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JSON_PATH_EXISTS (Transact-SQL)

  • Artikkeli

Applies to: SQL Server 2022 (16.x) Azure SQL Database Azure SQL Managed Instance

Tests whether a specified SQL/JSON path exists in the input JSON string.

Transact-SQL syntax conventions

Syntax

JSON_PATH_EXISTS( value_expression, sql_json_path )

Arguments

value_expression

A character expression.

sql_json_path

A valid SQL/JSON path to test in the input.

Return value

Returns a int value of 1 or 0 or NULL. Returns NULL if the value_expression or input is a SQL NULL value. Returns 1 if the given SQL/JSON path exists in the input or returns a non-empty sequence. Returns 0 otherwise.

The JSON_PATH_EXISTS function doesn't return errors.

Examples

Example 1

The following example returns 1 since the input JSON string contains the specified SQL/JSON path.

DECLARE @jsonInfo NVARCHAR(MAX)

SET @jsonInfo=N'{"info":{"address":[{"town":"Paris"},{"town":"London"}]}}';

SELECT JSON_PATH_EXISTS(@jsonInfo,'$.info.address'); -- 1

Example 2

The following example returns 0 since the input JSON string doesn't contain the specified SQL/JSON path.

DECLARE @jsonInfo NVARCHAR(MAX)

SET @jsonInfo=N'{"info":{"address":[{"town":"Paris"},{"town":"London"}]}}';

SELECT JSON_PATH_EXISTS(@jsonInfo,'$.info.addresses'); -- 0

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