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<?php |
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/** |
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* QueryBuilder |
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* Clase encargada de generar consultas usando métodos de apoyo |
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* @author nelson rojas |
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*/ |
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class QueryBuilder { |
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protected $_table = ''; |
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protected $_columns = ''; |
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protected $_conditions = ''; |
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protected $_joins = ''; |
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protected $_limit = ''; |
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protected $_group = ''; |
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protected $_having = ''; |
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protected $_orderBy = ''; |
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/** |
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* constructor |
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* @params table |
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*/ |
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public function __construct($tableName) { |
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$this->_table = $tableName; |
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return $this; |
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} |
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/** |
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* columns |
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* @params columns |
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*/ |
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public function columns($columns) { |
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$this->_columns = $columns; |
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return $this; |
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} |
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/** |
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* where |
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* @params condition |
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* @params operator |
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*/ |
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public function where($condition) { |
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$operator = 'AND'; |
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if (empty($this->_conditions)) { |
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$this->_conditions = $condition; |
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} else { |
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$this->_conditions .= $operator . ' ' . $condition; |
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} |
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$this->_conditions .= ' '; // extra space after condition |
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return $this; |
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} |
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/** |
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* orWhere |
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* @params condition |
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* @params operator |
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*/ |
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public function orWhere($condition) { |
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$operator = 'OR'; |
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if (empty($this->_conditions)) { |
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$this->_conditions = $condition; |
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} else { |
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$this->_conditions .= $operator . ' ' . $condition; |
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} |
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$this->_conditions .= ' '; // extra space after condition |
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return $this; |
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} |
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/** |
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* join |
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* @params join |
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*/ |
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public function join($join) { |
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$this->_joins .= $join . ' '; |
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return $this; |
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} |
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/** |
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* limit |
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* @params limit |
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*/ |
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public function limit($limit) { |
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$this->_limit = 'LIMIT ' . $limit; |
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return $this; |
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} |
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/** |
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* group |
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* @params group |
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*/ |
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public function group($group) { |
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$this->_group = ' GROUP BY ' . $group; |
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return $this; |
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} |
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/** |
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* having |
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* @params having |
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*/ |
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public function having($having) { |
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$this->_having = ' HAVING ' . $having; |
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return $this; |
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} |
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/** |
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* orderBy |
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* @params orderBy |
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*/ |
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public function orderBy($orderBy) { |
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$this->_orderBy = ' ORDER BY ' . $orderBy; |
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return $this; |
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} |
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/** |
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* generar string con la consulta a partir de los métodos |
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* cargados |
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*/ |
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public function __toString() { |
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$sql = 'SELECT ' . (empty($this->_columns) ? '*' : $this->_columns) . |
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' ' . 'FROM ' . $this->_table; |
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$check_for = [ |
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'_joins', |
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'_conditions', |
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'_group', |
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'_having', |
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'_limit', |
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'_orderBy' |
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]; |
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if (!empty($this->_conditions)) { |
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$this->_conditions = 'WHERE ' . $this->_conditions; |
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} |
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foreach ($check_for as $element) : |
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if (!empty(trim($this->$element))) : |
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$sql .= ' ' . $this->$element . ' '; |
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endif; |
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endforeach; |
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return $sql; |
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} |
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/** |
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* clear |
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*/ |
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private function clear() { |
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$clear_in = [ |
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'_table', |
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'_joins', |
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'_conditions', |
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'_group', |
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'_having', |
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'_limit', |
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'_orderBy' |
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]; |
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foreach ($clear_in as $elem) : |
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$this->$elem = ''; |
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endforeach |
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; |
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} |
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/** |
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166
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* destruct |
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167
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*/ |
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168
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function __destruct() { |
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$this->clear(); |
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} |
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172
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} |
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173
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nelsonrojasn /
pin
Adding explicit visibility (
private,protected, orpublic) is generally recommend to communicate to other developers how, and from where this method is intended to be used.