$ sudo apt-get update
$ sudo apt-get install libmysqlcppconn7 

libmysqlcppconn7 is installed in your system.

Make ensure the libmysqlcppconn7 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libmysqlcppconn7 *

You will get with libmysqlcppconn7 package name, version, architecture and description in a table

libmysqlcppconn7 package basic information: