This data is queried in the database.
+------------------+
| isv_order_no |
+------------------+
| 310790786370915 |
+------------------+
1 row in set (0.00 sec)
How do you know what this character is.
1. Export to sql file by sql export.
isv_order_no
310790786370915\t
2. Through the console of rds, query the data. Then copy it to the String variable in idea.