NAME

SQL::Tokenizer - A simple SQL tokenizer.

VERSION

0.20

SYNOPSIS

 use SQL::Tokenizer qw(tokenize_sql);

 my $query= q{SELECT 1 + 1};
 my @tokens= SQL::Tokenizer->tokenize($query);

 # @tokens now contains ('SELECT', ' ', '1', ' ', '+', ' ', '1')

 @tokens= tokenize_sql($query); # procedural interface

DESCRIPTION

SQL::Tokenizer is a simple tokenizer for SQL queries. It does not claim to be a parser or query verifier. It just creates sane tokens from a valid SQL query.

It supports SQL with comments like:

 -- This query is used to insert a message into
 -- logs table
 INSERT INTO log (application, message) VALUES (?, ?)

Also supports '', "" and \' escaping methods, so tokenizing queries like the one below should not be a problem:

 INSERT INTO log (application, message)
 VALUES ('myapp', 'Hey, this is a ''single quoted string''!')

API

tokenize_sql

 use SQL::Tokenizer qw(tokenize_sql);

 my @tokens= tokenize_sql($query);
 my $tokens= tokenize_sql($query);

 $tokens= tokenize_sql( $query, $remove_white_tokens );

tokenize_sql can be imported to current namespace on request. It receives a SQL query, and returns an array of tokens if called in list context, or an arrayref if called in scalar context.

tokenize

 my @tokens= SQL::Tokenizer->tokenize($query);
 my $tokens= SQL::Tokenizer->tokenize($query);

 $tokens= SQL::Tokenizer->tokenize( $query, $remove_white_tokens );

This is the only available class method. It receives a SQL query, and returns an array of tokens if called in list context, or an arrayref if called in scalar context.

If $remove_white_tokens is true, white spaces only tokens will be removed from result.

ACKNOWLEDGEMENTS

Evan Harris, for implementing Shell comment style and SQL operators.
Charlie Hills, for spotting a lot of important issues I haven't thought.
Jonas Kramer, for fixing MySQL quoted strings and treating dot as punctuation character correctly.
Emanuele Zeppieri, for asking to fix SQL::Tokenizer to support dollars as well.
Nigel Metheringham, for extending the dollar signal support.
Devin Withers, for making it not choke on CR+LF in comments.
Luc Lanthier, for simplifying the regex and make it not choke on backslashes.

AUTHOR

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.