帮我解释一下这段代码吧

[lvjie630]

Public Function query(sql)

'time_start = timer()
Set query = Conn.Execute(sql)
'time_end = timer()

'dim time_str
'time_str = time_end-time_start

'dim str
'str = "["&now()&"][sql]("&time_str&") "&sql
'dim fs,hf
'set fs = CreateObject("Scripting.FileSystemObject")

'set hf = fs.OpenTextFile(server.mappath(webroot&"debug\sql.log"), 8, TRUE)

'hf.Write(str)& vbcrlf

'hf.close
'set hf = nothing
'set fs = nothing

End Function

[astly2004]

Public Function query(sql) 查询函数，参数是sql语句

'time_start = timer() 开始时间
Set query = Conn.Execute(sql) 将Conn.Execute(sql) set 给变量query
'time_end = timer() 结束时间

'dim time_str
'time_str = time_end-time_start 时间差

'dim str
'str = "["&now()&"][sql]("&time_str&") "&sql 字符串拼接
'dim fs,hf
'set fs = CreateObject("Scripting.FileSystemObject") 创建文件对象

'set hf = fs.OpenTextFile(server.mappath(webroot&"debug\sql.log"), 8, TRUE) 打开log文件

'hf.Write(str)& vbcrlf 写入log 并且换行

'hf.close 关闭文件
'set hf = nothing 释放对象
'set fs = nothing 释放对象

End Function