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<?php |
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/** |
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* Created by PhpStorm. |
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* User: jg |
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* Date: 21/06/16 |
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* Time: 12:01 |
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*/ |
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namespace ByJG\MicroOrm; |
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class Query |
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{ |
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protected $fields = []; |
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protected $table = ""; |
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protected $where = []; |
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protected $groupBy = []; |
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protected $orderBy = []; |
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protected $join = []; |
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protected $forUpdate = false; |
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/** |
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* Example: |
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* $query->fields(['name', 'price']); |
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* |
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* @param array $fields |
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* @return $this |
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*/ |
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public function fields(array $fields) |
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{ |
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$this->fields = array_merge($this->fields, $fields); |
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return $this; |
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} |
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/** |
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* Example |
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* $query->table('product'); |
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* |
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* @param string $table |
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* @return $this |
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*/ |
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public function table($table) |
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{ |
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$this->table = $table; |
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return $this; |
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} |
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/** |
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* Example: |
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* $query->join('sales', 'product.id = sales.id'); |
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* |
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* @param string $table |
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* @param string $filter |
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* @return $this |
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*/ |
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public function join($table, $filter) |
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{ |
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$this->join[] = [ 'table'=>$table, 'filter'=>$filter, 'type' => 'INNER']; |
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return $this; |
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} |
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/** |
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* Example: |
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* $query->join('sales', 'product.id = sales.id'); |
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* |
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* @param string $table |
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* @param string $filter |
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* @return $this |
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*/ |
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public function leftJoin($table, $filter) |
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{ |
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$this->join[] = [ 'table'=>$table, 'filter'=>$filter, 'type' => 'LEFT']; |
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return $this; |
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} |
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/** |
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* Example: |
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* $query->filter('price > [[amount]]', [ 'amount' => 1000] ); |
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* |
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* @param string $filter |
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* @param array $params |
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* @return $this |
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*/ |
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public function where($filter, array $params = []) |
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{ |
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$this->where[] = [ 'filter' => $filter, 'params' => $params ]; |
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return $this; |
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} |
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/** |
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* Example: |
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* $query->groupBy(['name']); |
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* |
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* @param array $fields |
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* @return $this |
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*/ |
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public function groupBy(array $fields) |
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{ |
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$this->groupBy = array_merge($this->groupBy, $fields); |
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return $this; |
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} |
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/** |
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* Example: |
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* $query->orderBy(['price desc']); |
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* |
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* @param array $fields |
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* @return $this |
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*/ |
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public function orderBy(array $fields) |
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{ |
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$this->orderBy = array_merge($this->orderBy, $fields); |
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return $this; |
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} |
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public function forUpdate() |
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{ |
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$this->forUpdate = true; |
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return $this; |
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} |
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protected function getFields() |
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{ |
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if (empty($this->fields)) { |
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return ' * '; |
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} |
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return ' ' . implode(', ', $this->fields) . ' '; |
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} |
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protected function getJoin() |
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{ |
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$join = $this->table; |
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foreach ($this->join as $item) { |
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$join .= ' ' . $item['type'] . ' JOIN ' . $item['table'] . ' ON ' . $item['filter']; |
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} |
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return $join; |
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} |
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protected function getWhere() |
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{ |
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$where = []; |
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$params = []; |
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foreach ($this->where as $item) { |
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$where[] = $item['filter']; |
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$params = array_merge($params, $item['params']); |
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} |
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if (empty($where)) { |
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return null; |
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} |
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return [ implode(' AND ', $where), $params ]; |
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} |
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/** |
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* @return array |
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*/ |
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public function getSelect() |
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{ |
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$sql = "SELECT " . |
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$this->getFields() . |
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"FROM " . $this->getJoin(); |
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$where = $this->getWhere(); |
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$params = null; |
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if (!is_null($where)) { |
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$sql .= ' WHERE ' . $where[0]; |
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$params = $where[1]; |
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} |
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if (!empty($this->groupBy)) { |
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$sql .= ' GROUP BY ' . implode(', ', $this->groupBy); |
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} |
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if (!empty($this->orderBy)) { |
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$sql .= ' ORDER BY ' . implode(', ', $this->orderBy); |
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} |
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if ($this->forUpdate) { |
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$sql .= ' FOR UPDATE '; |
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} |
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return [ 'sql' => $sql, 'params' => $params ]; |
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} |
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/** |
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* @return string |
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* @throws \Exception |
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*/ |
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public function getInsert() |
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{ |
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if (empty($this->fields)) { |
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throw new \Exception('You must specifiy the fields for insert'); |
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} |
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$sql = 'INSERT INTO ' |
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. $this->table |
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. '( ' . implode(', ', $this->fields) . ' ) ' |
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. ' values ' |
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. '( [[' . implode(']], [[', $this->fields) . ']] ) '; |
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return $sql; |
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} |
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/** |
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* @return array |
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* @throws \Exception |
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*/ |
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public function getUpdate() |
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{ |
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if (empty($this->fields)) { |
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throw new \Exception('You must specifiy the fields for insert'); |
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} |
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$fields = []; |
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foreach ($this->fields as $field) { |
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$fields[] = "$field = [[$field]] "; |
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} |
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$where = $this->getWhere(); |
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if (is_null($where)) { |
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throw new \Exception('You must specifiy a where clause'); |
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} |
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$sql = 'UPDATE ' . $this->table . ' SET ' |
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. implode(', ', $fields) |
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. ' WHERE ' . $where[0]; |
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return [ 'sql' => $sql, 'params' => $where[1] ]; |
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} |
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/** |
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* @return array |
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* @throws \Exception |
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*/ |
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public function getDelete() |
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{ |
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$where = $this->getWhere(); |
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if (is_null($where)) { |
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throw new \Exception('You must specifiy a where clause'); |
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} |
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$sql = 'DELETE FROM ' . $this->table |
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. ' WHERE ' . $where[0]; |
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return [ 'sql' => $sql, 'params' => $where[1] ]; |
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} |
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} |
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