CountRepository.kt

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 * software under copyright law.
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package net.dzikoysk.exposed.upsert.spec

import net.dzikoysk.exposed.upsert.upsert
import org.jetbrains.exposed.dao.id.IntIdTable
import org.jetbrains.exposed.sql.Column
import org.jetbrains.exposed.sql.SchemaUtils
import org.jetbrains.exposed.sql.SqlExpressionBuilder
import org.jetbrains.exposed.sql.StdOutSqlLogger
import org.jetbrains.exposed.sql.addLogger
import org.jetbrains.exposed.sql.select
import org.jetbrains.exposed.sql.transactions.transaction

internal class CountRepository {

    internal object CountTable : IntIdTable("count") {
        val count: Column<Int> = integer("count")
        val state: Column<String> = text("state")
    }

    internal fun createSchema() {
        transaction {
            addLogger(StdOutSqlLogger)
            SchemaUtils.create(CountTable)
        }
    }

    internal fun upsertCount(id: Int, count: Int): Pair<Int, String> =
        transaction {
            CountTable.upsert(CountTable.id,
                insertBody = {
                    it[CountTable.id] = id
                    it[CountTable.count] = count
                    it[CountTable.state] = "inserted"
                },
                updateBody = {
                    with(SqlExpressionBuilder) {
                        it.update(CountTable.count, CountTable.count + count)
                    }

                    it[CountTable.state] = "updated"
                }
            )

            CountTable.select { CountTable.id eq id }
                .first()
                .let {
                    Pair(
                        it[CountTable.count],
                        it[CountTable.state]
                    )
                }
        }

}