annotate Lib/Schema/DB/Table.pm @ 77:9d24db321029

Refactoring Web::TT docs
author wizard
date Fri, 02 Apr 2010 20:18:46 +0400
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children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use strict;
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2 package Schema::DB::Table;
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3 use Carp;
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4 use Common;
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5
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6 use Schema::DB::Column;
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7 use Schema::DB::Constraint;
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8 use Schema::DB::Constraint::PrimaryKey;
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9 use Schema::DB::Constraint::ForeignKey;
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10
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11 our @ISA = qw(Object);
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12
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13 srand time;
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14
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15 BEGIN {
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16 DeclareProperty Name => ACCESS_READ;
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17 DeclareProperty Schema => ACCESS_READ;
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18 DeclareProperty Columns => ACCESS_READ;
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19 DeclareProperty Constraints => ACCESS_READ;
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20 DeclareProperty ColumnsByName => ACCESS_NONE;
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21 DeclareProperty PrimaryKey => ACCESS_READ;
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22 DeclareProperty Tag => ACCESS_ALL;
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23 }
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24
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25 sub CTOR {
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26 my ($this,%args) = @_;
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27
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28 $this->{$Name} = $args{'Name'} or die new Exception('a table name is required');
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29 $this->{$Schema} = $args{'Schema'} or die new Exception('a parent schema is required');
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30 }
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31
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32 sub InsertColumn {
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33 my ($this,$column,$index) = @_;
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34
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35 $index = ($this->{$Columns} ? scalar(@{$this->{$Columns}}) : 0) if not defined $index;
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36
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37 die new Exception("Index is out of range") if ($index < 0 || $index > ($this->{$Columns} ? scalar(@{$this->{$Columns}}) : 0));
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38
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39 if (UNIVERSAL::isa($column,'Schema::DB::Column')) {
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40
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41 } elsif (UNIVERSAL::isa($column,'HASH')) {
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42 $column = new Schema::DB::Column(%{$column});
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43 } else {
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44 die new Exception("The invalid parameter");
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45 }
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46
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47 if (exists $this->{$ColumnsByName}->{$column->Name}) {
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48 die new Exception("The column already exists",$column->name);
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49 } else {
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50 $this->{$ColumnsByName}->{$column->Name} = $column;
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51 splice @{$this->{$Columns}},$index,0,$column;
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52 }
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53
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54 return $column;
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55 }
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56
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57 sub RemoveColumn {
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58 my ($this,$NameOrColumn,$Force) = @_;
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59
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60 my $ColName;
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61 if (UNIVERSAL::isa($NameOrColumn,'Schema::DB::Column')) {
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62 $ColName = $NameOrColumn->Name;
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63 } elsif (not ref $NameOrColumn) {
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64 $ColName = $NameOrColumn;
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65 }
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66
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67 if (exists $this->{$ColumnsByName}->{$ColName}) {
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68 my $index = 0;
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69 foreach my $column(@{$this->{$Columns}}) {
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70 last if $column->Name eq $ColName;
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71 $index++;
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72 }
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73
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74 my $column = $this->{$Columns}[$index];
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75 if (my @constraints = $this->GetColumnConstraints($column)){
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76 $Force or die new Exception('Can\'t remove column which is used in the constraints',@constraints);
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77 $this->RemoveConstraint($_) foreach @constraints;
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78 }
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79
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80 my $removed = splice @{$this->{$Columns}},$index,1;
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81 delete $this->{$ColumnsByName}->{$ColName};
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82 return $removed;
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83 } else {
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84 die new Exception("The column not found",$NameOrColumn->Name);
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85 }
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86 }
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87
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88 sub Column {
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89 my ($this,$name) = @_;
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90
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91 return $this->{$ColumnsByName}->{$name};
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92 }
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93
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94 sub ColumnAt {
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95 my ($this,$index) = @_;
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96
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97 die new Exception("The index is out of range") if $index < 0 || $index >= ($this->{$Columns} ? scalar(@{$this->{$Columns}}) : 0);
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98
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99 return $this->{$Columns}[$index];
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100 }
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101
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102 sub AddConstraint {
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103 my ($this,$Constraint) = @_;
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104
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105 die new Exception('The invalid parameter') if not UNIVERSAL::isa($Constraint,'Schema::DB::Constraint');
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106
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107 $Constraint->Table == $this or die new Exception('The constaint must belong to the target table');
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108
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109 if (exists $this->{$Constraints}->{$Constraint->Name}) {
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110 die new Exception('The table already has the specified constraint',$Constraint->Name);
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111 } else {
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112 if (UNIVERSAL::isa($Constraint,'Schema::DB::Constraint::PrimaryKey')) {
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113 not $this->{$PrimaryKey} or die new Exception('The table already has a primary key');
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114 $this->{$PrimaryKey} = $Constraint;
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115 }
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116
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117 $this->{$Constraints}->{$Constraint->Name} = $Constraint;
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118 }
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119 }
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120
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121 sub RemoveConstraint {
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122 my ($this,$Constraint,$Force) = @_;
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123
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124 my $cn = UNIVERSAL::isa($Constraint,'Schema::DB::Constraint') ? $Constraint->Name : $Constraint;
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125 $Constraint = $this->{$Constraints}->{$cn} or die new Exception('The specified constraint doesn\'t exists',$cn);
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126
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127 if (UNIVERSAL::isa($Constraint,'Schema::DB::Constraint::PrimaryKey')) {
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128 not scalar keys %{$this->{$PrimaryKey}->ConnectedFK} or die new Exception('Can\'t remove Primary Key unless some foreign keys referenses it');
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129
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130 delete $this->{$PrimaryKey};
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131 }
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132 $Constraint->Dispose;
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133 delete $this->{$Constraints}->{$cn};
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134 return $cn;
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135 }
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136
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137 sub GetColumnConstraints {
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138 my ($this,@Columns) = @_;
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139
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140 my @cn = map { UNIVERSAL::isa($_ ,'Schema::DB::Column') ? $_ ->Name : $_ } @Columns;
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141 exists $this->{$ColumnsByName}->{$_} or die new Exception('The specified column isn\'t found',$_) foreach @cn;
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142
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143 return grep {$_->HasColumn(@cn)} values %{$this->{$Constraints}};
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144 }
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145
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146 sub SetPrimaryKey {
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147 my ($this,@ColumnList) = @_;
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148
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149 $this->AddConstraint(new Schema::DB::Constraint::PrimaryKey(Name => $this->{$Name}.'_PK', Table => $this,Columns => \@ColumnList));
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150 }
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151
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152 sub LinkTo {
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153 my ($this,$table,@ColumnList) = @_;
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154 $table->PrimaryKey or die new Exception('The referenced table must have a primary key');
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155 my $constraintName = $this->{$Name}.'_'.$table->Name.'_FK_'.join('_',map {ref $_ ? $_->Name : $_} @ColumnList);
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156 $this->AddConstraint(new Schema::DB::Constraint::ForeignKey(Name => $constraintName, Table => $this,Columns => \@ColumnList, ReferencedTable => $table, ReferencedColumns => scalar($table->PrimaryKey->Columns)));
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157 }
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158
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159 sub Dispose {
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160 my ($this) = @_;
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161
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162 $_->Dispose() foreach values %{$this->{$Constraints}};
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163
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164 undef %{$this};
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165 $this->SUPER::Dispose();
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166 }
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167
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168 1;