Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>I often need to do the same thing. The trick is getting the header repeated into each of the split chunks. I wrote the following cmdlet (PowerShell v2 CTP 3) and it does the trick.</p> <pre><code>############################################################################## #.SYNOPSIS # Breaks a text file into multiple text files in a destination, where each # file contains a maximum number of lines. # #.DESCRIPTION # When working with files that have a header, it is often desirable to have # the header information repeated in all of the split files. Split-File # supports this functionality with the -rc (RepeatCount) parameter. # #.PARAMETER Path # Specifies the path to an item. Wildcards are permitted. # #.PARAMETER LiteralPath # Specifies the path to an item. Unlike Path, the value of LiteralPath is # used exactly as it is typed. No characters are interpreted as wildcards. # If the path includes escape characters, enclose it in single quotation marks. # Single quotation marks tell Windows PowerShell not to interpret any # characters as escape sequences. # #.PARAMETER Destination # (Or -d) The location in which to place the chunked output files. # #.PARAMETER Count # (Or -c) The maximum number of lines in each file. # #.PARAMETER RepeatCount # (Or -rc) Specifies the number of "header" lines from the input file that will # be repeated in each output file. Typically this is 0 or 1 but it can be any # number of lines. # #.EXAMPLE # Split-File bigfile.csv 3000 -rc 1 # #.LINK # Out-TempFile ############################################################################## function Split-File { [CmdletBinding(DefaultParameterSetName='Path')] param( [Parameter(ParameterSetName='Path', Position=1, Mandatory=$true, ValueFromPipeline=$true, ValueFromPipelineByPropertyName=$true)] [String[]]$Path, [Alias("PSPath")] [Parameter(ParameterSetName='LiteralPath', Mandatory=$true, ValueFromPipelineByPropertyName=$true)] [String[]]$LiteralPath, [Alias('c')] [Parameter(Position=2,Mandatory=$true)] [Int32]$Count, [Alias('d')] [Parameter(Position=3)] [String]$Destination='.', [Alias('rc')] [Parameter()] [Int32]$RepeatCount ) process { # yeah! the cmdlet supports wildcards if ($LiteralPath) { $ResolveArgs = @{LiteralPath=$LiteralPath} } elseif ($Path) { $ResolveArgs = @{Path=$Path} } Resolve-Path @ResolveArgs | %{ $InputName = [IO.Path]::GetFileNameWithoutExtension($_) $InputExt = [IO.Path]::GetExtension($_) if ($RepeatCount) { $Header = Get-Content $_ -TotalCount:$RepeatCount } # get the input file in manageable chunks $Part = 1 Get-Content $_ -ReadCount:$Count | %{ # make an output filename with a suffix $OutputFile = Join-Path $Destination ('{0}-{1:0000}{2}' -f ($InputName,$Part,$InputExt)) # In the first iteration the header will be # copied to the output file as usual # on subsequent iterations we have to do it if ($RepeatCount -and $Part -gt 1) { Set-Content $OutputFile $Header } # write this chunk to the output file Write-Host "Writing $OutputFile" Add-Content $OutputFile $_ $Part += 1 } } } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POHow can I split a text file using PowerShell?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USJosh
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COworks nicely. Might want to turn count into a long when you want to have more lines per file. Also, this script runs out of memory if you write huge files.
      singulars
      1. PO
      1. USWouter
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload