Insert Data from Json to multiple SQL tables with FK's - sql

Question

I want to get the data from a single JSON File to my SQL Database with multiple Tables.
This is the JSON File:
{
"Leads":
[
{
"id": "7dc31998-eb32-4171-a118-79837a2950ff",
"productId": "c7f3ba6f-5f8a-4472-8c03-000000000001",
"created": "2020-10-22T07:48:04.318123",
"customer": {
"city": "Hamburg",
"dateOfBirth": "1979-01-01",
"email": "max#mustermann.de",
"firstName": "max",
"netIncome": "FROM_1000_TO_1500",
"number": "123",
"occupation": "EMPLOYEE",
"phone": "[phone]",
"purchasePhase": "EVALUATING",
"street": "Spaldingstr.",
"surName": "mustermann",
"zip": "20097"
},
"request": {
"additionalCosts": 100000,
"brokerageFee": 0.068,
"city": "Stade",
"constructionType": "FOREIGN",
"cost": 500000,
"equity": 200000,
"financingRate": 0.066,
"kfwPromotion": true,
"loan": 400000,
"notaryFee": 0.02,
"realEstateTransferTax": 0.05,
"realEstateType": "APARTMENT",
"realEstateUsage": "RENT",
"zip": "21680"
}
},
{
"id": "7dc31205-eb32-4171-a118-79837a29abcd",
"productId": "c7f3ba6f-5f8a-4472-8c03-000000000001",
"created": "2020-10-23T07:48:04.318123",
"customer": {
"city": "Nürnberg",
"dateOfBirth": "1983-08-16",
"email": "mike#test.com",
"firstName": "Michael",
"netIncome": "FROM_2000_TO_2500",
"number": "123",
"occupation": "EMPLOYEE",
"phone": "[phone]",
"purchasePhase": "EVALUATING",
"street": "Spaldingstr.",
"surName": "mustermann",
"zip": "20097"
},
"request": {
"additionalCosts": 100000,
"brokerageFee": 0.068,
"city": "Stade",
"constructionType": "FOREIGN",
"cost": 500000,
"equity": 200000,
"financingRate": 0.066,
"kfwPromotion": true,
"loan": 400000,
"notaryFee": 0.02,
"realEstateTransferTax": 0.05,
"realEstateType": "APARTMENT",
"realEstateUsage": "RENT",
"zip": "21680"
}
}
]
}
This is my customer Table with customerID as Primary Key:
CREATE TABLE [dbo].[Customer] (
[customerID] INT IDENTITY (1, 1) NOT NULL,
[city] NVARCHAR (50) NULL,
[dateOfBirth] DATE NULL,
[email] NVARCHAR (50) NULL,
[firstName] NVARCHAR (50) NULL,
[netIncome] NVARCHAR (50) NULL,
[number] INT NULL,
[occupation] NVARCHAR (50) NULL,
[phone] NVARCHAR (50) NULL,
[purchasePhase] VARCHAR (50) NULL,
[street] NVARCHAR (50) NULL,
[surName] NVARCHAR (50) NULL,
[zip] INT NULL,
PRIMARY KEY CLUSTERED ([customerID] ASC)
);
The Request Table with requestID as Primary Key:
CREATE TABLE [dbo].[Request] (
[requestID] INT IDENTITY (1, 1) NOT NULL,
[additionalCosts] INT NULL,
[brokerageFee] DECIMAL (18) NULL,
[city] NVARCHAR (50) NULL,
[constructionType] NVARCHAR (50) NULL,
[cost] INT NULL,
[equity] INT NULL,
[financingRate] DECIMAL (18) NULL,
[kfwPromotion] NVARCHAR (50) NULL,
[loan] INT NULL,
[notaryFee] DECIMAL (18) NULL,
[realEstateTransferTax] DECIMAL (18) NULL,
[realEstateType] NVARCHAR (50) NULL,
[realEstateUsage] NVARCHAR (50) NULL,
[zip] INT NULL,
PRIMARY KEY CLUSTERED ([requestID] ASC)
);
the Leads Table:
CREATE TABLE [dbo].[Leads] (
[id] NVARCHAR (50) NOT NULL,
[productID] NVARCHAR (50) NULL,
[created] DATETIME2 (7) NULL,
[customerID] INT NULL,
[requestID] INT NULL,
PRIMARY KEY CLUSTERED ([id] ASC),
CONSTRAINT [FK_Leads_Customer] FOREIGN KEY ([customerID]) REFERENCES [dbo].[Customer] ([customerID]),
CONSTRAINT [FK_Leads_Request] FOREIGN KEY ([requestID]) REFERENCES [dbo].[Request] ([requestID])
);
and my Stored SQL Procedure:
alter Procedure prcInsertCustomer
(#json NVARCHAR(MAX) = '')
AS
BEGIN
DECLARE #LASTcustomerID int = 0
DECLARE #LASTRequestID int = 0
INSERT INTO dbo.Customer
SELECT city, dateOfBirth, email, firstName, netIncome, number, occupation, phone, purchasePhase, street, surName, zip
FROM OPENJSON(#json, '$.Leads')
WITH (
city NVARCHAR(50) '$.customer.city',
dateOfBirth date '$.customer.dateOfBirth',
email NVARCHAR(50) '$.customer.email',
firstName NVARCHAR(50) '$.customer.firstName',
netIncome NVARCHAR(50) '$.customer.netIncome',
number int '$.customer.number',
occupation NVARCHAR(50) '$.customer.occupation',
phone NVARCHAR(50) '$.customer.phone',
purchasePhase NVARCHAR(50) '$.customer.purchasePhase',
street NVARCHAR(50) '$.customer.street',
surName NVARCHAR(50) '$.customer.surName',
zip int '$.customer.zip'
)
SET #LASTcustomerID = IDENT_CURRENT('dbo.customer')
INSERT INTO dbo.Request
SELECT additionalCosts, brokerageFee, city, constructionType, cost, equity, financingRate, kfwPromotion, loan, notaryFee, realEstateTransferTax, realEstateType, realEstateUsage, zip
FROM OPENJSON(#json, '$.Leads')
WITH (
additionalCosts int '$.request.additionalCosts',
brokerageFee decimal(18,0) '$.request.brokerageFee',
city NVARCHAR(50) '$.request.city',
constructionType NVARCHAR(50) '$.request.constructionType',
cost int '$.request.cost',
equity int '$.request.equity',
financingRate decimal(18,0) '$.request.financingRate',
kfwPromotion NVARCHAR(50) '$.request.kfwPromotion',
loan int '$.request.loan',
notaryFee decimal(18,0) '$.request.notaryFee',
realEstateTransferTax decimal(18,0) '$.request.realEstateTransferTax',
realEstateType NVARCHAR(50) '$.request.realEstateType',
realEstateUsage NVARCHAR(50) '$.request.realEstateUsage',
zip int '$.request.zip'
)
SET #LASTRequestID = IDENT_CURRENT('dbo.Request')
INSERT INTO dbo.Leads
SELECT id, productId, created, #LASTcustomerID, #LASTRequestID
FROM OPENJSON(#json, '$.Leads')
WITH (
id NVARCHAR(50) '$.id',
productId NVARCHAR(50) '$.productId',
created datetime2(7) '$.created'
)
END
Now every time I run my stored procedure I have the Same IDs in both Leads:
And I need to proceed all Lead Items from JSON in ONE run.