Recent development encountered a strange problem: when the page list is paged and queried, many pieces of exactly the same data appear. Problem, data duplication:
In the request result of the front-end page, it is found that the data obtained in the Response in the Network is normal, but the data in the Preview is duplicated
Normal data:
There are multiple duplicate data in the 10 pieces of data paged in Preview
After combing:
The preview in NetWork is wrong, but the value of response is correct.
Use Postman to make a request and find that the request value is also correct, then the problem may lie in the front end.
Reason for inquiry:
In Preview, the console will automatically convert the sent json data into javascript object format ;
The Number type in JavaScript cannot fully represent the Long type number. When the Long length is greater than 17 digits, there will be a problem of loss of precision, and some browsers will convert it to 0 for display if the length exceeds 17 digits.
solve:
1. Adjust the length of the form id field
2. Change the long type to String type in the background
Combined with reality, I chose to adjust the id length, and the problem was solved.
Since the database id is self-incrementing, the default initial value of the table id is set too large when the database script is migrated, resulting in subsequent ids with values greater than 17 digits, loss of precision during front-end processing, and data duplication;
Problem script/error source: delete or give a small initial value
