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49
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1 package Schema::DB::Constraint::ForeignKey;
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2 use strict;
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3 use Common;
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4 use base qw(Schema::DB::Constraint);
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5
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6 BEGIN {
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7 DeclareProperty ReferencedPrimaryKey => ACCESS_READ;
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8 DeclareProperty OnDelete => ACCESS_READ;
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9 DeclareProperty OnUpdate => ACCESS_READ;
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10 }
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11
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12 sub CTOR {
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13 my ($this,%args) = @_;
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14
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15 $this->SUPER::CTOR(%args);
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16
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17
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18 die new Eexception("Referenced table must be an instance of a table object") if not UNIVERSAL::isa($args{'ReferencedTable'},'Schema::DB::Table');
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19
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20 die new Exception("Referenced columns must be a not empty list of columns") if not UNIVERSAL::isa($args{'ReferencedColumns'},'ARRAY') or not scalar(@{$args{'ReferencedColumns'}});
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21
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22 my @ReferencedColumns = map {Schema::DB::Constraint::ResolveColumn($args{'ReferencedTable'},$_)} @{$args{'ReferencedColumns'}};
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23 my $ForeingPK = $args{'ReferencedTable'}->PrimaryKey or die new Exception('The referenced table doesn\'t have a primary key');
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24
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25 scalar (@ReferencedColumns) == scalar(@{$this->Columns}) or die new Exception('A foreing key columns doesn\'t match refenced columns');
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26 my @ColumnsCopy = @ReferencedColumns;
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27
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28 die new Exception('A foreing key columns doesn\'t match refenced columns') if grep { not $_->Type->isSame((shift @ColumnsCopy)->Type)} $this->Columns;
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29
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30 @ColumnsCopy = @ReferencedColumns;
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31 die new Exception('The foreign key must match to the primary key of the referenced table',$this->Name) if grep { not $_->Type->isSame(shift(@ColumnsCopy)->Type)} $ForeingPK->Columns;
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32
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33 $this->{$ReferencedPrimaryKey} = $ForeingPK;
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34
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35 $ForeingPK->ConnectFK($this);
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36 }
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37
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38 sub Dispose {
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39 my ($this) = @_;
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40
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41 $this->{$ReferencedPrimaryKey}->DisconnectFK($this) if not $this->{$ReferencedPrimaryKey}->isa('Object::Disposed');
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42 delete $this->{$ReferencedPrimaryKey};
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43
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44 $this->SUPER::Dispose;
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45 }
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46
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47 sub isSame {
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48 my ($this,$other) = @_;
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49
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50 uc $this->OnDelete eq uc $other->OnDelete or return 0;
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51 uc $this->OnUpdate eq uc $other->OnUpdate or return 0;
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52
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53 return $this->SUPER::isSame($other);
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54 }
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55
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56
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57
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58 1;
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