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//! PostgreSQL specific expression methods use expression::{AsExpression, Expression}; use super::operators::*; use types::{Array, Text}; /// PostgreSQL expression methods which are not type specific. /// /// This trait is implemented for all types that implement `Expression`. pub trait PgExpressionMethods: Expression + Sized { /// Creates a PostgreSQL `IS NOT DISTINCT FROM` expression. This behaves /// identically to the `=` operator, except that `NULL` is treated as a /// normal value. /// /// # Example /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("../../doctest_setup.rs"); /// # /// # table! { /// # users { /// # id -> Integer, /// # name -> VarChar, /// # } /// # } /// # /// # fn main() { /// # use self::users::dsl::*; /// # let connection = establish_connection(); /// let distinct = users.select(id).filter(name.is_distinct_from("Sean")); /// let not_distinct = users.select(id).filter(name.is_not_distinct_from("Sean")); /// assert_eq!(Ok(2), distinct.first(&connection)); /// assert_eq!(Ok(1), not_distinct.first(&connection)); /// # } /// ``` fn is_not_distinct_from<T>(self, other: T) -> IsNotDistinctFrom<Self, T::Expression> where T: AsExpression<Self::SqlType>, { IsNotDistinctFrom::new(self, other.as_expression()) } /// Creates a PostgreSQL `IS DISTINCT FROM` expression. This behaves /// identically to the `!=` operator, except that `NULL` is treated as a /// normal value. /// /// # Example /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("../../doctest_setup.rs"); /// # /// # table! { /// # users { /// # id -> Integer, /// # name -> VarChar, /// # } /// # } /// # /// # fn main() { /// # use self::users::dsl::*; /// # let connection = establish_connection(); /// let distinct = users.select(id).filter(name.is_distinct_from("Sean")); /// let not_distinct = users.select(id).filter(name.is_not_distinct_from("Sean")); /// assert_eq!(Ok(2), distinct.first(&connection)); /// assert_eq!(Ok(1), not_distinct.first(&connection)); /// # } /// ``` fn is_distinct_from<T>(self, other: T) -> IsDistinctFrom<Self, T::Expression> where T: AsExpression<Self::SqlType>, { IsDistinctFrom::new(self, other.as_expression()) } } impl<T: Expression> PgExpressionMethods for T {} use super::date_and_time::{AtTimeZone, DateTimeLike}; use types::VarChar; /// PostgreSQL expression methods related to timestamps. /// /// This trait is implemented for all types that implement `Expression` where /// the `SqlType` is either `Timestamp` or `Timestamptz` pub trait PgTimestampExpressionMethods: Expression + Sized { /// Returns a PostgreSQL "AT TIME ZONE" expression fn at_time_zone<T>(self, timezone: T) -> AtTimeZone<Self, T::Expression> where T: AsExpression<VarChar>, { AtTimeZone::new(self, timezone.as_expression()) } } impl<T: Expression> PgTimestampExpressionMethods for T where T::SqlType: DateTimeLike, { } /// PostgreSQL expression methods related to arrays. /// /// This trait is implemented for all types that implement `Expression` where /// the `SqlType` is `Array`. pub trait ArrayExpressionMethods<ST>: Expression<SqlType = Array<ST>> + Sized { /// Compares two arrays for common elements, using the `&&` operator in /// the final SQL /// /// # Example /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("../../doctest_setup.rs"); /// # use schema::users; /// # /// # table! { /// # posts { /// # id -> Integer, /// # tags -> Array<VarChar>, /// # } /// # } /// # /// # #[derive(Insertable)] /// # #[table_name="posts"] /// # struct NewPost<'a> { tags: Vec<&'a str> } /// # /// # fn main() { /// # use self::posts::dsl::*; /// # let conn = establish_connection(); /// # conn.execute("DROP TABLE IF EXISTS posts").unwrap(); /// # conn.execute("CREATE TABLE posts (id SERIAL PRIMARY KEY, tags TEXT[] NOT NULL)").unwrap(); /// # /// diesel::insert_into(posts) /// .values(&vec![ /// NewPost { tags: vec!["cool", "awesome"] }, /// NewPost { tags: vec!["awesome", "great"] }, /// NewPost { tags: vec!["cool", "great"] }, /// ]) /// .execute(&conn) /// .unwrap(); /// /// let query = posts.select(id).filter(tags.overlaps_with(vec!["horrid", "cool"])); /// assert_eq!(Ok(vec![1, 3]), query.load(&conn)); /// /// let query = posts.select(id).filter(tags.overlaps_with(vec!["cool", "great"])); /// assert_eq!(Ok(vec![1, 2, 3]), query.load(&conn)); /// /// let query = posts.select(id).filter(tags.overlaps_with(vec!["horrid"])); /// assert_eq!(Ok(Vec::new()), query.load::<i32>(&conn)); /// # } /// ``` fn overlaps_with<T>(self, other: T) -> OverlapsWith<Self, T::Expression> where T: AsExpression<Self::SqlType>, { OverlapsWith::new(self, other.as_expression()) } /// Compares whether an array contains another array, using the `@>` operator. /// /// # Example /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("../../doctest_setup.rs"); /// # use schema::users; /// # /// # table! { /// # posts { /// # id -> Integer, /// # tags -> Array<VarChar>, /// # } /// # } /// # /// # #[derive(Insertable)] /// # #[table_name="posts"] /// # struct NewPost<'a> { tags: Vec<&'a str> } /// # /// # fn main() { /// # use self::posts::dsl::*; /// # let conn = establish_connection(); /// # conn.execute("DROP TABLE IF EXISTS posts").unwrap(); /// # conn.execute("CREATE TABLE posts (id SERIAL PRIMARY KEY, tags TEXT[] NOT NULL)").unwrap(); /// # /// diesel::insert_into(posts) /// .values(&vec![ /// NewPost { tags: vec!["cool", "awesome"] }, /// ]) /// .execute(&conn) /// .unwrap(); /// /// let query = posts.select(id).filter(tags.contains(vec!["cool"])); /// assert_eq!(Ok(vec![1]), query.load(&conn)); /// /// let query = posts.select(id).filter(tags.contains(vec!["cool", "amazing"])); /// assert_eq!(Ok(Vec::new()), query.load::<i32>(&conn)); /// # } /// ``` fn contains<T>(self, other: T) -> Contains<Self, T::Expression> where T: AsExpression<Self::SqlType>, { Contains::new(self, other.as_expression()) } /// Compares whether an array is contained by another array, using the `<@` operator. /// This is the opposite of `contains` /// /// # Example /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("../../doctest_setup.rs"); /// # use schema::users; /// # /// # table! { /// # posts { /// # id -> Integer, /// # tags -> Array<VarChar>, /// # } /// # } /// # /// # #[derive(Insertable)] /// # #[table_name="posts"] /// # struct NewPost<'a> { tags: Vec<&'a str> } /// # /// # fn main() { /// # use self::posts::dsl::*; /// # let conn = establish_connection(); /// # conn.execute("DROP TABLE IF EXISTS posts").unwrap(); /// # conn.execute("CREATE TABLE posts (id SERIAL PRIMARY KEY, tags TEXT[] NOT NULL)").unwrap(); /// # /// diesel::insert_into(posts) /// .values(&vec![ /// NewPost { tags: vec!["cool", "awesome"] }, /// ]) /// .execute(&conn) /// .unwrap(); /// /// let query = posts.select(id).filter(tags.is_contained_by(vec!["cool", "awesome", "amazing"])); /// assert_eq!(Ok(vec![1]), query.load(&conn)); /// /// let query = posts.select(id).filter(tags.is_contained_by(vec!["cool"])); /// assert_eq!(Ok(Vec::new()), query.load::<i32>(&conn)); /// # } /// ``` fn is_contained_by<T>(self, other: T) -> IsContainedBy<Self, T::Expression> where T: AsExpression<Self::SqlType>, { IsContainedBy::new(self, other.as_expression()) } } impl<T, ST> ArrayExpressionMethods<ST> for T where T: Expression<SqlType = Array<ST>>, { } use expression::operators::{Asc, Desc}; /// PostgreSQL expression methods related to sorting. /// /// This trait is only implemented for `Asc` and `Desc`. Although `.asc` is /// implicit if no order is given, you will need to call `.asc()` explicitly in /// order to call these methods. pub trait SortExpressionMethods: Sized { /// Specify that nulls should come before other values in this ordering. /// Normally, nulls come last when sorting in ascending order and first /// when sorting in descending order. /// /// # Example /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("../../doctest_setup.rs"); /// # /// # table! { /// # users { /// # id -> Integer, /// # name -> VarChar, /// # } /// # } /// # /// # table! { /// # foos { /// # id -> Integer, /// # foo -> Nullable<Integer>, /// # } /// # } /// # /// # fn main() { /// # let connection = connection_no_data(); /// # connection.execute("DROP TABLE IF EXISTS foos").unwrap(); /// connection.execute("CREATE TABLE foos (id SERIAL PRIMARY KEY, foo INTEGER)").unwrap(); /// connection.execute("INSERT INTO foos (foo) VALUES (NULL), (1), (2)").unwrap(); /// /// # use self::foos::dsl::*; /// assert_eq!(Ok(vec![Some(1), Some(2), None]), /// foos.select(foo).order(foo.asc()).load(&connection)); /// assert_eq!(Ok(vec![None, Some(1), Some(2)]), /// foos.select(foo).order(foo.asc().nulls_first()).load(&connection)); /// # connection.execute("DROP TABLE foos").unwrap(); /// # } /// ``` fn nulls_first(self) -> NullsFirst<Self> { NullsFirst::new(self) } /// Specify that nulls should come after other values in this ordering. /// Normally, nulls come last when sorting in ascending order and first /// when sorting in descending order. /// /// # Example /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("../../doctest_setup.rs"); /// # /// # table! { /// # users { /// # id -> Integer, /// # name -> VarChar, /// # } /// # } /// # /// # table! { /// # foos { /// # id -> Integer, /// # foo -> Nullable<Integer>, /// # } /// # } /// # /// # fn main() { /// # let connection = connection_no_data(); /// # connection.execute("DROP TABLE IF EXISTS foos").unwrap(); /// connection.execute("CREATE TABLE foos (id SERIAL PRIMARY KEY, foo INTEGER)").unwrap(); /// connection.execute("INSERT INTO foos (foo) VALUES (NULL), (1), (2)").unwrap(); /// /// # use self::foos::dsl::*; /// assert_eq!(Ok(vec![None, Some(2), Some(1)]), /// foos.select(foo).order(foo.desc()).load(&connection)); /// assert_eq!(Ok(vec![Some(2), Some(1), None]), /// foos.select(foo).order(foo.desc().nulls_last()).load(&connection)); /// # connection.execute("DROP TABLE foos").unwrap(); /// # } /// ``` fn nulls_last(self) -> NullsLast<Self> { NullsLast::new(self) } } impl<T> SortExpressionMethods for Asc<T> {} impl<T> SortExpressionMethods for Desc<T> {} /// PostgreSQL expression methods related to text. /// /// This trait is implemented for all types that implement `Expression` where /// the `SqlType` is `Text` pub trait PgTextExpressionMethods: Expression<SqlType = Text> + Sized { /// Returns a SQL `ILIKE` expression /// /// # Example /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("../../doctest_setup.rs"); /// # use schema::users; /// # /// # fn main() { /// # use schema::users::dsl::*; /// # let connection = establish_connection(); /// # /// let like_sean = users /// .select(name) /// .filter(name.ilike("sean")) /// .get_results::<String>(&connection) /// .expect("Failed"); /// /// let expected = vec!["Sean".to_string()]; /// /// assert_eq!(expected, like_sean); /// # } /// ``` fn ilike<T: AsExpression<Text>>(self, other: T) -> ILike<Self, T::Expression> { ILike::new(self.as_expression(), other.as_expression()) } /// Returns a SQL `NOT ILIKE` expression /// /// # Example /// /// ```rust /// # #[macro_use] extern crate diesel; /// # include!("../../doctest_setup.rs"); /// # use schema::users; /// # /// # fn main() { /// # use schema::users::dsl::*; /// # let connection = establish_connection(); /// # /// let not_like_sean = users /// .select(name) /// .filter(name.not_ilike("sean")) /// .get_results::<String>(&connection) /// .expect("Failed"); /// /// let expected = vec!["Tess".to_string()]; /// /// assert_eq!(expected, not_like_sean); /// # } /// ``` fn not_ilike<T: AsExpression<Text>>(self, other: T) -> NotILike<Self, T::Expression> { NotILike::new(self.as_expression(), other.as_expression()) } } impl<T: Expression<SqlType = Text>> PgTextExpressionMethods for T {}