在PosgreSQL有connection的情況下，刪除database或更名database

 
SELECT pg_terminate_backend(procpid) FROM pg_stat_activity WHERE datname='<db_name>';DROP DATABASE <db_name>;
SELECT pg_terminate_backend(procpid) FROM pg_stat_activity WHERE datname='<db_name>';ALTER DATABASE <old_db_name> RENAME TO <new_db_name>;