[postgis-users] How do I handle a ResultSet from a java request?

[Andrew Davis]

I have an open layers map with a simple form that you put info into and it
inserts into my table and then i want to show the data back with the
results on the map via a geojson.

Im working on a "full stack' demonstration of map.. database.. and server..
On Oct 6, 2015 9:02 AM, "Nicolas Ribot" <nicolas.ribot at gmail.com> wrote:

> What kind of client is plugged to your Java code ?
> Does it expect a raw json document to process on its own, or a geographic
> object built in Java ?
>
> Nicolas
>
> On 6 October 2015 at 15:55, Andrew Davis <drsockmonkee at gmail.com> wrote:
>
>> Thanks...
>> I am just starting out on it.  I will be passing only about 40 point
>> features first.
>>
>> I will make note of and go look at the stream... as well..
>>
>> Andy
>> On Oct 6, 2015 8:53 AM, "Nicolas Ribot" <nicolas.ribot at gmail.com> wrote:
>>
>>> Hi Andy,
>>>
>>> Your Java ResultSet contains one big row representing your geoJson
>>> document. You can pass it to the client by building a string from the
>>> resultset:
>>> String geojson = resultSet.getString(1);
>>>
>>> Be careful to the potential big size of the String: if you expect a big
>>> geojson document from the database, it may be wiser to stream it to the
>>> client from the JDBC connection instead of building a Java String.
>>>
>>> Nicolas
>>>
>>> On 6 October 2015 at 15:32, Andrew Davis <drsockmonkee at gmail.com> wrote:
>>>
>>>> Hi all..
>>>>
>>>> I'm sending my first question out so patience please.
>>>>
>>>> I've got a working servlet on my server that will query for and get
>>>> information back from my postgis DB.
>>>>
>>>> Up until now I have been just parsing the results and sending back a
>>>> json string.  I want to get a GeoJSON back from my db now.
>>>>
>>>> I've been working through the information I found here:
>>>>
>>>> http://www.postgresonline.com/journal/archives/267-Creating-GeoJSON-Feature-Collections-with-JSON-and-PostGIS-functions.html
>>>>
>>>> I can create the table with locations included and a geog value, and I
>>>> can run the query below
>>>>
>>>> SELECT row_to_json(fc)
>>>>  FROM ( SELECT 'FeatureCollection' As type, array_to_json(array_agg(f)) As features
>>>>  FROM (SELECT 'Feature' As type
>>>>     , ST_AsGeoJSON(lg.geog)::json As geometry
>>>>     , row_to_json((loc_id, loc_name)) As properties
>>>>    FROM locations As lg   ) As f )  As fc;
>>>>
>>>>
>>>> which brings back a single line string and is in the correct format all in PGAdmin3.
>>>>
>>>>
>>>> I have been trying to duplicate this from my server with java and am stuck at the point where I have
>>>>
>>>> run the query and have a 'thing' (ResultSet) but am unsure as to how to handle it and then pass it
>>>>
>>>> back to the client.
>>>>
>>>>
>>>> Any help would be welcome.
>>>>
>>>>
>>>> Andy..
>>>>
>>>>
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