Powershell connect to several INSTANCES of SQL Server - sql

Question

I need to create a script that do:
Get services where name are like MSSQL$* (in order to get all SQL Server instances services)
If the service are running, goes to check name
If the name of the service is like MSSQL$MICROSOFT##WID, throw a System.Exception
If not, try to connect to every instances running on the server, if one of them are inaccessible, throw a System.Exception
My current script:
$ErrorActionPreference = "Stop"
try {
$running = Get-Service | where {($_.Status -eq "Running") -and $_.Name -like "MSSQL*"}
$services = (Get-Service -Name 'MSSQL*')
$running.Status | Foreach-object {
if ($running.status -contains 'Running'){
if ($_.Name -ne 'MSSQL$MICROSOFT##WID'){
$instances = (get-itemproperty 'HKLM:\SOFTWARE\Microsoft\Microsoft SQL Server').InstalledInstances
foreach ($instance in $instances){
$server = "localhost"
$database = "master"
$sql = "select name from sys.databases"
$SqlConnection = New-Object System.Data.SqlClient.SqlConnection
$SqlConnection.ConnectionString = "Server=$server;Database=$database;Integrated Security=SSPI"
$SqlConnection.Open()
$SqlCmd = New-Object System.Data.SqlClient.SqlCommand
$SqlCmd.CommandText = $sql
$SqlCmd.Connection = $SqlConnection
$SqlAdapter = New-Object System.Data.SqlClient.SqlDataAdapter
$SqlAdapter.SelectCommand = $SqlCmd
$DataSet = New-Object System.Data.DataSet
$SqlAdapter.Fill($DataSet)
$SqlConnection.Close()
$DataSet.Tables[0]
$return = ($DataSet.Tables[0])
if ($return -ne $null){return 1} else {[System.Exception]}
}}
} else {[System.Exception]}
}}catch{[System.Exception]}
finally{$ErrorActionPreference = "Stop"}
Check status of services with MSSQL*
If status of services is running, check name of service, if the name of service is equal to MSSQL$MICROSOFT##WID throw a System.Exception, if not, list all instances and then, foreach instance in instances, try to connect
If the connection is successful, return 1, if not, throw System.Exception
My questions are: with this script, doesn't matter how many instances have already installed in the server, only check the default... how can I make try the connection for every instance that is running?
I need to check the connection to each instance running on the server, if there is someone stopped, or inaccessible must throw a System.Exception.
And too, is not possible use dbatools, and invokesql...
Somebody knows how to make the connection to every instances running on the server, if one of them are inaccessible, throw a System.Exception?
------------------- UPDATED ------------------------
this string succesfully connect with an example of instance
$SqlConnection.ConnectionString = "Server='localhost\NEWINSTANCE';Database=master;Integrated Security=SSPI"
I just try to send the server trough variable, but give me error...
if ($_.Name -ne 'MSSQL$MICROSOFT##WID'){
$SQLinstancesold = dir "SQLSERVER:\SQL\(local)"
$SQLinstances = $SQLinstancesold | Format-table -HideTableHeaders
foreach ($SQLinstance in $SQLInstances) {
$server = 'localhost\'+$SQLinstance;
$database = "master"
$sql = "select name from sys.databases"
$SqlConnection = New-Object System.Data.SqlClient.SqlConnection
$SqlConnection.ConnectionString = "Server='localhost\NEWINSTANCE';Database=master;Integrated Security=SSPI"
$SqlConnection.Open()
$SqlCmd = New-Object System.Data.SqlClient.SqlCommand
$SqlCmd.CommandText = $sql
$SqlCmd.Connection = $SqlConnection
$SqlAdapter = New-Object System.Data.SqlClient.SqlDataAdapter
$SqlAdapter.SelectCommand = $SqlCmd
$DataSet = New-Object System.Data.DataSet
$SqlAdapter.Fill($DataSet)
$SqlConnection.Close()
$DataSet.Tables[0]
$return = ($DataSet.Tables[0])
if ($return -ne $null){return 1} else {echo "else of return 1"}
}}
I dont know how can I pass the variable to connectionstring in order to do the connection for each instance
--------------------------- UPDATED 2 -----------------------
I just modified the script:
Import-Module SQLPS -DisableNameChecking
$ErrorActionPreference = "Stop"
try {
$running = Get-Service | where {($_.Status -eq "Running") -and $_.Name -like "MSSQL*"}
$services = (Get-Service -Name 'MSSQL*')
$running.Status | Foreach-object {
if ($running.status -contains 'Running'){
if ($_.Name -ne 'MSSQL$MICROSOFT##WID'){
$SQLinstancesold = dir "SQLSERVER:\SQL\(local)"
$SQLinstances = $SQLinstancesold | Format-table -HideTableHeaders
$server = 'localhost\'+$SQLinstance;
foreach ($SQLinstance in $SQLInstances) {
$server = 'localhost\'+$SQLinstance;
$return = Invoke-Sqlcmd -ServerInstance $server -Database master -Query "select name from sys.databases"
if ($return -ne $null){return 1} else {echo "else of return 1"}
}}
} else {echo "here"}
}
}
catch{echo "hello?"}
finally{$ErrorActionPreference = "Stop"}
This way, list all instances, and for each instance declare variable server and try to invoke-sqlcmd
But, when I try to invoke $server on $return variable, give me an error, if I write for example the name of my instance NEWINSTANCE, return 1, that is correct
How can I put variable $server in order to get all instances on invokesqlcmd?