Enum sea_query::expr::SimpleExpr [−][src]
Represents a Simple Expression in SQL.
SimpleExpr
is a node in the expression tree and can represent identifiers, function calls,
various operators and sub-queries.
Variants
Unary(UnOper, Box<SimpleExpr>)
FunctionCall(Function, Vec<SimpleExpr>)
Binary(Box<SimpleExpr>, BinOper, Box<SimpleExpr>)
SubQuery(Box<SelectStatement>)
Value(Value)
Custom(String)
Implementations
impl SimpleExpr
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pub fn and(self, right: SimpleExpr) -> Self
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Express a logical AND
operation.
Examples
use sea_query::{*, tests_cfg::*}; let query = Query::select() .columns(vec![Char::Character, Char::SizeW, Char::SizeH]) .from(Char::Table) .or_where(Expr::col(Char::SizeW).eq(1).and(Expr::col(Char::SizeH).eq(2))) .or_where(Expr::col(Char::SizeW).eq(3).and(Expr::col(Char::SizeH).eq(4))) .to_owned(); assert_eq!( query.to_string(MysqlQueryBuilder), r#"SELECT `character`, `size_w`, `size_h` FROM `character` WHERE ((`size_w` = 1) AND (`size_h` = 2)) OR ((`size_w` = 3) AND (`size_h` = 4))"# ); assert_eq!( query.to_string(PostgresQueryBuilder), r#"SELECT "character", "size_w", "size_h" FROM "character" WHERE (("size_w" = 1) AND ("size_h" = 2)) OR (("size_w" = 3) AND ("size_h" = 4))"# ); assert_eq!( query.to_string(SqliteQueryBuilder), r#"SELECT `character`, `size_w`, `size_h` FROM `character` WHERE ((`size_w` = 1) AND (`size_h` = 2)) OR ((`size_w` = 3) AND (`size_h` = 4))"# );
pub fn or(self, right: SimpleExpr) -> Self
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Express a logical OR
operation.
Examples
use sea_query::{*, tests_cfg::*}; let query = Query::select() .columns(vec![Char::Character, Char::SizeW, Char::SizeH]) .from(Char::Table) .and_where(Expr::col(Char::SizeW).eq(1).or(Expr::col(Char::SizeH).eq(2))) .and_where(Expr::col(Char::SizeW).eq(3).or(Expr::col(Char::SizeH).eq(4))) .to_owned(); assert_eq!( query.to_string(MysqlQueryBuilder), r#"SELECT `character`, `size_w`, `size_h` FROM `character` WHERE ((`size_w` = 1) OR (`size_h` = 2)) AND ((`size_w` = 3) OR (`size_h` = 4))"# ); assert_eq!( query.to_string(PostgresQueryBuilder), r#"SELECT "character", "size_w", "size_h" FROM "character" WHERE (("size_w" = 1) OR ("size_h" = 2)) AND (("size_w" = 3) OR ("size_h" = 4))"# ); assert_eq!( query.to_string(SqliteQueryBuilder), r#"SELECT `character`, `size_w`, `size_h` FROM `character` WHERE ((`size_w` = 1) OR (`size_h` = 2)) AND ((`size_w` = 3) OR (`size_h` = 4))"# );
pub fn equals<T>(self, right: T) -> Self where
T: Into<SimpleExpr>,
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T: Into<SimpleExpr>,
Compares with another SimpleExpr
for equality.
Examples
use sea_query::{*, tests_cfg::*}; let query = Query::select() .column(Char::Character) .from(Char::Table) .and_where(Expr::col(Char::SizeW).mul(2).equals(Expr::col(Char::SizeH).mul(3))) .to_owned(); assert_eq!( query.to_string(MysqlQueryBuilder), r#"SELECT `character` FROM `character` WHERE `size_w` * 2 = `size_h` * 3"# ); assert_eq!( query.to_string(PostgresQueryBuilder), r#"SELECT "character" FROM "character" WHERE "size_w" * 2 = "size_h" * 3"# ); assert_eq!( query.to_string(SqliteQueryBuilder), r#"SELECT `character` FROM `character` WHERE `size_w` * 2 = `size_h` * 3"# );
pub fn not_equals<T>(self, right: T) -> Self where
T: Into<SimpleExpr>,
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T: Into<SimpleExpr>,
Compares with another SimpleExpr
for inequality.
Examples
use sea_query::{*, tests_cfg::*}; let query = Query::select() .column(Char::Character) .from(Char::Table) .and_where(Expr::col(Char::SizeW).mul(2).not_equals(Expr::col(Char::SizeH))) .to_owned(); assert_eq!( query.to_string(MysqlQueryBuilder), r#"SELECT `character` FROM `character` WHERE `size_w` * 2 <> `size_h`"# ); assert_eq!( query.to_string(PostgresQueryBuilder), r#"SELECT "character" FROM "character" WHERE "size_w" * 2 <> "size_h""# ); assert_eq!( query.to_string(SqliteQueryBuilder), r#"SELECT `character` FROM `character` WHERE `size_w` * 2 <> `size_h`"# );
pub fn add<T>(self, right: T) -> Self where
T: Into<SimpleExpr>,
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T: Into<SimpleExpr>,
Perform addition with another SimpleExpr
.
Examples
use sea_query::{*, tests_cfg::*}; let query = Query::select() .expr(Expr::col(Char::SizeW).max().add(Expr::col(Char::SizeH).max())) .from(Char::Table) .to_owned(); assert_eq!( query.to_string(MysqlQueryBuilder), r#"SELECT MAX(`size_w`) + MAX(`size_h`) FROM `character`"# ); assert_eq!( query.to_string(PostgresQueryBuilder), r#"SELECT MAX("size_w") + MAX("size_h") FROM "character""# ); assert_eq!( query.to_string(SqliteQueryBuilder), r#"SELECT MAX(`size_w`) + MAX(`size_h`) FROM `character`"# );
pub fn sub<T>(self, right: T) -> Self where
T: Into<SimpleExpr>,
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T: Into<SimpleExpr>,
Perform subtraction with another SimpleExpr
.
Examples
use sea_query::{*, tests_cfg::*}; let query = Query::select() .expr(Expr::col(Char::SizeW).max().sub(Expr::col(Char::SizeW).min())) .from(Char::Table) .to_owned(); assert_eq!( query.to_string(MysqlQueryBuilder), r#"SELECT MAX(`size_w`) - MIN(`size_w`) FROM `character`"# ); assert_eq!( query.to_string(PostgresQueryBuilder), r#"SELECT MAX("size_w") - MIN("size_w") FROM "character""# ); assert_eq!( query.to_string(SqliteQueryBuilder), r#"SELECT MAX(`size_w`) - MIN(`size_w`) FROM `character`"# );
Trait Implementations
impl Clone for SimpleExpr
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fn clone(&self) -> SimpleExpr
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pub fn clone_from(&mut self, source: &Self)
1.0.0[src]
impl Debug for SimpleExpr
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impl Into<SelectExpr> for SimpleExpr
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fn into(self) -> SelectExpr
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impl Into<SimpleExpr> for Expr
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fn into(self) -> SimpleExpr
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Auto Trait Implementations
impl !RefUnwindSafe for SimpleExpr
impl !Send for SimpleExpr
impl !Sync for SimpleExpr
impl Unpin for SimpleExpr
impl !UnwindSafe for SimpleExpr
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> Same<T> for T
type Output = T
Should always be Self
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,