function global:SelectAllUsers()
{
    Read-Query -ConnectionString 'Server=localhost;Database=Ulysses;UID=EMEA\XJ193;PWD=somepassword;Integrated Security=true;' `
        -Query "SELECT * FROM Users" `
        -Action {
            echo "I can take an action here"
        }
}

function Read-Query
{
    param (
        [Parameter(Mandatory=$true)]
        [string]$ConnectionString,

        [Parameter(Mandatory=$true)]
        [string]$Query,

        [Parameter(Mandatory=$true)]
        [scriptblock]$Action
    )

    $SqlConnection = New-Object System.Data.SqlClient.SqlConnection
    $SqlConnection.ConnectionString = $ConnectionString
    $SqlConnection.Open()
    $SqlCmd = New-Object System.Data.SqlClient.SqlCommand
    $SqlCmd.CommandText = $Query
    $SqlCmd.Connection = $SqlConnection
    $reader = $SqlCmd.ExecuteReader()

    while ($reader.Read())
    {
        $x = $null
        $x = @{}

        for ($i = 0; $i -lt $reader.FieldCount; ++$i)
        {
            $x.add($reader.GetName($i), $reader[$i])
        }

        Invoke-Command -ScriptBlock $action -ArgumentList $x
    }

    $SqlConnection.Close()
}



SelectAllUsers