爲什麼我的數據庫在添加新列後崩潰？

我正在嘗試在SQLiteDatabase中添加一個新列，但每次嘗試運行帶有新列的代碼時，它都會崩潰。如果我只是添加新列，那麼它運行正常，但是當我嘗試在代碼中使用它時，它會崩潰。有問題的值是KEY_END_TIME以及其中包含單詞「end」的任何值。我嘗試傳遞與KEY_DATE_TIME相同的精確值，或多或少地在完全相同的上下文中使用它們，以嘗試使其運行，但每次都立即崩潰。任何幫助或建議將不勝感激。爲什麼我的數據庫在添加新列後崩潰？

/** 
* Simple reminder database access helper class. 
* Defines the basic CRUD operations (Create, Read, Update, Delete) 
* for the example, and gives the ability to list all reminders as well as 
* retrieve or modify a specific reminder. 
* 
*/ 
public class RemindersDbAdapter { 

// 
// Databsae Related Constants 
// 
private static final String DATABASE_NAME = "data"; 
private static final String DATABASE_TABLE = "reminders"; 
private static final int DATABASE_VERSION = 4; 

public static final String KEY_TITLE = "title"; 
public static final String KEY_CUSTOMER = "body"; 
public static final String KEY_DATE_TIME = "reminder_date_time"; 
public static final String KEY_END_TIME = "reminder_end_time"; 
public static final String KEY_ROWID = "_id"; 


private static final String TAG = "ReminderDbAdapter"; 
private DatabaseHelper mDbHelper; 
private SQLiteDatabase mDb; 

/** 
* Database creation SQL statement 
*/ 
private static final String DATABASE_CREATE = 
     "create table " + DATABASE_TABLE + " (" 
       + KEY_ROWID + " integer primary key autoincrement, " 
       + KEY_TITLE + " text not null, " 
       + KEY_CUSTOMER + " text not null, " 
       + KEY_DATE_TIME + " text not null);" 
       + KEY_END_TIME + " text not null);"; 



private final Context mCtx; 

private static class DatabaseHelper extends SQLiteOpenHelper { 

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

    @Override 
    public void onCreate(SQLiteDatabase db) { 

     db.execSQL(DATABASE_CREATE); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     Log.w(TAG, "Upgrading database from version " + oldVersion + " to " 
       + newVersion + ", which will destroy all old data"); 

     db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE); 
     onCreate(db); 
    } 
} 

/** 
* Constructor - takes the context to allow the database to be 
* opened/created 
* 
* @param ctx the Context within which to work 
*/ 
public RemindersDbAdapter(Context ctx) { 
    this.mCtx = ctx; 
} 

/** 
* Open the database. If it cannot be opened, try to create a new 
* instance of the database. If it cannot be created, throw an exception to 
* signal the failure 
* 
* @return this (self reference, allowing this to be chained in an 
*   initialization call) 
* @throws SQLException if the database could be neither opened or created 
*/ 
public RemindersDbAdapter open() throws SQLException { 
    mDbHelper = new DatabaseHelper(mCtx); 
    mDb = mDbHelper.getWritableDatabase(); 
    return this; 
} 

public void close() { 
    mDbHelper.close(); 
} 


/** 
* Create a new reminder using the title, body and reminder date time provided. 
* If the reminder is successfully created return the new rowId 
* for that reminder, otherwise return a -1 to indicate failure. 
* 
* @param title the title of the reminder 
* @param body the body of the reminder 
* @param reminderDateTime the date and time the reminder should remind the user 
* @return rowId or -1 if failed 
*/ 
public long createReminder(String title, String body, String reminderDateTime, String  reminderEndTime) { 
    ContentValues initialValues = new ContentValues(); 
    initialValues.put(KEY_TITLE, title); 
    initialValues.put(KEY_CUSTOMER, body); 
    initialValues.put(KEY_DATE_TIME, reminderDateTime); 
    initialValues.put(KEY_END_TIME, reminderDateTime); 

    return mDb.insert(DATABASE_TABLE, null, initialValues); 
} 

/** 
* Delete the reminder with the given rowId 
* 
* @param rowId id of reminder to delete 
* @return true if deleted, false otherwise 
*/ 
public boolean deleteReminder(long rowId) { 

    return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0; 
} 

/** 
* Return a Cursor over the list of all reminders in the database 
* 
* @return Cursor over all reminders 
*/ 
public Cursor fetchAllReminders() { 

    return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_TITLE, 
      KEY_CUSTOMER, KEY_DATE_TIME, KEY_END_TIME}, null, null, null, null, null); 
} 

/** 
* Return a Cursor positioned at the reminder that matches the given rowId 
* 
* @param rowId id of reminder to retrieve 
* @return Cursor positioned to matching reminder, if found 
* @throws SQLException if reminder could not be found/retrieved 
*/ 
public Cursor fetchReminder(long rowId) throws SQLException { 

    Cursor mCursor = 

      mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID, 
        KEY_TITLE, KEY_CUSTOMER, KEY_DATE_TIME, KEY_END_TIME}, KEY_ROWID +  "=" + rowId, null, 
        null, null, null, null); 
    if (mCursor != null) { 
     mCursor.moveToFirst(); 
    } 
    return mCursor; 

} 

/** 
* Update the reminder using the details provided. The reminder to be updated is 
* specified using the rowId, and it is altered to use the title, body and reminder  date time 
* values passed in 
* 
* @param rowId id of reminder to update 
* @param title value to set reminder title to 
* @param body value to set reminder body to 
* @param reminderDateTime value to set the reminder time. 
* @return true if the reminder was successfully updated, false otherwise 
*/ 
public boolean updateReminder(long rowId, String title, String body, String reminderDateTime, String reminderEndTime) { 
    ContentValues args = new ContentValues(); 
    args.put(KEY_TITLE, title); 
    args.put(KEY_CUSTOMER, body); 
    args.put(KEY_DATE_TIME, reminderDateTime); 
    args.put(KEY_END_TIME, reminderEndTime); 

    return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0; 
}

}

06-15 18:11:12.356: E/AndroidRuntime(790): FATAL EXCEPTION: main 
06-15 18:11:12.356: E/AndroidRuntime(790): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dummies.android.TaskReminder/com.dummies.android.TaskReminder.TaskReminderActivity}: android.database.sqlite.SQLiteException: no such column: reminder_end_time: , while compiling: SELECT _id, title, body, reminder_date_time, reminder_end_time FROM reminders 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.app.ActivityThread.access$600(ActivityThread.java:123) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.os.Handler.dispatchMessage(Handler.java:99) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.os.Looper.loop(Looper.java:137) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.app.ActivityThread.main(ActivityThread.java:4424) 
06-15 18:11:12.356: E/AndroidRuntime(790): at java.lang.reflect.Method.invokeNative(Native Method) 
06-15 18:11:12.356: E/AndroidRuntime(790): at java.lang.reflect.Method.invoke(Method.java:511) 
06-15 18:11:12.356: E/AndroidRuntime(790): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
06-15 18:11:12.356: E/AndroidRuntime(790): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
06-15 18:11:12.356: E/AndroidRuntime(790): at dalvik.system.NativeStart.main(Native Method) 
06-15 18:11:12.356: E/AndroidRuntime(790): Caused by: android.database.sqlite.SQLiteException: no such column: reminder_end_time: , while compiling: SELECT _id, title, body, reminder_date_time, reminder_end_time FROM reminders 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:68) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:143) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:127) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:94) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:53) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1564) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1449) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1405) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1485) 
06-15 18:11:12.356: E/AndroidRuntime(790): at com.dummies.android.TaskReminder.RemindersDbAdapter.fetchAllReminders(RemindersDbAdapter.java:144) 
06-15 18:11:12.356: E/AndroidRuntime(790): at com.dummies.android.TaskReminder.TaskReminderActivity.fillData(TaskReminderActivity.java:40) 
06-15 18:11:12.356: E/AndroidRuntime(790): at com.dummies.android.TaskReminder.TaskReminderActivity.onCreate(TaskReminderActivity.java:33) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.app.Activity.performCreate(Activity.java:4465) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
06-15 18:11:12.356: E/AndroidRuntime(790): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)

來源

2012-06-15 user1457104

你增加了DATABASE_VERSION嗎？ –

如果您已經創建了一次數據庫和表，那麼'SQLiteOpenHelper'的'onCreate（...）'方法將不會再次運行。你確定你已經增加了數據庫版本號以確保'onUpgrade（）'運行？ – Squonk

是的，除非我做錯了，你所做的只是將DATABASE_VERSION從3改爲4吧？ – user1457104

你的sql創建字符串是錯誤的。修改這樣的：

...+ KEY_DATE_TIME + " text not null, " 
       + KEY_END_TIME + " text not null);";

記住要卸載，然後重新安裝應用程序，以便在onCreate方法再次被調用和數據庫重建。

來源

2012-06-15 18:41:57 Luksprog

在事後看來，它是一個愚蠢的錯誤。感謝您的幫助，這個網站是一個真正的生活救星！ – user1457104

我認爲問題

"create table " + DATABASE_TABLE + " (" 
     + KEY_ROWID + " integer primary key autoincrement, " 
     + KEY_TITLE + " text not null, " 
     + KEY_CUSTOMER + " text not null, " 
     + KEY_DATE_TIME + " text not null);" 
     + KEY_END_TIME + " text not null);";

「）;」獲得兩倍

來源

2012-06-15 18:39:58

您可能是對的，但有沒有更新它的具體方法？如果我只是更改 DATABASE_VERSION = 4，我是否更新了錯誤; DATABASE_VERSION = 5; ？ – user1457104

你的create語句是惡意形成的：

+ KEY_DATE_TIME + " text not null);" 
      + KEY_END_TIME + " text not null);";

你必須關閉「）;」兩次，所以添加KEY_END_TIME的行不在create語句中，並且未被執行。

來源

2012-06-15 18:41:43 Chris

爲什麼我的數據庫在添加新列後崩潰？

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