T-SQL解析json字符串函数及其使用示例
参考博文：http://www.cnblogs.com/huangtailang/p/4277809.html
1、解析json字符串函数，返回表变量
ALTER 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*/
) AS BEGIN 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) collate SQL_Latin1_General_CP850_Bin); 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 collate SQL_Latin1_General_CP850_Bin) 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 collate SQL_Latin1_General_CP850_Bin)--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+' ' collate SQL_Latin1_General_CP850_Bin) +1 SELECT @start=PATINDEX('%[^A-Za-z0-9@+.e][A-Za-z0-9@+.e]%', ' '+@contents collate SQL_Latin1_General_CP850_Bin) --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 END INSERT INTO @hierarchy (NAME, SequenceNo, parent_ID, StringValue, Object_ID, ValueType) SELECT '-',1, NULL, '', @parent_id-1, @type -- RETURN END
2、存储过程调用示例
ALTER PROCEDURE [dbo].[P_CallparseJSONTest]
(
@sSenJsonInfo nvarchar(MAX) --json字符串
,@nBackInfo INT OUTPUT --存储过程标识, 1-成功;-1-失败
)
AS
BEGIN DECLARE @parent_ID INT DECLARE @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*/
) BEGIN TRAN BEGIN try
IF @sSenJsonInfo!=''
BEGIN
INSERT INTO @hierarchy(sequenceNo,parent_ID,Object_ID,NAME,StringValue,ValueType)
SELECT sequenceNo,parent_ID,Object_ID,NAME,StringValue,ValueType FROM dbo.parseJSON(@sSenJsonInfo)
IF @@error<>0
BEGIN
ROLLBACK TRAN
RETURN 0
END
END
ELSE
BEGIN
SET @nBackInfo = 0
RETURN
END
SET @nBackInfo = 1 --成功
END try BEGIN catch
SET @nBackInfo = -1 --失败
END catch IF @@error<>0
BEGIN
ROLLBACK TRAN
RETURN 0
END
ELSE
BEGIN
COMMIT TRAN
RETURN 1
END
END
......