Write in front
Today is the second day of the sprint. I learned the remaining knowledge of Service during the day, and began to use c3p0 at night. It was found that it may be due to the particularity of Android, so it cannot be used at all. And then retreat to use the self-built connection pool, but the effect is not satisfactory. It may be because the Android project structure and the java web project structure are quite different, and the database connection pool cannot be used normally. This issue is currently being resolved. The following is the team's sprint blog:
https://www.cnblogs.com/three3/p/12728120.html