我在更新数据时遇到了我的代码问题。在更新类中,id是错误的,我已经在DatabaseHelper类中声明了它,但它仍然是错误的。请检查我的代码。Android:更新数据
My DatabaseHelper class:
public boolean updateData(long id, String new_question, String new_ans1, String new_ans2, String new_ans3, String new_ans4, SQLiteDatabase sqLiteDatabase)
{
ContentValues contentValues = new ContentValues();
contentValues.put(AdminContact.Question.COLUMN_QUESTION, new_question);
contentValues.put(AdminContact.Question.COLUMN_ANSWER1, new_ans1);
contentValues.put(AdminContact.Question.COLUMN_ANSWER2, new_ans2);
contentValues.put(AdminContact.Question.COLUMN_ANSWER3, new_ans3);
contentValues.put(AdminContact.Question.COLUMN_ANSWER4, new_ans4);
// String selection = AdminContact.Question.TABLE_QUIZ + " LIKE ?";
//String[] selection_arg = {new_question};
int i = sqLiteDatabase.update(AdminContact.Question.TABLE_QUIZ, contentValues, AdminContact.Question.ID + "=" + id, null);
return i > 0;
}
upgrade class:
public void updateData(View view)
{
helper = new DatabaseHelper(this);
sqLiteDatabase = helper.getWritableDatabase();
String question, ans1, ans2, ans3, ans4;
question = New_Question.getText().toString();
ans1 = New_Ans1.getText().toString();
ans2 = New_Ans2.getText().toString();
ans3 = New_Ans3.getText().toString();
ans4 = New_Ans4.getText().toString();
helper.updateData(id,question,ans1,ans2,ans3,ans4,sqLiteDatabase);
Toast.makeText(getApplicationContext()," Successfully Updated", Toast.LENGTH_LONG).show();
finish();
}
}
更新数据时你会得到什么错误.. – Meenal
当我点击按钮更新时,它只会回到上一页,并且没有任何数据变化。 –
在你的选择字符串,我认为必须有一些列名..不是一个表名.. – Meenal