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32
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1 use strict;
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2 package IMPL::SQL::Schema;
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3
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4 use base qw(IMPL::Object IMPL::Object::Disposable);
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5 use IMPL::Class::Property;
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6 use IMPL::Class::Property::Direct;
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7
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8 require IMPL::SQL::Schema::Table;
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9
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10 BEGIN {
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11 public _direct property Version => prop_get;
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12 public _direct property Name => prop_get;
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13 public _direct property Tables => prop_get;
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14 }
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15
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16 sub AddTable {
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17 my ($this,$table) = @_;
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18
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19 if (UNIVERSAL::isa($table,'IMPL::SQL::Schema::Table')) {
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20 $table->Schema == $this or die new IMPL::InvalidOperationException('The specified table must belong to the database');
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21 not exists $this->{$Tables}->{$table->Name} or die new IMPL::InvalidOperationException('a table with the same name already exists in the database');
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22 } elsif (UNIVERSAL::isa($table,'HASH')) {
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23 not exists $this->{$Tables}->{$table->{'Name'}} or die new IMPL::InvalidOperationException('a table with the same name already exists in the database');
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24 $table->{'Schema'} = $this;
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25 $table = new IMPL::SQL::Schema::Table(%{$table});
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26 } else {
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27 die new IMPL::InvalidArgumentException('Either a table object or a hash with table parameters is required');
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28 }
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29
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30 $this->{$Tables}{$table->Name} = $table;
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31 }
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32
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33 sub RemoveTable {
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34 my ($this,$table) = @_;
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35
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36 my $tn = UNIVERSAL::isa($table,'IMPL::SQL::Schema::Table') ? $table->Name : $table;
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37 $table = delete $this->{$Tables}{$tn} or die new IMPL::InvalidArgumentException('The table doesn\'t exists',$tn);
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38
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39 # drop foreign keys
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40 map { $_->Table->RemoveConstraint($_) } values %{$table->PrimaryKey->ConnectedFK} if $table->PrimaryKey;
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41
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42 # drop table contents
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43 $table->Dispose();
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44
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45 return 1;
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46 }
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47
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48 sub Dispose {
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49 my ($this) = @_;
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50
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51 $_->Dispose foreach values %{$this->{$Tables}};
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52
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53 delete $this->{$Tables};
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54
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55 $this->SUPER::Dispose;
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56 }
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57
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58 1;
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59
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60 __END__
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61 =pod
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62
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63 =head1 SINOPSYS
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64
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65 require IMPL::SQL::Schema;
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66 use IMPL::SQL::Types qw(Varchar Integer);
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67
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68 my $dbSchema = new IMPL::SQL::Schema;
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69
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70 my $tbl = $dbSchema->AddTable({Name => 'Person' });
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71 $tbl->AddColumn({
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72 Name => 'FirstName',
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73 CanBeNull => 1,
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74 Type => Varchar(255)
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75 });
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76 $tbl->AddColumn({
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77 Name => 'Age',
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78 Type => Integer
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79 });
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80
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81 # so on
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82
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83 # and finally don't forget to
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84
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85 $dbSchema->Dispoce();
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86
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87 =head1 DESCRIPTION
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88
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89 Схема реляциоонной базы данных, орентированная на язык SQL, содержит описания таблиц
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90 которые являются частью базы. Позволяет создавать и удалать таблицы.
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91
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92 Имея две схемы можно создавать скрипты для примениения изменений схемы данных C<<IMPL::SQL::Traits>>
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93
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94 =cut
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