How to search with multiple keys in a hash table in powershell - scripting

Question

I'm writing a Powershell script and in it I'm using a hash table to store information about database checks. The table has 5 keys (host, check, last execution time, last rep, status) and I want to search in my table for values where:
$s = $table where $host -eq $hostname -and check -eq $check
Does anyone have any idea how this is done? And if it makes any difference, the script cannot rely on .NET framework higher than 2.0
I´m new to Powershell and scripting in general so this might be very obvious but I still can't seem to find an answer on Google. Also if someone knows a good reference page for Powershell scripting I would really appreciate a link.
Gísli
EDIT: Don't see how it matters but here is a function I use to create a hash table:
function read_saved_state{
$state = #{}
$logpos = #{}
$last_log_rotate = 0
foreach($s in Get-Content $saved_state_file){
$x = $s.split('|')
if($x[0] -eq 'check'){
$state.host = $x[1]
$state.check = $x[2]
$state.lastexec = $x[3]
$state.lastrep = $x[4]
$state.status = $x[5]
}
elseif($x[0] -eq 'lastrotate'){
$last_log_rotate = $x[1]
}
elseif($x[0] -eq 'log'){
$logpos.lastpos = $x[3]
}
}
$saved_state_file has one line for each check run and can also have a line for last log rotate and last log position. There can be as many as 12 checks for one host.
I'm trying to extract a particular check, run at a particular host, and changing the lastexec_time, last_rep and status.
return $state,$logpos,$last_log_rotate
}

Answer 1

Assuming you have an array or list of hashtables (not entirely clear from the question), your syntax is pretty close:
$s = $tables | where {($_.host -eq $hostname) -and ($_.check -eq $check)}