you must install ctrlp.vim before start using this plugin.
xmap <F4> <Plug>(send-to-term)
nmap <F4> <Plug>(send-to-term-line)
let g:ctrlp_extensions = ['sqlterm']
let g:sqlterm_tnsnames_ora = '/path_to/tnsnames.ora'
let g:sqlterm_default_username = 'defaultuser'
nmap <leader>ts :CtrlPsqlterm<cr>