Android的 - 崩溃时，我在数据库和选择数据撇号 [英] Android - Crash when i have apostrophe in database and select data

问题描述

我从我SQLite数据库选择数据。我的问题是，当数据库中有撇号（我是约翰 - 例如）。我尽量选择数据，那么我的应用程序崩溃。

I select data from my sqlite database. My problem is that when in database are apostrophes ("I' m John" - for example) and i try to select data, then my application crash.

如果我不拥有数据库撇号，然后万事大吉。

If i don' t have apostrophes in database, then everything is all right.

我的选择数据功能：

String query = "SELECT * FROM " + mainCollumn  + " WHERE used=0 " + " AND season <= " + seasons + " ORDER BY RANDOM() LIMIT " + count ;

    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(query, null);

    if(cursor.moveToFirst()){
        do {
            Question question = new Question(Integer.parseInt(cursor.getString(0)),
                    cursor.getString(1),cursor.getString(2),cursor.getString(3),cursor.getString(4),cursor.getString(5),
                    Integer.parseInt(cursor.getString(6)));

            questionList.add(question);
        }while(cursor.moveToNext());
    }

感谢您的帮助。

推荐答案

您可以通过特殊的双引号替换它们处理撇号，但最好的方法是使用<一个href=\"http://developer.android.com/reference/android/database/sqlite/SQLiteDatabase.html#query%28java.lang.String,%20java.lang.String%5B%5D,%20java.lang.String,%20java.lang.String%5B%5D,%20java.lang.String,%20java.lang.String,%20java.lang.String%29\"><$c$c>query()与 selectionArgs两个而不是 rawQuery（）。

You can specially handle apostrophes by replacing them with double apostrophes, but the best way is to use query() with selectionArgs instead of rawQuery().

SQLiteDatabase db = this.getReadableDatabase();
String[] columns = new String[] {column1, column2}; // the columns you want
Cursor cursor = db.query(mainCollumn, String[] columns, "used=0 and season<=?", new String[] {seasons}, null, null, "RANDOM() LIMIT " + count);

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