如何将新的 JSON 数组字段添加到现有的 MySQL JSON 数组

Question

我有一个 MySQL (v5.7) 数据库，它有一个名为 deals 的表，其中包含一个名为 jdeal_status 的 JSON 列。

此列包含以下格式的数据：

{
   "trackIssues":[
      {
         "date":[
            "2020-01-28T12:04:42-05:00"
         ],
         "notes":[
            {
               "date":"2020-01-28T12:30:46-05:00",
               "name":"Joe Robbs",
               "note":"New note"
            },
            {
               "date":"2020-01-28T17:45:29-05:00",
               "name":"John Ha",
               "note":"New attachment"
            }
         ],
         "value":3000,
         "isResolved":false,
         "issueIndex":0
      },
      { ...other array objects },
   ]
 }

我想将一个名为attachments 的新数组字段添加到trackIssues 数组（在trackIssues[0] 处），如果它不存在，或者如果它存在则追加到它。但是，我坚持只是将新字段添加到现有数组中。

我已尝试执行以下操作：

UPDATE deals set jdeal_status = JSON_ARRAY_APPEND(jdeal_status, '$.trackIssues[0]', 
JSON_OBJECT(
    'attachments', 
    JSON_OBJECT(
      'date', "2020-01-28T12:04:42-05:00",
      'file', 'yyyy.pdf'
    ) 
))  WHERE id = 2;"

但它附加到 trackIssues 数组而不是 [0] 处的元素，如下所示：

{
   "trackIssues":[
      [
         {
            "date":[
               "2020-01-28T12:04:42-05:00"
            ],
            "notes":[
               {
                  "date":"2020-01-28T12:30:46-05:00",
                  "name":"Joe Robbs",
                  "note":"New note"
               },
               {
                  "date":"2020-01-28T17:45:29-05:00",
                  "name":"John Ha",
                  "note":"New attachment"
               }
            ],
            "value":3000,
            "isResolved":false,
            "issueIndex":0
         },
         {
            "attachments":{
               "date":"2020-01-28T12:04:42-05:00",
               "file":"yyyy.pdf"
            }
         }
      ]
   ]
 }

而我想要这个：

   "trackIssues":[
      {
         "date":[
            "2020-01-28T12:04:42-05:00"
         ],
         "notes":[
            {
               "date":"2020-01-28T12:30:46-05:00",
               "name":"Joe Robbs",
               "note":"New note"
            },
            {
               "date":"2020-01-28T17:45:29-05:00",
               "name":"John Ha",
               "note":"New attachment"
            }
         ],
         "value":3000,
         "isResolved":false,
         "issueIndex":0,
         "attachments":[
            {
               "date":"2020-01-28T12:04:42-05:00",
               "file":"yyyy.pdf"
            }           
         ]       
      }
   ]
 }

我不确定为什么这不起作用，因为我不确定如何指定 trackIssues 数组 ($.trackIssues[0]) 的第一个元素。我尝试过其他方法（JSON_SET），但似乎无法解决。

任何帮助都将不胜感激，包括如何在不存在时创建或在存在时追加。

Answer 1

更新

要在数组已经存在时追加到数组，或者在数组不存在时插入，您需要使用JSON_CONTAINS_PATH 来确定数组是否已经存在，并且依赖于此，JSON_INSERT 数组作为如下所述，或使用JSON_ARRAY_APPEND 添加到数组中。完整的查询：

UPDATE deals
SET jdeal_status = CASE JSON_CONTAINS_PATH(jdeal_status, 'one', '$.trackIssues[0].attachments')
  WHEN 0 THEN JSON_INSERT(jdeal_status, '$.trackIssues[0].attachments', 
    JSON_ARRAY(
      JSON_OBJECT(
        'date', "2020-01-28T12:04:42-05:00",
        'file', 'yyyy.pdf'
      )
    )
  )
  ELSE JSON_ARRAY_APPEND(jdeal_status, '$.trackIssues[0].attachments',
    JSON_OBJECT(
      'date', "2020-01-28T12:04:42-05:00",
      'file', 'yyyy.pdf'
    )
  )
  END

Demo on dbfiddle

原答案

你需要做的是将JSON_INSERTattachments对象数组转换成$trackIssues[0]：

UPDATE deals set jdeal_status = JSON_INSERT(jdeal_status, '$.trackIssues[0].attachments', 
    JSON_ARRAY(
      JSON_OBJECT(
        'date', "2020-01-28T12:04:42-05:00",
        'file', 'yyyy.pdf'
      )
    ) 
)

Demo on dbfiddle

漂亮打印 JSON 的输出：

{
    "trackIssues": [
        {
            "date": [
                "2020-01-28T12:04:42-05:00"
            ],
            "notes": [
                {
                    "date": "2020-01-28T12:30:46-05:00",
                    "name": "Joe Robbs",
                    "note": "New note"
                },
                {
                    "date": "2020-01-28T17:45:29-05:00",
                    "name": "John Ha",
                    "note": "New attachment"
                }
            ],
            "value": 3000,
            "isResolved": false,
            "issueIndex": 0,
            "attachments": [
                {
                    "date": "2020-01-28T12:04:42-05:00",
                    "file": "yyyy.pdf"
                }
            ]
        }
    ]
}