JOOQ pojos与一对多和多对多的关系

Question

我正在努力理解如何处理与JOOQ的一对多和多对多关系的pojos.

我存储由玩家创建的位置(一对多关系).一个位置可以容纳多个可能访问它的其他玩家(多对多).数据库布局归结为以下内容:

CREATE TABLE IF NOT EXISTS `Player` (
  `player-id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `player` BINARY(16) NOT NULL,
  PRIMARY KEY (`player-id`),
  UNIQUE INDEX `U_player` (`player` ASC))
ENGINE = InnoDB;

CREATE TABLE IF NOT EXISTS `Location` (
  `location-id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(32) CHARACTER SET 'utf8' COLLATE 'utf8_bin' NOT NULL,
  `player-id` INT UNSIGNED NOT NULL COMMENT '
  UNIQUE INDEX `U_name` (`name` ASC),
  PRIMARY KEY (`location-id`),
  INDEX `Location_Player_fk` (`player-id` ASC),
  CONSTRAINT `fk_location_players1`
    FOREIGN KEY (`player-id`)
    REFERENCES `Player` (`player-id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
ENGINE = InnoDB;

CREATE TABLE IF NOT EXISTS `location2player` (
  `location-id` INT UNSIGNED NOT NULL,
  `player-id` INT UNSIGNED NOT NULL,
  INDEX `fk_ location2player_Location1_idx` (`location-id` ASC),
  INDEX `fk_location2player_Player1_idx` (`player-id` ASC),
  CONSTRAINT `fk_location2player_Location1`
    FOREIGN KEY (`location-id`)
    REFERENCES `Location` (`location-id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_location2player_Player1`
    FOREIGN KEY (`player-id`)
    REFERENCES `Player` (`player-id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

在我的java应用程序中,所有这些信息都存储在一个pojo中.请注意,播放器和受邀玩家列表可以在应用程序内更新,也需要在数据库中更新:

public class Location {

    private final String name;
    private UUID player;
    private List<UUID> invitedPlayers;

    public void setPlayer(UUID player) {
        this.player = player;
    }

    public void invitePlayer(UUID player) {
        invitedPlayers.add(player);
    }

    public void uninvitePlayer(UUID player) {
        invitedPlayers.remove(player);
    }

    //additional methods…
}

我可以使用JOOQ的pojo映射将这三个记录映射到单个pojo中吗？我可以使用此pojo中的JOOQ的CRUD功能来更新一对多和多对多的关系吗？如果不能使用pojo映射,除了用它来编写我的SQL语句之外,我能以任何方式利用JOOQ吗？

Answer 1

jOOQ还没有开箱即用的这种POJO映射,但是你可以利用像ModelMapper这样的东西,它具有专门的jOOQ集成,可以在一定程度上适用于这些场景.

从本质上讲,ModelMapper挂钩到jOOQ的RecordMapperAPI.更多细节在这里:

• http://www.jooq.org/doc/latest/manual/sql-execution/fetching/recordmapper/
• http://www.jooq.org/doc/latest/manual/sql-execution/fetching/pojos-with-recordmapper-provider/