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Home: Perl Programming Help: Beginner:
MySQL problem



Apr 24, 2001, 3:19 PM

Post #1 of 4 (241 views)
MySQL problem Can't Post

can someone please help me with the following code?

i am trying to work with MySQL, but the following code doesn't do anything with the database nor return any error.

use CGI qw(:all);
use CGI qw(:cgi-lib);
use DBI;

my $sql_query = $input{'sql_query'};
my $dbh = DBI->connect("DBI:mysql:$db:$server", $login, $password);
my $table_data = $dbh->prepare("$sql_query");


print "Content-type: text/html\n\n";
if (not $dbh) { print "$DBI::errstr"; }
else { print "done"; }

thanks for the help



Apr 25, 2001, 12:40 AM

Post #2 of 4 (231 views)
Re: MySQL problem [In reply to] Can't Post

Hopefully this isn't the entire script.

use CGI qw(:all :cgi-lib); # no need to "use" CGI twice
use DBI;

my $sql_query = $input{'sql_query'}; # what query are you testing with? This could be the problem.

# You don't check for errors where they could happen

my $dbh = DBI->connect("DBI:mysql:$db:$server", $login, $password) || die $DBI::errstr;

my $table_data = $dbh->prepare("$sql_query") || die $dbh->errstr;

$table_data->execute || die $dbh->errstr;

print "Content-type: text/html\n\n";
if (not $dbh) { print "$DBI::errstr"; }
else { print "done"; }

You need to go over the DBI docs (regarding execute) some more to see why the above doesn't give an error.

It could be a combination of bad code and a bad query, but I can only guess.



Apr 25, 2001, 5:58 PM

Post #3 of 4 (224 views)
Re: MySQL problem [In reply to] Can't Post

no, this is not the entire script

and i found the the error at $table_data->execute || die $dbh->errstr with error checking, and the following is $sql_query

the error message is "Incorrect table definition; There can only be one auto column and it must be defined as a key", but i don't know how to fix it

CREATE TABLE phone_book (
first_name CHAR(20) NOT NULL,
last_name CHAR(15),
birthday CHAR(18),
email CHAR(30),
home_phone CHAR(15),
work_phone CHAR(15),
cell_phone CHAR(15),
pager CHAR(15),
fax CHAR(15),
address CHAR(25),
city CHAR(20),
state CHAR(20),
country CHAR(20),
zip_code CHAR(5),
other CHAR(100)

can you please took a look at this and tell me what is wrong with the above?

thanks so much..



Apr 26, 2001, 12:39 AM

Post #4 of 4 (218 views)
Re: MySQL problem [In reply to] Can't Post

Log into your database and try the following command.

mysql> ALTER TABLE phone_book ADD PRIMARY KEY (id);

I believe the error is from the id field being an AUTO INCREMENT field but it's not a key.

I've never seen that error, but I always use an auto increment field as the primary key.

Try that and see if it helps, check out the mySQL docs for more info on ALTER.

Good luck,



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