Defines the database to use for subsequent requests.
Request
Default database
Set back to the default database.
------------------- | request | 0 | ------------------- 1 byte 1 byte
Specified database
The dbname parameter must be an ASCII character string, NOT null-terminated. It must not begins by an underscore character.
----------------------------------------- | request | dbname length | dbname ----------------------------------------- 1 byte 1 byte n bytes
Response
---------- | answer | ---------- 1 byte