Question

我是Android编程的新手，我一直坚持从SQLite DB中检索数据并在TextView / ListView中的应用程序中显示它。我尝试了很多方法，但我只是在圈子里奔跑..欢迎任何方向！感谢。

Main.java：

public void LoadIngredient1() { 
    TestAdapter mDbHelper = new TestAdapter(this);         
    mDbHelper.createDatabase();       
    mDbHelper.open(); 

    // TO DO ?      

    mDbHelper.close();
}

TestAdapter.java：

public Cursor getData() {      
  String sql ="SELECT ID_Ingredient1, Ingredient1, tmp FROM Ingredient_1"; 
  Cursor mCur = mDb.rawQuery(sql, null); 
  if (mCur!=null) 
  { 
    mCur.moveToNext(); 
  } 
 return mCur; 
}

Answer 1

你为什么试图获得光标？我只想构建一个返回的对象。这里是一些示例代码： TestAdapter.java

    public class TestAdapter extends SQLiteOpenHelper {
        public TestAdapter(Context context) {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
        }
        ...
        public YourObject getData() {
            YourObject yourObject = new YourObject();
            String sql ="SELECT ID_Ingredient1, Ingredient1, tmp FROM Ingredient_1"; 
            SQLiteDatabase mDb = this.getWritableDatabase();
            Cursor mCur = mDb.rawQuery(sql, null); 
            if (mCur.moveToFirst()) { 
                yourObject.setId(cursor.getInt(cursor.getColumnIndex(ID_Ingredient1)));
                yourObject.setIngridient(cursor.getString(cursor.getColumnIndex(ID_Ingredient1)));
                ...
            } 
            return yourObject; 
        }
}

Answer 2

    public ArrayList<MyDataObject> getData(){
    ArrayList<MyDataObject> result = new ArrayList<MyDataObject>();
    open database
    Cursor c = null;
    try{
   c = database.rawQuery("Select * from myDataObjectTable",null);
    while(c!=null && c.moveToNext()){
      MyDataObject object = new MyDataObject();

    object.setId(c.getInt(c.getColumnIndex("ID Column")));
    object.setName(c.getString(c.getColumnIndex("Name")));
    object.setSomething(c.getBoolean(c.getColumnIndex("SOMETHING THERE COLUMN")));

    result.add(object);

    }

}catch(Exception e){
 Log.d(TAG,"some error",e);
} finally{

if(c!=null) c.close();
}
    return result;

    }

Answer 3

最后我找到了解决方案。我找到了这个教程：http://mobisys.in/blog/tag/shipping-of-external-database-to-application/感谢您的帮助！

Eclipse显示SQLite DB中的所有项目

3 个答案: