SQL Server JSON - Check if field exists by name

3lxsmp7m 于 2023-03-17 发布在其他

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I have a field name stored in the database. I would like to check if this field exists in my JSON in Angular 13 app. In XML I would do this: myXmlDoc.SelectSingleNode("/My_RootNode/id") Is it possible with JSON?

sql-server

来源：https://stackoverflow.com/questions/75745697/json-check-if-field-exists-by-name

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zbq4xfa01#

You can do this using JSON_VALUE directly in SQL Server.

SELECT *
FROM YourTable
WHERE JSON_VALUE(YourJson, '$.My_RootNode.id') IS NOT NULL;

If the id property is actually an object or array (as opposed to scalar) then use JSON_QUERY

WHERE JSON_QUERY(YourJson, '$.My_RootNode.id') IS NOT NULL;

In SQL Server 2022 you can use JSON_PATH_EXISTS for both cases

WHERE JSON_PATH_EXISTS(YourJson, '$.My_RootNode.id') = 1;

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SQL Server JSON - Check if field exists by name

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