Question

我有一个存储在SQL服务器中的Json数据：

{  
"group":{  
  "operator":"AND",
  "rules":[  
     {  
        "condition":"=",
        "field":"F1",
        "table":"ATT",
        "data":"TEST",
        "readOnly":false,
        "hidden":false,
        "$$hashKey":"005"
     },
     {  
        "condition":"=",
        "field":"CLASS",
        "table":"OBJ",
        "data":"A1",
        "readOnly":false,
        "hidden":false,
        "$$hashKey":"008"
     },
     {  
        "group":{  
           "operator":"AND",
           "rules":[  
              {  
                 "condition":"=",
                 "field":"F1",
                 "table":"ATT",
                 "data":"TEST2",
                 "readOnly":false,
                 "hidden":false,
                 "$$hashKey":"00D"
              },
              {  
                 "condition":"=",
                 "field":"F1",
                 "table":"ATT",
                 "data":"TEST3",
                 "readOnly":false,
                 "hidden":false,
                 "$$hashKey":"00G"
              }
           ]
        },
        "table":"",
        "$$hashKey":"009"
     }
  ]
}
}

如何使用SQL获取值为F1的元素字段的计数？

Answer 1

试试这个 - ＆gt;

Select Count(*)
From mytable
WHERE JSON_VALUE(Serialized, '$.field')="F1"

Answer 2

作为建议，JSON数据不应该自行存储。您应根据要存储的数据创建表和列。也许创建一个名为group的数据库，使用一个名为operator的表，它有三列，运算符，规则和规则值。所以它看起来像这样：

 Operator     Rule    RuleValue
 -------- ----------- ---------
|   #1   | condition |  =      |
|   #1   | field     |  f1     |
|   #1   | table     |  ATT    |
|   #2   | data      |  test   |

您可以根据需要更改表，但请记住JSON和XML是一种在文件中存储数据的方法。因此，在将数据存储在数据库中时，您不应将其存储在XMl或JSON

中

Answer 3

DECLARE @json NVARCHAR(MAX) = '{"group":{
    "operator":"AND",
    "rules":
        [{"condition":"=",
        "field":"F1",
        "table":"ATT",
        "data":"TEST",
        "readOnly":false,
        "hidden":false,
        "$$hashKey":"005"},
        {"condition":"=",
        "field":"BANKID",
        "table":"ATT",
        "data":"A1",
        "readOnly":false,
        "hidden":false,
        "$$hashKey":"008"}]}}';

SELECT COUNT(*) 
FROM OPENJSON(@json, '$.group.rules')
WHERE JSON_VALUE(value, '$.field') = 'F1'

你说有桌子吗？ CROSS APPLY是你的朋友：

SELECT T.[data], rules.F1_count
FROM T CROSS APPLY (
    SELECT COUNT(*) AS F1_count
    FROM OPENJSON(jsonData, '$.group.rules')
    WHERE JSON_VALUE(value, '$.field') = 'F1'
) AS rules

Json使用SQL Server查询

3 个答案: