1

現在hsqldbを使用しています。私の作成ステートメントは次のようになります。

CREATE TABLE Movie
(
    movieId INTEGER GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
    title VARCHAR(255) NOT NULL,
);

CREATE TABLE Playlist(
    id INTEGER GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
);

CREATE TABLE PlaylistMovies(
    mid INTEGER FOREIGN KEY REFERENCES Movie(movieid),
    pid INTEGER FOREIGN KEY REFERENCES Playlist(id),     
    PRIMARY KEY (mid, pid)
);
//my assoziation table which safes the movie ids and playlist ids


alter table playlistmovies
   add constraint fk_plm_playlist
   foreign key (pid, mid) references playlist(id)
   on delete cascade;

私がやりたいとき：

INSERT INTO PlaylistMovies(MID, PID) VALUES (1,1);

私は得る：

ここに画像の説明を入力

ただし、データは他の 2 つのテーブルに存在するため、参照は可能でしょうか?

ここでの問題とそれを解決する方法は何ですか?

アップデート：

私が使用するバージョン: hsqldb-2.2.8

java.sql.SQLException: java.lang.ArrayIndexOutOfBoundsException: 1 java.lang.Arr
ayIndexOutOfBoundsException: 1
        at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
        at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
        at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source)
        at org.hsqldb.jdbc.JDBCStatement.execute(Unknown Source)
        at org.hsqldb.util.DatabaseManagerSwing.executeSQL(Unknown Source)
        at org.hsqldb.util.DatabaseManagerSwing.access$1000(Unknown Source)
        at org.hsqldb.util.DatabaseManagerSwing$StatementExecRunnable.run(Unknow
n Source)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721)
        at java.awt.EventQueue.access$200(EventQueue.java:103)
        at java.awt.EventQueue$3.run(EventQueue.java:682)
        at java.awt.EventQueue$3.run(EventQueue.java:680)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDo
main.java:76)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:691)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThre
ad.java:244)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.
java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:151)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)

        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)

        at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)
java.sql.SQLException: java.lang.ArrayIndexOutOfBoundsException: 1 java.lang.Arr
ayIndexOutOfBoundsException: 1
        at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
        at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
        at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source)
        at org.hsqldb.jdbc.JDBCStatement.execute(Unknown Source)
        at org.hsqldb.util.DatabaseManagerSwing.executeSQL(Unknown Source)
        at org.hsqldb.util.DatabaseManagerSwing.access$1000(Unknown Source)
        at org.hsqldb.util.DatabaseManagerSwing$StatementExecRunnable.run(Unknow
n Source)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721)
        at java.awt.EventQueue.access$200(EventQueue.java:103)
        at java.awt.EventQueue$3.run(EventQueue.java:682)
        at java.awt.EventQueue$3.run(EventQueue.java:680)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDo
main.java:76)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:691)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThre
ad.java:244)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.
java:163)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:151)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)

        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)

        at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)

更新 2:

わかりました、皆さん、

少し試してみたところ、変更テーブルを作成しないとフィールドを簡単に挿入できることがわかりました...

4

1 に答える 1

1

このステートメントにはエラーがあり、HSQLDB によって拒否されます。

alter table playlistmovies
add constraint fk_plm_playlist
foreign key (pid, mid) references playlist(id) -- mistake, FK has two columns, PK has one column
on delete cascade;

受け入れられますが、その後、値を挿入しようとすると、元のエラーによって例外が発生します (更新: この問題は HSQLDB 2.3.0 で修正され、元のステートメントが拒否されます)。

1 つの列しか持たない PK を参照する 2 つの列に FK を設定することはできません

ON DELETE CASCADE を元の CREATE TABLE に追加できます

CREATE TABLE PlaylistMovies(
mid INTEGER FOREIGN KEY REFERENCES Movie(movieid) ON DELETE CASCADE,
pid INTEGER FOREIGN KEY REFERENCES Playlist(id) ON DELETE CASCADE,     
PRIMARY KEY (mid, pid)
);
于 2012-12-10T12:49:22.493 に答える