json array to table - sql

Question

I am using SQL Server 2014. I can't use openjson to read the following array and convert it to table structure. My array looks like below. It can have more than 2 objects. I have a few other column as well in the table (tableA) along with array column:
[{"Id":1725,"Number":"12345","qty":1,"Block":true},
{"Id":125,"Number":"1234544","qty":1,"Block":true}]
Created function below.
but it returns blank when I run it for my table as-
SELECT
dbo.fn_parse_json2xml(X.jsoncolumn) AS XML_Column
FROM
tableA AS X;
I could not get it to working.I apologize in advance if I missed something.
CREATE FUNCTION dbo.fn_parse_json2xml(
#json varchar(max)
)
RETURNS xml
AS
BEGIN;
DECLARE #output varchar(max), #key varchar(max), #value varchar(max),
#recursion_counter int, #offset int, #nested bit, #array bit,
#tab char(1)=CHAR(9), #cr char(1)=CHAR(13), #lf char(1)=CHAR(10);
--- Clean up the JSON syntax by removing line breaks and tabs and
--- trimming the results of leading and trailing spaces:
SET #json=LTRIM(RTRIM(
REPLACE(REPLACE(REPLACE(#json, #cr, ''), #lf, ''), #tab, '')));
--- Sanity check: If this is not valid JSON syntax, exit here.
IF (LEFT(#json, 1)!='{' OR RIGHT(#json, 1)!='}')
RETURN '';
--- Because the first and last characters will, by definition, be
--- curly brackets, we can remove them here, and trim the result.
SET #json=LTRIM(RTRIM(SUBSTRING(#json, 2, LEN(#json)-2)));
SELECT #output='';
WHILE (#json!='') BEGIN;
--- Look for the first key which should start with a quote.
IF (LEFT(#json, 1)!='"')
RETURN 'Expected quote (start of key name). Found "'+
LEFT(#json, 1)+'"';
--- .. and end with the next quote (that isn't escaped with
--- and backslash).
SET #key=SUBSTRING(#json, 2,
PATINDEX('%[^\\]"%', SUBSTRING(#json, 2, LEN(#json))+' "'));
--- Truncate #json with the length of the key.
SET #json=LTRIM(SUBSTRING(#json, LEN(#key)+3, LEN(#json)));
--- The next character should be a colon.
IF (LEFT(#json, 1)!=':')
RETURN 'Expected ":" after key name, found "'+
LEFT(#json, 1)+'"!';
--- Truncate #json to skip past the colon:
SET #json=LTRIM(SUBSTRING(#json, 2, LEN(#json)));
--- If the next character is an angle bracket, this is an array.
IF (LEFT(#json, 1)='[')
SELECT #array=1, #json=LTRIM(SUBSTRING(#json, 2, LEN(#json)));
IF (#array IS NULL) SET #array=0;
WHILE (#array IS NOT NULL) BEGIN;
SELECT #value=NULL, #nested=0;
--- The first character of the remainder of #json indicates
--- what type of value this is.
--- Set #value, depending on what type of value we're looking at:
---
--- 1. A new JSON object:
--- To be sent recursively back into the parser:
IF (#value IS NULL AND LEFT(#json, 1)='{') BEGIN;
SELECT #recursion_counter=1, #offset=1;
WHILE (#recursion_counter!=0 AND #offset<LEN(#json)) BEGIN;
SET #offset=#offset+
PATINDEX('%[{}]%', SUBSTRING(#json, #offset+1,
LEN(#json)));
SET #recursion_counter=#recursion_counter+
(CASE SUBSTRING(#json, #offset, 1)
WHEN '{' THEN 1
WHEN '}' THEN -1 END);
END;
SET #value=CAST(
dbo.fn_parse_json2xml(LEFT(#json, #offset))
AS varchar(max));
SET #json=SUBSTRING(#json, #offset+1, LEN(#json));
SET #nested=1;
END
--- 2a. Blank text (quoted)
IF (#value IS NULL AND LEFT(#json, 2)='""')
SELECT #value='', #json=LTRIM(SUBSTRING(#json, 3,
LEN(#json)));
--- 2b. Other text (quoted, but not blank)
IF (#value IS NULL AND LEFT(#json, 1)='"') BEGIN;
SET #value=SUBSTRING(#json, 2,
PATINDEX('%[^\\]"%',
SUBSTRING(#json, 2, LEN(#json))+' "'));
SET #json=LTRIM(
SUBSTRING(#json, LEN(#value)+3, LEN(#json)));
END;
--- 3. Blank (not quoted)
IF (#value IS NULL AND LEFT(#json, 1)=',')
SET #value='';
--- 4. Or unescaped numbers or text.
IF (#value IS NULL) BEGIN;
SET #value=LEFT(#json,
PATINDEX('%[,}]%', REPLACE(#json, ']', '}')+'}')-1);
SET #json=SUBSTRING(#json, LEN(#value)+1, LEN(#json));
END;
--- Append #key and #value to #output:
SET #output=#output+#lf+#cr+
REPLICATE(#tab, ##NESTLEVEL-1)+
'<'+#key+'>'+
ISNULL(REPLACE(
REPLACE(#value, '\"', '"'), '\\', '\'), '')+
(CASE WHEN #nested=1
THEN #lf+#cr+REPLICATE(#tab, ##NESTLEVEL-1)
ELSE ''
END)+
'</'+#key+'>';
--- And again, error checks:
---
--- 1. If these are multiple values, the next character
--- should be a comma:
IF (#array=0 AND #json!='' AND LEFT(#json, 1)!=',')
RETURN #output+'Expected "," after value, found "'+
LEFT(#json, 1)+'"!';
--- 2. .. or, if this is an array, the next character
--- should be a comma or a closing angle bracket:
IF (#array=1 AND LEFT(#json, 1) NOT IN (',', ']'))
RETURN #output+'In array, expected "]" or "," after '+
'value, found "'+LEFT(#json, 1)+'"!';
--- If this is where the array is closed (i.e. if it's a
--- closing angle bracket)..
IF (#array=1 AND LEFT(#json, 1)=']') BEGIN;
SET #array=NULL;
SET #json=LTRIM(SUBSTRING(#json, 2, LEN(#json)));
--- After a closed array, there should be a comma:
IF (LEFT(#json, 1) NOT IN ('', ',')) BEGIN
RETURN 'Closed array, expected ","!';
END;
END;
SET #json=LTRIM(SUBSTRING(#json, 2, LEN(#json)+1));
IF (#array=0) SET #array=NULL;
END;
END;
--- Return the output:
RETURN CAST(#output AS xml);
END;
DECLARE #json varchar(max);
SET #json='{
"Person": {
"firstName": "John",
"lastName": "Smith",
"age": [25, 26, 27],
"Address": {
"streetAddress":"21, 2nd Street",
"city" :"New York",
"state":"NY",
"postalCode":"10021"
},
"PhoneNumbers": {
"home":"212 555-1234",
"fax":"646 555-4567"
}
}
}';
SELECT dbo.fn_parse_json2xml(#json);

Answer 1

That answer is really late, probably to late for you, but it might help someone else:
Assuming the structure is always the same you can transform your string to an XML rather easily:
DECLARE #jsonString NVARCHAR(MAX)=
N'[{"Id":1725,"Number":"12345","qty":1,"Block":true},
{"Id":125,"Number":"1234544","qty":1,"Block":true}]';
DECLARE #Converted XML=
CAST(REPLACE
(REPLACE
(REPLACE
(REPLACE
(REPLACE
(REPLACE
(REPLACE
(#jsonString,'[','')
,'{"Id":','<row><Id>')
,',"Number":','</Id><Number>')
,',"qty":','</Number><qty>')
,',"Block":','</qty><Block>')
,'},','</Block></row>')
,'}]','</Block></row>') AS XML);
--See the result
SELECT #Converted;
<row>
<Id>1725</Id>
<Number>"12345"</Number>
<qty>1</qty>
<Block>true</Block>
</row>
<row>
<Id>125</Id>
<Number>"1234544"</Number>
<qty>1</qty>
<Block>true</Block>
</row>
--This XML can be queries like here:
SELECT a.value('(Id/text())[1]','int') AS Id
,a.value('(Number/text())[1]','nvarchar(max)') AS Number
,a.value('(qty/text())[1]','int') AS qty
,a.value('(Block/text())[1]','bit') AS Block
FROM #Converted.nodes('/row') A(a);
The final result
Id Number qty Block
1725 "12345" 1 1
125 "1234544" 1 1