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Re: [問題] 資料存取的問題

[ java ]8 留言, 推噓總分: +5

作者: eieio - 發表於 2016/07/19 10:48(9年前)

1^F推gw10313: 這個跟我想要的方式很像! 感謝你我試試看07/19 17:14

3^F推gw10313: 嗯嗯非常感謝我後來用 multimap完成的我想要的功能07/24 23:55

4^F→gw10313: 真的就把資料一次讀出來然後放入記憶體內了07/24 23:56

5^F推gw10313: 30萬筆資料比我想像的還少一點記憶體還夠XD07/25 00:02

[問題] 資料存取的問題

[ java ]10 留言, 推噓總分: +2

作者: gw10313 - 發表於 2016/07/18 18:32(9年前)

3^F→gw10313: 如果可以的話不用SQL也沒關係07/18 19:04

4^F→gw10313: 只是還是需要有類似SQL的抓取資料的方法就可以07/18 19:05

5^F→gw10313: 目前我都是在用資料去比對A欄位的值然後抓B跟C07/18 19:05

7^F→gw10313: 不限SQL 只要能抓出資料就可以07/18 19:14

9^F→gw10313: 請問是什麼意思我不太懂囧07/18 21:06

11^F→gw10313: 我是不太懂怎麼用MAP做沒有一個想法要怎麼把這東西07/18 21:20

12^F→gw10313: 轉換成我要的東西07/18 21:20

14^F→gw10313: 我知道MAP 只是沒有一個想法要怎麼去用再我要的東西上面07/18 21:45

15^F→gw10313: 我先來看看好了07/18 21:46

19^F→gw10313: 目前是三十萬筆資料左右感覺應該夠(?)07/18 23:40

20^F→gw10313: 因為我目前程式都寫好了主要是太多一筆一筆SQL的呼叫07/18 23:42

21^F→gw10313: 所以造成程式效率低落想要找其他方法加速程式效率07/18 23:43

22^F→gw10313: HSQLDB 我也會去看看希望能找到方法解決07/18 23:43

33^F→gw10313: 我有對columnA做index 還是覺得很慢QQ07/19 08:49

[問題] 為什麼學JAVA

[ java ]38 留言, 推噓總分: +34

作者: tiyun - 發表於 2009/03/14 21:38(17年前)

10^F推gw10313:我覺得學過C都是小黑窗之後發現JAVA有視窗挺有趣的...03/15 01:18

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