internal/Remove-SqlDatabase.ps1

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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 = $true)]
        [Alias("ServerInstance", "SqlInstance")]
        [object]$SqlServer,
        [Parameter(Mandatory = $true)]
        [string]$DBName,
        [System.Management.Automation.PSCredential]$SqlCredential
    )
    
    try
    {
        $server = Connect-SqlServer -SqlServer $SqlServer -SqlCredential $SqlCredential
        $server.KillDatabase($dbname)
        $server.refresh()
        Write-Output "Successfully dropped $dbname on $($server.name)"
    }
    catch
    {
        try
        {
            $server.databases[$dbname].Drop()
            Write-Output "Successfully dropped $dbname on $($server.name)"
        }
        catch
        {
            try
            {
                $null = $server.ConnectionContext.ExecuteNonQuery("DROP DATABASE $dbname")
                Write-Output "Successfully dropped $dbname on $($server.name)"
            }
            catch { return $false }
        }
    }
}