json - How to JSON_MODIFY on Array of Array? -


my strucutre this

declare @layout nvarchar(max) = n'     {         "sections": [             {                 "sectionname":"section1",                 "sectionorder":1,                 "renders":[                     {                         "rendername":"render1",                         "renderorder":1,                         "fields":[                             {                                 "fieldname":"field1",                                 "fielddata":"data1"                             },                             {                                 "fieldname":"field2",                                 "fielddata":"data2"                             }                         ]                     },                     {                         "rendername":"render2",                         "renderorder":2,                         "fields":[                             {                                 "fieldname":"field1",                                 "fielddata":"data1"                             },                             {                                 "fieldname":"field2",                                 "fielddata":"data2"                             }                         ]                     }                  ]             },             {                 "sectionname":"section2",                 "sectionorder":2,                 "renders":[                     {                         "rendername":"render1",                         "renderorder":1,                         "fields":[                             {                                 "fieldname":"field1",                                 "fielddata":"data1"                             }                         ]                     },                     {                         "rendername":"render2",                         "renderorder":2,                         "fields":[                             {                                 "fieldname":"field1",                                 "fielddata":"data1"                             },                             {                                 "fieldname":"field2",                                 "fielddata":"data2"                             }                         ]                     }                  ]             }         ]     } '

what do this:

update fielddata = 'dataupdated'  fieldname = 'field2'  , rendername = 'render' , sectionname = 'section1'

how using json_modify?

i can data using following query:  select sectionname, sectionorder, rendername, renderorder, fieldname, fielddata (     select sectionname, sectionorder, rendername, renderorder, fields (         select sectionname, sectionorder, renders         openjson(@layout,'$.sections')          (             sectionname nvarchar(max) '$.sectionname',               sectionorder nvarchar(max) '$.sectionorder',              renders nvarchar(max) '$.renders' json         )     ) sections     cross apply openjson(renders,'$')     (         rendername nvarchar(max) '$.rendername',           renderorder nvarchar(max) '$.renderorder',          fields nvarchar(max) '$.fields' json     ) ) renders cross apply openjson(fields,'$') (     fieldname nvarchar(max) '$.fieldname',       fielddata nvarchar(max) '$.fielddata' )

this not straightforward 1 might hope. surprised there seems no simple way query full path of item in json structure.

json_modify can accept array indicies when targetting member of array, of work here goes generating indexes each nested array member. appears [key] column can generated when using openjson without with clause, couldn't reuse query.

additionally, json_modify accept string literal json path, update has carried out using dynamic sql.

(please note solution assumes want update specific rendername e.g. 'render1' - question unclear on point.)

declare @path nvarchar(2048)  select @path = formatmessage('set @layout = json_modify(@layout, ''$.sections[%s].renders[%s].fields[%s].fielddata'', @newvalue)' ,sectionindex, renderindex, [key]) (     select sectionindex, sectionname, b.[key] renderindex, b.[value] bvalue, json_value([value], '$.rendername') rendername             (select [key] sectionindex, [value] avalue, json_value([value], '$.sectionname') sectionname         openjson(@layout, '$.sections') ) sections         cross apply openjson(sections.avalue, '$.renders') b     ) renders     cross apply openjson(renders.bvalue,'$.fields' ) d json_value([value], '$.fieldname') = 'field2'  , rendername = 'render1' , sectionname = 'section1'  -- execute update; has happen in dynamic sql because json_modify path has literal value, , cannot variable exec sp_executesql @path, n'@layout nvarchar(max) output, @newvalue nvarchar(max)', @layout = @layout output, @newvalue = 'dateupdated'  --check results select sectionindex, sectionname, renderindex, rendername, [key] fieldindex, json_value([value], '$.fieldname') fieldname, json_value([value], '$.fielddata') fieldname (     select sectionindex, sectionname, b.[key] renderindex, b.[value] bvalue, json_value([value], '$.rendername') rendername             (select [key] sectionindex, [value] avalue, json_value([value], '$.sectionname') sectionname         openjson(@layout, '$.sections') ) sections         cross apply openjson(sections.avalue, '$.renders') b     ) renders     cross apply openjson(renders.bvalue,'$.fields' ) d

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