I would like to output the results of a SELECT statement as a JSON object.
I would like this to be a Function and not a stored procedure!
For example, the below table Users
id name active
1 Bob Jones 1
2 John Smith 0
Would be returned like this:
[{"id":1,"name":"Bob Jones","active":1},{"id":2,"name":"John Smith","active":0}]
Thanks in advance.
Starting from SQL Server 2016 you can use for json:
declare @t table(id int, name nvarchar(max), active bit)
insert @t values (1, 'Bob Jones', 1), (2, 'John Smith', 0)
select id, name, active
from @t
for json auto
With older versions of SQL Server you can use for xml path, e.g.:
select '[' + STUFF((
select
',{"id":' + cast(id as varchar(max))
+ ',"name":"' + name + '"'
+ ',"active":' + cast(active as varchar(max))
+'}'
from @t t1
for xml path(''), type
).value('.', 'varchar(max)'), 1, 1, '') + ']'
Output:
[{"id":1,"name":"Bob Jones","active":1},{"id":2,"name":"John Smith","active":0}]
for json then you don't need to escape, if you use that hacky way with for xml then you need to escape –
Rammish Just for improving answer with latest technology change. with sql server 2016
select id, name ,active
from tableName
FOR JSON AUTO
So first off, I want to thank Kirill Polishchuk for the essential code sample ... thank you!
I took that and went to build a procedure to do what I need it to do, and that is to give me a JSON output based on "any" result set I want i.e. table object (not variable) in SQL Server.
Ideally, I would want this as a function, however due to limitations on what you can do within a function, that part will have to wait ... maybe v2. :)
And yes, registering an extended procedure (CLR) definitely be easier, but I wanted to avoid going that route for the time being.
PS: for temp tables, just put in 'tempdb..#tablename'
Here it is:
/*
Author: Goran Biljetina
Create date: 03/13/2013
Description: consume a table object (not table var), output it as JSON Properties string
*/
/*
--> example run
-- EXEC dbo.JSONreturn @tblObjNameFQ='[database].[schema].[object_name_table]';
*/
CREATE PROCEDURE dbo.JSONreturn
(
@committedRead bit = 0 --> if 1 then committed else uncommitted read
,@debugmode bit = 0 --> if 1 display certain outputs
,@tblObjNameFQ varchar(128) --> fully qualified table object name, i.e. db.schema.object_name
,@stringJSON nvarchar(max) = null OUTPUT
)
AS
BEGIN
if @committedRead=0
begin
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED; --> evaluate if necessary in test phase
end
else if @committedRead=1
begin
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
end
SET NOCOUNT ON;
----------------------------------------------------------------------------------------------------------
if (PATINDEX('%[\.]%',@tblObjNameFQ)<1 AND patindex('%#%',@tblObjNameFQ)<1) OR LEN(@tblObjNameFQ)>(3*128)
begin
PRINT 'table (object) name not fully qualified or invalid!'
RETURN -1
end
declare
@objname varchar(128)
,@dbname varchar(128)
,@schema varchar(128)
,@maxColNum int
,@inc int
,@dqsl_misc varchar(max)
,@dsql_wrapper varchar(max)
,@dsql_what varchar(max)
,@dsql_where varchar(max)
,@dsql_complete varchar(max)
create table #maxColNum (column_id int)
create table #ColPrep (colString varchar(max), column_id int)
create table #JSONoutput (string nvarchar(max))
if patindex('%#%',@tblObjNameFQ)>0
begin
set @objname = (PARSENAME(@tblObjNameFQ,1))
set @dbname = 'tempdb'
end
else if patindex('%#%',@tblObjNameFQ)<1
begin
set @dbname = SUBSTRING(@tblObjNameFQ,1,PATINDEX('%[\.]%',@tblObjNameFQ)-1)
set @objname = convert(varchar,(PARSENAME(@tblObjNameFQ,1)))
set @schema = convert(varchar,(PARSENAME(@tblObjNameFQ,2)))
end
--select @objname[@objname], @dbname[@dbname], @schema[@schema]
--select @dbname+'.'+@schema+'.'+@objname
set @dqsl_misc =
'
select max(column_id)
from '+@dbname+'.sys.columns
where object_id =
(select object_id from '+@dbname+'.sys.objects where type = ''U'' and name like ''%'+@objname+'%'')
'
insert into #maxColNum
exec(@dqsl_misc)
set @maxColNum = (select column_id from #maxColNum)
set @dsql_what = ''
set @dsql_wrapper =
'
select ''['' + STUFF((
select
'',{''+<<REPLACE>>
+''}''
'
set @dsql_where =
'
from '+@dbname+'.'+case when @schema is null then '' else @schema end+'.'+@objname+' t1
for xml path(''''), type
).value(''.'', ''varchar(max)''), 1, 1, '''') + '']''
'
set @dqsl_misc =
'
select ''"''+sysc.name+''": ''
+case
when syst.name like ''%time%'' or syst.collationid is not null then ''"''''+cast(''+sysc.name+'' as varchar(max))+''''",''
when syst.name = ''bit'' then ''''''+cast((case when ''+sysc.name+''=1 then ''''true'''' else ''''false'''' end) as varchar(max))+'''',''
else ''''''+cast(''+sysc.name+'' as varchar(max))+'''',''
end as colString, sysc.column_id
from '+@dbname+'.sys.columns sysc
join '+@dbname+'.sys.systypes syst
on sysc.system_type_id = syst.xtype and syst.xtype <> 240 and syst.name <> ''sysname''
where object_id = (select object_id from '+@dbname+'.sys.objects where type = ''U'' and name like ''%'+@objname+'%'')
order by sysc.column_id
'
insert into #ColPrep
exec(@dqsl_misc)
set @inc = (select MIN(column_id) from #ColPrep)
while @inc<=@maxColNum
begin
set @dsql_what = @dsql_what+(select case
when @inc = @maxColNum then replace(colString,',','')
else colString end
from #ColPrep where column_id = @inc)
set @inc=@inc+1
IF @inc>@maxColNum
set @dsql_what = ''''+@dsql_what+''''
IF @inc>@maxColNum
BREAK
ELSE
CONTINUE
end
set @dsql_complete = REPLACE(@dsql_wrapper,'<<REPLACE>>',@dsql_what)+@dsql_where
insert into #JSONoutput
exec(@dsql_complete)
SET @stringJSON = (Select string from #JSONoutput)
----------------------------------------------------------------------------------------------------------
END
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