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<?php |
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namespace Wandu\Database\Query\Expression; |
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use Wandu\Database\Contracts\ExpressionInterface; |
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use Wandu\Database\Support\Attributes; |
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use Wandu\Database\Support\Helper; |
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/** |
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* @see http://dev.mysql.com/doc/refman/5.7/en/create-table.html |
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* |
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* ReferenceExpression: |
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* REFERENCES tbl_name (index_col_name,...) |
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* [ON DELETE reference_option] |
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* [ON UPDATE reference_option] |
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* reference_option: |
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* RESTRICT | CASCADE | SET NULL | NO ACTION |
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* |
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* @method \Wandu\Database\Query\Expression\ReferenceExpression onUpdate(int $option) |
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* @method \Wandu\Database\Query\Expression\ReferenceExpression onDelete(int $option) |
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*/ |
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class ReferenceExpression implements ExpressionInterface |
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{ |
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use Attributes; |
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const OPTION_NO_ACTION = 0; |
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const OPTION_RESTRICT = 1; |
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const OPTION_CASCADE = 2; |
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const OPTION_SET_NULL = 3; |
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/** @var string */ |
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protected $table; |
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/** @var array */ |
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protected $columns; |
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/** |
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* @param string $table |
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* @param array $columns |
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* @param array $attributes |
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*/ |
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public function __construct($table, array $columns, array $attributes = []) |
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{ |
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$this->table = $table; |
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$this->columns = $columns; |
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$this->attributes = $attributes; |
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2 |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function toSql() |
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{ |
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$sqlToReturn = "REFERENCES `{$this->table}`"; |
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$sqlToReturn .= '(' . Helper::arrayImplode(', ', $this->columns, '`', '`') . ')'; |
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if (isset($this->attributes['on_delete'])) { |
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switch ($this->attributes['on_delete']) { |
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case static::OPTION_NO_ACTION: |
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$sqlToReturn .= ' ON DELETE NO ACTION'; break; |
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case static::OPTION_RESTRICT: |
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$sqlToReturn .= ' ON DELETE RESTRICT'; break; |
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1 |
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case static::OPTION_CASCADE: |
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$sqlToReturn .= ' ON DELETE CASCADE'; break; |
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1 |
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case static::OPTION_SET_NULL: |
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1 |
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$sqlToReturn .= ' ON DELETE SET NULL'; break; |
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} |
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} |
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if (isset($this->attributes['on_update'])) { |
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switch ($this->attributes['on_update']) { |
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case static::OPTION_NO_ACTION: |
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$sqlToReturn .= ' ON UPDATE NO ACTION'; break; |
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1 |
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case static::OPTION_RESTRICT: |
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$sqlToReturn .= ' ON UPDATE RESTRICT'; break; |
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case static::OPTION_CASCADE: |
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$sqlToReturn .= ' ON UPDATE CASCADE'; break; |
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case static::OPTION_SET_NULL: |
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$sqlToReturn .= ' ON UPDATE SET NULL'; break; |
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} |
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} |
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return $sqlToReturn; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getBindings() |
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{ |
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return []; |
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} |
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} |
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As per the PSR-2 coding standard, the
break(or other terminating) statement must be on a line of its own.To learn more about the PSR-2 coding standard, please refer to the PHP-Fig.