Parse::Dia::SQL::Output::SQLite3fk(3)

NAME
Parse::Dia::SQL::Output::SQLite3fk - Create SQL for SQLite version 3, with foreign key support

SYNOPSIS
    use Parse::Dia::SQL;
    my $dia = Parse::Dia::SQL->new(file => 'foo.dia', db => 'sqlite3fk');
    print $dia->get_sql();

DESCRIPTION
This sub-class creates SQL for the SQLite database version 3.

  new
The constructor.

Object names in SQLite have no inherent limit. 60 has been arbitrarily chosen.

  _get_create_table_sql
Generate create table statement for a single table using SQLite syntax:

Includes class comments before the table definition.

Includes autoupdate triggers based on the class comment.

Includes foreign key support of the form

  foreign key(thisColumn)  references thatTable(thatColumn) {action}

Where {action} is the optional contraint condition, such as 'on delete cascade' exactly as entered in the diagram.

autoupdate triggers

If the class comment includes a line like:

<autoupdate:foo/>

Then an 'after update' trigger is generated for this table which executes the statement foo for the updated row.

Examples of use include tracking record modification dates ("<autoupdate:dtModified=datetime('now')/">) or deriving a value from another field ("<autoupdate:sSoundex=soundex(sName)/">)

  _create_pk_string
Override default functon to include foreign key clauses

  get_schema_drop
Generate drop table statments for all tables using SQLite syntax:

  drop table {foo} if exists

  get_view_drop
Generate drop view statments for all tables using SQLite syntax:

  drop view {foo} if exists

  _get_fk_drop
Foreign key enforcement is embedded in the table definitions for SQLite, so no output is required here.

  _get_drop_index_sql
drop index statement using SQLite syntax:

  drop index {foo} if exists

  get_permissions_create
SQLite doesn't support permissions, so suppress this output.

  get_permissions_drop
SQLite doesn't support permissions, so suppress this output.

  _get_create_association_sql
Foreign key enforcement is embedded in the table definitions for SQLite, so no output is required here.

TODO
Things that might get added in future versions:

Views

Views haven't been tested. They might already work, but who knows...

Other stuff

Bugs etc