exec_sql: exec_sql [option] ["SQL"]

    -i        turn on  CGI mode and set DATAs received from server
    --------------------- show infomations ---------------------
    -h item   help {\"SQL\", ALL,OPTION,ERRCODE}
    -v        show PostgreSQL and PGBASH VERSION
    -m        show CONNECTION NAMEs
    -s        show STATUS after executing SQL
    --------------------- temporary options --------------------
    -d conn   set  CONNECTION NAME
    -e        turn on  ECHO  query sent to the backend
    -q        turn on  QUIET system/sql error messages
    -P        turn on  PLAIN format(-P is default in normal mode)
    -H        turn on  HTML  format(-H is default in CGI    mode)
    -X        turn on  EXPANDED  format
    -L        turn on  OUTER_FRAME  of PLAIN text
    -T        turn off TOP_header   print
    -B        turn off BOTTOM_count print
    -A        turn off ALIGNMENT    of PLAIN text(e.g. -PXA)
    -C cap    set CAPTION of HTML/PLAIN table(e.g. -C 'TITLE')
    -O opt    set OPTION  of HTML table tag(e.g. -O 'BORDER=0')
    -S sep    set SEPARATOR of PLAIN text field (default is '|')
    -N null   set NULL_STRING(e.g. -N '*N*')
    -Z zero   set ZERO_STRINg(e.g. -Z '*0*') 
    --------------------- execute function  --------------------
    -x func   execute func(e.g. lo_import, lo_export, lo_unlink)