[集]Erlang常用命令整理

1、[PoolId, Hostname,Port, Username, Password, Database, LogFun, Encoding, PoolSize] =

foldl(Fun(Elem, AccIn), Acc0, List) -> Acc1　　%%AccIn初使为Acc0, Elem是List中的值，把List中的所有值都执行函数一次得到列表

lists:foldl(fun(Key, Acc) ->
    [proplists:get_value(Key, Options) | Acc]  end,  [], lists:reverse([pool_id, hostname, port, username,password,database, logfun, encoding, poolsize]))

注：这儿的Options="[{hostname,"localhost"}, {username, "root"}, {password,"sa"}, {database, "test"}]"

结果为[undefine,"localhost", undefine,"root","sa","test", undefine, undefine, undefine]

2、