Generally, you open a single connection to a database and then perform all the required operations through it by executing a sequence of SQL statements. To open a connection, you use the connect method. The return value is a handle to the database connection that you use to perform subsequent operations on that connection.
The parameters to the connect method are as follows:
"DBI:SQLAnywhere:" and additional connection parameters separated by semicolons.
A user name. Unless this string is blank, ";UID=value" is appended to the connection string.
A password value. Unless this string is blank, ";PWD=value" is appended to the connection string.
A pointer to a hash of default values. Settings such as AutoCommit, RaiseError, and PrintError may be set in this manner.
The following code sample opens and closes a connection to the SQL Anywhere sample database. You must start the database server and sample database before running this script.
#!/usr/local/bin/perl -w # use DBI; use strict; my $database = "demo"; my $data_src = "DBI:SQLAnywhere:SERVER=$database;DBN=$database"; my $uid = "DBA"; my $pwd = "sql"; my %defaults = ( AutoCommit => 1, # Autocommit enabled. PrintError => 0 # Errors not automatically printed. ); my $dbh = DBI->connect($data_src, $uid, $pwd, \%defaults) or die "Cannot connect to $data_src: $DBI::errstr\n"; $dbh->disconnect; exit(0); __END__
Optionally, you can append the user name or password value to the data-source string instead of supplying them as separate parameters. If you do so, supply a blank string for the corresponding argument. For example, in the above script may be altered by replacing the statement that opens the connections with these statements:
$data_src .= ";UID=$uid"; $data_src .= ";PWD=$pwd"; my $dbh = DBI->connect($data_src, '', '', \%defaults) or die "Cannot connect to $data_src: $DBI::errstr\n";
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