Find value

I have a database Im trying to reverse engineer. Is it possible to search all tables, and then all fields the values for a particular value?

Im thinking it would have to be a PowerShell script, but no idea where to start. I think it would have to be something like:-

$dbConnection = msql_connect("localhost","SA","myPassword","myDBInstance")
foreach ($table in $db_Connection) {
     foreach ($field in $table) {
          if $dbConnection.sql "Select count(*) from $table where `$filed` = 'myValue''" > 0 {
               response-write "Found value in $table.$field
           }
     }
}

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Any ideas where to even start on this (excluding google :-) )

Thank you