Hi, I am attempting to write a perfmon log parser for windows using ActiveState perl v5.8.8, using DBI since the final goal is to allow the users write a query and retrieve the data. For example something like:

perflogquery "SELECT AVG([\\server\Processor(_Total)\% User Time] FROM perfdata.csv WHERE [(PDH-CSV 4.0) (Central Standard Time) (300)] BETWEEN '1/20/2008 12:03:58 AM' AND '1/20/2008 01:27:42 AM"

The problem I am facing is with the column names. I instantiate a new db handle, connect to the csv file and bind(if that is the right word) the file to a table name. After this, I prepare the sql query and I have errors. After a little googling and perldoc reading, I found that due to the SQL standard, field names cannot contain special characters like a dot (.). So, all these tokens are translated to an underscore (_) when reading the first line of the CSV file, so all field names are `sanitized'. I also found that if we do not want this to happen, we need to set the raw_header to a true value. But, even setting the raw_header to 1 did not help.</p.

Could someone, please point me in the right direction on how to parse the query string automatically to reflect the sanitization that is done with the headings?

Below is a partial code block that I used for testing:

use strict;
use DBI;

    my $pc_csv_query_string = shift or die "usage perflogquery <queryS
+tring>";    
    my $pc_csv_file_name = "perfdata.csv";
    
    my $pc_csv_db_handle;
    my $pc_query_stmt_handle;
    
    $@ = "";
    eval{
            #Connect to CSV file or database if you will.
            $pc_csv_db_handle =
                    DBI->connect( "DBI:CSV:f_dir=.",
                                    {
                                        PrintError => 1,
                                        RaiseError => 1,
                                        AutoCommit => 0
                                    }
                                );
            
            #Turn on tracing with trace_level 2
            DBI->trace( 2, 'parse_csv_trace.log' );
            
            #We will be working with individual files for now. Maybe i
+n the
            #future, we can move to using multiple files. Here we are 
+binding
            #the perfmon table to a csv file.
            $pc_csv_db_handle -> {csv_tables} -> {perfmon} =
                            { 
                                file => $pc_csv_file_name,
                            };
            #$pc_csv_db_handle -> {raw_header} = 1; not much use even 
+if we use raw_header.
            #Prepare statement for exection.
            $pc_query_stmt_handle =
                    $pc_csv_db_handle -> prepare("$pc_csv_query_string
+");
                    
            #Execute the statement
            $pc_query_stmt_handle -> execute();
            
            # Retrieve the returned rows of data.Need to work on this.
            while ( my @row = $pc_query_stmt_handle->fetchrow_array() 
+) {
                        print ("@row \n");
            }
            
            #Clean up
            $pc_query_stmt_handle -> finish(); $pc_csv_db_handle -> di
+sconnect();
        };
    $@ and die "SQL database error: $@";
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