查询json格式的表

Question

I would like to know how can I read with a sql query a table like that: (this is just an example)

id,date,information
1,2018-26-02,{[{"iteration_number":0,"data":{"name":"Toto",values:{"PV":78,"SV":20,"TV":19},"state":"ok"},{"iteration_number":1,"data":{"name":"Baba",values:{"PV":68,"SV":10,"TV":11},"state":"ok"}}}]}

For example, to select the date of the first record, I will write: "SELECT date FROM table1 WHERE id=1;

But if I just would like the name of the iteration number 0 ? (Toto)

Say me if I'm not understandable.

Thanks for your response.

Simon

Answer 1

In MSSQL there is a JSON_VALUE function you can use for this:

More documentation can be found here .

DECLARE @temp_table TABLE
(
    id INT NOT NULL IDENTITY(1, 1),
    date DATETIME NOT NULL,
    information VARCHAR(MAX) NOT NULL
);

INSERT INTO @temp_table
    (date, information)
VALUES 
    (GETDATE(), '[{"iteration_number":1,"data":{"name":"Toto",values:{"PV":78,"SV":20,"TV":19},"state":"ok"},{"iteration_number":1,"data":{"name":"Baba",values:{"PV":68,"SV":10,"TV":11},"state":"ok"}}}]');


SELECT date, JSON_VALUE(information,'$[0].data.name') AS Name
FROM @temp_table