Extract SQL querys to seperate functions to enable easy reload of buffer contents on change

As implied in this comment I think it would be a good idea to extract all SQL query generations (even if really simple) to their own functions which would enable a very easy and simple reload functionality for SQHDatabase, SQHTable, and SQHResult buffers when using key bindings that change their contents.

Currently reloading is done like this:
open SQHDatabase -> dd to delete a database -> mysql#DropDatabase(which creates the query, executes the query with mysql#GetResultsFromQuery, deletes the buffer, and opens new buffer with mysql#ShowDatabases)

My idea is to make it work like this:
open SQHDatabase -> dd to delete a database -> mysql#DropDatabase(which creates the query, executes the query, deletes all the lines in the current buffer, gets query for showing all the databases, and executes that query with mysql#GetResultsFromQuery)
Note: the empty buffer and fill with new contents would be a separate function

Pros:

• makes all the queries really reusable
• doesn't screw up the jump list
• possibly beneficial in the future
• would tidy up some code

Cons:

• idea not really that thought out yet (probably could use improvement)

Start by tracing the SQHDatabase, SQHTable, and SQHResult buffer actions, especially mysql#DropDatabase, mysql#GetResultsFromQuery, and mysql#ShowDatabases. Identify where SQL is currently generated and how buffers are reopened. Done means query generation is reusable and buffer contents can be refreshed without reopening the buffer or disrupting the jump list.