xiyoo0812 / lmdb

lmdb的lua封装库！

lmdb

lmdb的lua封装库！

依赖

• lua5.2以上
• luakit一个luabind库
• 项目路径如下
  |--proj
   |--lua
   |--lmdb
   |--luakit

编译

• msvc: 准备好lua依赖库并放到指定位置，将proj文件加到sln后编译。
• linux: 准备好lua依赖库并放到指定位置，执行make -f lmdb.mak

注意事项

• mimalloc: 参考quanta使用，不用则在工程文件中注释

用法

-- lmdb_test.lua
local log_debug     = logger.debug
local jsoncodec     = json.jsoncodec

local MDB_CREATE    = lmdb.MDB_DBI_FLAG.MDB_CREATE
local MDB_NOSUBDIR  = lmdb.MDB_ENV_FLAG.MDB_NOSUBDIR
local MDB_FIRST     = lmdb.MDB_CUR_OP.MDB_FIRST
local MDB_NEXT      = lmdb.MDB_CUR_OP.MDB_NEXT
local MDB_SET       = lmdb.MDB_CUR_OP.MDB_SET

local driver = lmdb.create()
local jcodec = jsoncodec()

driver.set_max_dbs(10)
driver.set_codec(jcodec)
driver.open("./lmdb/xxx.mdb", MDB_NOSUBDIR, 0644)

driver.begin_txn("test", MDB_CREATE)
local a = driver.put("abc1", {a=123})
local b = driver.put("abc2", "234")
local c = driver.put("abc3", "235")
local d = driver.put("abc4", "236")
log_debug("put: {}-{}-{}-{}", a, b, c, d)
driver.commit_txn()

driver.begin_txn("test")
for i = 1, 6 do
    local da,rc = driver.get("abc" .. i)
    log_debug("get-{}: {}-{}", i, da,rc)
end
driver.commit_txn()

driver.cursor_open("test")
local r, k, v = driver.cursor_get("abc1", MDB_SET )
while v do
    log_debug("cursor: {}={}->{}", k, v, r)
    r, k, v = driver.cursor_get(0, MDB_NEXT )
end
driver.cursor_close()

a = driver.quick_put("abc4", {a=234}, "test")
b = driver.quick_put("abc5", "235", "test")
log_debug("quick_put: {}-{}", a, b)
for i = 1, 6 do
    local da,rc = driver.quick_get("abc" .. i, "test")
    log_debug("quick_get-{}: {}-{}", i, da,rc)
end

b = driver.quick_del("abc4", "test")
a = driver.quick_del("abc5", "test")
log_debug("quick_del: {}-{}", a, b)
for i = 1, 6 do
    local da,rc = driver.quick_get("abc" .. i, "test")
    log_debug("quick_del_get-{}: {}-{}", i, da,rc)
end

local objects = { a = true, b = 3, c = 3 }
local s = driver.batch_put(objects, "test")
log_debug("batch_put: {}", s)

local x = driver.batch_get({"a", "b", "c", "d"}, "test")
log_debug("batch_get: {}", x)

local g = driver.batch_del({"a", "b", "c", "d"}, "test")
log_debug("batch_del: {}", g)

local y = driver.batch_get({"a", "b", "c", "d"}, "test")
log_debug("batch_get: {}", y)

local dp = driver.quick_drop("test", true)
log_debug("quick_drop: {}", dp)

driver.cursor_open("test")
r, k, v = driver.cursor_get("abc1", MDB_FIRST )
while v do
    log_debug("cursor2: {}={}->{}", k, v, r)
    r, k, v = driver.cursor_get(0, MDB_NEXT )
end
driver.cursor_close()