ill be back

When i needed to insert 10's of K records across a network interface i found the above method still too slow since there was an overhead for each sql call. so i went with something like this instead.


#!/usr/bin/perl -w
use warnings; 
use strict;
use DBI;
use Data::Dumper;
use POSIX qw( strftime );

my $database = 'db_name';
my $db_user = 'user';
my $db_password = 'pwd';
my $db_hostname = 'db_hostname';

my $dbh2 = DBI->connect("DBI:mysql:database=$database:host=$db_hostnam
+e",$db_user,$db_password,
    { RaiseError => 1, AutoCommit => 1, mysql_auto_reconnect => 1 } # 
+Added AutoCommit => 1, mysql_auto_reconnect => 1 while trying to make
+ it work
);
die "unable to connect to server $DBI::errstr" unless $dbh2;

my $sql2_1000 = q^
    INSERT INTO table_name (col_1, col_2, col_3, col_4, col_5)
    VALUES  ^;

$sql2_1000.=' (?,?,?,?,?) 'x1000; 
my $sth2_1000 = $dbh2->prepare($sql2_1000);
my $grp=0; 
$dbh2->begin_work; 
my @list=(); 
while(my @row = $sth1->fetchrow_array){
    $grp++; 
    if ($grp>1000) {
        $dbh2->commit;
        $dbh2->begin_work; 
        $sth2_1000->execute(@list); 
        $grp=1;
        @list=(); # edit/add 
    } 
    unless ($row[3]) {$row[3]=undef;} 
    push @list,$row[0],$row[1],$row[2],$row[3],$row[4]; 
}
$dbh2->commit;
my $sql2_n = q^
    INSERT INTO table_name (col_1, col_2, col_3, col_4, col_5)
    VALUES  ^;
my $n=scalar(@list)/5; 
$sql2_n.=' (?,?,?,?,?) ' x $n; 
my $sth2_n = $dbh2->prepare($sql2_n);
$dbh2->begin_work; 
$sth2_n->execute(@list); 
$dbh2->commit;
$sth1->finish();
$dbh2->disconnect();

[download]
notice the batching of rows per sql call, and the final creation of a insert of the exact length.

Both of these are untested code for example sake only, your mileage may vary.

In reply to Re^2: How to insert 30-50K rows into MySQL DB using DBI? by huck
in thread [SOLVED]: How to insert 30-50K rows into MySQL DB using DBI? by Perl300

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