json - 嵌套存储在字符串变量中的 JSON 对象

Question

如果我想将 JSON 字符串作为变量传递，并使用 SQL Server 中的 FOR JSON PATH 将其嵌入到另一个 JSON 对象中，我该怎么做？

简明示例:

DECLARE @empInfo nvarchar(max), @msg nvarchar(max)
SET @empInfo = (SELECT '00500' as 'Company', '10000' as 'Employee' FOR JSON PATH, WITHOUT_ARRAY_WRAPPER)

SET @msg = (
    SELECT
    @empInfo as 'EmployeeInformation',
    'other data' as 'Other Data'
    FOR JSON PATH, WITHOUT_ARRAY_WRAPPER
)
SELECT @msg

在这种情况下，@msg 的格式会很糟糕。 EmployeeInformation 不应该包含引号，并且字符已被转义。

{"EmployeeInformation":"{\"Company\":\"00500\",\"Employee\":\"10000\"}","Other Data":"other data"}

Answer 1

将其包含在对 JSON_QUERY 的调用中因此它被视为 JSON 对象而不是字符串。

DECLARE @empInfo nvarchar(max), @msg nvarchar(max)
SET @empInfo = (SELECT '00500' as 'Company', '10000' as 'Employee' FOR JSON PATH, WITHOUT_ARRAY_WRAPPER)

SET @msg = (
    SELECT
     JSON_QUERY(@empInfo) as 'EmployeeInformation',
    'other data' as 'Other Data'
    FOR JSON PATH, WITHOUT_ARRAY_WRAPPER
)
SELECT @msg

返回

{
  "EmployeeInformation": {
    "Company": "00500",
    "Employee": "10000"
  },
  "Other Data": "other data"
}

代替

{
  "EmployeeInformation": "{\"Company\":\"00500\",\"Employee\":\"10000\"}",
  "Other Data": "other data"
}