annotate Lib/IMPL/SQL/Schema.pm @ 169:fd92830036c3

corrected IMPL::SQL::Schema::Diff
author sourcer
date Tue, 17 May 2011 00:04:28 +0400
parents 1f7a6d762394
children d1676be8afcc
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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 IMPL::_core::version;
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5
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6 use IMPL::lang qw(is :declare :constants);
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7
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8 use parent qw(
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9 IMPL::Object
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10 IMPL::Object::Disposable
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11 IMPL::Object::Autofill
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12 IMPL::Object::Clonable
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13 );
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14
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15 use IMPL::Class::Property::Direct;
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16
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17 require IMPL::SQL::Schema::Table;
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18
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19 __PACKAGE__->PassThroughArgs;
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20
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21 BEGIN {
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22 public _direct property version => PROP_GET;
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23 public _direct property name => PROP_GET;
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24 private _direct property tables => PROP_GET;
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25 }
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26
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27 sub AddTable {
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28 my ($this,$table) = @_;
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29
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30 if (UNIVERSAL::isa($table,'IMPL::SQL::Schema::Table')) {
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31
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32 $table->Schema == $this or die new IMPL::InvalidOperationException('The specified table must belong to the database');
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33 not exists $this->{$tables}->{$table->name} or die new IMPL::InvalidOperationException('a table with the same name already exists in the database');
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34
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35 } elsif (UNIVERSAL::isa($table,'HASH')) {
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36
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37 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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38 $table = { %$table };
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39 $table->{'schema'} = $this;
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40 $table = new IMPL::SQL::Schema::Table(%{$table});
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41 } else {
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42 die new IMPL::InvalidArgumentException('Either a table object or a hash with table parameters is required');
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43 }
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44
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45 $this->{$tables}{$table->name} = $table;
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46 }
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47
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48 sub RemoveTable {
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49 my ($this,$table) = @_;
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50
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51 my $tn = UNIVERSAL::isa($table,'IMPL::SQL::Schema::Table') ? $table->name : $table;
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52
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53 $table = delete $this->{$tables}{$tn} or die new IMPL::InvalidArgumentException('The table doesn\'t exists',$tn);
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54
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55 # drop foreign keys
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56 map { $_->table->RemoveConstraint($_) } values %{$table->primaryKey->connectedFK} if $table->primaryKey;
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57
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58 # drop table contents
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59 $table->Dispose();
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60
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61 return 1;
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62 }
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63
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64 sub ResolveTable {
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65 my ($this,$table) = @_;
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66
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67 UNIVERSAL::isa($table,'IMPL::SQL::Schema::Table') ? $table : $this->{$tables}{$table};
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68 }
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69
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70 sub GetTable {
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71 my ($this,$tableName) = @_;
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72 return $this->{$tables}{$tableName};
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73 }
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74
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75 sub GetTables {
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76 my ($this) = @_;
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77
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78 return wantarray ? values %{$this->{$tables}} : [values %{$this->{$tables}}];
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79 }
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80
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81 sub RenameTable {
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82 my ($this,$oldName,$newName) = @_;
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83
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84 die new IMPL::InvalidOperationException("A source table doesn't exists", $oldName) unless exists $this->{$tables}{$oldName};
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85 die new IMPL::InvalidOperationException("A target table already exists", $newName) if exists $this->{$tables}{$newName};
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86
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87 my $table = delete $this->{$tables}{$oldName};
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88 $table->_setName($newName);
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89 $this->{$tables}{$newName} = $table;
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90 }
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91
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92 sub Dispose {
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93 my ($this) = @_;
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94
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95 $_->Dispose foreach values %{$this->{$tables}};
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96
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97 delete $this->{$tables};
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98
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99 $this->SUPER::Dispose;
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100 }
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101
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102 1;
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103
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104 __END__
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105 =pod
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106
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107 =head1 SYNOPSIS
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108
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109 =begin code
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110
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111 require IMPL::SQL::Schema;
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112 use IMPL::SQL::Types qw(Varchar Integer);
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113
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114 my $dbSchema = new IMPL::SQL::Schema;
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115
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116 my $tbl = $dbSchema->AddTable({name => 'Person' });
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117 $tbl->AddColumn({
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118 name => 'FirstName',
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119 canBeNull => 1,
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120 type => Varchar(255)
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121 });
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122 $tbl->AddColumn({
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123 name => 'Age',
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124 type => Integer
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125 });
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126
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127 # so on
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128
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129 # and finally don't forget to
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130
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131 $dbSchema->Dispose();
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132
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133 =end code
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134
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135 =head1 DESCRIPTION
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136
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137 Схема реляциоонной базы данных, орентированная на язык SQL, содержит описания таблиц
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138 которые являются частью базы. Позволяет создавать и удалать таблицы.
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139
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140 =head1 MEMBERS
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141
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142 =over
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143
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144 =item C<CTOR(%props)>
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145
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146 Конструктор заполняет объект свойствами из C<props>.
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147
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148 =item C<[get]name>
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149
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150 Имя схемы.
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151
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152 =item C<[get]version>
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153
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154 Версия схемы.
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155
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156 =item C<AddTable($table)>
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157
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158 Доавляет таблицу в схему. C<$table> может быть либо таблице, либо хешем с набором
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159 свойств для создания новой таблицы. Если таблица с таким именем уже существует в сехеме,
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160 то вызывается исключение.
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161
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162 =item C<GetTable($name)>
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163
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164 Возвращает таблицу с именем C<$name> или C<undef>.
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165
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166 =item C<GetTables()>
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167
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168 Возвращает список таблиц. В скалярном контексте - ссылку на массив с таблицами.
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169
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170 =item C<ResolveTable($table)>
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171
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172 Если параметр C<$table> - таблица, то возвращается C<$table>, если C<$table> строка, то
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173 ищется таблица с таким именем, если таблица не найдена, возвращается C<undef>.
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174
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175 =item C<RenameTable($oldName,$newName)>
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176
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177 Происходит переименование таблицы. Если C<$oldName> не существует, либо если C<$newName>
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178 существует, вызывается исключение.
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179
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180 =item C<RemoveTable($table)>
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181
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182 Удаляется таблица C<$table> с удалением всех связей и ограничений. Если такой таблицы нет,
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183 то вызывается исключение. C<$table> может быть либо именем таблицы, либо объектом.
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184
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185 =back
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186
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187 =cut