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我正在整理一个简单的 PowerShell 脚本，它将查找/替换各种数量的关键字。如果找到关键字，则应将其替换为不同的短语。

这适用于存在关键字的行，但是脚本正在删除不存在关键字的行；这不是我想要的行为。

我的期望是它将取代 KEYWORDS 并保持其他所有内容不变。

脚本：

#*=============================================
#* Script Name: SQLFILE_find_and_replace.ps1
#* Created: 12-Jun-2013
#*=============================================
#* Purpose: Intended for SQLFILE scripts
#* generated from a datapump dump file.
#*
#* Will find and replace "Create [Keyword]"
#* with "Create or Replace [Keyword]" within a
#* specified file.
#*=============================================

#Keywords for find/replace to act on; adjust as necessary.
$KEYWORDS = @("PROCEDURE","PACKAGE","FUNCTION","TYPE","SEQUENCE","VIEW","DATABASE LINK","TRIGGER")

# Get-FileName from http://blogs.technet.com/b/heyscriptingguy/archive/2009/09/01/hey-scripting-guy-september-1.aspx
Function Get-FileName($initialDirectory)
{
    [System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms") |
    Out-Null

    $OpenFileDialog = New-Object System.Windows.Forms.OpenFileDialog
    $OpenFileDialog.initialDirectory = $initialDirectory
    $OpenFileDialog.filter = "All files (*.*)| *.*"
    $OpenFileDialog.ShowDialog() | Out-Null
    $OpenFileDialog.filename
} #end function Get-FileName

#Ask user for file
$FILENAMELOC=Get-FileName -initialDirectory "C:\"


Write-Progress -Activity "Loading file" -status "$FILENAMELOC" -percentComplete 0

$file = (Get-Content -Path $FILENAMELOC)
$lines =  ($file | Measure-Object)
$lineprocessed = 0

$file |
    ForEach-Object {
        $lineprocessed = $lineprocessed + 1
        ForEach ($KEYWORD in $KEYWORDS) {
            if ($_.indexof("$KEYWORD") -ge 0) {
                if ($KEYWORD -eq "SEQUENCE" -and $_.indexof("MINVALUE") -ge 0) {
                    $SEQUENCENAME = $_.Substring($_.indexof("$KEYWORD"),$_.indexof("MINVALUE")-$_.indexof("$KEYWORD")-1)
                    $DROP = "DROP "+$SEQUENCENAME +";"
                    $CREATE = "CREATE "+$SEQUENCENAME +";"
                    $SQL = $DROP+"`r`n"+$CREATE
                    $_ -replace "CREATE $KEYWORD", $SQL
                }
                else {
                    $_ -replace "CREATE $KEYWORD", "CREATE OR REPLACE $KEYWORD"
                }
            }
        }
        Write-Progress -Activity "Replacing keywords" -status "Running" -percentComplete ([System.Math]::Round((($lineprocessed / $lines.count)*100),2))
    } |
    Set-Content $FILENAMELOC

测试文件：

This is a test.
CREATE PROCEDURE Blah
CREATE TRIGGER Boblawbla
CREATE FUNCTION
This is another test

Watch me disappear.

结果：

CREATE OR REPLACE PROCEDURE Blah
CREATE OR REPLACE TRIGGER Boblawbla
CREATE OR REPLACE FUNCTION

这是一个 Windows 7 盒子。

4

1 回答 1

2

这是你的罪魁祸首：

if ($_.indexof("$KEYWORD") -ge 0) {
  if ($KEYWORD -eq "SEQUENCE" -and $_.indexof("MINVALUE") -ge 0) {
    ...
    $_ -replace "CREATE $KEYWORD", $SQL
  } else {
    $_ -replace "CREATE $KEYWORD", "CREATE OR REPLACE $KEYWORD"
  }
}

只有 2$_ -replace ...产生管道重定向到的输出Set-Content。您似乎假设-replace操作员修改了内容$_并将Write-Host $_该行回显到管道中。两者都不是这样。$_ -replace ...从 中获取值$_，替换它找到的匹配项，并将修改后的字符串写入 STDOUT。Write-Host将消息写入控制台，而不是 STDOUT。

添加一个else分支来回显不包含任何关键字的行，你应该没问题：

if ($_.indexof("$KEYWORD") -ge 0) {
  if ($KEYWORD -eq "SEQUENCE" -and $_.indexof("MINVALUE") -ge 0) {
    ...
    $_ -replace "CREATE $KEYWORD", $SQL
  } else {
    $_ -replace "CREATE $KEYWORD", "CREATE OR REPLACE $KEYWORD"
  }
} else {
  $_
}

不过，你让这种方式太复杂了。这样的事情就足够了（如果我正确解析了您的代码）：

(Get-Content $FILENAMELOC) | % {
  $_ -replace 'CREATE SEQUENCE (\S*)', "DROP `$1;`r`nCREATE `$1" `
     -replace 'CREATE (PROCEDURE|PACKAGE|FUNCTION|TYPE|VIEW|DATABASE LINK|TRIGGER)', 'CREATE OR REPLACE $1'
} | Set-Content $FILENAMELOC
于 2013-06-28T20:10:00.927 回答