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Within LTS Haskell 24.20 (ghc-9.10.3)
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<=. ) :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (Value typ) -> SqlExpr (Value Bool)esqueleto Database.Esqueleto.Internal.Internal This operator translates to the SQL operator <=. Example:
where_ $ val 21 <=. user ^. UserAge
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esqueleto Database.Esqueleto.Internal.Internal No documentation available.
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==. ) :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (Value typ) -> SqlExpr (Value Bool)esqueleto Database.Esqueleto.Internal.Internal This operator produces the SQL operator =, which is used to compare values for equality. Example:
query :: UserId -> SqlPersistT IO [Entity User] query userId = select $ do user <- from $ table @User where_ (user ^. UserId ==. val userId) pure user
This would generate the following SQL:SELECT user.* FROM user WHERE user.id = ?
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>. ) :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (Value typ) -> SqlExpr (Value Bool)esqueleto Database.Esqueleto.Internal.Internal This operator translates to the SQL operator >. Example:
where_ $ user ^. UserAge >. val 20
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>=. ) :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (Value typ) -> SqlExpr (Value Bool)esqueleto Database.Esqueleto.Internal.Internal This operator translates to the SQL operator >=. Example:
where_ $ user ^. UserAge >=. val 21
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esqueleto Database.Esqueleto.Internal.Internal Project an EntityField of a nullable entity. The result type will be Nullable, meaning that nested Maybe won't be produced here. As of v3.6.0.0, this will attempt to combine nested Maybe. If you want to keep nested Maybe, then see ??..
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esqueleto Database.Esqueleto.Internal.Internal Project a field of an entity that may be null. This variant will produce a nested Maybe if you select a Maybe column. If you want to collapse Maybe, see ?..
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esqueleto Database.Esqueleto.Internal.Internal Project a field of an entity.
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||. ) :: SqlExpr (Value Bool) -> SqlExpr (Value Bool) -> SqlExpr (Value Bool)esqueleto Database.Esqueleto.Internal.Internal This operator translates to the SQL operator AND. Example:
where_ $ user ^. UserName ==. val Matt ||. user ^. UserName ==. val John
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!=. ) :: PersistField typ => SqlExpr (Value typ) -> SqlExpr (Value typ) -> SqlExpr (Value Bool)esqueleto Database.Esqueleto.Legacy This operator translates to the SQL operator !=. Example:
where_ $ user ^. UserName !=. val Bob