annotate Lib/IMPL/SQL/Schema.pm @ 320:28eba7e0c592

*web application action: added method to access HTTP request header.
author sergey
date Thu, 16 May 2013 17:16:41 +0400
parents 4ddb27ff4a0b
children
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1 use strict;
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2 package IMPL::SQL::Schema;
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3 use mro;
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4
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5 use IMPL::lang qw(is);
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6 use IMPL::Const qw(:prop);
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7 use Scalar::Util qw(reftype);
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8 use IMPL::declare {
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9 require => {
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10 Table => 'IMPL::SQL::Schema::Table'
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11 },
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12 base => [
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13 'IMPL::Object' => undef,
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14 'IMPL::Object::Disposable' => undef,
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15 'IMPL::Object::Autofill' => '@_',
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16 'IMPL::Object::Clonable' => undef,
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17 ],
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18 props => [
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19 version => PROP_RO | PROP_DIRECT,
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20 name => PROP_RO | PROP_DIRECT,
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21 _tables => PROP_RO | PROP_DIRECT
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22 ]
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23 };
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24
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25 sub AddTable {
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26 my ($this,$table) = @_;
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27
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28 if (is($table,Table)) {
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29
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30 $table->schema == $this or die new IMPL::InvalidOperationException('The specified table must belong to the database');
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31 not exists $this->{$_tables}->{$table->name} or die new IMPL::InvalidOperationException('a table with the same name already exists in the database');
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32
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33 } elsif (reftype($table) eq 'HASH') {
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34
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35 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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36 $table = { %$table };
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37 $table->{'schema'} = $this;
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38 $table = Table->new(%{$table});
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39 } else {
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40 die new IMPL::InvalidArgumentException('Either a table object or a hash with table parameters is required');
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41 }
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42
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43 $this->{$_tables}{$table->name} = $table;
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44 }
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45
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46 sub RemoveTable {
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47 my ($this,$table) = @_;
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48
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49 my $tn = is($table,Table) ? $table->name : $table;
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50
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51 $table = delete $this->{$_tables}{$tn} or die new IMPL::InvalidArgumentException('The table doesn\'t exists',$tn);
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52
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53 # drop foreign keys
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54 map { $_->table->RemoveConstraint($_) } values %{$table->primaryKey->connectedFK} if $table->primaryKey;
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55
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56 # drop table contents
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57 $table->Dispose();
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58
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59 return 1;
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60 }
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61
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62 sub ResolveTable {
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63 my ($this,$table) = @_;
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64
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65 is($table,Table) ? $table : $this->{$_tables}{$table};
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66 }
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67
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68 sub GetTable {
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69 my ($this,$tableName) = @_;
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70 return $this->{$_tables}{$tableName};
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71 }
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73 sub GetTables {
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74 my ($this) = @_;
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75
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76 return wantarray ? values %{$this->{$_tables}} : [values %{$this->{$_tables}}];
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77 }
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78
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79 sub RenameTable {
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80 my ($this,$oldName,$newName) = @_;
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81
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82 die new IMPL::InvalidOperationException("A source table doesn't exists", $oldName) unless exists $this->{$_tables}{$oldName};
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83 die new IMPL::InvalidOperationException("A target table already exists", $newName) if exists $this->{$_tables}{$newName};
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84
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85 my $table = delete $this->{$_tables}{$oldName};
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86 $table->_setName($newName);
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87 $this->{$_tables}{$newName} = $table;
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88 }
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89
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90 sub Dispose {
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91 my ($this) = @_;
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92
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93 $_->Dispose foreach values %{$this->{$_tables}};
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94
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95 delete $this->{$_tables};
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96
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97 $this->next::method();
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98 }
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99
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100 1;
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101
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102 __END__
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103 =pod
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104
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105 =head1 SYNOPSIS
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106
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107 =begin code
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108
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109 require IMPL::SQL::Schema;
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110 use IMPL::SQL::Types qw(Varchar Integer);
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111
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112 my $dbSchema = new IMPL::SQL::Schema;
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113
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114 my $tbl = $dbSchema->AddTable({name => 'Person' });
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115 $tbl->AddColumn({
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116 name => 'FirstName',
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117 canBeNull => 1,
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118 type => Varchar(255)
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119 });
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120 $tbl->AddColumn({
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121 name => 'Age',
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122 type => Integer
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123 });
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124
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125 # so on
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126
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127 # and finally don't forget to
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128
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129 $dbSchema->Dispose();
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130
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131 =end code
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132
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133 =head1 DESCRIPTION
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134
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135 Схема реляциоонной базы данных, орентированная на язык SQL, содержит описания таблиц
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136 которые являются частью базы. Позволяет создавать и удалать таблицы.
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137
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138 =head1 MEMBERS
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139
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140 =over
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141
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142 =item C<CTOR(%props)>
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143
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144 Конструктор заполняет объект свойствами из C<props>.
165
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145
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146 =item C<[get]name>
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147
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148 Имя схемы.
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149
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150 =item C<[get]version>
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151
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152 Версия схемы.
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153
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154 =item C<AddTable($table)>
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155
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156 Доавляет таблицу в схему. C<$table> может быть либо таблице, либо хешем с набором
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157 свойств для создания новой таблицы. Если таблица с таким именем уже существует в сехеме,
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158 то вызывается исключение.
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159
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160 =item C<GetTable($name)>
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161
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162 Возвращает таблицу с именем C<$name> или C<undef>.
165
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163
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164 =item C<GetTables()>
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165
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166 Возвращает список таблиц. В скалярном контексте - ссылку на массив с таблицами.
165
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167
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168 =item C<ResolveTable($table)>
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169
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170 Если параметр C<$table> - таблица, то возвращается C<$table>, если C<$table> строка, то
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171 ищется таблица с таким именем, если таблица не найдена, возвращается C<undef>.
165
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172
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173 =item C<RenameTable($oldName,$newName)>
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174
180
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175 Происходит переименование таблицы. Если C<$oldName> не существует, либо если C<$newName>
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176 существует, вызывается исключение.
165
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177
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178 =item C<RemoveTable($table)>
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179
180
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180 Удаляется таблица C<$table> с удалением всех связей и ограничений. Если такой таблицы нет,
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181 то вызывается исключение. C<$table> может быть либо именем таблицы, либо объектом.
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182
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183 =back
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184
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185 =cut