Question

查询中的问号不会被替换，我无法弄清楚原因我总是得到Query（在调试时查看）：

SELECT消息，时间戳

FROM chatMessage

在哪里chatId =？

ORDER BY timestamp ASC

LIMIT 5

在下面的代码中：

public ArrayList<String> queryLastMessages(String chatId, int count){
  SQLiteDatabase db = new DatabaseHelper(context).getReadableDatabase();

  String[] columns = {
            COLUMN_NAME_CHAT_MESSAGE,
            COLUMN_NAME_TIMESTAMP
    };

  String selection =  COLUMN_NAME_CHAT_ID + " = ?";

  String[] selectionArgs = {
            chatId
    };

  // ToDo: Ascending or Descending?
  Cursor cursor = db.query(
          TABLE_CHAT_MESSAGE,
          columns,
          selection,
          selectionArgs,
          null,
          null,
          COLUMN_NAME_TIMESTAMP + " ASC",
          String.valueOf(count));

  cursor.moveToFirst();

  ArrayList<String> arrayList = new ArrayList<>();
  if(cursor.getCount() != 0){
    while(!cursor.isAfterLast()){
      arrayList.add(cursor.getString(0));
      cursor.moveToNext();
    }
  }

  return arrayList;
}

任何想法我做错了什么？谢谢你的帮助。

雷

Answer 1

试试这个：

SQLiteStatement stmt = db.compileStatement(query);
stmt.bindString(1, stringYouWantToReplaceQuestionMark);
stmt.execute();

Android SQL query（）不会替换问号

1 个答案: