tdbc_tokenize - TDBC SQL tokenizer

NAME  SYNOPSIS  DESCRIPTION  SEE ALSO  KEYWORDS  COPYRIGHT 

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NAME

tdbc::tokenize − TDBC SQL tokenizer

SYNOPSIS

package require tdbc 1.0

tdbc::tokenize string ______________________________________________________________________________

DESCRIPTION

As a convenience to database drivers, Tcl Database Connectivity (TDBC) provides a command to break SQL code apart into tokens so that bound variables can readily be identified and substituted.

The tdbc::tokenize command accepts as its parameter a string that is expected to contain one or more SQL statements. It returns a list of substrings; concatenating these substrings together will yield the original string. Each substring is one of the following:

	[1]		A bound variable, which begins with one of the characters ’:’, ’@’, or ’$’. The remainder of the string is the variable name and will consist of alphanumeric characters and underscores. (The leading character will be be non-numeric.)
	[2]		A semicolon that separates two SQL statements.
	[3]		Something else in a SQL statement. The tokenizer does not attempt to parse SQL; it merely identifies bound variables (distinguishing them from similar strings appearing inside quotes or comments) and statement delimiters.

SEE ALSO

tdbc(n), tdbc::connection(n), tdbc::statement(n), tdbc::resultset(n)

KEYWORDS

TDBC, SQL, database, tokenize

COPYRIGHT

Copyright (c) 2008 by Kevin B. Kenny.

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