After mysql5.7, the database supports json type.
The good use of this type in the project is that you can insert a string json of any length without specifying the length.
But I encountered a problem in querying the data of our project, that is, the Chinese key.
Then I followed the path normal method to query the English as normal.
When I query the Chinese, there was a problem.
The solution is not to use Chinese keys. . . . . .