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use self::private::TextOrNullableText;
use crate::dsl;
use crate::expression::grouped::Grouped;
use crate::expression::operators::{Concat, Like, NotLike};
use crate::expression::{AsExpression, Expression};
use crate::sql_types::SqlType;
/// Methods present on text expressions
pub trait TextExpressionMethods: Expression + Sized {
/// Concatenates two strings using the `||` operator.
///
/// # Example
///
/// ```rust
/// # include!("../doctest_setup.rs");
/// #
/// # table! {
/// # users {
/// # id -> Integer,
/// # name -> VarChar,
/// # hair_color -> Nullable<Text>,
/// # }
/// # }
/// #
/// # fn main() {
/// # use self::users::dsl::*;
/// # use diesel::insert_into;
/// #
/// # let connection = &mut connection_no_data();
/// # diesel::sql_query("CREATE TEMPORARY TABLE users (
/// # id INTEGER PRIMARY KEY,
/// # name VARCHAR(255) NOT NULL,
/// # hair_color VARCHAR(255)
/// # )").execute(connection).unwrap();
/// #
/// # insert_into(users)
/// # .values(&vec![
/// # (id.eq(1), name.eq("Sean"), hair_color.eq(Some("Green"))),
/// # (id.eq(2), name.eq("Tess"), hair_color.eq(None)),
/// # ])
/// # .execute(connection)
/// # .unwrap();
/// #
/// let names = users.select(name.concat(" the Greatest")).load(connection);
/// let expected_names = vec![
/// "Sean the Greatest".to_string(),
/// "Tess the Greatest".to_string(),
/// ];
/// assert_eq!(Ok(expected_names), names);
///
/// // If the value is nullable, the output will be nullable
/// let names = users.select(hair_color.concat("ish")).load(connection);
/// let expected_names = vec![Some("Greenish".to_string()), None];
/// assert_eq!(Ok(expected_names), names);
/// # }
/// ```
fn concat<T>(self, other: T) -> dsl::Concat<Self, T>
where
Self::SqlType: SqlType,
T: AsExpression<Self::SqlType>,
{
Grouped(Concat::new(self, other.as_expression()))
}
/// Returns a SQL `LIKE` expression
///
/// This method is case insensitive for SQLite and MySQL.
/// On PostgreSQL, `LIKE` is case sensitive. You may use
/// [`ilike()`](../expression_methods/trait.PgTextExpressionMethods.html#method.ilike)
/// for case insensitive comparison on PostgreSQL.
///
/// # Examples
///
/// ```rust
/// # include!("../doctest_setup.rs");
/// #
/// # fn main() {
/// # run_test().unwrap();
/// # }
/// #
/// # fn run_test() -> QueryResult<()> {
/// # use schema::users::dsl::*;
/// # let connection = &mut establish_connection();
/// #
/// let starts_with_s = users
/// .select(name)
/// .filter(name.like("S%"))
/// .load::<String>(connection)?;
/// assert_eq!(vec!["Sean"], starts_with_s);
/// # Ok(())
/// # }
/// ```
fn like<T>(self, other: T) -> dsl::Like<Self, T>
where
Self::SqlType: SqlType,
T: AsExpression<Self::SqlType>,
{
Grouped(Like::new(self, other.as_expression()))
}
/// Returns a SQL `NOT LIKE` expression
///
/// This method is case insensitive for SQLite and MySQL.
/// On PostgreSQL `NOT LIKE` is case sensitive. You may use
/// [`not_ilike()`](../expression_methods/trait.PgTextExpressionMethods.html#method.not_ilike)
/// for case insensitive comparison on PostgreSQL.
///
/// # Examples
///
/// ```rust
/// # include!("../doctest_setup.rs");
/// #
/// # fn main() {
/// # run_test().unwrap();
/// # }
/// #
/// # fn run_test() -> QueryResult<()> {
/// # use schema::users::dsl::*;
/// # let connection = &mut establish_connection();
/// #
/// let doesnt_start_with_s = users
/// .select(name)
/// .filter(name.not_like("S%"))
/// .load::<String>(connection)?;
/// assert_eq!(vec!["Tess"], doesnt_start_with_s);
/// # Ok(())
/// # }
/// ```
fn not_like<T>(self, other: T) -> dsl::NotLike<Self, T>
where
Self::SqlType: SqlType,
T: AsExpression<Self::SqlType>,
{
Grouped(NotLike::new(self, other.as_expression()))
}
}
impl<T> TextExpressionMethods for T
where
T: Expression,
T::SqlType: TextOrNullableText,
{
}
mod private {
use crate::sql_types::{Nullable, Text};
/// Marker trait used to implement `TextExpressionMethods` on the appropriate
/// types. Once coherence takes associated types into account, we can remove
/// this trait.
pub trait TextOrNullableText {}
impl TextOrNullableText for Text {}
impl TextOrNullableText for Nullable<Text> {}
#[cfg(feature = "postgres_backend")]
impl TextOrNullableText for crate::pg::sql_types::Citext {}
#[cfg(feature = "postgres_backend")]
impl TextOrNullableText for Nullable<crate::pg::sql_types::Citext> {}
}