dbatools

1.0.171

internal/functions/Get-AdjustedTotalRowsCopied.ps1

                                function Get-AdjustedTotalRowsCopied {

    <#

    .SYNOPSIS

        The legacy bulk copy library still uses a 4 byte integer to track the number of rows copied. That 4 byte integer is subject to overflow/wraparound

        if the number of rows copied is greater than an integer can support. The SqlRowsCopiedEventArgs.RowsCopied property is defined as an Int64

        but a 4 byte integer is used in the underlying legacy library. See https://github.com/sqlcollaborative/dbatools/issues/6927 for more details.

    .DESCRIPTION

        Determines the accurate total rows copied even if the bulkcopy.RowsCopied has experienced integer wrap.

        This internal function is used from:

        Copy-DbaDbTableData.ps1

        Import-DbaCsv.ps1

        Write-DbaDbTableData.ps1

    .PARAMETER ReportedRowsCopied

        The number of rows copied as reported by the bulk copy library (i.e. https://docs.microsoft.com/en-us/dotnet/api/system.data.sqlclient.sqlrowscopiedeventargs.rowscopied)

    .PARAMETER PreviousRowsCopied

        The previous number of rows reported by the bulk copy library.

    .NOTES

        Tags: Import

        Author: Adam Lancaster https://github.com/lancasteradam

        Website: https://dbatools.io

        Copyright: (c) 2021 by dbatools, licensed under MIT

        License: MIT https://opensource.org/licenses/MIT

    #>

    [CmdletBinding()]

    param (

        $ReportedRowsCopied,

        $PreviousRowsCopied

    )

    $newRowCountAdded = 0

    if ($ReportedRowsCopied -gt 0) {

        if ($PreviousRowsCopied -ge 0) {

            $newRowCountAdded = $ReportedRowsCopied - $PreviousRowsCopied

        } else {

            # integer wrap just changed from negative to positive

            $newRowCountAdded = [math]::Abs($PreviousRowsCopied) + $ReportedRowsCopied

        }

    } elseif ($ReportedRowsCopied -lt 0) {

        if ($PreviousRowsCopied -ge 0) {

            # integer wrap just changed from positive to negative

            $newRowCountAdded = ([int32]::MaxValue - $PreviousRowsCopied) + [math]::Abs(([int32]::MinValue - ($ReportedRowsCopied))) + 1

        } else {

            $newRowCountAdded = [math]::Abs($PreviousRowsCopied) - [math]::Abs($ReportedRowsCopied)

        }

    }

    [pscustomobject]@{

        NewRowCountAdded = $newRowCountAdded

    }

}

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