使用 CROSS APPLY FOR JSON PATH 加入查询答案

【问题标题】：Join a query with CROSS APPLY FOR JSON PATH使用 CROSS APPLY FOR JSON PATH 加入查询
【发布时间】：2021-07-22 04:24:16
【问题描述】：

我有两个 SQL Server 表 ApplicationRoles 和 commonformsschema。基于SchemaId 列在两个表之间应用连接。

但是FOR JSON PATH 列名称为roles 结果出错了。

这里是选择查询：

SELECT
    fs1.SchemaId, JSON_QUERY(ar.newJson) as roles 
FROM
    commonformsschema fs1 
JOIN 
    ApplicationRoles ar1 on ar1.SchemaId = fs1.SchemaId 
CROSS APPLY 
    (SELECT 
         (SELECT 
              RoleName AS [role], 
              [create] AS [permissions.create], 
              [read] AS [permissions.read],
              [update] AS [permissions.update],
              [delete] AS [permissions.delete] 
          FROM 
              ApplicationRoles ar 
          WHERE 
              fs1.SchemaId = ar1.SchemaId 
          FOR JSON PATH, WITHOUT_ARRAY_WRAPPER) AS newJson) ar 
WHERE
    fs1.Tenant IN ('test', 'All') 
    AND ar1.RoleName IN ('Project Manager', 'Read')

完整表格详情请输入db fiddler。

当前结果：

SchemaId	roles
7a9a2521-45fb-4c9d-b7d9-e41927118119	{"role":"Senior Construction Manager","permissions":{"create":true,"read":true,"update":true,"delete":true}}
ca5d8707-fee8-4a5b-ad61-813785e32575	{"role":"Senior Construction Manager","permissions":{"create":true,"read":true,"update":true,"delete":true}}

预期结果：

SchemaId	roles
7a9a2521-45fb-4c9d-b7d9-e41927118119	{"role":"Project Manager","permissions":{"create":true,"read":true,"update":false,"delete":true}}
ca5d8707-fee8-4a5b-ad61-813785e32575	{"role":"Project Manager","permissions":{"create":true,"read":true,"update":false,"delete":true}}

如何解决这个问题？请任何帮助。如果需要任何其他详细信息，请告诉我。

提前致谢。

【问题讨论】：

标签： sql json sql-server tsql

【解决方案1】：

您只需加入表并为每一行生成预期的 JSON：

SELECT 
   fs1.SchemaId,
   (
   SELECT
      ar1.RoleName AS [role],
      ar1.[create] AS [permissions.create],
      ar1.[read] AS [permissions.read],
      ar1.[update] AS [permissions.update],
      ar1.[delete] AS [permissions.delete] 
   FOR JSON PATH, WITHOUT_ARRAY_WRAPPER
   ) AS roles
FROM commonformsschema fs1 
JOIN ApplicationRoles ar1 ON ar1.SchemaId = fs1.SchemaId 
WHERE
   fs1.Tenant IN ('test', 'All') AND 
   ar1.RoleName IN ('Project Manager', 'Read')

结果：

SchemaId	roles
7a9a2521-45fb-4c9d-b7d9-e41927118119	{"role":"Project Manager","permissions":{"create":true,"read":true,"update":false,"delete":true}}
ca5d8707-fee8-4a5b-ad61-813785e32575	{"role":"Project Manager","permissions":{"create":true,"read":true,"update":false,"delete":true}}

【讨论】：