データベースへの接続時にSQliteエラーが発生しました

Question

私はAndroidが新しく、SQliteデータベースを持つアプリケーションで作業しています。残念ながら、データベースからデータを取得する必要がある場合、アプリケーションは常にクラッシュします。私はエラーを見つけることができないので、ヒントや助けは非常に高く評価されるだろう。

Here'sアクティビティ：

import android.app.ListActivity; 
import android.content.DialogInterface; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 
import android.util.Log; 
import android.widget.ListAdapter; 
import android.widget.SimpleCursorAdapter; 

import java.util.ArrayList; 

import de.die_web_agenten.www.runinstant.db.TaskContract; 
import de.die_web_agenten.www.runinstant.db.TaskDBHelper; 

public class SecondListActivity extends ListActivity { 

    // declare class variables 
    private ArrayList<Item> m_parts = new ArrayList<Item>(); 
    private Runnable viewParts; 
    private ItemAdapter m_adapter; 
    private ListAdapter listAdapter; 
    private TaskDBHelper helper; 

    /** Called when the activity is first created. */ 
    public void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     // instantiate our ItemAdapter class 
     m_adapter = new ItemAdapter(this, R.layout.list_item, m_parts); 
     setListAdapter(m_adapter); 

     // here we are defining our runnable thread. 
     viewParts = new Runnable(){ 
      public void run(){ 
       handler.sendEmptyMessage(0); 
      } 
     }; 

     // here we call the thread we just defined - it is sent to the handler below. 
     Thread thread = new Thread(null, viewParts, "MagentoBackground"); 
     thread.start(); 
    } 

    private void updateUI() { 
     helper = new TaskDBHelper(SecondListActivity.this); 
     SQLiteDatabase sqlDB = helper.getReadableDatabase(); 
     Cursor cursor = sqlDB.query(TaskContract.TABLE, 
       new String[]{TaskContract.Columns._id, TaskContract.Columns.SCAN_RESULT, TaskContract.Columns.SCAN_RESULT_FORMAT 
         }, 
       null, null, null, null, null 
     ); 


     listAdapter = new SimpleCursorAdapter(
       this, 
       R.layout.task_view, 
       cursor, 
       new String[]{TaskContract.Columns.SCAN_RESULT_FORMAT, TaskContract.Columns.SCAN_RESULT, TaskContract.Columns._id}, 
       new int[]{R.id.taskTextView}, 
       0 
     ); 

     this.setListAdapter(listAdapter); 

    } 


    public void onClick(DialogInterface dialogInterface, int i, Cursor cursor) { 

     cursor.moveToLast(); 
     int keyIdOfRowToDelete = cursor.getInt(cursor.getColumnIndex(TaskContract.Columns._id)); 
     SQLiteDatabase sqlDB = null; 
     sqlDB.delete(TaskContract.TABLE, TaskContract.Columns._id + "=?", new String[]{String.valueOf(keyIdOfRowToDelete)}); 
     String sql = String.format("SELECT FROM %s WHERE %s = '%s'", 
       TaskContract.TABLE, 
       TaskContract.Columns.SCAN_RESULT, TaskContract.Columns.SCAN_RESULT_FORMAT); 
     //task); 
     //TaskContract.Columns.DESCRIPTION, 
     //description); 
     helper = new TaskDBHelper(SecondListActivity.this); 
     sqlDB = helper.getWritableDatabase(); 
     sqlDB.execSQL(sql); 
     updateUI(); 
    } 

    private Handler handler = new Handler() 
    { 

     public void handleMessage(Message msg) 
     { 



      // create some objects 
      // here is where you could also request data from a server 
      // and then create objects from that data. 
      helper = new TaskDBHelper(SecondListActivity.this); 
      SQLiteDatabase sqlDB = helper.getWritableDatabase(); 
      String sql = String.format("SELECT FROM %s", 
        TaskContract.TABLE, 
        TaskContract.Columns.SCAN_RESULT_FORMAT, 
        TaskContract.Columns.SCAN_RESULT 
      ); 
      sqlDB.execSQL(sql); 
      //updateUI(); 
      String contents = TaskContract.Columns.SCAN_RESULT; 
      String format = TaskContract.Columns.SCAN_RESULT_FORMAT; 

      //Intent SecondIntent = getIntent(); 
      //String contents = SecondIntent.getStringExtra("SCAN_RESULT"); 
      //String contents = SecondIntent.getStringExtra("SCAN_RESULT", contents); 
      //String format = SecondIntent.getStringExtra("SCAN_RESULT_FORMAT"); 
      //Intent intent = new Intent(); 
      //String contents = intent.getStringExtra("SCAN_RESULT"); 
      //String format = intent.getStringExtra("SCAN_RESULT_FORMAT"); 
      //setResult(RESULT_OK, intent); 


      m_parts.add(new Item(contents, format, 0)); 
      m_parts.add(new Item("MyItemName #2", "This is item #2", 0)); 
      m_parts.add(new Item(contents, format, 0)); 
      Log.d("CDebugTag", "Value: " + (contents)); 
      Log.d("DDebugTag", "Value: " + (format)); 
      //updateUI(); 
      //Log.d("DDebugTag", "Value: " + (format)); 
      /*m_parts.add(new Item("MyItemName", "This is item #3", 0)); 
      m_parts.add(new Item("MyItemName #2", "This is item #4", 0)); 
      m_parts.add(new Item("MyItemName", "This is item #5", 0)); 
      m_parts.add(new Item("MyItemName #2", "This is item #6", 0)); 
      m_parts.add(new Item("MyItemName", "This is item #7", 0)); 
      m_parts.add(new Item("MyItemName #2", "This is item #8", 0)); 
      m_parts.add(new Item("MyItemName", "This is item #9", 0)); 
      m_parts.add(new Item("MyItemName #2", "This is item #10", 0));*/ 


      m_adapter = new ItemAdapter(SecondListActivity.this, R.layout.list_item, m_parts); 

      // display the list. 
      setListAdapter(m_adapter); 
      //updateUI(); 
     } 
    }; 
} 

Here'sログキャットエラーメッセージ：

08-19 17:19:53.270 11362-11362/? E/AndroidRuntime: FATAL EXCEPTION: main 
                Process: de.die_web_agenten.www.runinstant, PID: 11362 
                android.database.sqlite.SQLiteException: near "FROM": syntax error (code 1): , while compiling: SELECT FROM SCANDATA 
                ################################################################# 
                Error Code : 1 (SQLITE_ERROR) 
                Caused By : SQL(query) error or missing database. 
                (near "FROM": syntax error (code 1): , while compiling: SELECT FROM SCANDATA) 
                ################################################################# 
                 at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
                 at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1093) 
                 at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:670) 
                 at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 
                 at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:59) 
                 at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31) 
                 at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1812) 
                 at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1743) 
                 at de.die_web_agenten.www.runinstant.SecondListActivity$2.handleMessage(SecondListActivity.java:111) 
                 at android.os.Handler.dispatchMessage(Handler.java:102) 
                 at android.os.Looper.loop(Looper.java:135) 
                 at android.app.ActivityThread.main(ActivityThread.java:5910) 
                 at java.lang.reflect.Method.invoke(Native Method) 
                 at java.lang.reflect.Method.invoke(Method.java:372) 
                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405) 
                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200) 

任意のヒントやヘルプは、おかげでいただければ幸いです！

Answer 1

クエリでは、選択されているものが指定されていません。あなたのSQLクエリの2回目の呼び出しで代わりExecSqlのの

SELECT [column list] FROM SCANDATA 

または

SELECT * FROM SCANDATA 

Answer 2

使用クエリ。 execSQLは、SELECTやその他のSQL文ではなく、データを返すSQL問合せを1つ実行します。