How to parse Json in SQL - sql

Question

I try to parse JSON with the function OPENJSON with a CROSS APLY but I have some problems.
My Json is like this:
[
{
"Communications":[
{
"ID_Communication":null,
"CommunicationType":"HOME",
"CommunicationValue":"0602060206",
"Priority":0,
"Disabled":false
},
{
"ID_Communication":null,
"CommunicationType":"MOBILE",
"CommunicationValue":"0602060306",
"Priority":0,
"Disabled":false
},
{
"ID_Communication":null,
"CommunicationType":"EMAIL",
"CommunicationValue":"MONEMAIL#EMAIL.FR",
"Priority":0,
"Disabled":false
}
],
"InternalId":23126,
"ExternalId":"",
"LastUpdateDate":"2020-01-05T12:04:53",
"Type1":{
"Id":1
},
"Type2":{
"Id":2
},
"Type3":null,
"Title":{
"Id":1
},
"LastName":"TOTO",
"FirstName":"TITI",
"OrganizationName":"",
"Sex":"M",
"BirthDate":"1959-10-07T00:00:00",
"Adresses":[
{
"ID_Address":null,
"Address1":"1 RUE DE FRANCE",
"Address2":"",
"Address3":"",
"Address4":null,
"ZipCode":"94500",
"CityName":"MA VILLE",
"Country":{
"Id":"FR"
},
"Type":null,
"State":null,
"Priority":0,
"ScopeId":0
}
],
"Language":{
"Id":"FR"
},
"Comment":"",
"PassportNumber":"",
"IdentityCardNumber":"",
"Nationality":null,
"SocialGroup":{
"Id":1
},
"OptIns":[
{
"OptInType":"OPT_CLUB",
"OptInLabel":"Optin club",
"OptInValue":0
},
{
"OptInType":"OPT_PART",
"OptInLabel":"Optin partenaires",
"OptInValue":0
}
],
"WebLogin":"MONEMAIL#EMAIL.FR"
}
]
I have try a query like this:
This Query try to get differents informations about this JSON.
declare #JSON_CONTACT nvarchar(MAX)
SELECT #JSON_CONTACT = '[
{
"Communications":[
{
"ID_Communication":null,
"CommunicationType":"HOME",
"CommunicationValue":"0602060206",
"Priority":0,
"Disabled":false
},
{
"ID_Communication":null,
"CommunicationType":"MOBILE",
"CommunicationValue":"0602060306",
"Priority":0,
"Disabled":false
},
{
"ID_Communication":null,
"CommunicationType":"EMAIL",
"CommunicationValue":"MONEMAIL#EMAIL.FR",
"Priority":0,
"Disabled":false
}
],
"InternalId":23126,
"ExternalId":"",
"LastUpdateDate":"2020-01-05T12:04:53",
"Type1":{
"Id":1
},
"Type2":{
"Id":2
},
"Type3":null,
"Title":{
"Id":1
},
"LastName":"TOTO",
"FirstName":"TITI",
"OrganizationName":"",
"Sex":"M",
"BirthDate":"1959-10-07T00:00:00",
"Adresses":[
{
"ID_Address":null,
"Address1":"1 RUE DE FRANCE",
"Address2":"",
"Address3":"",
"Address4":null,
"ZipCode":"94500",
"CityName":"MA VILLE",
"Country":{
"Id":"FR"
},
"Type":null,
"State":null,
"Priority":0,
"ScopeId":0
}
],
"Language":{
"Id":"FR"
},
"Comment":"",
"PassportNumber":"",
"IdentityCardNumber":"",
"Nationality":null,
"SocialGroup":{
"Id":1
},
"OptIns":[
{
"OptInType":"OPT_CLUB",
"OptInLabel":"Optin club",
"OptInValue":0
},
{
"OptInType":"OPT_PART",
"OptInLabel":"Optin partenaires",
"OptInValue":0
}
],
"WebLogin":"MONEMAIL#EMAIL.FR"
}
]'
DROP TABLE TEMP_JSON_RCT_TEST_PARSE
SELECT *
INTO TEMP_JSON_RCT_TEST_PARSE
FROM OPENJSON (#JSON_CONTACT)
WITH (
FIRSTNAME nvarchar(50) '$.FirstName',
LASTNAME nvarchar(50) '$.LastName',
Sex nvarchar(2) '$.Sex',
BirthDate date '$.BirthDate',
Communications nvarchar(max) AS JSON
) AS Communications
CROSS APPLY OPENJSON(Communications)
WITH (
CommunicationType nvarchar(50),
CommunicationValue nvarchar(50),
Adresses nvarchar(max) AS JSON
) AS Adresses
CROSS APPLY OPENJSON(Adresses)
WITH (
Address1 nvarchar(100)
)
I would like my select return:
FIRSTNAME, LASTNAME, SEX, BIRTHDATE, EMAIL, MOBILE, HOME, LASTUPDATEDATE, ADDRESS1, ADRESSE2, ADDRESSE3, ADDRESS4, ZIPCODE, CITYNAME, OPT_CLUB, OPT_PART
VALUES:
MY FIRSTNAME, MYLASTNAME, M, 09/05/1989, MONEMAIL#EMAIL.FR, 0602060306,0602060206, 2020-01-05T12:04:53, 1 RUE DE FRANCE, , , , 94500, MA VILLE, 0, 0
When I execute my query, that return null, I don't understand why.
Can you help about this ?

Answer 1

This seems to return your expected results, but note that this works only if OptIns and Communications JSON arrays has the structure in the question. You need to use OPENJSON() with explicit schema and AS JSON clause for nested JSON arrays:
SELECT
FIRSTNAME, LASTNAME, SEX, BIRTHDATE,
EMAIL, MOBILE, HOME,
LASTUPDATEDATE, ADDRESS1, ADDRESS2, ADDRESS3, ADDRESS4, ZIPCODE, CITYNAME,
OPT_CLUB, OPT_PART
FROM OPENJSON(#JSON_CONTACT, '$') WITH (
FIRSTNAME nvarchar(100) '$.FirstName',
LASTNAME nvarchar(100) '$.LastName',
SEX nvarchar(1) '$.Sex',
BIRTHDATE nvarchar(100) '$.BirthDate',
Communications nvarchar(max) '$.Communications' AS JSON,
Adresses nvarchar(max) '$.Adresses' AS JSON,
LASTUPDATEDATE nvarchar(100) '$.LastUpdateDate',
OptIns nvarchar(max) '$.OptIns' AS JSON
) j1
CROSS APPLY (
SELECT
MAX(CASE WHEN CommunicationType = 'EMAIL' THEN CommunicationValue END) AS EMAIL,
MAX(CASE WHEN CommunicationType = 'MOBILE' THEN CommunicationValue END) AS MOBILE,
MAX(CASE WHEN CommunicationType = 'HOME' THEN CommunicationValue END) AS HOME
FROM OPENJSON(j1.Communications) WITH (
CommunicationType nvarchar(100) '$.CommunicationType',
CommunicationValue nvarchar(100) '$.CommunicationValue'
)
) j2
CROSS APPLY OPENJSON(j1.Adresses) WITH (
ADDRESS1 nvarchar(100) '$.Address1',
ADDRESS2 nvarchar(100) '$.Address2',
ADDRESS3 nvarchar(100) '$.Address3',
ADDRESS4 nvarchar(100) '$.Address4',
ZIPCODE nvarchar(100) '$.ZipCode',
CITYNAME nvarchar(100) '$.CityName'
) j3
CROSS APPLY (
SELECT
MAX(CASE WHEN OptInType = 'OPT_CLUB' THEN OptInValue END) AS OPT_CLUB,
MAX(CASE WHEN OptInType = 'OPT_PART' THEN OptInValue END) AS OPT_PART
FROM OPENJSON(j1.OptIns) WITH (
OptInType nvarchar(100) '$.OptInType',
OptInValue int '$.OptInValue'
)
) j4
Result (with the JOSN in the question):
FIRSTNAME LASTNAME SEX BIRTHDATE EMAIL MOBILE HOME LASTUPDATEDATE ADDRESS1 ADDRESS2 ADDRESS3 ADDRESS4 ZIPCODE CITYNAME OPT_CLUB OPT_PART
TITI TOTO M 1959-10-07T00:00:00 MONEMAIL#EMAIL.FR 0602060306 0602060206 2020-01-05T12:04:53 1 RUE DE FRANCE 94500 MA VILLE 0 0

Answer 2

Address is part of main entity
SELECT *
FROM OPENJSON (#JSON_CONTACT)
WITH (
FIRSTNAME nvarchar(50) '$.FirstName',
LASTNAME nvarchar(50) '$.LastName',
Sex nvarchar(2) '$.Sex',
BirthDate date '$.BirthDate',
Communications nvarchar(max) AS JSON,
Adresses nvarchar(max) AS JSON
) AS Communications
CROSS APPLY OPENJSON(Communications)
WITH (
CommunicationType nvarchar(50),
CommunicationValue nvarchar(50)
) AS Adresses
CROSS APPLY OPENJSON(Adresses)
WITH (
Address1 nvarchar(100)
)