internal/Update-SqlDbOwner.ps1

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Function Update-SqlDbOwner
{
<#
.SYNOPSIS
Internal function. Updates specified database dbowner.
#>

    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [object]$source,
        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [object]$destination,
        [string]$dbname,
        [System.Management.Automation.PSCredential]$SourceSqlCredential,
        [System.Management.Automation.PSCredential]$DestinationSqlCredential
    )
    
    $sourceserver = Connect-SqlServer -SqlServer $Source -SqlCredential $SourceSqlCredential
    $destserver = Connect-SqlServer -SqlServer $Destination -SqlCredential $DestinationSqlCredential
    
    $source = $sourceserver.DomainInstanceName
    $destination = $destserver.DomainInstanceName
    
    if ($dbname.length -eq 0)
    {
        $databases = ($sourceserver.Databases | Where-Object { $destserver.databases.name -contains $_.name -and $_.IsSystemObject -eq $false }).Name
    }
    else { $databases = $dbname }
    
    foreach ($dbname in $databases)
    {
        $destdb = $destserver.databases[$dbname]
        $dbowner = $sourceserver.databases[$dbname].owner
        
        if ($destdb.owner -ne $dbowner)
        {
            if ($destdb.Status -ne 'Normal') { Write-Output "Database status not normal. Skipping dbowner update."; continue }
            
            if ($dbowner -eq $null -or $destserver.logins[$dbowner] -eq $null)
            {
                try
                {
                    $dbowner = ($destserver.logins | Where-Object { $_.id -eq 1 }).Name
                }
                catch
                {
                    $dbowner = "sa"
                }
            }
            
            try
            {
                if ($destdb.ReadOnly -eq $true)
                {
                    $changeroback = $true
                    Update-SqlDbReadOnly $destserver $dbname $false
                }
                
                $destdb.SetOwner($dbowner)
                Write-Output "Changed $dbname owner to $dbowner"
                
                if ($changeroback)
                {
                    Update-SqlDbReadOnly $destserver $dbname $true
                    $changeroback = $null
                }
            }
            catch
            {
                Write-Error "Failed to update $dbname owner to $dbowner."
            }
        }
        else { Write-Output "Proper owner already set on $dbname" }
    }
}