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calasql-query_3.0.1.5.source-code.JoinOps.scala Maven / Gradle / Ivy
package scalasql.query
import scalasql.core.{Expr, WithSqlExpr}
trait JoinOps[C[_, _], Q, R] extends WithSqlExpr[Q] {
/**
* Performs a `JOIN`/`INNER JOIN` on the given [[other]], typically a [[Table]] or [[Select]].
*/
def join[Q2, R2, QF, RF](other: Joinable[Q2, R2])(on: (Q, Q2) => Expr[Boolean])(
implicit ja: JoinAppend[Q, Q2, QF, RF]
): C[QF, RF] = join0("JOIN", other, Some(on))
/**
* Performs a `CROSS JOIN`, which is an `INNER JOIN` but without the `ON` clause
*/
def crossJoin[Q2, R2, QF, RF](other: Joinable[Q2, R2])(
implicit ja: JoinAppend[Q, Q2, QF, RF]
): C[QF, RF] = join0("CROSS JOIN", other, None)
protected def join0[Q2, R2, QF, RF](
prefix: String,
other: Joinable[Q2, R2],
on: Option[(Q, Q2) => Expr[Boolean]]
)(
implicit ja: JoinAppend[Q, Q2, QF, RF]
): C[QF, RF]
protected def joinInfo[Q2, R2](
joinPrefix: String,
other: Joinable[Q2, R2],
on: Option[(Q, Q2) => Expr[Boolean]]
) = {
val (otherFrom, otherExpr) = Joinable.toFromExpr(other)
val otherOn = on.map(_(expr, otherExpr))
val otherJoin = Join(joinPrefix, Seq(Join.From(otherFrom, otherOn)))
(Seq(otherJoin), otherExpr)
}
}
object JoinOps {
def join0[C[_, _], Q, R, Q2, R2, QF, RF](
v: JoinOps[C, Q, R],
prefix: String,
other: Joinable[Q2, R2],
on: Option[(Q, Q2) => Expr[Boolean]]
)(
implicit ja: JoinAppend[Q, Q2, QF, RF]
) = {
v.join0[Q2, R2, QF, RF](prefix, other, on)
}
}
