java - 从sqlite android获取所有记录

Question

我正在创建一个数据库，我需要从数据库中读取所有记录，但是我的程序在这个语句中不断崩溃：

newWord= db.getAllRecords();

我认为 getAllRecords() 存在问题，因为 Eclipse 表示没有错误。

 public Cursor getAllRecords() {
 db = dBHelper.getWritableDatabase();//obtains the writable database
return db.query(DATABASE_TABLE, new String[] { KEY_ROWID,KEY_WORD}, null, null, null,      null, null);//the query used to obtain all records form the table

} 

有任何想法吗？

Answer 1

这是我从表格中获取所有内容的方法..

public ArrayList<MyObject> getAllElements() {

    ArrayList<MyObject> list = new ArrayList<MyObject>();

    // Select All Query
    String selectQuery = "SELECT  * FROM " + MY_TABLE;

    SQLiteDatabase db = this.getReadableDatabase();
    try {

        Cursor cursor = db.rawQuery(selectQuery, null);
        try {

            // looping through all rows and adding to list
            if (cursor.moveToFirst()) {
                do {
                    MyObject obj = new MyObject();
                    //only one column
                    obj.setId(cursor.getString(0));

                    //you could add additional columns here..

                    list.add(obj);
                } while (cursor.moveToNext());
            }

        } finally {
            try { cursor.close(); } catch (Exception ignore) {}
        }

    } finally {
         try { db.close(); } catch (Exception ignore) {}
    }

    return list;
}

Answer 2

public void printTableData(String table_name){
    SQLiteDatabase db = getReadableDatabase();

    Cursor cur = db.rawQuery("SELECT * FROM " + table_name, null);

    if(cur.getCount() != 0){
        cur.moveToFirst();

        do{
            String row_values = "";

            for(int i = 0 ; i < cur.getColumnCount(); i++){
                row_values = row_values + " || " + cur.getString(i);
            }

            Log.d("LOG_TAG_HERE", row_values);

        }while (cur.moveToNext());
    }
}

Answer 3

Initialize TABLE:
    private static String TABLE="your_table_name";

要获取所有记录的列表，请将以下方法写入您的数据库类：

public ArrayList<RecentStickerModel> getAllRecentRecords() {

    ArrayList<RecentStickerModel> listStickers = new ArrayList<>();

    SQLiteDatabase db = getWritableDatabase();

    String q = "SELECT name from sqlite_master WHERE type='table' AND name='" + TABLE + "'";
    Cursor cursorTable = db.rawQuery(q, null);

    if (cursorTable != null && cursorTable.moveToFirst()) {

        String tableName = cursorTable.getString(0);
        cursorTable.close();

        if (TABLE.equals(tableName)) {

            String query = "Select * from " + TABLE ;

            Cursor cursor = db.rawQuery(query, null);

            if (cursor != null && cursor.moveToFirst()) {

                Logger.e(TAG, "cursor size:" + cursor.getCount());

                int catNameCI = cursor.getColumnIndex(KEY_CAT_NAME);
                int imagePathCI = cursor.getColumnIndex(KEY_IMAGE_PATH);
                int lastStickerTimeCI = cursor.getColumnIndex(KEY_LAST_STICKER_TIME);


                do {

                    RecentStickerModel model = new RecentStickerModel();
                    model.setCatName(cursor.getString(catNameCI));
                    model.setImgStickerPath(cursor.getString(imagePathCI));
                    model.setLastStickerTime(cursor.getString(lastStickerTimeCI));


                    listStickers.add(model);
                } while (cursor.moveToNext());

                cursor.close();
            }
        }

        db.close();
    }

    return listStickers;
}

然后在需要的地方调用以下方法：

arrayListRecent=stickersListDatabase.getAllRecentRecords();

Answer 4

Cursor c = ourDatabase.rawQuery("SELECT * FROM table_name", null);
        if(c!=null){
            c.moveToFirst();
        }
        return c;