Perl DBI - voer SQL-script uit met meerdere instructies

De database bepaalt hoeveel opdrachten er tegelijk kunnen worden uitgevoerd. Ik kan me niet herinneren of Oracle meerdere instructies per prepare toestaat of niet (MySQL wel). Probeer dit:

my $dbh = DBI->connect(
    "dbi:Oracle:dbname",
    "username",
    "password",
    {
        ChopBlanks       => 1,
        AutoCommit       => 1,
        RaiseError       => 1,
        PrintError       => 1,
        FetchHashKeyName => 'NAME_lc',
    }
);
$dbh->do("
    CREATE TABLE test_dbi1 (
        test_dbi_intr_no    NUMBER(15),
        test_dbi_name       VARCHAR2(100)
    );

    UPDATE mytable 
        SET col1=1;

    CREATE TABLE test_dbi2 (
        test_dbi_intr_no    NUMBER(15),
        test_dbi_name       VARCHAR2(100)
    );
");

$dbh->disconnect;

Natuurlijk krijgt u een betere foutafhandeling als u de verklaringen opsplitst. U kunt een eenvoudige parser gebruiken om de string op te splitsen in afzonderlijke instructies:

#!/usr/bin/perl

use strict;
use warnings;

my $sql = "
    CREATE TABLE test_dbi1 (
        test_dbi_intr_no    NUMBER(15),
        test_dbi_name       VARCHAR2(100)
    );

    UPDATE mytable
        SET col1=';yes;'
        WHERE col2=1;

    UPDATE mytable
        SET col1='Don\\'t use ;s and \\'s together, it is a pain'
        WHERE col2=1;


    CREATE TABLE test_dbi2 (
        test_dbi_intr_no    NUMBER(15),
        test_dbi_name       VARCHAR2(100)
    );
";

my @statements = ("");
#split the string into interesting pieces (i.e. tokens):
#   ' delimits strings
#   \ pass on the next character if inside a string
#   ; delimits statements unless it is in a string
#   and anything else
# NOTE: the grep { ord } is to get rid of the nul
# characters the split seems to be adding
my @tokens     = grep { ord } split /([\\';])/, $sql; 
# NOTE: this ' fixes the stupid SO syntax highlighter
#this is true if we are in a string and should ignore ; 
my $in_string  = 0;
my $escape     = 0;
#while there are still tokens to process
while (@tokens) {
    #grab the next token
    my $token = shift @tokens;
    #if we are in a string
    if ($in_string) {
        #add the token to the last statement
        $statements[-1] .= $token;
        #setup the escape if the token is \
        if ($token eq "\\") {
                $escape = 1;
                next;
        }
        #turn off $in_string if the token is ' and it isn't escaped
        $in_string = 0 if not $escape and $token eq "'";
        $escape = 0; #turn off escape if it was on
        #loop again to get the next token

        next;
    }
    #if the token is ; and we aren't in a string
    if ($token eq ';') {
        #create a new statement
        push @statements, "";
        #loop again to get the next token
        next;
    }
    #add the token to the last statement
    $statements[-1] .= $token;
    #if the token is ' then turn on $in_string
    $in_string = 1 if $token eq "'";
}
#only keep statements that are not blank
@statements = grep { /\S/ } @statements;

for my $i (0 .. $#statements) {
    print "statement $i:\n$statements[$i]\n\n";
}