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A Multiplatform Delight (KotlinConf 2018)

A Multiplatform Delight (KotlinConf 2018)

SQL Delight, a type-safe database API, recently completed migration from being a Java-generating, Android-specific tool to a Kotlin-generating, multiplatform one. Migrating an API from Java to Kotlin has obvious benefits, but adding multiplatform support for iOS introduces a dynamic which complicates the API, code generation, and runtime.

This talk will cover the challenges of platform-agnostic API design, type-safe multiplatform Kotlin code generation, and the integration of platform-specific runtimes such that the library not only runs efficiently on each platform but also integrates well with the other languages each might be using.

Presented with Alec Strong.

Video: https://youtu.be/WkIry790PHI

Jake Wharton
PRO

October 04, 2018
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Transcript

  1. Alec Strong
    Jake Wharton

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  2. data class Player(A
    val name: String,
    val ranking: Int,
    val country: String
    )A

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  3. @Entity
    data class Player(A
    val name: String,
    val ranking: Int,
    val country: String
    )A

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  4. @Entity
    data class Player(A
    val name: String,
    val ranking: Int,
    val country: String
    )A
    @Entity
    data class Match(A
    val player1: Player,
    val player2: Player,
    val winner: Player
    )A

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  5. Source Code
    Annotation

    Processor
    Reflection
    @Entity
    data class Player(A
    val name: String,
    val ranking: Int,
    val country: String
    )A
    @Entity
    data class Match(A
    val player1: Player,
    val player2: Player,
    val winner: Player
    )A

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  6. Source Code
    Annotation

    Processor
    Reflection
    SQLite
    @Entity
    data class Player(A
    val name: String,
    val ranking: Int,
    val country: String
    )A
    @Entity
    data class Match(A
    val player1: Player,
    val player2: Player,
    val winner: Player
    )A

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  7. CREATE TABLE player (A
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );
    CREATE TABLE match (A
    player1 INTEGER NOT NULL REFERENCES player,
    player2 INTEGER NOT NULL REFERENCES player,
    winner INTEGER NOT NULL REFERENCES player
    );

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  8. CREATE TABLE player (A
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );
    CREATE TABLE match (A
    player1 INTEGER NOT NULL REFERENCES player,
    player2 INTEGER NOT NULL REFERENCES player,
    winner INTEGER NOT NULL REFERENCES player
    );B

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  9. CREATE TABLE player (A
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );
    CREATE TABLE match (A
    player1 INTEGER NOT NULL REFERENCES player,
    player2 INTEGER NOT NULL REFERENCES player,
    winner INTEGER NOT NULL REFERENCES player,
    PRIMARY KEY (player1, player2)
    ) WITHOUT ROWID;B

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  10. SQLite
    Source Code
    Annotation

    Processor
    Reflection
    @Entity
    data class Player(
    val name: String,
    val ranking: Int,
    val country: String
    )
    @Entity
    data class Match(
    val player1: Player,
    val player2: Player,
    val winner: Player
    )
    CREATE TABLE player (A
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );
    CREATE TABLE match (A
    player1 INTEGER NOT NULL REFERENCES player,
    player2 INTEGER NOT NULL REFERENCES player,
    winner INTEGER NOT NULL REFERENCES player,
    PRIMARY KEY (player1, player2)
    ) WITHOUT ROWID;

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  11. @Entity
    data class Player(A
    val name: String,
    val ranking: Int,
    val country: String
    )A
    @Entity
    data class Match(A
    val player1: Player,
    val player2: Player,
    val winner: Player
    )A

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  12. @Entity
    data class Player(A
    @PrimaryKey @Autoincrement val id: Int,
    val name: String,
    val ranking: Int,
    val country: String
    )A
    @Entity
    data class Match(A
    val player1: Player,
    val player2: Player,
    val winner: Player
    )A

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  13. @Entity
    data class Player(A
    @PrimaryKey @Autoincrement val id: Int,
    val name: String,
    val ranking: Int,
    val country: String
    )A
    @Entity(primaryKeys = ['player1', ‘player2'])
    data class Match(A
    val player1: Player,
    val player2: Player,
    val winner: Player
    )A

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  14. @Entity
    data class Player(A
    @PrimaryKey @Autoincrement val id: Int,
    val name: String,
    val ranking: Int,
    val country: String
    )A
    @Entity(primaryKeys = ['player1', ‘player2'])
    data class Match(A
    val player1: Player,
    val player2: Player,
    val winner: Player
    )A
    A
    @PrimaryKey @Autoincrement val id: Int,
    @Entity(primaryKeys = ['player1', ‘player2'])

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  15. ALTER TABLE player
    ADD COLUMN id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT;
    CREATE TABLE new_match (
    player1 INTEGER NOT NULL REFERENCES player,
    player2 INTEGER NOT NULL REFERENCES player,
    winner INTEGER NOT NULL REFERENCES player,
    PRIMARY KEY (player1, player2)
    ) WITHOUT ROWID;
    -- migrate match to new_match

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  16. QueryBuilders

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  17. View Slide

  18. QueryBuilders
    jakes.link/resurgence-of-sql

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  19. SQL Delight

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  20. SQLite
    Source Code
    Annotation

    Processor
    Reflection

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  21. SQLite Compiler
    Generated
    Code

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  22. CREATE TABLE player (A
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );

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  23. CREATE TABLE player (A
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );
    withRanking:
    SELECT *
    FROM player
    WHERE ranking = ?;

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  24. SQLite Compiler
    Generated
    Code
    CREATE TABLE player (A
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );
    withRanking:
    SELECT *
    FROM player
    WHERE ranking = ?;

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  25. interface PlayerModel {A
    long id();
    @NonNull String name();
    @NonNull String country();
    long ranking();
    final class Factory {A
    public Factory(Creator creator);
    public SqlDelightQuery withRanking(long ranking);
    public RowMapper withRankingMapper();
    }A
    }A

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  26. interface PlayerModel {A

    final class Factory {A
    public Factory(Creator creator);

    }B
    }A
    @AutoValue
    public abstract class MyPlayerModel implements PlayerModel {A
    public static Factory FACTORY =
    new Factory(AutoValue_MyPlayerModel::new)
    }A

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  27. SqlDelightStatement query = MyPlayerModel.FACTORY.withRanking(10);
    Observable> rank10 =
    db.createQuery(query.tables, query.statement, query.args)
    .mapToList(MyPlayerModel.FACTORY::withRankingMapper);
    interface PlayerModel {A

    final class Factory {A
    public Factory(Creator creator);
    public SqlDelightQuery withRanking(long ranking);
    public RowMapper withRankingMapper();
    }B
    }A

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  28. SQL Delight 0.7

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  29. View Slide

  30. QueryBuilders
    jakes.link/embracing-sql

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  31. SQL Delight 1.0

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  32. SQLite Compiler
    Generated
    Code
    CREATE TABLE player (
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );
    withRanking:
    SELECT *
    FROM player
    WHERE ranking = ?;
    insertPlayer:
    INSERT INTO player (name, country, ranking)
    VALUES (?, ?, ?);

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  33. CREATE TABLE player (
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );
    withRanking:
    SELECT *
    FROM player
    WHERE ranking = ?;
    insertPlayer:
    INSERT INTO player (name, country, ranking)
    VALUES (?, ?, ?);

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  34. SQLite Compiler
    Generated
    Code
    CREATE TABLE player (
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );
    withRanking:
    SELECT *
    FROM player
    WHERE ranking = ?;
    insertPlayer:
    INSERT INTO player (name, country, ranking)
    VALUES (?, ?, ?);

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  35. interface Player {A
    val id: Long
    val name: String
    val country: String
    val ranking: Long
    data class Impl(A
    override val id: Long,
    override val name: String,
    override val country: String,
    override val ranking: Long
    ) : Player
    }A

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  36. class PlayerQueries : Transacter {A
    fun withRanking(
    ranking: Long,
    mapper: (
    id: Long,
    name: String,
    country: String,
    ranking: Long
    ) -> T
    ): Query
    fun withRanking(ranking: Long): Query
    fun insertPlayer(
    name: String,
    country: String,
    ranking: Long
    ): Long
    }A

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  37. headToHead:
    SELECT player1.name AS player1Name,
    player2.name AS player2Name,
    count(nullif(match.winner = player1.id, 0)) AS player1Wins,
    count(nullif(match.winner = player2.id, 0)) AS player2Wins
    FROM match
    JOIN player AS player1
    ON (player1.name = :firstPlayerName AND
    (player1.id = match.player1 OR player1.id = match.player2)
    )
    JOIN player AS player2
    ON (player2.name = :secondPlayerName AND
    (player2.id = match.player1 OR player2.id = match.player2)
    )
    ;

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  38. class PlayerQueries : Transacter {A
    fun headToHead(
    firstPlayerName: String,
    secondPlayerName: String,
    mapper: (
    player1Name: String,
    player2Name: String,
    player1Wins: Long,
    player2Wins: Long
    ) -> T
    ): Query
    fun headToHead(
    firstPlayerName: String,
    secondPlayerName: String
    ): Query
    }A

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  39. class PlayerQueries : Transacter {A
    fun withRanking(
    ranking: Long,
    mapper: (
    id: Long,
    name: String,
    country: String,
    ranking: Long
    ) -> T
    ): Query
    fun withRanking(ranking: Long): Query
    fun insertPlayer(
    name: String,
    country: String,
    ranking: Long
    ): Long
    }A

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  40. class PlayerQueries : Transacter {A
    fun withRanking(ranking: Long): Query
    }A
    val player: Query = playerQueries.withRanking(10)

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  41. Query< >
    class PlayerQueries : Transacter {A
    fun withRanking(ranking: Long): Query
    }A
    val player: Player = playerQueries.withRanking(10).executeAsOne()

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  42. class PlayerQueries : Transacter {A
    fun withRanking(ranking: Long): Query
    }A
    val player: Observable> = playerQueries.withRanking(10)
    .asObservable()
    .ex

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  43. class PlayerQueries : Transacter {A
    fun withRanking(ranking: Long): Query
    }A
    val player: Observable> = playerQueries.withRanking(10)
    .asObservable()
    .mapToList()

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  44. class PlayerQueries : Transacter {A
    fun withRanking(ranking: Long, mapper: (
    id: Long,
    name: String,
    country: String,
    ranking: Long
    ) -> T): Query
    }A
    val player = playerQueries.withRanking(10, ::MyPlayer)
    P
    l
    a
    y
    e
    r

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  45. class PlayerQueries : Transacter {A
    }A
    val id = playerQueries.insertPlayer(
    name = "Roger Federer",
    country = "Switzerland",
    ranking = 2
    )
    fun insertPlayer(
    name: String,
    country: String,
    ranking: Long
    ): Long

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  46. Generated
    Code
    SQLite Compiler
    CREATE TABLE player (A
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );
    withRanking:
    SELECT *
    FROM player
    WHERE ranking = ?;
    class PlayerQueries : Transacter {A
    fun insertPlayer(
    name: String,
    country: String,
    ranking: Long
    ): Long
    }A

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  47. CREATE TABLE player (
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country NOT NULL,
    ranking INTEGER NOT NULL
    );
    TEXT

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  48. CREATE TABLE player (
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country NOT NULL,
    ranking INTEGER NOT NULL
    );
    import com.tennis.db.CountryCode;
    TEXT AS CountryCode

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  49. import com.tennis.db.CountryCode;
    CREATE TABLE player (
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT AS CountryCode NOT NULL,
    ranking INTEGER NOT NULL
    );

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  50. SQLite Compiler
    Generated
    Code
    import com.tennis.db.CountryCode;
    CREATE TABLE player (
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT AS CountryCode NOT NULL,
    ranking INTEGER NOT NULL
    );

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  51. class QueryWrapper(
    database: SqlDatabase,
    internal val playerAdapter: Player.Adapter
    ) {A
    val playerQueries: PlayerQueries
    }A

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  52. class QueryWrapper(
    database: SqlDatabase,
    internal val playerAdapter: Player.Adapter
    ) {A
    val playerQueries: PlayerQueries
    }A
    interface Player {A
    class Adapter(
    val countryAdapter: ColumnAdapter
    )
    }A

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  53. class QueryWrapper(
    database: SqlDatabase,
    internal val playerAdapter: Player.Adapter
    ) {A
    val playerQueries: PlayerQueries
    }A
    val queryWrapper = QueryWrapper(
    database = database,
    playerAdapter = Player.Adapter(
    countryAdapter = EnumColumnAdapter()
    ),
    )

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  54. class QueryWrapper(
    database: SqlDatabase,
    internal val playerAdapter: Player.Adapter
    ) {A
    val playerQueries: PlayerQueries
    }A
    val queryWrapper = QueryWrapper(
    database = database,
    playerAdapter = Player.Adapter(
    countryAdapter = EnumColumnAdapter()
    ),
    )
    val playerQueries: PlayerQueries = queryWrapper.playerQueries
    val playerQueries: PlayerQueries = queryWrapper.playerQueries
    val playerQueries: PlayerQueries

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  55. class QueryWrapper {A
    object Schema : SqlDatabase.Schema {A
    override val version: Int
    get() = 2
    override fun create(db: SqlDatabaseConnection)
    override fun migrate(
    db: SqlDatabaseConnection,
    oldVersion: Int,
    newVersion: Int
    )
    }A
    }A

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  56. SQLite
    Generated
    Code
    Compiler
    CREATE TABLE player (A
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );
    withRanking:
    SELECT *
    FROM player
    WHERE ranking = ?;
    class QueryWrapper {A
    object Schema : SqlDatabase.Schema {A
    override val version: Int
    get() = 2
    override fun create(db: SqlDatabaseConnection)
    override fun migrate(
    db: SqlDatabaseConnection,
    oldVersion: Int,
    newVersion: Int
    )
    }A
    }A

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  57. SQLite
    Generated
    Code
    Compiler
    SQLite
    Migrations

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  58. ALTER TABLE player
    ADD COLUMN id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT;
    CREATE TABLE new_match (
    player1 INTEGER NOT NULL REFERENCES player,
    player2 INTEGER NOT NULL REFERENCES player,
    winner INTEGER NOT NULL REFERENCES player,
    PRIMARY KEY (player1, player2)
    ) WITHOUT ROWID;
    -- migrate match to new_match

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  59. SQLite
    Migrations
    SQLite
    Generated
    Code
    Compiler
    ALTER TABLE player
    ADD COLUMN id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT;
    CREATE TABLE new_match (
    player1 INTEGER NOT NULL REFERENCES player,
    player2 INTEGER NOT NULL REFERENCES player,
    winner INTEGER NOT NULL REFERENCES player,
    PRIMARY KEY (player1, player2)
    ) WITHOUT ROWID;
    -- migrate match to new_match

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  60. SQL Delight 1.0

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  61. SQL Delight Multiplatform?

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  62. SQL Delight Multiplatform?

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  63. CashApp

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  64. db
    backend
    presenters
    api
    CashApp
    proto
    viewmodels

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  65. db

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  66. SQLite
    Generated
    Code
    SQL Delight
    CREATE TABLE player (A
    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    country TEXT NOT NULL,
    ranking INTEGER NOT NULL
    );
    withRanking:
    SELECT *
    FROM player
    WHERE ranking = ?;
    db

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  67. Generated
    Code
    SQL Delight
    db
    SQLite

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  68. Generated
    Code
    SQL Delight
    db
    SQLite
    Generated
    Swift Code
    Compiler

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  69. Generated
    Java
    wire
    protos
    .proto
    Generated C
    protoc

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  70. Generated
    Code
    db
    SQL Delight
    SQLite
    Generated
    Swift Code
    Compiler

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  71. Generated
    Code
    db
    SQL Delight
    SQLite

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  72. Generated
    Code
    Kotlin/Native
    kotlinc Android
    Native

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  73. Generated
    Code
    Kotlin/Native
    kotlinc Android
    Native
    kotlinc JVM
    kotlin2js JavaScript

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  74. Android
    JVM JavaScript
    Native

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  75. Android
    JVM JavaScript
    Native
    android.database.*
    android.database.sqlite.*

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  76. Android
    JVM JavaScript
    Native
    android.database.*
    android.database.sqlite.*
    sqlite3.h

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  77. Android
    JVM JavaScript
    Native
    android.database.*
    android.database.sqlite.*
    sqlite3.h
    java.sql.*
    org.sqlite.*

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  78. Android
    JVM JavaScript
    Native
    android.database.*
    android.database.sqlite.*
    sqlite3.h
    java.sql.*
    org.sqlite.* (xerial)

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  79. Android
    JVM JavaScript
    Native
    android.database.*
    android.database.sqlite.*
    sqlite3.h
    java.sql.*
    org.sqlite.*
    Node? WASM? Vanilla JS?
    (xerial)

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  80. android.database.*
    android.database.sqlite.*
    sqlite3.h
    Node? WASM? Vanilla JS?
    Generated
    Code
    Android
    JVM
    Native
    JavaScript
    java.sql.*
    org.sqlite.* (xerial)

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  81. android.database.*
    android.database.sqlite.*
    sqlite3.h
    Node? WASM? Vanilla JS?
    Generated
    Code
    Android
    Native
    JavaScript
    Database
    Abstraction
    java.sql.*
    org.sqlite.* (xerial)
    JVM

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  82. Database Abstraction
    SqlDatabase

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  83. Database Abstraction
    SqlDatabase
    SqlDatabase.Schema

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  84. Database Abstraction
    SqlDatabase
    SqlDatabase.Schema
    SqlPreparedStatement

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  85. Database Abstraction
    SqlDatabase
    SqlDatabase.Schema
    SqlPreparedStatement
    Transacter.Transaction

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  86. Database Abstraction
    SqlDatabase
    SqlDatabase.Schema
    SqlPreparedStatement
    Transacter.Transaction
    Transacter

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  87. Database Abstraction
    SqlDatabase
    SqlDatabase.Schema
    SqlPreparedStatement
    Transacter.Transaction
    Transacter

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  88. Database Abstraction
    SqlDatabase
    SqlDatabase.Schema
    SqlPreparedStatement
    Transacter.Transaction
    Transacter
    SqlCursor

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  89. Database Abstraction
    SqlDatabase
    SqlDatabase.Schema
    SqlPreparedStatement
    Transacter.Transaction
    Transacter
    SqlCursor
    Query

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  90. android.database.*
    android.database.sqlite.*
    sqlite3.h
    Node? WASM? Vanilla JS?
    Generated
    Code
    Android
    JVM
    Native
    JavaScript
    Database
    Abstraction
    java.sql.*
    org.sqlite.* (xerial)
    S
    Sql
    Sql
    Tran
    T
    S
    Q

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  91. android.database.*
    android.database.sqlite.*
    sqlite3.h
    Node? WASM? Vanilla JS?
    Generated
    Code
    Android
    Native
    JavaScript
    Database
    Abstraction
    java.sql.*
    org.sqlite.* (xerial)
    Android
    Driver
    knarch.db
    Driver
    JDBC
    Driver
    JS
    Driver
    JVM

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  92. android.database.*
    android.database.sqlite.*
    sqlite3.h
    Android
    Native
    Database
    Abstraction
    java.sql.*
    org.sqlite.* (xerial)
    Android
    Driver
    knarch.db
    Driver
    JDBC
    Driver
    JS
    JVM

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  93. android.database.*
    android.database.sqlite.*
    sqlite3.h
    Android
    Native
    java.sql.*
    org.sqlite.* (xerial)
    Android
    Driver
    knarch.db
    Driver
    JDBC
    Driver
    JS
    JVM
    AndroidX Sqlite
    Abstraction
    AndroidX Sqlite
    Framework Impl

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  94. android.database.*
    android.database.sqlite.*
    sqlite3.h
    Android
    Native
    java.sql.*
    org.sqlite.* (xerial)
    Android
    Driver
    knarch.db
    Driver
    JDBC
    Driver
    JS
    JVM
    AndroidX Sqlite
    Abstraction
    AndroidX Sqlite
    Framework Impl
    Android
    android.database.*
    net.sqlcipher.database.*
    AndroidX
    SQLCipher Impl

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  95. android.
    android.
    sqlite3.h
    Node? WASM? Vanilla JS?
    ed
    Native
    JavaScript
    Database
    Abstraction
    java.sql.*
    org.sqlite.* (xerial)
    Android
    Driver
    knarch.db
    Driver
    JDBC
    Driver
    JS
    Driver
    JVM
    AndroidX Sqlite
    Abstraction
    AndroidX Sqlite
    Framework Impl
    android.
    net.sqlc
    AndroidX
    SQLCipher Impl

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  96. android.
    android.
    sqlite3.h
    Node? WASM? Vanilla JS?
    ed
    Native
    JavaScript
    Database
    Abstraction
    java.sql.*
    org.sqlite.* (xerial)
    Android
    Driver
    knarch.db
    Driver
    JDBC
    Driver
    JS
    Driver
    JVM
    AndroidX Sqlite
    Abstraction
    AndroidX Sqlite
    Framework Impl
    android.
    net.sqlc
    AndroidX
    SQLCipher Impl
    AAA
    BBB

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  97. sqlite3.h
    Node? WASM? Vanilla JS?
    ed
    Native
    JavaScript
    Database
    Abstraction
    java.sql.*
    org.sqlite.* (xerial)
    Driver
    knarch.db
    Driver
    JDBC
    Driver
    JS
    Driver
    JVM
    Abstraction
    android.
    net.sqlc
    AndroidX
    SQLCipher Impl
    AAA
    BBB

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  98. sqlite3.h
    ed
    Native
    Node? WASM? Vanilla JS?
    JavaScript
    Database
    Abstraction
    java.sql.*
    org.sqlite.* (xerial)
    Driver
    knarch.db
    Driver
    JDBC
    Driver
    JVM
    Abstraction
    android.
    net.sqlc
    AndroidX
    SQLCipher Impl

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  99. android.database.*
    android.database.sqlite.*
    sqlite3.h
    Generated
    Code
    Android
    Native
    Node? WASM? Vanilla JS?
    JavaScript
    Database
    Abstraction
    java.sql.*
    org.sqlite.* (xerial)
    Android
    Driver
    knarch.db
    Driver
    JDBC
    Driver
    JVM
    AndroidX Sqlite
    Abstraction
    AndroidX Sqlite
    Framework Impl
    Android
    android.database.*
    net.sqlcipher.database.*
    AndroidX
    SQLCipher Impl

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  100. android.database.*
    android.database.sqlite.*
    sqlite3.h
    Generated
    Code
    Android
    Native
    Node? WASM? Vanilla JS?
    JavaScript
    Database
    Abstraction
    java.sql.*
    org.sqlite.* (xerial)
    Android
    Driver
    knarch.db
    Driver
    JDBC
    Driver
    JVM
    AndroidX Sqlite
    Abstraction
    AndroidX Sqlite
    Framework Impl
    Android
    android.database.*
    net.sqlcipher.database.*
    AndroidX
    SQLCipher Impl

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  101. Database Abstraction
    SqlDatabase
    SqlDatabase.Schema
    SqlPreparedStatement
    Transacter.Transaction
    Transacter
    SqlCursor
    Query

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  102. Database Abstraction
    SqlDatabase.Schema
    SqlPreparedStatement
    Transacter.Transaction
    Transacter
    Query
    SqlDatabase
    SqlCursor

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  103. package com.squareup.sqldelight.db
    expect interface Closeable {
    fun close()
    }
    expect inline fun T.use(body: (T) -> R): R

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  104. package com.squareup.sqldelight.db
    expect interface Closeable {
    fun close()
    }
    expect inline fun T.use(body: (T) -> R): R
    package com.squareup.sqldelight.db
    import kotlin.io.use as kotlinIoUse
    actual typealias Closeable = java.io.Closeable
    actual inline fun T.use(body: (T) -> R): R =
    kotlinIoUse(body)

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  105. package com.squareup.sqldelight.db
    expect interface Closeable {
    fun close()
    }
    expect inline fun T.use(body: (T) -> R): R
    package com.squareup.sqldelight.db
    actual interface Closeable {
    actual fun close()
    }
    actual inline fun T.use(body: (T) -> R): R {
    // Copy/paste JVM implementation…
    }

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  106. apply plugin: 'org.jetbrains.kotlin.platform.common'
    dependencies {
    compile 'com.squareup.sqldelight:runtime-common:1.0.0'
    }
    apply plugin: 'org.jetbrains.kotlin.platform.jvm' // Or .android
    dependencies {
    compile 'com.squareup.sqldelight:runtime-jdk:1.0.0'
    }
    apply plugin: 'org.jetbrains.kotlin.platform.js'
    dependencies {
    compile 'com.squareup.sqldelight:runtime-js:1.0.0'
    }

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  107. apply plugin: 'org.jetbrains.kotlin.platform.common'
    dependencies {
    compile 'com.squareup.sqldelight:runtime-common:1.0.0'
    }
    apply plugin: 'org.jetbrains.kotlin.platform.jvm' // Or .android
    dependencies {
    compile 'com.squareup.sqldelight:runtime-jdk:1.0.0'
    }
    apply plugin: 'org.jetbrains.kotlin.platform.js'
    dependencies {
    compile 'com.squareup.sqldelight:runtime-js:1.0.0'
    }
    apply plugin: 'org.jetbrains.kotlin.platform.native' // ???

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  108. apply plugin: 'org.jetbrains.kotlin.platform.common'
    dependencies {
    compile 'com.squareup.sqldelight:runtime-common:1.0.0'
    }
    apply plugin: 'org.jetbrains.kotlin.platform.jvm' // Or .android
    dependencies {
    compile 'com.squareup.sqldelight:runtime-jdk:1.0.0'
    }
    apply plugin: 'org.jetbrains.kotlin.platform.js'
    dependencies {
    compile 'com.squareup.sqldelight:runtime-js:1.0.0'
    }
    apply plugin: 'org.jetbrains.kotlin.platform.native' // nope!

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  109. apply plugin: 'org.jetbrains.kotlin.multiplatform'
    dependencies {
    compile 'com.squareup.sqldelight:runtime:1.0.0'
    }

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  110. apply plugin: 'org.jetbrains.kotlin.multiplatform'
    dependencies {
    compile 'com.squareup.sqldelight:runtime:1.0.0'
    }
    // settings.gradle
    enableFeaturePreview('GRADLE_METADATA')

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  111. com.squareup.sqldelight
    + runtime

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  112. com.squareup.sqldelight
    - runtime
    runtime-1.0.0-sources.jar
    runtime-1.0.0-javadoc.jar
    runtime-1.0.0.pom
    runtime-1.0.0.module

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  113. runtime-1.0.0.module
    {
    "variants": [
    {
    "name": "iosArm64-api",
    "available-at": {
    "url": "../../runtime-iosarm64/runtime-iosarm64-1.0.0.module"
    }
    },
    ...
    ]

    }

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  114. com.squareup.sqldelight
    - runtime
    runtime-1.0.0-sources.jar
    runtime-1.0.0-javadoc.jar
    runtime-1.0.0.pom
    runtime-1.0.0.module

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  115. com.squareup.sqldelight
    + runtime

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  116. com.squareup.sqldelight
    + runtime
    + runtime-common
    + runtime-iosarm64
    + runtime-iosx64
    + runtime-jvm
    + runtime-js

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  117. com.squareup.sqldelight
    + android-driver
    + runtime
    + runtime-common
    + runtime-iosarm64
    + runtime-iosx64
    + runtime-jvm
    + runtime-js

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  118. com.squareup.sqldelight
    - android-driver
    android-driver-1.0.0.aar
    android-driver-1.0.0-javador.jar
    android-driver-1.0.0-sources.jar
    android-driver-1.0.0-pom.xml
    + runtime
    + runtime-common
    + runtime-iosarm64
    + runtime-iosx64
    + runtime-jvm
    + runtime-js

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  119. com.squareup.sqldelight
    - android-driver
    android-driver-1.0.0.aar
    android-driver-1.0.0-javador.jar
    android-driver-1.0.0-sources.jar
    android-driver-1.0.0-pom.xml
    + runtime
    + runtime-common
    + runtime-iosarm64
    + runtime-iosx64
    + runtime-jvm
    + runtime-js
    android-driver-1.0.0-pom.xml
    + runtime-jvm

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  120. com.squareup.sqldelight
    - android-driver
    android-driver-1.0.0.aar
    android-driver-1.0.0-javador.jar
    android-driver-1.0.0-sources.jar
    android-driver-1.0.0-pom.xml
    + runtime
    + runtime-common
    + runtime-iosarm64
    + runtime-iosx64
    + runtime-jvm
    + runtime-js
    android-driver-1.0.0-pom.xml
    + runtime

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  121. com.squareup.sqldelight
    - android-driver
    android-driver-1.0.0.aar
    android-driver-1.0.0-javador.jar
    android-driver-1.0.0-sources.jar
    android-driver-1.0.0-pom.xml
    + runtime
    + runtime-common
    + runtime-iosarm64
    + runtime-iosx64
    + runtime-jvm
    + runtime-js
    android-driver-1.0.0-pom.xml
    + runtime-jdk

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  122. apply plugin: ‘com.android.application’
    apply plugin: 'org.jetbrains.kotlin.multiplatform'
    dependencies {A
    implementation 'com.squareup.sqldelight:android-driver:1.0.0'
    }A
    kotlin {A
    sourceSets {A
    commonMain {A
    dependencies {A
    implementation project(':sqldelight-sample:sample-common')
    }A
    }A
    }A
    }A

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  123. apply plugin: ‘com.android.application’
    apply plugin: 'org.jetbrains.kotlin.multiplatform'
    dependencies {A
    implementation 'com.squareup.sqldelight:android-driver:1.0.0'
    }A
    kotlin {A
    sourceSets {A
    commonMain {A
    dependencies {A
    implementation project(':sqldelight-sample:sample-common')
    }A
    }A
    }A
    }A
    A
    implementation 'com.squareup.sqldelight:android-driver:1.0.0'
    A
    A
    implementation project(':sqldelight-sample:sample-common')

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  124. apply plugin: ‘com.android.application’
    apply plugin: 'org.jetbrains.kotlin.multiplatform'
    dependencies {A
    implementation (“com.squareup.sqldelight:android-driver:1.0.0) {A
    exclude group: 'com.squareup.sqldelight', module: 'runtime-jdk'
    }A
    }A
    kotlin {A
    sourceSets {A
    commonMain {A
    dependencies {A
    implementation project(':sqldelight-sample:sample-common')
    }A
    }A
    }A
    }A
    implementation ('com.squareup.sqldelight:android-driver:1.0.0') {A
    exclude group: 'com.squareup.sqldelight', module: 'runtime-jdk'
    }A
    implementation project(':sqldelight-sample:sample-common')

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  125. SqlDatabase.Schema
    SqlPreparedStatement
    Transacter.Transaction
    Transacter
    Query
    SqlDatabase
    SqlCursor

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  126. SqlDatabase.Schema
    SqlPreparedStatement
    Transacter.Transaction
    Transacter
    SqlDatabase
    SqlCursor
    Query

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  127. SqlDatabase.Schema
    SqlPreparedStatement
    Transacter.Transaction
    Transacter
    SqlDatabase
    SqlCursor
    abstract class Query {
    }X

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  128. abstract class Query {
    fun execute(): SqlCursor
    fun executeAsList(): List
    fun executeAsOne(): RowType
    fun executeAsOneOrNull(): RowType?
    }X

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  129. abstract class Query {
    fun execute(): SqlCursor
    fun executeAsList(): List
    fun executeAsOne(): RowType
    fun executeAsOneOrNull(): RowType?
    fun addListener(listener: Listener)
    fun removeListener(listener: Listener)
    interface Listener {
    fun queryResultsChanged()
    }Y
    }X

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  130. abstract class Query {
    fun execute(): SqlCursor
    fun executeAsList(): List
    fun executeAsOne(): RowType
    fun executeAsOneOrNull(): RowType?
    fun addListener(listener: Listener)
    fun removeListener(listener: Listener)
    interface Listener {
    fun queryResultsChanged()
    }Y
    fun notifyDataChanged()
    }X

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  131. val usersQuery: Query = // …
    val users = usersQuery.executeAsList()
    // Show users somewhere…

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  132. val usersQuery: Query = // …
    usersQuery.addListener(object : Listener {
    override fun queryResultsChanged() {
    val users = usersQuery.executeAsList()
    // Show users somewhere…
    }G
    })
    usersQuery.notifyDataChanged()

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  133. val usersQuery: Query = // …
    val executor = // …
    usersQuery.addListener(object : Listener {
    override fun queryResultsChanged() {
    executor.execute {
    val users = usersQuery.executeAsList()
    // Show users somewhere…
    }G
    }G
    })
    usersQuery.notifyDataChanged()

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  134. val usersQuery: Query = // …
    val executor = // …
    val mainThread = Handler(Looper.getMainLooper())
    usersQuery.addListener(object : Listener {
    override fun queryResultsChanged() {
    executor.execute {
    val users = usersQuery.executeAsList()
    mainThread.post {
    // Show users somewhere…
    }
    }G
    }G
    })
    usersQuery.notifyDataChanged()

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  135. val usersQuery: Query = // …

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  136. val usersQuery: Query = // …
    val usersObservable = usersQuery.asObservable()

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  137. val usersQuery: Query = // …
    val usersObservable: Observable = usersQuery.asObservable()

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  138. val usersQuery: Query = // …
    val usersObservable: Observable> = usersQuery.asObservable()

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  139. val usersQuery: Query = // …
    val usersObservable: Observable> = usersQuery.asObservable()
    .map { it.executeAsList() }
    Query

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  140. val usersQuery: Query = // …
    val usersObservable: Observable> = usersQuery.asObservable()
    .mapToList()

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  141. val usersQuery: Query = // …

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  142. val usersQuery: Query = // …
    val usersChannel: ReceiveChannel> = usersQuery.asChannel()

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  143. val usersQuery: Query = // …
    val usersChannel: ReceiveChannel> = usersQuery.asChannel()
    .map { it.executeAsList() }
    Query

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  144. val usersQuery: Query = // …
    val usersChannel: ReceiveChannel> = usersQuery.asChannel()
    .mapToList()

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  145. suspend fun users() {
    val usersQuery: Query = // …
    val usersChannel: ReceiveChannel> = usersQuery.asChannel()
    .mapToList()
    return usersChannel.receive()
    }

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  146. suspend fun users() {
    val usersQuery: Query = // …
    val usersChannel: ReceiveChannel> = usersQuery.asChannel()
    .mapToList()
    return usersChannel.receive()
    }

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  147. suspend fun users() {
    val usersQuery: Query = // …
    val usersChannel: ReceiveChannel> = usersQuery.asChannel()
    .mapToList()
    return usersChannel.receive()
    }

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  148. val usersQuery: Query = // …

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  149. val usersQuery: Query = // …
    val usersLiveData: LiveData> = usersQuery.asLiveData()B

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  150. val usersQuery: Query = // …
    val usersLiveData: LiveData> = usersQuery.asLiveDataList()B
    Query

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  151. val usersQuery: Query = // …
    val executor = // …
    val usersLiveData: LiveData> =
    usersQuery.asLiveDataList(executor)B

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  152. val pagedQuery = QueryDataSourceFactory(
    queryProvider = { limit, offset -> queries.users(limit, offset) },
    count = queries.usersCount())

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  153. apply plugin: 'com.squareup.sqldelight'

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  154. apply plugin: 'com.squareup.sqldelight'
    apply plugin: 'org.jetbrains.kotlin.jvm'

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  155. apply plugin: 'com.squareup.sqldelight'
    apply plugin: 'org.jetbrains.kotlin.jvm'
    // automatically adds…
    dependencies {
    api 'com.squareup.sqldelight:runtime-jdk:1.0.0'
    }X

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  156. apply plugin: 'com.squareup.sqldelight'
    apply plugin: 'org.jetbrains.kotlin.jvm'
    // automatically adds…
    dependencies {
    api 'com.squareup.sqldelight:runtime-jdk:1.0.0'
    }X
    tasks.create('generateSqlDelight', SqlDelightTask) {
    // …
    }X
    tasks.getByName('compileKotlin').dependsOn('generateSqlDelight')

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  157. apply plugin: 'com.squareup.sqldelight'
    apply plugin: 'org.jetbrains.kotlin.js'

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  158. apply plugin: 'com.squareup.sqldelight'
    apply plugin: 'org.jetbrains.kotlin.js'
    // automatically adds…
    dependencies {
    api 'com.squareup.sqldelight:runtime-js:1.0.0'
    }X
    tasks.create('generateSqlDelight', SqlDelightTask) {
    // …
    }X
    tasks.getByName('compileKotlin').dependsOn('generateSqlDelight')

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  159. apply plugin: 'com.squareup.sqldelight'
    apply plugin: 'org.jetbrains.kotlin.multiplatform'

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  160. apply plugin: 'com.squareup.sqldelight'
    apply plugin: 'org.jetbrains.kotlin.multiplatform'
    // automatically adds…
    dependencies {
    api 'com.squareup.sqldelight:runtime:1.0.0'
    }X
    tasks.create('generateSqlDelight', SqlDelightTask) {
    // …
    }X
    tasks.getByName('compileKotlin').dependsOn('generateSqlDelight')

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  161. apply plugin: 'com.squareup.sqldelight'
    apply plugin: 'org.jetbrains.kotlin.android'

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  162. apply plugin: 'com.squareup.sqldelight'
    apply plugin: 'org.jetbrains.kotlin.android'
    // automatically adds…
    dependencies {
    api 'com.squareup.sqldelight:runtime-jdk:1.0.0'
    }X
    tasks.create('generateSqlDelight', SqlDelightTask) {
    // …
    }X
    tasks.getByName('compileKotlin').dependsOn('generateSqlDelight')

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  163. m
    u
    l
    t
    i
    p
    l
    a
    t
    f
    o
    r
    m
    apply plugin: 'com.squareup.sqldelight'
    apply plugin: 'org.jetbrains.kotlin.android'
    // automatically adds…
    dependencies {
    api 'com.squareup.sqldelight:runtime-jdk:1.0.0'
    }X
    tasks.create('generateDebugSqlDelight', SqlDelightTask) {
    // …
    }X
    tasks.getByName('compileDebugKotlin').dependsOn('generateDebugSqlDelight')
    tasks.create('generateReleaseSqlDelight', SqlDelightTask) {
    // …
    }X
    tasks.getByName('compileReleaseKotlin').dependsOn('generateReleaseSqlDelight')

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  164. tasks.getByName('compileDebugKotlin').dependsOn('generateDebugSqlDelight')
    tasks.getByName('compileReleaseKotlin').dependsOn('generateReleaseSqlDelight')
    m
    u
    l
    t
    i
    p
    l
    a
    t
    f
    o
    r
    m
    apply plugin: 'com.squareup.sqldelight'
    apply plugin: 'org.jetbrains.kotlin.android'
    // automatically adds…
    dependencies {
    api 'com.squareup.sqldelight:runtime-jdk:1.0.0'
    }X
    tasks.create('generateDebugSqlDelight', SqlDelightTask) { /* … */ }X
    tasks.create('generateReleaseSqlDelight', SqlDelightTask) { /* … */ }X
    tasks.create('verifySqlDelightMigration', VerifyMigrationTask) {
    // …
    }X

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  165. IntelliJ Plugin

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  166. IntelliJ Plugin

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  167. IntelliJ Plugin

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  168. Gradle
    Plugin
    Compiler
    Generated
    Code
    IntelliJ
    Plugin

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  169. Gradle
    Plugin
    Compiler
    Generated
    Code
    IntelliJ
    Plugin

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  170. Gradle
    Plugin
    Compiler
    Generated
    Code
    IntelliJ
    Plugin

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  171. Gradle
    Plugin
    Compiler
    IntelliJ
    Plugin
    antlr
    SQLDelight 0.7

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  172. Gradle
    Plugin
    Compiler
    IntelliJ
    Plugin
    antlr
    PSI
    SQLDelight 0.7

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  173. Compiler
    Gradle
    Plugin
    IntelliJ
    Plugin
    PSI
    SQLDelight 1.0

    View Slide

  174. Compiler
    Gradle
    Plugin
    IntelliJ
    Plugin
    sqlite-psi
    SQLDelight 1.0

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  175. JavaScript

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  176. sqlite3.h
    ed
    Native
    Node? WASM? Vanilla JS?
    JavaScript
    Database
    Abstraction
    java.sql.*
    org.sqlite.* (xerial)
    Driver
    knarch.db
    Driver
    JDBC
    Driver
    JS
    Driver
    JVM
    Abstraction
    android.
    net.sqlc
    AndroidX
    SQLCipher Impl

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  177. sqlite3.h
    ed
    Native
    Node? WASM? Vanilla JS?
    JavaScript
    Database
    Abstraction
    java.sql.*
    org.sqlite.* (xerial)
    Driver
    knarch.db
    Driver
    JDBC
    Driver
    JVM
    Abstraction
    android.
    net.sqlc
    AndroidX
    SQLCipher Impl

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  178. Node
    WASM
    Vanilla JS
    runtime storage

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  179. Node
    WASM
    Vanilla JS
    sqlite3
    runtime storage

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  180. Node
    WASM
    Vanilla JS
    sqlite3
    sqlite-wasm
    runtime storage

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  181. Node
    WASM
    Vanilla JS
    sqlite3
    sqlite-wasm
    sql.js
    runtime storage

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  182. Node
    WASM
    Vanilla JS
    sqlite3
    sqlite-wasm
    sql.js
    filesystem
    runtime storage

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  183. Node
    WASM
    Vanilla JS
    sqlite3
    sqlite-wasm
    sql.js
    filesystem
    ???
    ???
    runtime storage

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  184. iOS

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  185. let firstPlace = playerQueries.withRanking(
    ranking: 1
    ).executeAsOne()

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  186. struct Player {A
    var id: NSNumber
    var name: String
    var country: String
    var ranking: NSNumber
    }A
    let firstPlace = playerQueries.withRanking(
    ranking: 1
    ).executeAsOne()

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  187. struct Player {A
    var id: NSNumber
    var name: String
    var country: String
    var ranking: NSNumber
    }A
    func createPlayer(id: NSNumber, name: String, country: String,
    ranking: NSNumber) -> Player {A
    return Player(id: id, name: name, country: country,
    ranking: ranking)
    }A
    let firstPlace = playerQueries.withRanking(
    ranking: 1
    ).executeAsOne()

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  188. struct Player {A
    var id: NSNumber
    var name: String
    var country: String
    var ranking: NSNumber
    }A
    func createPlayer(id: NSNumber, name: String, country: String,
    ranking: NSNumber) -> Player {A
    return Player(id: id, name: name, country: country,
    ranking: ranking)
    }A
    let firstPlace = playerQueries.withRanking(
    ranking: 1,
    mapper: createPlayer
    ).executeAsOne() as! Player

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  189. Generated
    Code
    SQL Delight
    SQLite
    Generated
    Swift Code
    Compiler

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  190. SQL Delight
    SQLite
    Compiler
    Generated
    Code
    Generated
    Swift Code

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  191. View Slide

  192. View Slide

  193. View Slide

  194. View Slide

  195. View Slide

  196. View Slide

  197. View Slide

  198. View Slide

  199. View Slide

  200. withRanking:
    SELECT name
    FROM player
    WHERE ranking = ?;
    insert:
    INSERT INTO player (name, country, ranking)
    VALUES (?, ?, ?);

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  201. withRanking:
    SELECT name
    WHERE ranking = ?;
    insert:
    (name, country, ranking)
    VALUES (?, ?, ?);
    FROM player
    INSERT INTO player

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  202. withRanking:
    SELECT name
    FROM player
    WHERE ranking = ?;
    insert:
    INSERT INTO player (name, country, ranking)
    VALUES (?, ?, ?);
    private inner class Insert {
    fun execute(): Long {
    val result = statement.execute()
    notifyQueries(queryWrapper.playerQueries.withRanking)
    return result
    }
    }

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  203. withRanking:
    SELECT name
    FROM player
    WHERE ranking = ?;
    insert:
    INSERT INTO player (name, country, ranking)
    VALUES (?, ?, ?);
    private inner class Insert {
    fun execute(): Long {
    val result = statement.execute()
    notifyQueries(queryWrapper.playerQueries.withRanking)
    return result
    }
    }
    private inner class Insert {
    fun execute(): Long {
    val result = statement.execute()
    notifyQueries(queryWrapper.playerQueries.withRanking)
    return result
    }
    }
    withRanking:
    SELECT name
    FROM player
    WHERE ranking = ?;
    insert:
    INSERT INTO player (name, country, ranking)
    VALUES (?, ?, ?);

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  204. withRanking:
    SELECT name
    FROM player
    WHERE ranking = ?;
    insert:
    INSERT INTO player (name, country, ranking)
    VALUES (?, ?, ?);
    private inner class Insert {
    fun execute(): Long {
    val result = statement.execute()
    notifyQueries(queryWrapper.playerQueries.withRanking)
    return result
    }
    }
    withRanking:
    SELECT name
    FROM player
    WHERE ranking = ?;
    insert:
    INSERT INTO player (name, country, ranking)
    VALUES (?, ?, ?);

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  205. Other SQL Dialects

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  206. 1.0!

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  207. 1.0! (RC)

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  208. github.com/square/sqldelight

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  209. github.com/square/sqldelight
    jakes.link/resurgence-of-sql
    jakes.link/embracing-sql

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  210. github.com/square/sqldelight
    jakes.link/resurgence-of-sql
    jakes.link/embracing-sql
    IntelliJ Plugins – Friday @ 15:15, Berlagezaal

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  211. @Strongolopolis
    @JakeWharton

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