未定義的構造函數SQLite光標

Question

我正試圖在android上爲SQlite數據庫創建一個表。該表有5列，Int ID，URL鏈接，字符串標題，字符串描述和日期日期。

要構建我的代碼，我一直使用this和this作爲參考，但都沒有顯示如何添加除String之外的任何內容到遊標。

繼承人我的代碼：

public class Chapter { 

final SimpleDateFormat FORMATTER = 
     new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z"); 
    private String title; 
    private URL link; 
    private String description; 
    private Date date; 
    private int id; 

    //Constructor for table includes ID. 
    public Chapter(int id, URL link, String title, String description, Date date) { 
     this.id = id; 
     this.link = link; 
     this.title = title; 
     this.description = description; 
     this.date = date; 
    } 

    //Empty Constructor 
    public Chapter() { 
     // TODO Auto-generated constructor stub 
    } 

    public String getTitle() { 
     return title; 
    } 

    public void setTitle(String title) { 
     this.title = title.trim(); 
    } 
    // getters and setters omitted for brevity 
    public URL getLink() { 
     return link; 
    } 

    public void setLink(String link) { 
     try { 
      this.link = new URL(link); 
     } catch (MalformedURLException e) { 
      throw new RuntimeException(e); 
     } 
    } 

    public String getDescription() { 
     return description; 
    } 

    public void setDescription(String description) { 
     this.description = description.trim(); 
    } 

    public String getDate() { 
     return FORMATTER.format(this.date); 
    } 

    public void setDate(String date) { 
     // pad the date if necessary 
     while (!date.endsWith("00")){ 
      date += "0"; 
     } 
     date = ""; 
     try { 
      this.date = FORMATTER.parse(date.trim()); 
     } catch (ParseException e) { 
      throw new RuntimeException(e); 
     } 
    } 

    public Chapter copy(){ 
     Chapter copy = new Chapter(); 
     copy.title = title; 
     copy.link = link; 
     copy.description = description; 
     copy.date = date; 
     return copy; 
    } 

    @Override 
    public String toString() { 
     StringBuilder sb = new StringBuilder(); 
     sb.append("Title: "); 
     sb.append(title); 
     sb.append('\n'); 
     sb.append("Date: "); 
     sb.append(this.getDate()); 
     sb.append('\n'); 
     sb.append("Link: "); 
     sb.append(link); 
     sb.append('\n'); 
     sb.append("Description: "); 
     sb.append(description); 
     return sb.toString(); 
    } 

    @Override 
    public int hashCode() { 
     final int prime = 31; 
     int result = 1; 
     result = prime * result + ((date == null) ? 0 : date.hashCode()); 
     result = prime * result 
       + ((description == null) ? 0 : description.hashCode()); 
     result = prime * result + ((link == null) ? 0 : link.hashCode()); 
     result = prime * result + ((title == null) ? 0 : title.hashCode()); 
     return result; 
    } 

    @Override 
    public boolean equals(Object obj) { 
     if (this == obj) 
      return true; 
     if (obj == null) 
      return false; 
     if (getClass() != obj.getClass()) 
      return false; 
     Chapter other = (Chapter) obj; 
     if (date == null) { 
      if (other.date != null) 
       return false; 
     } else if (!date.equals(other.date)) 
      return false; 
     if (description == null) { 
      if (other.description != null) 
       return false; 
     } else if (!description.equals(other.description)) 
      return false; 
     if (link == null) { 
      if (other.link != null) 
       return false; 
     } else if (!link.equals(other.link)) 
      return false; 
     if (title == null) { 
      if (other.title != null) 
       return false; 
     } else if (!title.equals(other.title)) 
      return false; 
     return true; 
    } 

    public int compareTo(Chapter another) { 
     if (another == null) return 1; 
     // sort descending, most recent first 
     return another.date.compareTo(date); 
    } 

    public int getId() { 
     // TODO Auto-generated method stub 
     return id; 
    } 

    public void setId(int parseInt) { 
     // TODO Auto-generated method stub 
     this.id = id; 
    } 

    public void setImage(String string) { 
     // TODO Auto-generated method stub 

    } 

和我的助手類：

public class ChapterSQLiteOpenHelper extends SQLiteOpenHelper { 

private static final String DATABASE_NAME = "chaptertable"; 
    private static final int DATABASE_VERSION = 1; 

    // Database table 
    public static final String TABLE_CHAPTER = "Chapter"; 
    public static final String COLUMN_ID = "_id"; 
    public static final String COLUMN_LINK = "link"; 
    public static final String COLUMN_TITLE = "title"; 
    public static final String COLUMN_DESCRIPTION = "description"; 
    public static final String COLUMN_PUBDATE = "pubdate"; 
    public static final String COLUMN_IMAGEID = "imageid"; 

    // Database creation SQL statement 
    private static final String DATABASE_CREATE = "create table " 
     + TABLE_CHAPTER 
     + "(" 
     + COLUMN_ID + " integer primary key autoincrement, " 
     + COLUMN_LINK + " text not null, " 
     + COLUMN_TITLE + " text not null," 
     + COLUMN_DESCRIPTION + " text not null" 
     + COLUMN_PUBDATE + " text not null," 
     + COLUMN_IMAGEID + " text not null," 
     + ");"; 



    public ChapterSQLiteOpenHelper(Context context) { 
    super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    } 

    // Method is called during creation of the database 
    @Override 
    public void onCreate(SQLiteDatabase database) { 
     database.execSQL(DATABASE_CREATE); 
     } 

    // Method is called during an upgrade of the database, 
    // e.g. if you increase the database version 
    // Upgrading database 
    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     // Drop older table if existed 
     db.execSQL("DROP TABLE IF EXISTS " + TABLE_CHAPTER); 

     // Create tables again 
     onCreate(db); 
    } 


    /** 
    * All CRUD(Create, Read, Update, Delete) Operations 
    */ 

    // Adding new contact 
    void addContact(Chapter chapter) { 
     SQLiteDatabase db = this.getWritableDatabase(); 

     ContentValues values = new ContentValues(); 
     values.put(COLUMN_ID, chapter.getId()); // Chapter ID 
     values.put(COLUMN_LINK, chapter.getLink()); // Chapter Link 
     values.put(COLUMN_TITLE, chapter.getTitle()); // Chapter Title 
     values.put(COLUMN_DESCRIPTION, chapter.getDescription()); // Chapter Description 
     values.put(COLUMN_PUBDATE, chapter.getDate()); // Chapter Date 
     //values.put(COLUMN_IMAGEID, chapter.getImage()); // Chapter Image 

     // Inserting Row 
     db.insert(TABLE_CHAPTER, null, values); 
     db.close(); // Closing database connection 
    } 

    // Getting single contact 
    Chapter getChapter(int id) { 
     SQLiteDatabase db = this.getReadableDatabase(); 

     Cursor cursor = db.query(TABLE_CHAPTER, new String[] { COLUMN_ID, 
       COLUMN_ID, COLUMN_LINK }, COLUMN_ID + "=?", 
       new String[] { String.valueOf(id) }, null, null, null, null); 
     if (cursor != null) 
      cursor.moveToFirst(); 

     Chapter chapter = new Chapter(Integer.parseInt(cursor.getString(0)), cursor.getURL(1), cursor.getString(2), cursor.getString(3), cursor.getString(4)); 
     // return contact 
     return chapter; 
    } 

    // Getting All Contacts 
    public List<Chapter> getAllContacts() { 
     List<Chapter> chapterList = new ArrayList<Chapter>(); 
     // Select All Query 
     String selectQuery = "SELECT * FROM " + TABLE_CHAPTER; 

     SQLiteDatabase db = this.getWritableDatabase(); 
     Cursor cursor = db.rawQuery(selectQuery, null); 

     // looping through all rows and adding to list 
     if (cursor.moveToFirst()) { 
      do { 
       Chapter chapter = new Chapter(); 
       chapter.setId(Integer.parseInt(cursor.getString(0))); 
       chapter.setLink(cursor.getURL(1)); 
       chapter.setTitle(cursor.getString(2)); 
       chapter.setDescription(cursor.getString(3)); 
       chapter.setDate(cursor.getString(4)); 
       //chapter.setImage(cursor.getString(5)); 
       // Adding chapter to list 
       chapterList.add(chapter); 
      } while (cursor.moveToNext()); 
     } 

     // return contact list 
     return chapterList; 
    } 

    // Updating single contact 
    public int updateContact(Chapter chapter) { 
     SQLiteDatabase db = this.getWritableDatabase(); 

     ContentValues values = new ContentValues(); 
     values.put(COLUMN_ID, chapter.getId()); 
     values.put(COLUMN_LINK, chapter.getLink()); 
     values.put(COLUMN_TITLE, chapter.getTitle()); 
     values.put(COLUMN_DESCRIPTION, chapter.getDescription()); 
     values.put(COLUMN_PUBDATE, chapter.getDate()); 
     //values.put(COLUMN_IMAGEID, chapter.getImage()); 

     // updating row 
     return db.update(TABLE_CHAPTER, values, COLUMN_ID + " = ?", 
       new String[] { String.valueOf(chapter.getId()) }); 
    } 

    // Deleting single contact 
    public void deleteContact(Chapter chapter) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     db.delete(TABLE_CHAPTER, COLUMN_ID + " = ?", 
       new String[] { String.valueOf(chapter.getId()) }); 
     db.close(); 
    } 

    // Getting contacts Count 
    public int getChaptersCount() { 
     String countQuery = "SELECT * FROM " + TABLE_CHAPTER; 
     SQLiteDatabase db = this.getReadableDatabase(); 
     Cursor cursor = db.rawQuery(countQuery, null); 
     cursor.close(); 

     // return count 
     return cursor.getCount(); 
    } 

我得到彙編關於鏈接values.put線錯誤，章章=新的篇章......線。

Answer 1

您需要copy()方法一樣設置使用setter方法屬性：

public Chapter copy(){ 
    Chapter copy = new Chapter(); 
    copy.setTitle(this.title); 
    copy.setLink(this.link); 
    copy.setDescription(this.description); 
    copy.setDate(this.date); 
    return copy; 
}