Re: [h2] MVMap similar to LinkedHashMap

[ivan]

but that taking up more memory... 

On Monday, April 23, 2018 at 2:07:42 PM UTC+8, Thomas Mueller Graf wrote:
>
> Hi,
>
> What about adding a second map with a counter as a key, and the key as the 
> value. So there are two maps:
>
> map 1: key: counter; value: your key
> map 2: key: your key; value: your value plus the counter from map 1
>
> Regards,
> Thomas
>
>
> On Sun, Apr 22, 2018 at 8:46 PM, ivan  > wrote:
>
>> oh? that great! do you have any sample?  Thanks
>>
>> I found this but can't really understand how this work :
>>
>> MVRTreeMap r = s.openMap("data",
>> new MVRTreeMap.Builder());
>>
>> // add two key-value pairs
>> // the first value is the key id (to make the key unique)
>> // then the min x, max x, min y, max y
>> r.add(new SpatialKey(0, -3f, -2f, 2f, 3f), "left");
>> r.add(new SpatialKey(1, 3f, 4f, 4f, 5f), "right");
>>
>> // iterate over the intersecting keys
>> Iterator it =
>> r.findIntersectingKeys(new SpatialKey(0, 0f, 9f, 3f, 6f));
>> for (SpatialKey k; it.hasNext();) {
>> k = it.next();
>> System.out.println(k + ": " + r.get(k));
>> }
>> s.close();
>>
>> On Saturday, April 21, 2018 at 7:34:10 PM UTC+8, Noel Grandin wrote:
>>>
>>> you can use ceiingKey(K) to match on the first part of the search key.​
>>>
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>>
>
>

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Re: [h2] MVMap similar to LinkedHashMap

[Thomas Mueller Graf]

Hi,

What about adding a second map with a counter as a key, and the key as the
value. So there are two maps:

map 1: key: counter; value: your key
map 2: key: your key; value: your value plus the counter from map 1

Regards,
Thomas


On Sun, Apr 22, 2018 at 8:46 PM, ivan  wrote:

> oh? that great! do you have any sample?  Thanks
>
> I found this but can't really understand how this work :
>
> MVRTreeMap r = s.openMap("data",
> new MVRTreeMap.Builder());
>
> // add two key-value pairs
> // the first value is the key id (to make the key unique)
> // then the min x, max x, min y, max y
> r.add(new SpatialKey(0, -3f, -2f, 2f, 3f), "left");
> r.add(new SpatialKey(1, 3f, 4f, 4f, 5f), "right");
>
> // iterate over the intersecting keys
> Iterator it =
> r.findIntersectingKeys(new SpatialKey(0, 0f, 9f, 3f, 6f));
> for (SpatialKey k; it.hasNext();) {
> k = it.next();
> System.out.println(k + ": " + r.get(k));
> }
> s.close();
>
> On Saturday, April 21, 2018 at 7:34:10 PM UTC+8, Noel Grandin wrote:
>>
>> you can use ceiingKey(K) to match on the first part of the search key.​
>>
> --
> You received this message because you are subscribed to the Google Groups
> "H2 Database" group.
> To unsubscribe from this group and stop receiving emails from it, send an
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> Visit this group at https://groups.google.com/group/h2-database.
> For more options, visit https://groups.google.com/d/optout.
>

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Re: [h2] MVMap similar to LinkedHashMap

[ivan]

oh? that great! do you have any sample?  Thanks

I found this but can't really understand how this work :

MVRTreeMap r = s.openMap("data",
new MVRTreeMap.Builder());

// add two key-value pairs
// the first value is the key id (to make the key unique)
// then the min x, max x, min y, max y
r.add(new SpatialKey(0, -3f, -2f, 2f, 3f), "left");
r.add(new SpatialKey(1, 3f, 4f, 4f, 5f), "right");

// iterate over the intersecting keys
Iterator it =
r.findIntersectingKeys(new SpatialKey(0, 0f, 9f, 3f, 6f));
for (SpatialKey k; it.hasNext();) {
k = it.next();
System.out.println(k + ": " + r.get(k));
}
s.close();

On Saturday, April 21, 2018 at 7:34:10 PM UTC+8, Noel Grandin wrote:
>
> you can use ceiingKey(K) to match on the first part of the search key.​
>

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Re: [h2] MVMap similar to LinkedHashMap

[Noel Grandin]

you can use ceiingKey(K) to match on the first part of the search key.​

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Re: [h2] MVMap similar to LinkedHashMap

[ivan]

But that will effecte the search key ..

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Re: [h2] MVMap similar to LinkedHashMap

[Noel Grandin]

you could probably get the same effect by adding a sequentially increasing
id to the end of the key​

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Re: [h2] MVMap similar to LinkedHashMap

[Noel Grandin]

No​

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