SQL Server SELECT到JSON函数

Question

我想输出SELECT语句的结果作为JSON对象。

我想这是一个函数而不是一个存储过程！提前

[{"id":1,"name":"Bob Jones","active":1},{"id":2,"name":"John Smith","active":0}] 

感谢：

例如，下面的表用户

id name  active 
1  Bob Jones 1 
2  John Smith 0 

将返回这个样子。

Answer 1

您可以使用for xml path，例如：

declare @t table(id int, name nvarchar(max), active bit) 
insert @t values (1, 'Bob Jones', 1), (2, 'John Smith', 0) 

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, '') + ']' 

输出：

[{"id":1,"name":"Bob Jones","active":1},{"id":2,"name":"John Smith","active":0}] 

Answer 2

所以首先，我要感谢基里尔舒克的基本代码示例...谢谢！

我拿了那个，去建立一个程序来做我需要它做的事情，那就是给我一个基于“任何”结果集的JSON输出，我希望在SQL Server中的表对象（不可变） 。

理想情况下，我希望这是一个函数，但由于限制你可以在一个函数内做什么，该部分将不得不等待......也许是v2。 :)

是的，注册一个扩展过程（CLR）肯定会更容易，但我想避免去那条路线暂时。

PS：对于临时表，只是把 'tempdb中..＃表名'

这就是：

  /* 
      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 

Answer 3

只是为了改善与最新的技术变革的答案。与SQL服务器2016

select id, name ,active 
    from tableName 
     FOR JSON AUTO