如何将JSON数据插入父子表

Question

I have a MySQL table with the structure below

+------------------+------------------+----------------+
|      comp_id     |       name       |     parent     |
|------------------|------------------|----------------+
|         1        |       comp1      |      NULL      |
+------------------+------------------+----------------+
|         2        |       comp2      |       1        |
+------------------+------------------+----------------+
|         3        |       comp3      |       2        |
+------------------+------------------+----------------+
|         4        |       comp4      |       2        |
+------------------+------------------+----------------+

Assuming that no data has been inserted into the table. In other words, assuming that the table is empty how should i go about the following:

1. traverse the JSON data below for entry into the table:

{
  "org_name":"paradise island",
  "daughters" : [
    {
      "org_name": "banana tree",
      "daughters": [
        {"org_name":"Yellow Banana"},
        {"org_name":"Brown Banana"}
      ]
    },
    {
      "org_name": "big banana tree",
      "daughters": [
        {"org_name":"green banana"},
        {"org_name":"yellow banana"},
        {
          "org_name": "Black banana",
          "daughters": [
            {"org_name": "red spider"}
          ]
        }
      ]
    }
  ]
}

2. what effective SQL query can I write to insert the JSON above into MYSQL database at once.

I've researched a host of resources on adjacency list model and nested models but none has been exhaustive on how inserts should be done via JSON input

Answer 1

If using uuidv4's as id's would be ok for you, you could just normalize your object with a recursive function, add uuid's as id's and construct the parental relationships. After That you just bulk insert your data with whatever database client you are using.

This is an ideal use case for UUIDV4's. The chance of a collision is very unlikely, so you can consider it production safe.

You just have to make sure, that your uuid generator is random enough. Bad implementations could lead to much higher probabillities of collisions.

I suggest using the uuid package. You can look up it's sources on github. It uses nodes crypto library as random data generator which is cryptographically strong according to the documentation

Nice to know: MongoDB's ObjectId's are created in a similar way . They also don't provide 100 percent security against collision. But they are so unlikely that they consider this chance irrelevant.

EDIT: I assumed your code runs server side in node.js. Generating uuid's in the browser is not safe, because the crypto api is still experimental and users might try to intentionally cause collisions.