Laurent Dami > DBIx-DataModel > DBIx::DataModel::Doc::Delta_v1

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NAME ^

DBIx::DataModel::Doc::Delta_v1 - Differences introduced in version 1.0

DESCRIPTION ^

This document is a short enumeration of the main differences introduced in version DBIx::DataModel version 1.0.

SCHEMA DECLARATION ^

Chained declarations

  DBIx::DataModel
  ->Schema(qw/MySchema ..../)
  ->Table(qw/Table1 .../)
  ->Table(qw/Table2 .../)
  ...
  ->Association(...)
  ->

instead of

  DBIx::DataModel->Schema(qw/MySchema ..../);

  MySchema->Table(qw/Table1 .../);
  MySchema->Table(qw/Table2 .../);
  ...
  MySchema->Association(...);
  MySchema->

Implicit schema name in declarations

  ->Table(qw/Table1 .../)
  ...
  ->Association([qw/Table1 .../],
                [qw/Table2 .../])

instead of

  ->Table(qw/MySchema::Table1 .../)
  ...
  ->Association([qw/MySchema::Table1 .../],
                [qw/MySchema::Table2 .../])

but explicit prefix is still possible

  ->Table(qw/My::Other::Namespace::Table1 .../)
  ...
  ->Association([qw/My::Other::Namespace::Table1 .../],
                [qw/My::Other::Namespace::Table2 .../])

Automatic schema skeleton.

  perl -MDBIx::DataModel::Schema::Generator      \
       -e "fromDBI('dbi:connection:string')" --  \
       -schema My::New::Schema > My/New/Schema.pm

  perl -MDBIx::DataModel::Schema::Generator      \
       -e "fromDBIxClass('Some::DBIC::Schema')" -- \
       -schema My::New::Schema > My/New/Schema.pm

  sqlt -f <parser> -t DBIx::DataModel::Schema::Generator <parser_input>

See DBIx::DataModel::Schema::Generator.

SCHEMA USAGE ^

Renamed classes

For a global view of the class hierarchy, see "Classes" in DBIx::DataModel::Doc::Design.

AbstractBase => Source

Classes Table and View both inherit from Source instead of AbstractTable. This internal change should be mostly invisible to users.

Cursor => Statement

The former Cursor class is now called Statement, because it has several new methods for managing the lifecycle of a query statement to the database (bind, sqlize, prepare, execute, etc.).

Renamed methods

ViewFromRoles => join

  my $view = MySchema->join(qw/Table role1 role2 .../)

instead of

  my $view = MySchema->ViewFromRoles(qw/Table role1 role2 .../)

selectFromRoles => join->select

  my $list = $obj->join(qw/role1 role2 .../)
                 ->select(-columns => ...
                          -where   => ...);

instead of

  my $list = $obj->selectFromRoles(qw/role1 role2 .../)
                 ->(-columns => ...
                    -where   => ...);

MethodFromRoles => MethodFromJoin

  My::Table->MethodFromJoin(method => qw/role1 role2 .../);

instead of

  My::Table->MethodFromRoles(method => qw/role1 role2 .../);

New methods

Statement prepare, bind, execute

See the design doc and reference doc (lifecycle, named placeholders, etc.).

Table->join

New class method join in a table or view produces a statement that can be executed on instances of that table or view.

  my $stmt = My::Table->join(qw/role1 role2 .../);
  $stmt->prepare;                           

  foreach my $obj (@instances_of_my_table) {
    my $list = $stmt->execute($obj)->all;
    ...
    # or
    $stmt->execute($obj);
    while (my $row = $stmt->next) {
      ...
    }
  }  

fetch_cached

  My::Table->fetch_cached(@primary_key);

dbiPrepareMethod

  MySchema->dbiPrepareMethod('prepareCached');

ALIASING ^

Table aliases

  MySchema->join(qw/Table|a1 role1|a2 .../)
          ->select(-columns => [qw/a1.c1 a1.c2 a2.c1 a2.c2 .../])

Source prefixes in joins

  ..->join(qw/FirstTable role1|r1 FirstTable.role2 r1.role3|r3 role2.role4/)

Column handlers follow aliases

  My::Table->ColumnType(Date => qw/date1 date2 .../);
  ...
  my $rows = My::Table->select(-columns => qw/date1|d1 date2|d2 .../);

MISC ^

Fast statements

  my $stmt = $source->select(-columns  => ...
                             -where    => ...
                             -resultAs => 'fast_statement');
  while (my $row = $stmt->next) {
    work_immedately_with($row);
  }                   

Result as flat arrayref

  my $pairs = MySchema::People->select(-columns  => [qw/pers_id firstname/],
                                       -resultAs => 'flat_arrayref');
  my %hash = @$pairs;
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