DBD::Pg escaping placeholders with backslashes

DBD::Pg is a Perl module that provides an interface to the PostgreSQL database server. When using placeholders in DBD::Pg, you can use backslashes to escape any characters that might interfere with the SQL syntax.

Placeholders are used to substitute variables in a SQL query. For example, instead of embedding a variable directly in a SQL statement, you can use a placeholder to indicate where the value should go:

my $sth = $dbh->prepare("SELECT * FROM mytable WHERE name = ?");
$sth->execute($name);

In this example, the ? is the placeholder, and $name is the value that will be substituted into the query. DBD::Pg automatically handles the proper escaping of this value.

However, there may be cases where you want to include special characters in the value that cannot be properly handled by DBD::Pg. For example, if you want to include a single quote in the value, you can escape it with a backslash:

my $sth = $dbh->prepare("SELECT * FROM mytable WHERE name = ?");
$sth->execute('O\'Reilly');

In this example, the backslash is used to escape the single quote in the value.

Similarly, if you want to include a backslash itself in the value, you need to escape it with another backslash:

my $sth = $dbh->prepare("SELECT * FROM mytable WHERE name = ?");
$sth->execute('C:\\Program Files');

In this example, the double backslash is used to escape the single backslash in the value.

By using backslashes to escape special characters in placeholders, you can ensure that your SQL queries are properly formed and executed by DBD::Pg.

0 Lynn 1/08/2015