SQL Server 2008 parseJSON函数将JSON解析成Table

CREATE FUNCTION [dbo].[parseJSON]( @JSON NVARCHAR(MAX))RETURNS @hierarchy TABLE  (   element_id INT IDENTITY(1, 1) NOT NULL, /* internal surrogate primary key gives the order of parsing and the list order */   sequenceNo [int] NULL, /* the place in the sequence for the element */   parent_ID INT,/* if the element has a parent then it is in this column. The document is the ultimate parent, so you can get the structure from recursing from the document */   Object_ID INT,/* each list or object has an object id. This ties all elements to a parent. Lists are treated as objects here */   NAME NVARCHAR(2000),/* the name of the object */   StringValue NVARCHAR(MAX) NOT NULL,/*the string representation of the value of the element. */   ValueType VARCHAR(10) NOT null /* the declared type of the value represented as a string in StringValue*/  )ASBEGIN  DECLARE    @FirstObject INT, --the index of the first open bracket found in the JSON string    @OpenDelimiter INT,--the index of the next open bracket found in the JSON string    @NextOpenDelimiter INT,--the index of subsequent open bracket found in the JSON string    @NextCloseDelimiter INT,--the index of subsequent close bracket found in the JSON string    @Type NVARCHAR(10),--whether it denotes an object or an array    @NextCloseDelimiterChar CHAR(1),--either a '}' or a ']'    @Contents NVARCHAR(MAX), --the unparsed contents of the bracketed expression    @Start INT, --index of the start of the token that you are parsing    @end INT,--index of the end of the token that you are parsing    @param INT,--the parameter at the end of the next Object/Array token    @EndOfName INT,--the index of the start of the parameter at end of Object/Array token    @token NVARCHAR(200),--either a string or object    @value NVARCHAR(MAX), -- the value as a string    @SequenceNo int, -- the sequence number within a list    @name NVARCHAR(200), --the name as a string    @parent_ID INT,--the next parent ID to allocate    @lenJSON INT,--the current length of the JSON String    @characters NCHAR(36),--used to convert hex to decimal    @result BIGINT,--the value of the hex symbol being parsed    @index SMALLINT,--used for parsing the hex value    @Escape INT --the index of the next escape character      DECLARE @Strings TABLE /* in this temporary table we keep all strings, even the names of the elements, since they are 'escaped' in a different way, and may contain, unescaped, brackets denoting objects or lists. These are replaced in the JSON string by tokens representing the string */    (     String_ID INT IDENTITY(1, 1),     StringValue NVARCHAR(MAX)    )  SELECT--initialise the characters to convert hex to ascii    @characters='0123456789abcdefghijklmnopqrstuvwxyz',    @SequenceNo=0, --set the sequence no. to something sensible.  /* firstly we process all strings. This is done because [{} and ] aren't escaped in strings, which complicates an iterative parse. */    @parent_ID=0;  WHILE 1=1 --forever until there is nothing more to do    BEGIN      SELECT        @start=PATINDEX('%[^a-zA-Z]["]%', @json collate SQL_Latin1_General_CP850_Bin);--next delimited string      IF @start=0 BREAK --no more so drop through the WHILE loop      IF SUBSTRING(@json, @start+1, 1)='"'        BEGIN --Delimited Name          SET @start=@Start+1;          SET @end=PATINDEX('%[^\]["]%', RIGHT(@json, LEN(@json+'|')-@start));        END      IF @end=0 --no end delimiter to last string        BREAK --no more      SELECT @token=SUBSTRING(@json, @start+1, @end-1)      --now put in the escaped control characters      SELECT @token=REPLACE(@token, FROMString, TOString)      FROM        (SELECT          '\"' AS FromString, '"' AS ToString         UNION ALL SELECT '\\', '\'         UNION ALL SELECT '\/', '/'         UNION ALL SELECT '\b', CHAR(08)         UNION ALL SELECT '\f', CHAR(12)         UNION ALL SELECT '\n', CHAR(10)         UNION ALL SELECT '\r', CHAR(13)         UNION ALL SELECT '\t', CHAR(09)        ) substitutions      SELECT @result=0, @escape=1  --Begin to take out any hex escape codes      WHILE @escape>0        BEGIN          SELECT @index=0,          --find the next hex escape sequence          @escape=PATINDEX('%\x[0-9a-f][0-9a-f][0-9a-f][0-9a-f]%', @token)          IF @escape>0 --if there is one            BEGIN              WHILE @index<4 --there are always four digits to a \x sequence                  BEGIN                  SELECT --determine its value                    @result=@result+POWER(16, @index)                    *(CHARINDEX(SUBSTRING(@token, @escape+2+3-@index, 1),                                @characters)-1), @index=@index+1 ;                        END                -- and replace the hex sequence by its unicode value              SELECT @token=STUFF(@token, @escape, 6, NCHAR(@result))            END        END      --now store the string away      INSERT INTO @Strings (StringValue) SELECT @token      -- and replace the string with a token      SELECT @JSON=STUFF(@json, @start, @end+1,                    '@string'+CONVERT(NVARCHAR(5), @@identity))    END  -- all strings are now removed. Now we find the first leaf.   WHILE 1=1  --forever until there is nothing more to do  BEGIN   SELECT @parent_ID=@parent_ID+1  --find the first object or list by looking for the open bracket  SELECT @FirstObject=PATINDEX('%[{[[]%', @json collate SQL_Latin1_General_CP850_Bin)--object or array  IF @FirstObject = 0 BREAK  IF (SUBSTRING(@json, @FirstObject, 1)='{')    SELECT @NextCloseDelimiterChar='}', @type='object'  ELSE    SELECT @NextCloseDelimiterChar=']', @type='array'  SELECT @OpenDelimiter=@firstObject   WHILE 1=1 --find the innermost object or list...    BEGIN      SELECT        @lenJSON=LEN(@JSON+'|')-1  --find the matching close-delimiter proceeding after the open-delimiter      SELECT        @NextCloseDelimiter=CHARINDEX(@NextCloseDelimiterChar, @json,                                      @OpenDelimiter+1)  --is there an intervening open-delimiter of either type      SELECT @NextOpenDelimiter=PATINDEX('%[{[[]%',             RIGHT(@json, @lenJSON-@OpenDelimiter)collate SQL_Latin1_General_CP850_Bin)--object      IF @NextOpenDelimiter=0        BREAK      SELECT @NextOpenDelimiter=@NextOpenDelimiter+@OpenDelimiter      IF @NextCloseDelimiter<@NextOpenDelimiter        BREAK      IF SUBSTRING(@json, @NextOpenDelimiter, 1)='{'        SELECT @NextCloseDelimiterChar='}', @type='object'      ELSE        SELECT @NextCloseDelimiterChar=']', @type='array'      SELECT @OpenDelimiter=@NextOpenDelimiter    END  ---and parse out the list or name/value pairs  SELECT    @contents=SUBSTRING(@json, @OpenDelimiter+1,                        @NextCloseDelimiter-@OpenDelimiter-1)  SELECT    @JSON=STUFF(@json, @OpenDelimiter,                @NextCloseDelimiter-@OpenDelimiter+1,                '@'+@type+CONVERT(NVARCHAR(5), @parent_ID))  WHILE (PATINDEX('%[A-Za-z0-9@+.e]%', @contents collate SQL_Latin1_General_CP850_Bin))<>0    BEGIN      IF @Type='Object' --it will be a 0-n list containing a string followed by a string, number,boolean, or null        BEGIN          SELECT            @SequenceNo=0,@end=CHARINDEX(':', ' '+@contents)--if there is anything, it will be a string-based name.          SELECT  @start=PATINDEX('%[^A-Za-z@][@]%', ' '+@contents)--AAAAAAAA          SELECT @token=SUBSTRING(' '+@contents, @start+1, @End-@Start-1),            @endofname=PATINDEX('%[0-9]%', @token collate SQL_Latin1_General_CP850_Bin),            @param=RIGHT(@token, LEN(@token)-@endofname+1)          SELECT            @token=LEFT(@token, @endofname-1),            @Contents=RIGHT(' '+@contents, LEN(' '+@contents+'|')-@end-1)          SELECT  @name=stringvalue FROM @strings            WHERE string_id=@param --fetch the name        END      ELSE        SELECT @Name=null,@SequenceNo=@SequenceNo+1      SELECT        @end=CHARINDEX(',', @contents)-- a string-token, object-token, list-token, number,boolean, or null      IF @end=0        SELECT  @end=PATINDEX('%[A-Za-z0-9@+.e][^A-Za-z0-9@+.e]%', @Contents+' ')          +1       SELECT        @start=PATINDEX('%[^A-Za-z0-9@+.e][A-Za-z0-9@+.e]%', ' '+@contents)      --select @start,@end, LEN(@contents+'|'), @contents       SELECT        @Value=RTRIM(SUBSTRING(@contents, @start, @End-@Start)),        @Contents=RIGHT(@contents+' ', LEN(@contents+'|')-@end)      IF SUBSTRING(@value, 1, 7)='@object'        INSERT INTO @hierarchy          (NAME, SequenceNo, parent_ID, StringValue, Object_ID, ValueType)          SELECT @name, @SequenceNo, @parent_ID, SUBSTRING(@value, 8, 5),            SUBSTRING(@value, 8, 5), 'object'      ELSE        IF SUBSTRING(@value, 1, 6)='@array'          INSERT INTO @hierarchy            (NAME, SequenceNo, parent_ID, StringValue, Object_ID, ValueType)            SELECT @name, @SequenceNo, @parent_ID, SUBSTRING(@value, 7, 5),              SUBSTRING(@value, 7, 5), 'array'        ELSE          IF SUBSTRING(@value, 1, 7)='@string'            INSERT INTO @hierarchy              (NAME, SequenceNo, parent_ID, StringValue, ValueType)              SELECT @name, @SequenceNo, @parent_ID, stringvalue, 'string'              FROM @strings              WHERE string_id=SUBSTRING(@value, 8, 5)          ELSE            IF @value IN ('true', 'false')              INSERT INTO @hierarchy                (NAME, SequenceNo, parent_ID, StringValue, ValueType)                SELECT @name, @SequenceNo, @parent_ID, @value, 'boolean'            ELSE              IF @value='null'                INSERT INTO @hierarchy                  (NAME, SequenceNo, parent_ID, StringValue, ValueType)                  SELECT @name, @SequenceNo, @parent_ID, @value, 'null'              ELSE                IF PATINDEX('%[^0-9]%', @value collate SQL_Latin1_General_CP850_Bin)>0                  INSERT INTO @hierarchy                    (NAME, SequenceNo, parent_ID, StringValue, ValueType)                    SELECT @name, @SequenceNo, @parent_ID, @value, 'real'                ELSE                  INSERT INTO @hierarchy                    (NAME, SequenceNo, parent_ID, StringValue, ValueType)                    SELECT @name, @SequenceNo, @parent_ID, @value, 'int'      if @Contents=' ' Select @SequenceNo=0    END  ENDINSERT INTO @hierarchy (NAME, SequenceNo, parent_ID, StringValue, Object_ID, ValueType)  SELECT '-',1, NULL, '', @parent_id-1, @type--   RETURNEND