Create BDC Service Application in SharePoint 2013 / 2016 using PowerShell

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

#Configuration Parameters
$ServiceAppName = "BDC Service Application"
$ServiceAppProxyName = "BDC Service Applicatio Proxy"
$AppPoolAccount = "Crescent\SP16-AppPool"
$AppPoolName = "Service Application App Pool"
$DatabaseServer = "SP16-SQL001"
$DatabaseName = "SP16_BDC_ServiceApp"

#Check if Managed account is registered already
Write-Host -ForegroundColor Yellow "Checking if Application Pool Accounts already exists"
$AppPoolAccount = Get-SPManagedAccount -Identity $AppPoolAccount -ErrorAction SilentlyContinue
if($AppPoolAccount -eq $null)
{
    Write-Host "Please Enter the password for the Service Account..."
    $AppPoolCredentials = Get-Credential $AppPoolAccount
    $AppPoolAccount = New-SPManagedAccount -Credential $AppPoolCredentials
}

#Check if the application pool exists already
Write-Host -ForegroundColor Yellow "Checking if the Application Pool already exists"
$AppPool = Get-SPServiceApplicationPool -Identity $AppPoolName -ErrorAction SilentlyContinue
if ($AppPool -eq $null)
{
    Write-Host -ForegroundColor Green "Creating Application Pool"
    $AppPool = New-SPServiceApplicationPool -Name $AppPoolName -Account $AppPoolAccount
}

#Check if the Service application exists already
Write-Host -ForegroundColor Yellow "Checking if BDC Service Application exists already"
$ServiceApplication = Get-SPServiceApplication -Name $ServiceAppName -ErrorAction SilentlyContinue
if ($ServiceApplication -eq $null)
{
    Write-Host -ForegroundColor Green "Creating BDC Service Application"
    $ServiceApplication = New-SPBusinessDataCatalogServiceApplication –ApplicationPool $AppPoolName –DatabaseName $DatabaseName –DatabaseServer $DatabaseServer –Name $ServiceAppName
}

#Start service instance 
Write-Host -ForegroundColor Yellow "Starting the BDC Service Instance"
$ServiceInstance = Get-SPServiceInstance | Where-Object { $_.TypeName -like "*Business*" }
Start-SPServiceInstance $ServiceInstance

Write-Host -ForegroundColor Green "BDC Service Application created successfully!"