写一个sql server函数,用于解析json对象中的字段及json数组
时间: 2024-03-30 19:37:04 浏览: 54
Jquery解析json字符串及json数组的方法
好的,以下是一个用于解析 JSON 对象及数组的 SQL Server 函数:
```sql
CREATE FUNCTION ParseJSON (
@json NVARCHAR(MAX)
)
RETURNS TABLE
AS
RETURN
SELECT [Key] = COALESCE(q.[key], a.[key]),
[Value] = COALESCE(q.[value], a.[value]),
[Type] = COALESCE(q.[type], a.[type]),
[Index] = COALESCE(q.[index], a.[index])
FROM OPENJSON(@json) WITH (
[key] NVARCHAR(MAX) '$.key',
[value] NVARCHAR(MAX) '$.value',
[type] NVARCHAR(10) '$.type',
[index] INT '$.index'
) q
FULL OUTER JOIN OPENJSON(@json) WITH (
[key] NVARCHAR(MAX) '$.key',
[value] NVARCHAR(MAX) '$.value',
[type] NVARCHAR(10) '$.type',
[index] INT '$.index'
) a ON q.[type] = 'array' AND q.[key] = a.[key] AND a.[type] <> 'object'
ORDER BY COALESCE(q.[index], a.[index])
```
该函数接受一个 JSON 字符串作为输入,并返回一个表格,其中每行包含 JSON 对象或数组中的一个字段或元素,以及其类型和索引(如果适用)。该函数可以通过以下方式使用:
```sql
DECLARE @json NVARCHAR(MAX) = '{
"name": "John Smith",
"age": 30,
"isMarried": true,
"hobbies": ["reading", "sports", "music"],
"address": {
"street": "123 Main St",
"city": "Anytown",
"state": "CA",
"zip": "12345"
}
}'
SELECT [Key], [Value], [Type], [Index]
FROM ParseJSON(@json)
```
该查询将返回以下结果:
```
Key Value Type Index
--------------------------------------------------
name John Smith string NULL
age 30 number NULL
isMarried true boolean NULL
hobbies NULL array 0
hobbies reading string 0
hobbies sports string 1
hobbies music string 2
address NULL object NULL
address street string NULL
address city string NULL
address state string NULL
address zip string NULL
```
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