Question

我按照此更新了我的数据库：Android SQLite: Update Statement

它运行良好，但是当我运行我的应用程序时，它崩溃说：不幸的是你的应用程序已停止工作。

以下是我的日志输出：

android.database.sqlite.SQLiteException: no such table: users (code 1): , while compiling: UPDATE users SET total_usage=? WHERE email =myemail
            at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
            at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1113)
            at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:690)
            at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
            at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
            at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
            at android.database.sqlite.SQLiteDatabase.updateWithOnConflict(SQLiteDatabase.java:1688)
            at android.database.sqlite.SQLiteDatabase.update(SQLiteDatabase.java:1636)
            at com.example.userX.theneckoptimizer.library.DatabaseHandler.updateUser(DatabaseHandler.java:92)
            at com.example.userX.theneckoptimizer.background$1.onFinish(background.java:101)
            at android.os.CountDownTimer$1.handleMessage(CountDownTimer.java:118)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:157)
            at android.app.ActivityThread.main(ActivityThread.java:5335)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
            at dalvik.system.NativeStart.main(Native Method)

执行onFinish（）时，我开始调用更新函数：

   public void onFinish() {
                MyActivity.amountOfVibrations= MyActivity.amountOfVibrations+ 1;
                Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
                vibrator.vibrate(500); //0.5 seconds of vibration

                DatabaseHandler db = new DatabaseHandler(getApplicationContext());
                db.updateUser(RegisterActivity.email, "123456");
             } // email = myemail

db.UpdateUser函数如下：

public void updateUser(String email, String total_usage) {
    SQLiteDatabase db = this.getWritableDatabase();

    String strFilter = "email =" + email;
    ContentValues args = new ContentValues();
    args.put(KEY_TOTAL_USAGE, total_usage);
    db.update("users", args, strFilter, null);

}

我尝试更新一行：total_usage，其中column：email。

更新某些数据是我的应用程序中最重要的部分。

为什么日志会提供此输出：

while compiling: UPDATE users SET total_usage=? WHERE email =myemail

我真的希望有人可以帮助我。我尝试了10个多小时来解决这个问题..

Answer 1

变化：

String strFilter = "email =" + email;

为：

String strFilter = "email";

并改变：

db.update("users", args, strFilter, null);

为：

db.update("users", args, strFilter, new String[] { email });

使用SQLite在Android应用程序中更新数据库

1 个答案: