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Supabase

Introducció

Section titled “Introducció”

Supabase …

You can use supabase-kt to interact with your Postgres database, listen to database changes, invoke Deno Edge Functions, build login and user management functionality, and manage large files.

Base de dades

Section titled “Base de dades”

How you connect to your database depends on where you’re connecting from:

  • For frontend applications, use the Data API
  • For Postgres clients, use a connection string

The direct connection string connects directly to your Postgres instance.

The connection string looks like this:

postgresql://postgres:[YOUR-PASSWORD]@db.apbkobhfnmcqqzqeeqss.supabase.co:5432/postgres

Get your project’s direct string from the Database Settings page:

  • Go to the Settings section.
  • Click Database.
  • Under Connection string, make sure Display connection pooler is unchecked. Copy the URI.

Entorn de treball

Section titled “Entorn de treball”
> gradle init --package dev.xtec --project-name supabase --java-version 21 --type kotlin-application --dsl kotlin --test-framework kotlintest --no-split-project --no-incubating --overwrite

Configura el fitxer build.gradle.kts:

plugins {
    kotlin("plugin.serialization") version "2.0.0"
    // ...
}


dependencies {
    implementation("io.github.cdimascio:dotenv-kotlin:6.5.0")
    implementation(platform("io.github.jan-tennert.supabase:bom:3.0.3"))
    implementation("io.github.jan-tennert.supabase:postgrest-kt")
    implementation("io.github.jan-tennert.supabase:auth-kt")
    implementation("io.github.jan-tennert.supabase:realtime-kt")
    implementation("io.ktor:ktor-client-cio:3.0.3")
    // ...

Crea un fitxer app/src/main/resources/.env/ per guardar …

URL = ...
API = ...

Modifica el fitxer App.kt:

import io.github.cdimascio.dotenv.dotenv
import io.github.jan.supabase.auth.Auth
import io.github.jan.supabase.createSupabaseClient
import io.github.jan.supabase.postgrest.Postgrest


fun main() {


    val dotenv = dotenv()


    val supabase = createSupabaseClient(
        supabaseUrl = dotenv["URL"],
        supabaseKey = dotenv["KEY"]
    ) {
        install(Auth)
        install(Postgrest)
        //install(Storage)
    }
}

Verifica que funciona

Base de dades

Section titled “Base de dades”

Crea una taula nova amb el SQL Editor:

{% image “sql-editor.png” %}

create table if not exists dog (
  id serial primary key,
  name text not null
)

Tens més informació a Managing tables views and data

Crear les classes Dog i DogInsert:

@Serializable
data class Dog(
    val id: Long,
    val name: String
)


@Serializable
data class DogInsert(
    val name: String
)

Necessites la classe DogInsert perquè l’atribut id és una clau subrogada.

Ja pots inserir el primer gos:

fun main() {
    // ...


    runBlocking {


        val pg = supabase.postgrest


        pg.from("dog").insert(DogInsert("Trufa"))
    }
}

Executa el codi i verifica al “Table Editor” que s’ha inserit el nou registre:

{% image “table-editor-dog.png” %}

Si vols retornar les dades inserides, pots utilitzar el mètode select() dins de la sol·licitud:

fun main() {
    // ...


    runBlocking {


        val pg = supabase.postgrest


        pg.from("dog").insert(DogInsert("Ketsu")) {
            select()
        }.decodeSingle<Dog>().also { println(it) }


        // Dog(id=2, name=Ketsu)
    }
}

També pots inserir diversos gossos a la vegada:

fun main() {
    // ...


    runBlocking {


        val pg = supabase.postgrest


        pg.from("dog").insert(
            listOf(DogInsert("Lassie"), DogInsert("Maverick"))
        ) {
            select()
        }.decodeList<Dog>().onEach { println(it) }


        // Dog(id=3, name=Lassie)
        // Dog(id=4, name=Maverick)
    }
}

Direct connection string

Section titled “Direct connection string”

https://supabase.com/docs/guides/database/connecting-to-postgres#direct-connections

TODO

Section titled “TODO”