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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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33
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4 use base qw(IMPL::Object IMPL::Object::Disposable IMPL::Object::Autofill);
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32
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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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33
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10 __PACKAGE__->PassThroughArgs;
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11
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32
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12 BEGIN {
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13 public _direct property Version => prop_get;
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14 public _direct property Name => prop_get;
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15 public _direct property Tables => prop_get;
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16 }
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17
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18 sub AddTable {
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19 my ($this,$table) = @_;
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20
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21 if (UNIVERSAL::isa($table,'IMPL::SQL::Schema::Table')) {
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22 $table->Schema == $this or die new IMPL::InvalidOperationException('The specified table must belong to the database');
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23 not exists $this->{$Tables}->{$table->Name} or die new IMPL::InvalidOperationException('a table with the same name already exists in the database');
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24 } elsif (UNIVERSAL::isa($table,'HASH')) {
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25 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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26 $table->{'Schema'} = $this;
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27 $table = new IMPL::SQL::Schema::Table(%{$table});
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28 } else {
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29 die new IMPL::InvalidArgumentException('Either a table object or a hash with table parameters is required');
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30 }
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31
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32 $this->{$Tables}{$table->Name} = $table;
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33 }
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34
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35 sub RemoveTable {
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36 my ($this,$table) = @_;
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37
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38 my $tn = UNIVERSAL::isa($table,'IMPL::SQL::Schema::Table') ? $table->Name : $table;
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39 $table = delete $this->{$Tables}{$tn} or die new IMPL::InvalidArgumentException('The table doesn\'t exists',$tn);
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40
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41 # drop foreign keys
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42 map { $_->Table->RemoveConstraint($_) } values %{$table->PrimaryKey->ConnectedFK} if $table->PrimaryKey;
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43
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44 # drop table contents
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45 $table->Dispose();
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46
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47 return 1;
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48 }
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49
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50 sub Dispose {
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51 my ($this) = @_;
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52
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53 $_->Dispose foreach values %{$this->{$Tables}};
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54
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55 delete $this->{$Tables};
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56
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57 $this->SUPER::Dispose;
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58 }
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59
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60 1;
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61
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62 __END__
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63 =pod
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64
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65 =head1 SINOPSYS
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66
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67 require IMPL::SQL::Schema;
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68 use IMPL::SQL::Types qw(Varchar Integer);
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69
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70 my $dbSchema = new IMPL::SQL::Schema;
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71
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72 my $tbl = $dbSchema->AddTable({Name => 'Person' });
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73 $tbl->AddColumn({
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74 Name => 'FirstName',
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75 CanBeNull => 1,
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76 Type => Varchar(255)
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77 });
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78 $tbl->AddColumn({
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79 Name => 'Age',
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80 Type => Integer
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81 });
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82
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83 # so on
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84
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85 # and finally don't forget to
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86
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87 $dbSchema->Dispoce();
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88
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89 =head1 DESCRIPTION
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90
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91 Схема реляциоонной базы данных, орентированная на язык SQL, содержит описания таблиц
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92 которые являются частью базы. Позволяет создавать и удалать таблицы.
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93
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94 Имея две схемы можно создавать скрипты для примениения изменений схемы данных C<<IMPL::SQL::Traits>>
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95
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96 =cut
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