Question 109208 in Json Question posted in
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How to search MS SQL column in JSON array

I have several columns in my database. In one of these columns is a JSON string like: fyvfvv.

[
  {
    "Value": "0000138010687",  
    "Name": "Code"
  }
]

I need to select those rows from the database, whose JSON is filled with the value of the mask "0000****", or the value is greater than a certain number.
Can you tell me how to do it in the best way?

Tags:

2

Answers


  1. 0

    You need to parse the stored JSON with OPENJSON() and use the appropriate WHERE clause.

    Data:

    SELECT *
INTO JsonTable
FROM (VALUES
   ('[{"Value": "00001380", "Name": "Code"}]'),
   ('[{"Value": "0000138010688", "Name": "Code"}]'),
   ('[{"Value": "0000138010689", "Name": "Code"}]')
) v (JsonColumn)

    Statement (to get the rows):

    SELECT *
FROM JsonTable t
WHERE EXISTS (
   SELECT 1
   FROM OPENJSON(t.JsonColumn) WITH (
      [Value] varchar(100) '$.Value',
      [Name] varchar(100) '$.Name'
   )
   WHERE [Value] LIKE '0000____'  
)

    Statement (to get the rows and the parsed JSON):

    SELECT *
FROM JsonTable t
CROSS APPLY OPENJSON(t.JsonColumn) WITH (
   [Value] varchar(100) '$.Value',
   [Name] varchar(100) '$.Name'
) j
WHERE j.[Value] LIKE '0000____'

    Both statements return the correct results, even if the parsed JSON array contains more than one item.

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  2. 0

    Assuming the json array contains one element only, then we can use JSON_VALUE() to get the element value by path :

    select *
from (
  select *, 
    JSON_VALUE(JsonColumn, '$[0].Value') as theValue, 
    JSON_VALUE(JsonColumn, '$[0].Name') as theName
  from JsonTable
) as s
where theName = 'Code' and theValue like '0000%';

    Demo here

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