Tcl8.6.14/Tk8.6.14 Documentation > TDBC Package Commands, version 1.1.7 > tdbc_tokenize

Tcl/Tk Applications | Tcl Commands | Tk Commands | [incr Tcl] Package Commands | SQLite3 Package Commands | TDBC Package Commands | tdbc::mysql Package Commands | tdbc::odbc Package Commands | tdbc::postgres Package Commands | tdbc::sqlite3 Package Commands | Thread Package Commands | Tcl C API | Tk C API | [incr Tcl] Package C API | TDBC Package C API


tdbc::tokenize — TDBC SQL tokenizer


package require tdbc 1.0

tdbc::tokenize string


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.


tdbc, tdbc::connection, tdbc::statement, tdbc::resultset


TDBC, SQL, database, tokenize


Copyright (c) 2008 by Kevin B. Kenny.
Copyright © 2008 by Kevin B. Kenny.