从 Oracle 数据库 table 创建 json

Question

您好，我必须从 Oracle table 创建 json 文件。我有以下表格的数据。

我想要这种格式的数据。

{
  "add" :
  [
    {
      "canonicalName" : "Apple Computers",
      "synonyms" :
      [
    "Apple",
    "Apple Inc"
      ]
    },
    {
      "canonicalName" : "Google India",
      "synonyms" :
      [
    "Google"
      ]
    },
    {
      "canonicalName" : "IBM",
      "synonyms" :
      [
    "IBM Corporation"
      ]
    }
  ],
  "delete" :
  [
    {
      "canonicalName" : "IBM",
      "synonyms" :
      [
    "IBM Corporation"
      ]
    },
    {
      "canonicalName" : "TCS"
    }
  ],
  "update" :
  [
    {
      "canonicalName" : "Infosys",
      "synonyms" :
      [
    "Infosys Tech"
      ]
    },
    {
      "canonicalName" : "Wipro Tech",
      "synonyms" :
      [
    "Wipro Technology"
      ]
    }
  ]
}

以下代码运行正常。

with
  prep (operation, orgname, fragment) as (
    select operation, orgname,
           json_object( key 'canonicalName' value orgname,
                        key 'synonyms'
              value nullif(json_arrayagg(synonyms order by synonyms), '[]')
                                  FORMAT JSON  ABSENT ON NULL
                      )
     from   t
     group  by orgname, operation
   )
select json_objectagg( key operation
                       value json_arrayagg(fragment order by orgname)
                     ) as json_str
from   prep
group  by operation;

现在我必须在此 table 中添加一个额外的列。

因此第 tablename 列包含“ORG”和“ITEM”值。所以我必须创建 2 个文件，一个是 item.json，另一个是 ORG.json，依此类推。我需要将包含 ITEM 的数据放入 item.json，将包含 ORG 的数据放入 ORG.json。我需要在上面的查询中做哪些更改。即使 PL/SQL 也可以。您能否建议更改上述查询？

如果我们可以将结果存储到某个数组中并return调用环境

也很好

Answer 1

这是一种方法。您不需要提前知道 TABLENAME 列中的值。相反，查询输出将为 TABLENAME 中的每个唯一值一行，显示在两列中：TABLENAME 和该 TABLENAME 对应的 JSON 字符串。

with
  prep1 (tablename, operation, orgname, fragment) as (
    select tablename, operation, orgname,
           json_object( key 'canonicalName' value orgname,
                        key 'synonyms'
              value nullif(json_arrayagg(synonyms order by synonyms), '[]')
                                  FORMAT JSON  ABSENT ON NULL
                      )
     from   t
     group  by tablename, orgname, operation
   )
, prep2 (tablename, operation, org_str) as (
    select tablename, operation, json_arrayagg(fragment order by orgname)
    from   prep1
    group  by tablename, operation
  )
select tablename, json_objectagg(key operation value org_str) as json_str
from   prep2
group  by tablename
;



TABLENAME JSON_STR                                                                                                                                                                                                                                                                                                                                                                                                                
--------- ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ITEM      {"add":[{"canonicalName":"Apple Computers","synonyms":["Apple","Apple Inc"]},{"canonicalName":"Google India","synonyms":["Google"]},{"canonicalName":"IBM","synonyms":["IBM Corporation"]}],"update":[{"canonicalName":"Infosys","synonyms":["Infosys Tech"]},{"canonicalName":"Wipro Tech","synonyms":["Wipro Technology"]}],"delete":[{"canonicalName":"IBM","synonyms":["IBM Corporation"]},{"canonicalName":"TCS"}]}
ORG       {"add":[{"canonicalName":"Apple Computers","synonyms":["Apple","Apple Inc"]},{"canonicalName":"Google India","synonyms":["Google"]},{"canonicalName":"IBM","synonyms":["IBM Corporation"]}],"update":[{"canonicalName":"Infosys","synonyms":["Infosys Tech"]},{"canonicalName":"Wipro Tech","synonyms":["Wipro Technology"]}],"delete":[{"canonicalName":"IBM","synonyms":["IBM Corporation"]},{"canonicalName":"TCS"}]}

从 Oracle 数据库 table 创建 json

Creating json from Oracle database table

sql

oracle

json

oracle12c