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SQLT-DIAGRAM

NAME

sqlt−diagram − Automatically create a diagram from a database schema

SYNOPSIS

  ./sqlt−diagram −d|−f|−−from|−−db=db_parser [options] schema.sql
  Options:
    −o|−−output        Output file name (default STDOUT)
    −i|−−image         Output image type ("png" or "jpeg," default "png")
    −t|−−title         Title to give schema
    −c|−−cols          Number of columns
    −n|−−no−lines      Don't draw lines
    −−font−size        Font size ("small," "medium," "large," or "huge,"
                       default "medium")
    −−gutter           Gutter size between tables
    −−color            Add colors
    −−show−fk−only     Only show fields that act as primary
                       or foreign keys

    −−natural−join     Perform natural joins
    −−natural−join−pk  Perform natural joins from primary keys only
    −s|−−skip          Fields to skip in natural joins
    −−debug            Print debugging information

DESCRIPTION

This script will create a picture of your schema. Only the database driver argument (for SQL::Translator) is required. If no output file name is given, then image will be printed to STDOUT , so you should redirect the output into a file.

The default action is to assume the presence of foreign key relationships defined via " REFERENCES " or " FOREIGN KEY " constraints on the tables. If you are parsing the schema of a file that does not have these, you will find the natural join options helpful. With natural joins, like-named fields will be considered foreign keys. This can prove too permissive, however, as you probably don’t want a field called "name" to be considered a foreign key, so you could include it in the "skip" option, and all fields called "name" will be excluded from natural joins. A more efficient method, however, might be to simply deduce the foriegn keys from primary keys to other fields named the same in other tables. Use the "natural−join−pk" option to achieve this.

AUTHOR

Ken Y. Clark <kclark AT cpan DOT org>.

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