找不到sql表 - android

Question

我對我的sql數據庫有問題。

我正在使用現有的sql數據庫，但它沒有被程序讀取。

我的SQL表如下：

BEGIN TRANSACTION; 
CREATE TABLE "android_metadata" ("locale" TEXT DEFAULT 'en_US'); 
INSERT INTO android_metadata VALUES('en_US'); 
CREATE TABLE bucketitems (
    "_id" INTEGER PRIMARY KEY NOT NULL, 
    "bucketNo" INTEGER NOT NULL, 
    "bucketItemName" TEXT NOT NULL, 
    "bucketItemImg" TEXT, 
    "bucketItemDesc" TEXT, 
    "completed" INTEGER NOT NULL 
); 
INSERT INTO bucketitems VALUES(1,1,'Test',NULL,NULL,0); 
COMMIT; 

我把SQL文件中的資源文件夾。

然後使用此代碼

public class DatabaseHandler extends SQLiteOpenHelper { 

    // Contacts table name 
    private static final String TABLE_BUCKET_ITEMS = "bucketitems"; 

    // Contacts Table Columns names 
    private static final String KEY_ID = "_id"; 
    private static final String KEY_BUCKET = "bucketNo"; 
    private static final String KEY_NAME = "bucketItemName"; 
    private static final String KEY_FLAG = "completed"; 

    private static String DB_PATH = "/data/data/com.example.bucketlist/databases/"; 

    private static String DB_NAME = "bucketList"; 

    private SQLiteDatabase myDataBase; 

    private final Context myContext; 

    public DatabaseHandler(Context context) { 
     super(context, DB_NAME, null, 1); 
     this.myContext = context; 
    } 


    //Creates a empty database on the system and rewrites it with your own database. 
    public void createDataBase() throws IOException { 
     boolean dbExist = checkDataBase(); 
     if (dbExist) { 
     } else { 
      this.getReadableDatabase(); 
      try { 
       this.close(); 
       copyDataBase(); 
      } catch (IOException e) { 
       throw new Error("Error copying database"); 
      } 
     } 
    } 

    // Check if the database already exist to avoid re-copying the file 
    private boolean checkDataBase() { 
     SQLiteDatabase checkDB = null; 
     try { 
      String myPath = DB_PATH + DB_NAME; 
      checkDB = SQLiteDatabase.openDatabase(myPath, null, 
        SQLiteDatabase.OPEN_READWRITE); 
     } catch (SQLiteException e) { 
     } 
     if (checkDB != null) { 
      checkDB.close(); 
     } 
     return checkDB != null ? true : false; 
    } 

    // Copies your database from your local assets-folder to the just created 
    private void copyDataBase() throws IOException { 
     InputStream myInput = myContext.getAssets().open(DB_NAME); 
     String outFileName = DB_PATH + DB_NAME; 
     OutputStream myOutput = new FileOutputStream(outFileName); 
     byte[] buffer = new byte[1024]; 
     int length; 
     while ((length = myInput.read(buffer)) > 0) { 
      myOutput.write(buffer, 0, length); 
     } 
     myOutput.flush(); 
     myOutput.close(); 
     myInput.close(); 
    } 

    public void openDataBase() throws SQLException { 
     String myPath = DB_PATH + DB_NAME; 
     myDataBase = SQLiteDatabase.openDatabase(myPath, null, 
       SQLiteDatabase.OPEN_READWRITE); 
    } 

    @Override 
    public synchronized void close() { 
     if (myDataBase != null) 
      myDataBase.close(); 
     super.close(); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     db.execSQL("DROP TABLE IF EXISTS " + TABLE_BUCKET_ITEMS); 
     onCreate(db); 
    } 

    // Getting All Contacts 
    public Bucket[] getAllContacts(int bucketNo) { 
     List<BucketItem> bucketList = new ArrayList<BucketItem>(); 

     String selectQuery = "SELECT * FROM " + TABLE_BUCKET_ITEMS + " WHERE " 
       + KEY_BUCKET + " = " + bucketNo; 

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

     if (cursor.moveToFirst()) { 
      do { 
       BucketItem bucket = new BucketItem(); 
       bucket.setBucketItemNo(Integer.parseInt(cursor.getString(0))); 
       bucket.setBucketItemName(cursor.getString(2)); 
       Boolean isCompleted = false; 
       if (Integer.parseInt(cursor.getString(5)) == 0) { 
        isCompleted = true; 
       } 
       bucket.setCompleted(isCompleted); 
       bucketList.add(bucket); 
      } while (cursor.moveToNext()); 
     } 

     Bucket[] buckets = bucketList.toArray(new Bucket[bucketList.size()]); 

     return buckets; 
    } 

    //Updating BucketItem 
    public int updateContact(BucketItem bucketItem) { 
     SQLiteDatabase db = this.getWritableDatabase(); 

     ContentValues values = new ContentValues(); 
     values.put(KEY_NAME, bucketItem.getBucketItemName()); 
     values.put(KEY_FLAG, bucketItem.isCompleted()); 

     // updating row 
     return db.update(TABLE_BUCKET_ITEMS, values, KEY_ID + " = ?", 
       new String[] { String.valueOf(bucketItem.getBucketItemNo()) }); 
    } 

然後在我的活動課，我的代碼如下。

@覆蓋

protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_bucket_item); 
     int value = getIntent().getExtras().getInt("bucketno"); 
     DatabaseHandler myDbHelper = new DatabaseHandler(this); 
     try { 
       myDbHelper.createDataBase(); 
     } catch (IOException ioe) { 
      throw new Error("Unable to create database"); 
     } 

     try { 
      myDbHelper.openDataBase(); 
     }catch(SQLException sqle){ 
      throw sqle; 
     } 
     Bucket[] buckets = myDbHelper.getAllContacts(value); 
     System.out.println(buckets); 

    } 

，但我有一個錯誤。

12-26 09:34:17.667: E/SQLiteLog(792): (1) no such table: bucketitems 
12-26 09:34:24.030: D/AndroidRuntime(792): Shutting down VM 
12-26 09:34:24.030: W/dalvikvm(792): threadid=1: thread exiting with uncaught exception (group=0x40a70930) 
12-26 09:34:24.166: E/AndroidRuntime(792): FATAL EXCEPTION: main 
12-26 09:34:24.166: E/AndroidRuntime(792): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.bucketlist/com.example.bucketlist.BucketItemActivity}: android.database.sqlite.SQLiteException: no such table: bucketitems (code 1): , while compiling: SELECT * FROM bucketitems WHERE bucketNo = 1 
12-26 09:34:24.166: E/AndroidRuntime(792): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 
12-26 09:34:24.166: E/AndroidRuntime(792): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 

請幫忙。 謝謝。

Answer 1

從資產複製時，您忘記了追加「.db」。
輸入應該是這樣的InputStream is = getContext().getAssets().open("MyDatabaseFile.db");
和輸出應該是這樣的OutputStream os = new FileOutputStream("/data/data/YOUR_PACKAGE_NAME/databases/MyDatabaseFile.db");

// Copies your database from your local assets-folder to the just created 
    private void copyDataBase() throws IOException { 
     InputStream myInput = myContext.getAssets().open(DB_NAME + ".db"); // add .db here and see 
     String outFileName = DB_PATH + DB_NAME + ".db"; // same here 
     OutputStream myOutput = new FileOutputStream(outFileName); 
     byte[] buffer = new byte[1024]; 
     int length; 
     while ((length = myInput.read(buffer)) > 0) { 
      myOutput.write(buffer, 0, length); 
     } 
     myOutput.flush(); 
     myOutput.close(); 
     myInput.close(); 
    }