Created
August 31, 2018 04:31
-
-
Save mustafo/36e9f754aaefc85924eb0ddc276d970e to your computer and use it in GitHub Desktop.
The right way to use one to many relationship in jdbi with kotlin
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import org.jdbi.v3.core.kotlin.KotlinMapper | |
| import org.jdbi.v3.core.mapper.RowMapperFactory | |
| import org.junit.jupiter.api.Test | |
| import tj.alif.core.app.db.RepositoryTest | |
| import org.jdbi.v3.core.result.RowView | |
| data class Contact ( | |
| val id: Int, | |
| val name: String, | |
| var phones: MutableList<Phone> = mutableListOf() | |
| ) { | |
| fun addPhone(phone: Phone) = phones.add(phone) | |
| } | |
| data class Phone (val id: Int, | |
| val type: String, | |
| val number: String | |
| ) | |
| fun factory(type: Class<*>, prefix: String): RowMapperFactory { | |
| return RowMapperFactory.of(type, KotlinMapper(type, prefix)) | |
| } | |
| class ContactPhonesTest: RepositoryTest() { | |
| @Test | |
| fun `some test`() { | |
| val SELECT_ALL = ("select contacts.id c_id, name c_name, " | |
| + "phones.id p_id, type p_type, phones.number p_number " | |
| + "from contacts left join phones on contacts.id = phones.contact_id " | |
| + "order by c_name, p_type") | |
| val contacts = db.createQuery(SELECT_ALL) | |
| .registerRowMapper(factory(Contact::class.java, "c")) | |
| .registerRowMapper(factory(Phone::class.java, "p")) | |
| .reduceRows(linkedMapOf()) { map: LinkedHashMap<Int, Contact>, rowView: RowView -> | |
| val contact = map.computeIfAbsent(rowView.getColumn("c_id", Int::class.javaObjectType)) { | |
| rowView.getRow(Contact::class.java) | |
| } | |
| if (rowView.getColumn("p_id", Int::class.javaObjectType) != null) { | |
| contact.addPhone(rowView.getRow(Phone::class.java)) | |
| } | |
| map | |
| } | |
| .toList().map { it.second } | |
| println(contacts) | |
| } | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
👍 This was very helpful, thank you.