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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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* ConstraintExpression: |
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* KEY [index_name] [index_type] (index_col_name,...) |
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* | PRIMARY KEY [index_type] (index_col_name,...) |
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* | UNIQUE KEY [index_name] [index_type] (index_col_name,...) |
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* | FOREIGN KEY [index_name] (index_col_name,...) ReferenceExpression |
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* index_type: |
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* USING {BTREE | HASH} |
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* |
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* @method \Wandu\Database\Query\Expression\ConstraintExpression using(int $indexType) |
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*/ |
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class ConstraintExpression implements ExpressionInterface |
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{ |
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use Attributes; |
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const KEY_TYPE_NONE = 0; |
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const KEY_TYPE_PRIMARY = 1; |
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const KEY_TYPE_UNIQUE = 2; |
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const KEY_TYPE_FOREIGN = 3; |
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const INDEX_TYPE_NONE = 0; // but maybe use B-Tree |
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const INDEX_TYPE_BTREE = 1; |
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const INDEX_TYPE_HASH = 2; |
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/** @var array */ |
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protected $columns; |
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/** @var string */ |
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protected $name; |
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/** @var \Wandu\Database\Query\Expression\ReferenceExpression */ |
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protected $reference; |
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/** |
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* @param array $columns |
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* @param string $name |
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* @param array $attributes |
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*/ |
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public function __construct(array $columns, $name = null, array $attributes = []) |
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{ |
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$this->columns = $columns; |
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$this->name = $name; |
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$this->attributes = $attributes; |
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} |
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/** |
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* @param string $table |
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* @param string|array $column |
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* @return \Wandu\Database\Query\Expression\ReferenceExpression |
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*/ |
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public function reference($table, $column) |
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{ |
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return $this->reference = new ReferenceExpression($table, is_array($column) ? $column : [$column]); |
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} |
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/** |
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* @example |
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* KEY [index_name] [index_type] (index_col_name,...) |
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* PRIMARY KEY [index_type] (index_col_name,...) |
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* UNIQUE KEY [index_name] [index_type] (index_col_name,...) |
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* FOREIGN KEY [index_name] (index_col_name,...) ReferenceExpression |
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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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$stringToReturn = ''; |
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$keyType = isset($this->attributes['key_type']) ? $this->attributes['key_type'] : static::KEY_TYPE_NONE; |
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switch ($keyType) { |
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case static::KEY_TYPE_PRIMARY: |
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$stringToReturn .= 'PRIMARY '; break; |
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case static::KEY_TYPE_UNIQUE: |
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$stringToReturn .= 'UNIQUE '; break; |
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case static::KEY_TYPE_FOREIGN: |
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$stringToReturn .= 'FOREIGN '; break; |
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default: |
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$keyType = static::KEY_TYPE_NONE; // normalize |
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} |
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$stringToReturn .= 'KEY'; |
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if ($keyType !== static::KEY_TYPE_PRIMARY && $this->name) { |
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$stringToReturn .= " `{$this->name}`"; |
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} |
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if ($keyType !== static::KEY_TYPE_FOREIGN && isset($this->attributes['using'])) { |
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switch ($this->attributes['using']) { |
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case static::INDEX_TYPE_BTREE: |
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$stringToReturn .= ' USING BTREE'; break; |
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case static::INDEX_TYPE_HASH: |
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$stringToReturn .= ' USING HASH'; break; |
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} |
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} |
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$stringToReturn .= ' (' . Helper::arrayImplode(', ', $this->columns, '`', '`') .')'; |
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if ($keyType === static::KEY_TYPE_FOREIGN && isset($this->reference)) { |
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$referenceString = $this->reference->toSql(); |
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if ($referenceString) { |
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$stringToReturn .= " {$referenceString}"; |
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} |
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} |
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return $stringToReturn; |
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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.