相关疑难解决方法(0)

我们尝试sqlite_sequence使用以下代码进行更新.

WeNoteRoomDatabase weNoteRoomDatabase = WeNoteRoomDatabase.instance();
weNoteRoomDatabase.query(new SimpleSQLiteQuery("UPDATE sqlite_sequence SET seq = 0 WHERE name = 'attachment'"));

但是,它完全没有效果.我sqlite_sequence使用SQLite浏览器检查表内容.计数器未重置为0.

如果我们尝试在同一个SQLite文件上使用SQLite浏览器手动运行相同的查询,它就可以正常工作.

我们的房间数据库非常简单.

@Database(
    entities = {Attachment.class},
    version = 6
)
public abstract class WeNoteRoomDatabase extends RoomDatabase {
    private volatile static WeNoteRoomDatabase INSTANCE;

    private static final String NAME = "wenote";

    public abstract AttachmentDao attachmentDao();

    public static WeNoteRoomDatabase instance() {
        if (INSTANCE == null) {
            synchronized (WeNoteRoomDatabase.class) {
                if (INSTANCE == null) {
                    INSTANCE = Room.databaseBuilder(
                        WeNoteApplication.instance(),
                        WeNoteRoomDatabase.class,
                        NAME
                    )
                        .build(); …

如何在Ormlite中更新表sqlite_sequence？我只需要更新seq.如何通过ORMLite获取该表？

编辑

我找不到ORLite工具来做这个,所以我使用简单的sqlite查询.在我的类扩展OrmLiteSqliteOpenHelper我使用SQLiteDatabase进行更新.

EDIT2;)

在我的项目中,我坚持课课和课堂定义.

class Lesson{
    @DatabaseField(generatedId=true)
    private int id;
    ...
}

class WeekDefinitions{
    @DatabaseField(generatedId=true)
    private int id;
    @DatabaseField(foreign=true, columnName="lesson_id")
    private Lesson lesson;
    ...
}

现在,当我添加新课程时,id是递增的.例如

id = 1 Math
id = 2 English
id = 3 Medicine

并在weekDefinition中:

id = 1 lesson_id = 1  nr = 20
id = 2 lesson_id = 1  nr = 22
id = 3 lesson_id = 2  nr = 32
...
id = 12 lesson_id = 3  nr = 3

SQLite将此行添加到sqlite_sequence中(使用autoincrement时)

rowId = …

我需要截断房间数据库中的一个表。或者我需要将自动增量键重置为 0。有什么办法可以做到这一点。