为什么我的数据库在添加新列后会崩溃？

时间：2012-06-15 18:30:49

标签： android database sqlite

我正在尝试将新列添加到SQLiteDatabase中，但每次尝试使用新列运行代码时都会崩溃。如果我只是添加新列，那么它运行正常但是当我尝试在代码中使用它时它会崩溃。有问题的值是KEY_END_TIME以及其中包含“end”一词的任何值。我尝试将它传递给与KEY_DATE_TIME完全相同的值，或多或少地在完全相同的上下文中使用它们以试图让它运行但它每次都会立即崩溃。任何帮助或建议将不胜感激。

/**
 * 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)

3 个答案:

答案 0 :(得分：1)

我认为问题在

"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);";

“）;”得到两次

答案 1 :(得分：1)

您的创建声明格式错误：

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

你有结束“）;”两次，因此添加KEY_END_TIME的行在create语句之外并且不会执行。

答案 2 :(得分：1)

你的sql创建字符串是错误的。像这样修改它：

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

请记住卸载然后重新安装您的应用，以便再次调用onCreate方法并重新创建数据库。

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