SQL Server openjson

Posted 2023-05-08

【中文标题】SQL Server openjson

【英文标题】：

【发布时间】：2020-05-17 12:01:18

【问题描述】：

从我的 json 数据中，我需要这样的结果：我想获得两列距离和持续时间 - 谁能帮忙？

 
    "distances": [
                     [0, 6136.2, 6136.2, 0],
                     [4704.7, 0, 0, 4704.7],
                     [4704.7, 0, 0, 4704.7],
                     [0, 6136.2, 6136.2, 0]
                 ],
    "durations": [
                     [0, 554.5, 554.5, 0],
                     [446.4, 0, 0, 446.4],
                     [446.4, 0, 0, 446.4],
                     [0, 554.5, 554.5, 0]
                 ]

【问题讨论】：

像什么？你的尝试有什么不奏效的？

【参考方案1】：

这是一种方法

DECLARE @Json NVARCHAR(MAX) = N' 
    "distances": [
                     [0, 6136.2, 6136.2, 0],
                     [4704.7, 0, 0, 4704.7],
                     [4704.7, 0, 0, 4704.7],
                     [0, 6136.2, 6136.2, 0]
                 ],
    "durations": [
                     [0, 554.5, 554.5, 0],
                     [446.4, 0, 0, 446.4],
                     [446.4, 0, 0, 446.4],
                     [0, 554.5, 554.5, 0]
                 ]
'


SELECT CA.distance,
       CA.duration,
       dist1.[key] AS OuterArrayIndex,
       CA.[key] AS InnerArrayIndex
FROM   OPENJSON(JSON_QUERY(@Json, '$.distances')) dist1
       JOIN OPENJSON(JSON_QUERY(@Json, '$.durations')) dur1
         ON dist1.[key] = dur1.[key] 
CROSS APPLY
(
SELECT dist2.value AS distance,
       dur2.value  AS duration,
       dist2.[key]
FROM   OPENJSON(dist1.value) dist2
       JOIN OPENJSON(dur1.value) dur2
         ON dist2.[key] = dur2.[key] 
)CA
ORDER BY OuterArrayIndex, 
         InnerArrayIndex

返回

+----------+----------+-----------------+-----------------+
| distance | duration | OuterArrayIndex | InnerArrayIndex |
+----------+----------+-----------------+-----------------+
|        0 |        0 |               0 |               0 |
|   6136.2 |    554.5 |               0 |               1 |
|   6136.2 |    554.5 |               0 |               2 |
|        0 |        0 |               0 |               3 |
|   4704.7 |    446.4 |               1 |               0 |
|        0 |        0 |               1 |               1 |
|        0 |        0 |               1 |               2 |
|   4704.7 |    446.4 |               1 |               3 |
|   4704.7 |    446.4 |               2 |               0 |
|        0 |        0 |               2 |               1 |
|        0 |        0 |               2 |               2 |
|   4704.7 |    446.4 |               2 |               3 |
|        0 |        0 |               3 |               0 |
|   6136.2 |    554.5 |               3 |               1 |
|   6136.2 |    554.5 |               3 |               2 |
|        0 |        0 |               3 |               3 |
+----------+----------+-----------------+-----------------+

【讨论】：

@ambako 似乎您在 Martin 的回答中找到了价值。也许你应该对他的时间和才华表示感谢并接受答案