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| silvester |
 Posted: Fri Mar 26, 2010 12:01 am |
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Joined: 07 Jan 2009
Posts: 5
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hi,
suppose I have 5 records in a ets/mnesia table,
the table is sorted by key (doesn't matter which key and order).
how I fetch record number 3 from top?
thanks in advance
Silvester |
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| silvester |
| Posted: Fri Mar 26, 2010 11:04 pm |
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Joined: 07 Jan 2009
Posts: 5
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0. record for example is: {table,{Val,Key},Index=undefined}
1. key can be used as a tuple, so my key is the tuple: {Val,Key}
2. the table is ordered set, so the Val's are sorted.
3. a foldl/3 runs all over the table and update the index accordingly.
4. assume we index_read the index column, we can fetch it with one access.
foldl/3 is time consuming, but its OK to me as I do it offline once in a while. |
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| wuji |
| Posted: Sat Aug 11, 2012 1:29 am |
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Joined: 10 Aug 2012
Posts: 654
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