diff --git a/lua/Trans/conf.lua b/lua/Trans/conf.lua
new file mode 100644
index 0000000..fc0049f
--- /dev/null
+++ b/lua/Trans/conf.lua
@@ -0,0 +1,39 @@
+return {
+    display = {
+        style = 'default',
+        phnoetic = true,
+        collins_star = true,
+        tag = true,
+        oxford = true,
+        history = false,
+    },
+    default_keymap = true,
+    map = {
+
+    },
+
+    view = {
+        -- TODO: style: buffer | cursor | window
+        -- style = 'buffer',
+        -- buffer_pos = 'bottom', -- only works when view.style == 'buffer'
+    },
+
+    db_path = '/home/zoran/project/neovim/ecdict-sqlite-28/stardict.db', -- FIXME: change the path
+
+    -- TODO: async process
+    -- async = false,
+
+    -- TODO:  add online translate engine
+    -- online_search = {
+    --     enable = false,
+    --     engine = {},
+    -- }
+
+    -- TODO: precise match or return closest match result
+    -- precise_match = true,
+
+    -- TODO: leamma search
+    -- leamma = false,
+
+    -- TODO: register word
+}
diff --git a/lua/Trans/database.lua b/lua/Trans/database.lua
new file mode 100644
index 0000000..295dbf9
--- /dev/null
+++ b/lua/Trans/database.lua
@@ -0,0 +1,22 @@
+local M = {}
+-- local db = require('Trans').db
+local dict = require("Trans").dict
+
+function M.query(arg)
+    -- TODO: return type: a result table:
+    local res = {}
+    if type(arg) == 'string' then
+        res = dict:select('stardict', {
+            where = { word = arg },
+        })
+    elseif type(arg) == 'table' then
+        res = dict:select('stardict', arg)
+    else
+        vim.notify('query argument error!')
+    end
+
+    vim.pretty_print(res)
+    return res[1]
+end
+
+return M
diff --git a/lua/Trans/display.lua b/lua/Trans/display.lua
new file mode 100644
index 0000000..448da83
--- /dev/null
+++ b/lua/Trans/display.lua
@@ -0,0 +1,28 @@
+-- local conf = require("Trans").conf
+local M = {}
+-- {
+--     audio = "",
+--     bnc = 5222,
+--     definition = "n. slang for sexual intercourse",
+--     exchange = "d:fucked/p:fucked/i:fucking/3:fucks/s:fucks",
+--     frq = 5040,
+--     id = 1180286,
+--     phonetic = "fʌk",
+--     pos = "n:37/v:63",
+--     sw = "fuck",
+--     tag = "",
+--     translation = "vt. 与...性交, 欺骗, 诅咒\nvi. 性交\nn. 性交, 些微, 杂种\ninterj. 他妈的, 混帐",
+--     word = "fuck"
+--  } 
+--
+
+function M.query_cursor()
+    -- TODO: 
+end
+
+
+function M.query()
+    -- TODO: 
+end
+
+return M
diff --git a/lua/Trans/init.lua b/lua/Trans/init.lua
index ccde006..9efde8c 100644
--- a/lua/Trans/init.lua
+++ b/lua/Trans/init.lua
@@ -1,6 +1,5 @@
 local M = {}
 
-
 -- NOTE:
 -- Style:
 --      [minimal]: one line with '/'
@@ -8,54 +7,16 @@ local M = {}
 --      [full]:    show all description in different lines
 -- TODO: other style
 
-
-local default_conf =
-{
-    display = {
-        style = 'default',
-        phnoetic = true,
-        collins_star = true,
-        tag = true,
-        oxford = true,
-        -- TODO: frequency
-        -- frequency = false,
-        history = false,
-    },
-    default_keymap = true,
-    map = {
-
-    },
-    
-    view = {
-        -- TODO: style: buffer | cursor | window
-        -- style = 'buffer',
-        -- buffer_pos = 'bottom', -- only works when view.style == 'buffer'
-    },
-
-    db_path = '/home/zoran/project/neovim/ecdict-sqlite-28/stardict.db', -- FIXME: change the path
-
-    -- TODO: async process
-    async = false,
-
-    -- TODO:  add online translate engine
-    -- online_search = {
-    --     enable = false,
-    --     engine = {},
-    -- }
-
-    -- TODO: precise match or return closest match result
-    -- precise_match = true,
-
-    -- TODO: leamma search
-    -- leamma = false,
-
-    -- TODO: register word
-}
-
-M.conf = default_conf
-
-function M:setup(conf)
-    self.config = vim.tbl_extend('force', default_conf, conf)
+M.conf = require("Trans.conf")
+function M.setup(conf)
+    M.conf = vim.tbl_extend('force', M.conf, conf)
+    require("Trans.setup")
 end
 
+M.db = require("sqlite.db")
+M.dict = M.db:open(M.conf.db_path)
+M.query = require("Trans.display").query
+M.query_cursor = require("Trans.display").query_cursor
+
+
 return M
diff --git a/lua/Trans/query.lua b/lua/Trans/query.lua
deleted file mode 100644
index 6aba8b4..0000000
--- a/lua/Trans/query.lua
+++ /dev/null
@@ -1,6 +0,0 @@
-local sqlite = require("sqlite")
-local conf = require('Trans').conf
-
-local path = conf.db_path
-
-local db = sqlite.new(conf.db_path)
diff --git a/lua/Trans/setup.lua b/lua/Trans/setup.lua
new file mode 100644
index 0000000..cf570ec
--- /dev/null
+++ b/lua/Trans/setup.lua
@@ -0,0 +1,22 @@
+local db = require("Trans").db
+local conf = require("Trans").conf
+
+local group = vim.api.nvim_create_augroup('closedb', { clear = true })
+vim.api.nvim_create_autocmd('VimLeave', {
+    group = group,
+    pattern = '*',
+    callback = function()
+        if db:isopen() then
+            db:close()
+        end
+    end,
+})
+
+vim.api.nvim_create_user_command('TranslateCurosorWord', require("Trans").query_cursor, {
+
+})
+
+
+if conf.default_keymap then
+    --- TODO: keymap
+end