直接讀取blob zip文件而不寫入磁盤

Question

我使用ODP.net和Powershell來獲取Blob壓縮文件。

[void][System.Reflection.Assembly]::LoadFile("C:\DLL\Oracle.ManagedDataAccess.dll") 
$OracleConnexion = New-Object Oracle.ManagedDataAccess.Client.OracleConnection('User Id=test;Password="test";Data Source=10.2.2.1/TEST') 

$OracleConnexion.Open() 
$Query=$OracleConnexion.CreateCommand() 
$Query.CommandText="SELECT BLOB from MyTable Where ID=01" 
$ExecuteQuery=$Query.ExecuteReader() 

$Path = "C:\temp" 

while ($ExecuteQuery.Read()){ 

    $Localfile = New-Object IO.FileStream("$($Path)\$($ExecuteQuery["LOG_ID"]).zip",[IO.FileMode]::Create) 
    $Localfile.Write($ExecuteQuery["XML_TRACE"],0,$ExecuteQuery["XML_TRACE"].Length) 
    $Localfile.Close() 

    $Zip = [io.compression.zipfile]::OpenRead("$($Path)\$($Executequery["LOG_ID"]).zip") 
    $Stream = $Zip.Entries.Open() 
    $Reader = New-Object IO.StreamReader($stream) 
    $XML = $Reader.ReadToEnd() 

    $Reader.Close() 
    $Stream.Close() 
    $Zip.Dispose() 

    } 

正如你所看到的，第一我寫文件到磁盤$Localfile.Write然後用[io.compression.zipfile]::OpenRead我讀我的壓縮文件的內容。

我的代碼工作，但我想直接讀取我的斑點爲壓縮文件，而不將其寫入磁盤，這樣的事情：

while ($ExecuteQuery.Read()){ 

    $Zip = [io.compression.zipfile]::OpenRead($ExecuteQuery["XML_TRACE"]).zip) 
    $Stream = $Zip.Entries.Open() 
    $Reader = New-Object IO.StreamReader($stream) 
    $XML = $Reader.ReadToEnd() 
    $XML 

    $Reader.Close() 
    $Stream.Close() 
    $Zip.Dispose() 

    } 

編輯：它的工作原理與離子！

while ($ExecuteRequete.Read()){ 
$ZipStream = New-Object System.IO.Memorystream 
$ZipStream.Write($ExecuteRequete["XML_TRACE"],0,$ExecuteRequete["XML_TRACE"].Length) 
$ZipStream.Position = 0 
$Zip = [Ionic.Zip.ZipFile]::Read($ZipStream) 

$Stream = New-Object IO.MemoryStream 
$Zip.Extract($Stream) 
$stream.Position = 0 

$Reader = New-Object IO.StreamReader($stream) 
$XML = $Reader.ReadToEnd() 

$Reader.Close() 
$Stream.Close() 
$ZipStream.Dispose() 
$Zip.Dispose() 
} 

Answer 1

你不能用IO.Compression.Zipfile做到這一點，看https://msdn.microsoft.com/en-us/library/system.io.compression.zipfile_methods(v=vs.110).aspx所有可用的方法

您可以用離子拉鍊做到這一點。它可以從一個流中讀取ZIP：

clear 
Add-Type -Path "E:\sw\NuGet\Packages\DotNetZip.1.9.7\lib\net20\Ionic.Zip.dll" 
$zip = [Ionic.Zip.ZipFile]::Read($stream) 

$file = $zip | where-object { $_.FileName -eq "XMLSchema1.xsd"} 

$stream = new-object IO.MemoryStream 
$file.Extract($stream) 
$stream.Position = 0 

$reader = New-Object IO.StreamReader($stream) 
$text = $reader.ReadToEnd() 
$text 

$reader.Close() 
$stream.Close() 
$zip.Dispose() 

這裏的DOC：http://dotnetzip.herobo.com/DNZHelp/Index.html