Java プログラム (単純な辞書) でデータを入力すると、エラーがスローされます。
MySQLIntegrityConstraintViolationException: 子行を追加または更新できません: 外部キー制約が失敗しました (
singlehaw
.card
, CONSTRAINTcard_ibfk_1
FOREIGN KEY (wordId
) REFERENCESword
(wordId
))
しかし、コマンドプロンプトでクエリを使用してデータを入力すると、問題は発生しません。
ここに私の方法を投稿します:
public boolean insert(Card card) {
Connection connection = MySqlUtils.getInstance().getConnection();
PreparedStatement statement = null;
ResultSet resultSet = null;
int cardId = -1;
try {
String INSERT_INTO_TABLE_CARD_QUERY = "INSERT INTO "
+ TBL_CARD + " ("
+ STATUS + ", "
+ RATING + ", "
+ INSERT_TIME + ", "
+ DIC_ID + ", "
+ WORD_ID
+ ") VALUES (?,?,NOW(),?,?)";
statement = connection.prepareStatement(INSERT_INTO_TABLE_WORDS_QUERY, Statement.RETURN_GENERATED_KEYS);
statement.setString(1, card.getStatus().name());
statement.setInt(2, card.getRating());
statement.setInt(3, card.getDictionaryId());
statement.setInt(4, card.getWordId());
statement.execute();
// get last inserted id
resultSet = statement.getGeneratedKeys();
if (resultSet.next())
cardId = resultSet.getInt(1);
} catch (SQLException e) {
e.printStackTrace();
return false;
} finally {
try {
if (connection != null)
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
card.setCardId(cardId);
return true;
}
また、テーブルを作成するスクリプト:
CREATE TABLE dictionary (
dictionaryId SERIAL,
dictionary VARCHAR(128) NOT NULL,
PRIMARY KEY (dictionaryId)
) ENGINE=INNODB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE word (
wordId SERIAL,
word VARCHAR(255) NOT NULL UNIQUE,
transcription VARCHAR(255),
PRIMARY KEY (wordId)
) ENGINE=INNODB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE card (
cardId SERIAL,
status ENUM ('EDIT', 'POSTPONED', 'TO_LEARN', 'LEARNT') NOT NULL DEFAULT 'TO_LEARN',
rating TINYINT DEFAULT '0' NOT NULL,
insert_time TIMESTAMP DEFAULT NOW(),
update_time TIMESTAMP,
dictionaryId BIGINT UNSIGNED NOT NULL,
wordId BIGINT UNSIGNED NOT NULL,
PRIMARY KEY (cardId),
FOREIGN KEY (wordId) REFERENCES word (wordId),
FOREIGN KEY (dictionaryId) REFERENCES dictionary (dictionaryId) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=INNODB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;