` automatically appended to the query. /// assert_eq!(Ok((1, "James".to_string())), updated_row); /// # } /// # #[cfg(not(feature = "postgres"))] /// # fn main() {} /// ``` pub fn update<T: UpdateTarget>(source: T) -> IncompleteUpdateStatement<T> { IncompleteUpdateStatement::new(source) } /// Creates a delete statement. Will delete the records in the given set. /// Because this function has a very generic name, it is not exported by /// default. /// /// # Examples /// /// ### Deleting a single record: /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("src/doctest_setup.rs"); /// # /// # table! { /// # users { /// # id -> Integer, /// # name -> VarChar, /// # } /// # } /// # /// # fn main() { /// # delete(); /// # } /// # /// # fn delete() -> QueryResult<()> { /// # use self::users::dsl::*; /// # let connection = establish_connection(); /// # let get_count = || users.count().first::<i64>(&connection); /// let old_count = get_count(); /// try!(diesel::delete(users.filter(id.eq(1))).execute(&connection)); /// assert_eq!(old_count.map(|count| count - 1), get_count()); /// # Ok(()) /// # } /// ``` /// /// ### Deleting a whole table: /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("src/doctest_setup.rs"); /// # /// # table! { /// # users { /// # id -> Integer, /// # name -> VarChar, /// # } /// # } /// # /// # fn main() { /// # delete(); /// # } /// # /// # fn delete() -> QueryResult<()> { /// # use self::users::dsl::*; /// # let connection = establish_connection(); /// # let get_count = || users.count().first::<i64>(&connection); /// try!(diesel::delete(users).execute(&connection)); /// assert_eq!(Ok(0), get_count()); /// # Ok(()) /// # } /// ``` pub fn delete<T: UpdateTarget>(source: T) -> DeleteStatement<T> { DeleteStatement::new(source) } /// Creates an insert statement. Will add the given data to a table. This /// function is not exported by default. As with other commands, the resulting /// query can return the inserted rows if you choose. pub fn insert<T>(records: T) -> IncompleteInsertStatement<T> { IncompleteInsertStatement::new(records) } /// Creates a bare select statement, with no from clause. Primarily used for /// testing diesel itself, but likely useful for third party crates as well. The /// given expressions must be selectable from anywhere. pub fn select<T>(expression: T) -> SelectStatement<T::SqlType, T, ()> where T: Expression, { SelectStatement::simple(expression, ()) }