我有一个图书课:
public class Book extends SugarRecord {
private String mBookName;
private String mAuthorName;
private List<Page> mPageList;
public Book() {
}
public Book(String bookname, String authorName) {
mBookName = bookname;
mAuthorName = authorName;
mPageList = new ArrayList<>();
}
public String getAuthorName() {
return mAuthorName;
}
public void setAuthorName(String authorName) {
mAuthorName = authorName;
}
public String getBookName() {
return mBookName;
}
public void setBookName(String bookName) {
mBookName = bookName;
}
public void addPage(Page page) {
mPageList.add(page);
}
}
和页面类:
public class Page extends SugarRecord {
private String mText;
public Page() {
}
public Page(String text) {
mText = text;
}
public String getText() {
return mText;
}
public void setText(String text) {
mText = text;
}
}
我正在用这个测试它:
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Book book = new Book("Some Book Title", "John Doe");
Page page1 = new Page("Once upon a time there was a very lonely bunny who wanted some friends.");
Page page2 = new Page("So he found some friends, and everyone was happy.");
Page page3 = new Page("The end!");
book.addPage(page1);
book.addPage(page2);
book.addPage(page3);
book.save();
}
}
但是它没有按预期工作。它正在努力使mPageList
它自己的专栏与这个.schema:
CREATE TABLE BOOK ( ID INTEGER PRIMARY KEY AUTOINCREMENT , M_AUTHOR_NAME TEXT, M_BOOK_NAME TEXT, M_PAGE_LIST );
我真正希望它做的不是将列表视为自己的列,而是将页面保存到 PAGE 表中,并使用引用此 Book 类的附加 id (所以我期望的是类似的东西)ID, BOOK_ID, M_TEXT
)。简而言之,通过嵌套子对象级联的持久性操作。
这可以在 SugarORM 中完成吗?