Restarting Local SQL server

# This will be executed as the following
# ECHO "BASE64STRING==" | .\script.ps1; Clear-History

# Note1: Avoid using net commands to stop and start again the server
# net stop MSSQLSERVER && net start MSSQLSERVER
# sc stop MSSQLSERVER && sc start MSSQLSERVER
# These will not automatically start dependencies like
# SQL Server Agent service and SQL Server Browser service

# Note2: Powershell Restart-Service cmdlet handles all dependencies but runs on Windows only
# powershell -command "Restart-Service MSSQLSERVER -Force"
# After MSSQLSERVER starts - cmdlet starts all previously stopped dependencies.

# On Linux SQL Server comes with systemd unit files and can be controlled through systemctl
# sudo systemctl restart mssql-server
# sudo systemctl status mssql-server

# Note3: Make sure you are running commands as admin
# Make sure to restart all SQL Server named instances if required
# When running on a cluster, the SQL Server Database Engine service
# is best managed by using Cluster Administrator

begin {}
process {
    # Stop if error. If not set, result value will be True and assumed there
    # was no problems.
    $ErrorActionPreference = "Stop"

    # Executes once for each pipeline object    
    $JSON = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($_))
    $Params=($JSON | ConvertFrom-Json)

    Write-Output "providerRecordUid=$($Params.providerRecordUid)"
    Write-Output "resourceRecordUid=$($Params.resourceRecordUid)"
    Write-Output "userRecordUid=$($Params.userRecordUid)"
    Write-Output "newPassword=$($Params.newPassword)"
    Write-Output "oldPassword=$($Params.oldPassword)"
    Write-Output "user=$($Params.user)"

    # SQL Server Instances that will be restarted (in list order)
    [string[]]$Instances = 'MSSQLSERVER', 'MSSQL$instance1', 'MSSQL$instance2'

    # restart service(s) on local machine
    foreach ($Instance in $Instances) {
        $service = Get-Service $Instance
        if ($service.Status -eq 'Running') {
            Restart-Service $Instance -Force
        } else {
            Write-Warning "Restart skipped - service $Instance not running, status: $($service.Status)"
        }
    }
}
end {}