Hi,

I have a problem in my code which is having two DBI mysql queries in a loop. I have two tables master_table and active_table and it goes like this

Master_table 
Router_Name  Serial_No Fru_Desc Location        Status

RouterA     AA     FRUA     NULL         Online
RouterA     BB     FRUB     FPC0 PIC0     Online
RouterA     CC     FRUC     FPC1 PIC1     Online
RouterA     DD     FRUD     FPC2 PIC2     Online
RouterA     EE     FRUE     FPC3 PIC3     Online

RouterB      FF      FRUF      FPC5 PIC5      Online
RouterB     GG     FRUG     FPC6 PIC6     Online
RouterB     HH     FRUH     FPC7 PIC7     Online
RouterB     II     FRUI     FPC8 PIC8     Online
RouterB     JJ     FRUJ     FPC9 PIC9     Online

[download]
active_table 

RouterA     CC     FRUC     FPC1 PIC1     Online
RouterA     DD     FRUD     FPC2 PIC2     Online
RouterA     EE     FRUE     FPC3 PIC3     Online

RouterB         AA    FRUA    FPC0 PIC1    Online
RouterB      FF      FRUF      FPC5 PIC5      Online
RouterB     GG     FRUG     FPC6 PIC6     Online
RouterB     HH     FRUH     FPC7 PIC7     Online
RouterB     II     FRUI     FPC8 PIC8     Online
RouterB     JJ     FRUJ     FPC10 PIC10     Online

[download]
I have the code like this: 
        my $sth_m  = $dbh->prepare("Select Serial_No,Fru_Desc,Status f
+rom master_table2 where Router_Name = ?") or die "Cannot prepare mast
+er_table for selecting rows based on router name:" .$dbh->errstr;

        my $sth_a  = $dbh->prepare("Select Serial_No,Fru_Desc from act
+ive_table2 where Router_Name = ?") or die "Cannot prepare active_tabl
+e selecting rows based on router name" .$dbh->errstr;

        foreach my $rtr(@routers) {
      $sth_m->execute($rtr);
      $sth_a->execute($rtr); 
      while (my @row_master_db = $sth_m->fetchrow_array)              
+      
          {
                        push(@db_rows,[@row_master_db]);
          }
      foreach $test1(@db_rows) {
                        print @$test1;
          }
          print "\n";
                 while (my @row_active_db = $sth_a->fetchrow_array) {
                        push(@live_rows,[@row_active_db]);
                        
                }

                foreach $test2(@live_rows) {
                        print @$test2;
                }
                print "\n";
      
    .......
    (here i have the code to compare each row from @db_rows to each an
+d every row of @live_rows
    .......
}

[download]
In the above code i am printing the rows for both tables by router name wise but instead i am getting the following result. (the following output is formatted for reading purpose, irrespective of the printf in the code) 
First Iteration - Master_table

AA    FRUA    Online
BB    FRUB    Online
CC    FRUC    Online
DD    FRUD    Online
EE    FRUE    Online

First Iteration - active_table

EE    FRUE
DD    FRUD
CC    FRUC

Second iteration - Master_table

AA    FRUA
BB    FRUB
CC    FRUC
DD    FRUD
EE    FRUE
FF    FRUF    Online
GG    FRUG    Online
HH    FRUH    Online
II    FRUI    Online
JJ    FRUJ    Online

Second iteration - active_table

EE    FRUE
DD    FRUD
CC    FRUC

AA    FRUA
FF    FRUF
GG    FRUG
HH    FRUH
II    FRUI
JJ    FRUJ

[download]
In the second iteration of the loop(for RouterB), results of both the queries are returned for the first printf as well as the second printf Actually i need to get the results of first execute ($sth_m->execute) for the first printf and $sth_a->execute for the second printf.

In reply to Problem with two mysql queries in a loop by d-evil

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