sql - How to write a query for a nested object that varies on a field of the parent? -

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this may difficult question ask correctly. idea have thing has schema result in json object so:

{ id:1, x:1, y:1, type:"map" settings: {... settings type "map" ...}}

each of fields id, x, y, type directly column in table. want take string of type "map", , in map_settings table properties in properties.

i have instance:

{ id:1, x:1, y:1, type:"graph" settings: {... settings type "map" ...}}

which has different type. , reference graph_settings table instead.

how can write query that?

i'm not sure how sql server produce json, produce similar in xml. perhaps there way convert xml json..

i'm assuming schema this:

create table [thing] (     [id] int,     [x] int,     [y] int,     [type] varchar(10) )  create table [map_settings] (     [thing_id] int,     [mapsetting1] int,     [mapsetting2] int )  create table [graph_settings] (     [thing_id] int,     [graphsetting3] int,     [graphsetting4] int )

some data:

insert [thing] values (1, 1, 1, 'map'), (2, 1, 1, 'graph') insert [map_settings] values (1, 0, 0) insert [graph_settings] values (2, 0, 0)

and query produces xml:

select     thing.id [@id],     thing.[x] [@x],     thing.[y] [@y],     thing.[type] [@type],     case thing.[type]         when 'map'             (                 select [mapsetting1] [@mapsetting1], [mapsetting2] [@mapsetting2]                 [map_settings] ms                 ms.[thing_id] = thing.[id]                 xml path ('settings'), type             )         when 'graph'             (                 select [graphsetting3] [@graphsetting3], [graphsetting4] [@graphsetting4]                 [graph_settings] gs                 gs.[thing_id] = thing.[id]                 xml path ('settings'), type             )     end [thing] thing xml path ('thing')

the output:

<thing id="1" x="1" y="1" type="map">   <settings mapsetting1="0" mapsetting2="0" /> </thing> <thing id="2" x="1" y="1" type="graph">   <settings graphsetting3="0" graphsetting4="0" /> </thing>

does help?


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