annotate lib/IMPL/SQL/Schema.pm @ 420:df591e3afd10 ref20150831

sync
author cin
date Sat, 25 Feb 2017 22:35:26 +0300
parents 3ed0c58e9da3
children
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407
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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::Clonable' => undef,
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16 ],
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17 props => [
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18 version => PROP_RO | PROP_DIRECT,
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19 name => PROP_RO | PROP_DIRECT,
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20 _tables => PROP_RO | PROP_DIRECT
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21 ]
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22 };
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23
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24 sub CTOR {
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25 my ($this,%args) = @_;
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26
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27 $this->$_($args{$_}) foreach grep exists $args{$_}, qw(name version);
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28 }
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29
407
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30 sub AddTable {
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31 my ($this,$table) = @_;
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32
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33 if (is($table,Table)) {
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34
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35 $table->schema == $this or die new IMPL::InvalidOperationException('The specified table must belong to the database');
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36 not exists $this->{$_tables}->{$table->name} or die new IMPL::InvalidOperationException('a table with the same name already exists in the database');
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37
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38 } elsif (reftype($table) eq 'HASH') {
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39
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40 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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41 $table = { %$table };
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42 $table->{'schema'} = $this;
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43 $table = Table->new(%{$table});
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44 } else {
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45 die new IMPL::InvalidArgumentException('Either a table object or a hash with table parameters is required');
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46 }
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47
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48 $this->{$_tables}{$table->name} = $table;
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49 }
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50
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51 sub RemoveTable {
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52 my ($this,$table) = @_;
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53
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54 my $tn = is($table,Table) ? $table->name : $table;
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55
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56 $table = delete $this->{$_tables}{$tn} or die new IMPL::InvalidArgumentException('The table doesn\'t exists',$tn);
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57
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58 # drop foreign keys
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59 map { $_->table->RemoveConstraint($_) } values %{$table->primaryKey->connectedFK} if $table->primaryKey;
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60
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61 # drop table contents
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62 $table->Dispose();
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63
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64 return 1;
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65 }
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66
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67 sub ResolveTable {
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68 my ($this,$table) = @_;
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69
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70 is($table,Table) ? $table : $this->{$_tables}{$table};
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71 }
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72
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73 sub GetTable {
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74 my ($this,$tableName) = @_;
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75 return $this->{$_tables}{$tableName};
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76 }
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77
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78 sub GetTables {
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79 my ($this) = @_;
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80
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81 return wantarray ? values %{$this->{$_tables}} : [values %{$this->{$_tables}}];
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82 }
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83
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84 sub RenameTable {
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85 my ($this,$oldName,$newName) = @_;
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86
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87 die new IMPL::InvalidOperationException("A source table doesn't exists", $oldName) unless exists $this->{$_tables}{$oldName};
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88 die new IMPL::InvalidOperationException("A target table already exists", $newName) if exists $this->{$_tables}{$newName};
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89
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90 my $table = delete $this->{$_tables}{$oldName};
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91 $table->_setName($newName);
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92 $this->{$_tables}{$newName} = $table;
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93 }
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94
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95 sub Dispose {
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96 my ($this) = @_;
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97
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98 $_->Dispose foreach values %{$this->{$_tables}};
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99
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100 delete $this->{$_tables};
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101
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102 $this->next::method();
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103 }
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104
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105 1;
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106
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107 __END__
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108 =pod
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109
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110 =head1 SYNOPSIS
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111
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112 =begin code
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113
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114 require IMPL::SQL::Schema;
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115 use IMPL::SQL::Types qw(Varchar Integer);
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116
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117 my $dbSchema = new IMPL::SQL::Schema;
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118
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119 my $tbl = $dbSchema->AddTable({name => 'Person' });
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120 $tbl->AddColumn({
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121 name => 'FirstName',
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122 canBeNull => 1,
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123 type => Varchar(255)
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124 });
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125 $tbl->AddColumn({
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126 name => 'Age',
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127 type => Integer
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128 });
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129
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130 # so on
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131
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132 # and finally don't forget to
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133
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134 $dbSchema->Dispose();
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135
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136 =end code
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137
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138 =head1 DESCRIPTION
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139
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140 Схема реляциоонной базы данных, орентированная на язык SQL, содержит описания таблиц
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141 которые являются частью базы. Позволяет создавать и удалать таблицы.
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142
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143 =head1 MEMBERS
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144
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145 =over
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146
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147 =item C<CTOR(%props)>
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148
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149 Конструктор заполняет объект свойствами из C<props>.
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150
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151 =item C<[get]name>
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152
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153 Имя схемы.
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154
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155 =item C<[get]version>
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156
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157 Версия схемы.
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158
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159 =item C<AddTable($table)>
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160
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161 Доавляет таблицу в схему. C<$table> может быть либо таблице, либо хешем с набором
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162 свойств для создания новой таблицы. Если таблица с таким именем уже существует в сехеме,
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163 то вызывается исключение.
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164
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165 =item C<GetTable($name)>
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166
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167 Возвращает таблицу с именем C<$name> или C<undef>.
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168
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169 =item C<GetTables()>
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170
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171 Возвращает список таблиц. В скалярном контексте - ссылку на массив с таблицами.
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172
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173 =item C<ResolveTable($table)>
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174
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175 Если параметр C<$table> - таблица, то возвращается C<$table>, если C<$table> строка, то
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176 ищется таблица с таким именем, если таблица не найдена, возвращается C<undef>.
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177
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178 =item C<RenameTable($oldName,$newName)>
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179
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180 Происходит переименование таблицы. Если C<$oldName> не существует, либо если C<$newName>
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181 существует, вызывается исключение.
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182
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183 =item C<RemoveTable($table)>
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184
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185 Удаляется таблица C<$table> с удалением всех связей и ограничений. Если такой таблицы нет,
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186 то вызывается исключение. C<$table> может быть либо именем таблицы, либо объектом.
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187
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188 =back
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189
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190 =cut