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我正在尝试使用 BETWEEN 运算符通过 Android 比较 sqlite 中的纬度和经度值。问题是该值总是被比较，就好像它是一个字符串，我不知道如何将它作为一个数字进行比较。我发现这一点是因为使用查询“select * from database orderby latitude”会返回一个未按数字排序的列表。KEY_LAT 和 KEY_LONG 我存储为 TEXT 和 REAL，并且得到相同的输出。请告诉我您需要什么信息。

这是查询：

         double high_lat = curr_lat + 100.0;
     double high_long = curr_longitude + 100.0;
     double low_lat = curr_lat - 100.0;
     double low_long = curr_longitude - 100.0;
         Cursor cursor = db.query(TABLE_NAME,      new String[]                        {KEY_ID, KEY_NAME, KEY_ADDR, KEY_LAT, KEY_LONG}, select,
        new String[]
                {KEY_LAT + " BETWEEN " + low_lat + " AND " 
                + high_lat + " AND " + KEY_LONG + " BETWEEN " + low_long + " AND " 
                + high_long},
            null, null, null);
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1 回答 1

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将您的输入转换为 REAL 作为最后的手段。

...KEY_LONG + " BETWEEN CAST(" + low_long + " AS REAL) AND CAST(" + high_long +" AS REAL)"

于 2013-04-24T22:12:24.210 回答