internal/Remove-SqlDatabase.ps1

Function Remove-SqlDatabase
{
<#
.SYNOPSIS
Internal function. Uses SMO's KillDatabase to drop all user connections then drop a database. $server is
an SMO server object.
#>

    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true)]
        [Alias("ServerInstance", "SqlServer")]
        [object]$SqlInstance,
        [Parameter(Mandatory = $true)]
        [string]$DBName,
        [PSCredential]$SqlCredential
    )
    
    $escapedname = "[$dbname]"
    
    try
    {
        $server = Connect-SqlInstance -SqlInstance $SqlInstance -SqlCredential $SqlCredential
        $server.KillDatabase($dbname)
        $server.Refresh()
        return "Successfully dropped $dbname on $($server.name)"
    }
    catch
    {
        try
        {
            $null = $server.ConnectionContext.ExecuteNonQuery("DROP DATABASE $escapedname")
            return "Successfully dropped $dbname on $($server.name)"
        }
        catch
        {
            try
            {
                $server.databases[$dbname].Drop()
                $server.Refresh()
                return "Successfully dropped $dbname on $($server.name)"
            }
            catch
            {
                return $_
            }
        }
    }
}