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.IX Title "Parse::Dia::SQL::Output::SQLite3fk 3pm"
.TH Parse::Dia::SQL::Output::SQLite3fk 3pm "2018-01-01" "perl v5.26.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Parse::Dia::SQL::Output::SQLite3fk \- Create SQL for SQLite version 3, with foreign key support
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&    use Parse::Dia::SQL;
\&    my $dia = Parse::Dia::SQL\->new(file => \*(Aqfoo.dia\*(Aq, db => \*(Aqsqlite3fk\*(Aq);
\&    print $dia\->get_sql();
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This sub-class creates \s-1SQL\s0 for the SQLite database version 3.
.SS "new"
.IX Subsection "new"
The constructor.
.PP
Object names in SQLite have no inherent limit. 60 has been arbitrarily chosen.
.SS "_get_create_table_sql"
.IX Subsection "_get_create_table_sql"
Generate create table statement for a single table using SQLite
syntax:
.PP
Includes class comments before the table definition.
.PP
Includes autoupdate triggers based on the class comment.
.PP
Includes foreign key support of the form
.PP
.Vb 1
\&  foreign key(thisColumn)  references thatTable(thatColumn) {action}
.Ve
.PP
Where {action} is the optional contraint condition, such as 'on delete cascade' exactly as entered in the diagram.
.PP
\fIautoupdate triggers\fR
.IX Subsection "autoupdate triggers"
.PP
If the class comment includes a line like:
.PP
<autoupdate:\fIfoo\fR/>
.PP
Then an 'after update' trigger is generated for this table which
executes the statement \fIfoo\fR for the updated row.
.PP
Examples of use include tracking record modification dates
(\f(CW\*(C`<autoupdate:dtModified=datetime(\*(Aqnow\*(Aq)/\*(C'\fR>) or deriving a value from
another field (\f(CW\*(C`<autoupdate:sSoundex=soundex(sName)/\*(C'\fR>)
.SS "_create_pk_string"
.IX Subsection "_create_pk_string"
Override default function to include foreign key clauses
.SS "get_schema_drop"
.IX Subsection "get_schema_drop"
Generate drop table statements for all tables using SQLite syntax:
.PP
.Vb 1
\&  drop table {foo} if exists
.Ve
.SS "get_view_drop"
.IX Subsection "get_view_drop"
Generate drop view statements for all tables using SQLite syntax:
.PP
.Vb 1
\&  drop view {foo} if exists
.Ve
.SS "_get_fk_drop"
.IX Subsection "_get_fk_drop"
Foreign key enforcement is embedded in the table definitions for SQLite, so no output is required here.
.SS "_get_drop_index_sql"
.IX Subsection "_get_drop_index_sql"
drop index statement using SQLite syntax:
.PP
.Vb 1
\&  drop index {foo} if exists
.Ve
.SS "get_permissions_create"
.IX Subsection "get_permissions_create"
SQLite doesn't support permissions, so suppress this output.
.SS "get_permissions_drop"
.IX Subsection "get_permissions_drop"
SQLite doesn't support permissions, so suppress this output.
.SS "_get_create_association_sql"
.IX Subsection "_get_create_association_sql"
Foreign key enforcement is embedded in the table definitions for SQLite, so no output is required here.
.SH "TODO"
.IX Header "TODO"
Things that might get added in future versions:
.PP
\fIViews\fR
.IX Subsection "Views"
.PP
Views haven't been tested. They might already work, but who knows...
.PP
\fIOther stuff\fR
.IX Subsection "Other stuff"
.PP
Bugs etc