Question

我有两张桌子：

CREATE TABLE IF NOT EXISTS `mydb`.`league_ranking` (
  `id` INT NOT NULL,
  `position` INT NULL,
  `team_id` INT NULL,
  `season_id` INT NULL,
  `round_id` INT NULL,
  `competition_id` INT NULL,
  `group_id` INT NULL,
  `played_matches` INT NULL,
  `wins` INT NULL,
  `draws` INT NULL,
  `losses` INT NULL,
  `goals_for` INT NULL,
  `goals_against` INT NULL,
  `goals_difference` INT NULL,
  `points` INT NULL,
  PRIMARY KEY (`id`),
  INDEX `FK_competition_groups_form_ranking_group_id_idx` (`group_id` ASC),
  CONSTRAINT `FK_team_league_ranking_teamd_id`
    FOREIGN KEY (`id`)
    REFERENCES `mydb`.`team` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `FK_round_league_ranking_round_id`
    FOREIGN KEY (`id`)
    REFERENCES `mydb`.`round` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `FK_competition_league_ranking_competition_id`
    FOREIGN KEY (`id`)
    REFERENCES `mydb`.`competition` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `FK_competition_groups_league_ranking_group_id`
    FOREIGN KEY (`group_id`)
    REFERENCES `mydb`.`competition_groups` (`group_id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

CREATE TABLE IF NOT EXISTS `mydb`.`competition` (
  `id` INT NOT NULL,
  `country_id` INT NOT NULL,
  `name` VARCHAR(255) NOT NULL,
  `link` VARCHAR(255) NOT NULL,
  PRIMARY KEY (`id`),
  INDEX `id_idx` (`country_id` ASC),
  CONSTRAINT `FK_country_competition_country_id`
    FOREIGN KEY (`country_id`)
    REFERENCES `mydb`.`country` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

我正在尝试在league_ranking表中添加具有不同FK的记录。我在competition表中定义了一个具有以下字段值的记录：

id | country_id | name | link
13       89       foo     test

我以这种方式添加记录：

string query = "INSERT INTO league_ranking (position, team_id, season_id, 

round_id, competition_id, " +
"group_id, played_matches, wins, draws, losses, goals_for, goals_against, goals_difference, points) " +
"VALUES (@position, @team_id, @season_id, @round_id, @competition_id, @group_id, @played_matches, " +
"@wins, @draws, @losses, @goals_for, @goals_against, @goals_difference, @points)";

MySqlCommand = new MySqlCommand(query, MySqlConnection);
MySqlCommand.Parameters.AddWithValue("@position", tbl.Position);
MySqlCommand.Parameters.AddWithValue("@team_id", tbl.TeamId);
MySqlCommand.Parameters.AddWithValue("@season_id", seasonId);
MySqlCommand.Parameters.AddWithValue("@round_id", roundId);
MySqlCommand.Parameters.AddWithValue("@competition_id", compId);
MySqlCommand.Parameters.AddWithValue("@group_id", groupId);
MySqlCommand.Parameters.AddWithValue("@played_matches", tbl.PlayedMatches);
MySqlCommand.Parameters.AddWithValue("@wins", tbl.Wins);
MySqlCommand.Parameters.AddWithValue("@draws", tbl.Draws);
MySqlCommand.Parameters.AddWithValue("@losses", tbl.Losses);
MySqlCommand.Parameters.AddWithValue("@goals_for", tbl.GoalsFor);
MySqlCommand.Parameters.AddWithValue("@goals_against", tbl.GoalsAgainst);
MySqlCommand.Parameters.AddWithValue("@goals_difference", tbl.GoalDifference);
MySqlCommand.Parameters.AddWithValue("@points", tbl.Points);
MySqlCommand.ExecuteNonQuery();

我收到此错误：

MySql.Data.MySqlClient.MySqlException：'无法添加或更新子行：外键约束失败（mydb。league_ranking，CONSTRAINT FK_competition_league_ranking_competition_id FOREIGN KEY（{{1 }}）参考id（competition）ON更新没有动作更新没有行动''

现在id id competition_id的值和记录存在于13表中，我做错了什么？

Answer 1

在表mydb.league_ranking中定义外键时，您使用错误的列来引用competition表中的右列。

例如，不应使用id表格中的league，而应使用competition_id来引用id表格的competition。

同样，也可以使用其他列。

相应地重新定义league表，然后尝试插入语句。

约束失败但记录存在

1 个答案: