Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like DbInformix often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use DbInformix, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 29 | class DbInformix extends DbBase implements DbBaseInterface |
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| 30 | { |
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| 31 | |||
| 32 | /** |
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| 33 | * Resource de la Conexion a Informix |
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| 34 | * |
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| 35 | * @var resource |
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| 36 | */ |
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| 37 | public $id_connection; |
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| 38 | /** |
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| 39 | * Ultimo Resultado de una Query |
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| 40 | * |
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| 41 | * @var resource |
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| 42 | */ |
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| 43 | public $last_result_query; |
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| 44 | /** |
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| 45 | * Ultima sentencia SQL enviada a Informix |
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| 46 | * |
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| 47 | * @var string |
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| 48 | */ |
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| 49 | protected $last_query; |
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| 50 | /** |
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| 51 | * Ultimo error generado por Informix |
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| 52 | * |
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| 53 | * @var string |
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| 54 | */ |
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| 55 | public $last_error; |
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| 56 | /** |
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| 57 | * Indica si query devuelve registros o no; |
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| 58 | * |
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| 59 | * @var boolean |
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| 60 | */ |
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| 61 | private $return_rows = true; |
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| 62 | /** |
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| 63 | * Emula un limit a nivel de Adaptador para Informix |
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| 64 | * |
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| 65 | * @var int |
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| 66 | */ |
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| 67 | private $limit = -1; |
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| 68 | /** |
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| 69 | * Numero de limit actual para fetch_array |
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| 70 | * |
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| 71 | * @var int |
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| 72 | */ |
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| 73 | private $actual_limit = 0; |
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| 74 | |||
| 75 | /** |
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| 76 | * Resultado de Array Asociativo |
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| 77 | * |
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| 78 | */ |
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| 79 | const DB_ASSOC = 1; |
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| 80 | |||
| 81 | /** |
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| 82 | * Resultado de Array Asociativo y Numerico |
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| 83 | * |
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| 84 | */ |
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| 85 | const DB_BOTH = 2; |
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| 86 | |||
| 87 | /** |
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| 88 | * Resultado de Array Numerico |
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| 89 | * |
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| 90 | */ |
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| 91 | const DB_NUM = 3; |
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| 92 | |||
| 93 | /** |
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| 94 | * Tipo de Dato Integer |
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| 95 | * |
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| 96 | */ |
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| 97 | const TYPE_INTEGER = 'INTEGER'; |
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| 98 | |||
| 99 | /** |
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| 100 | * Tipo de Dato Date |
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| 101 | * |
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| 102 | */ |
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| 103 | const TYPE_DATE = 'DATE'; |
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| 104 | |||
| 105 | /** |
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| 106 | * Tipo de Dato Varchar |
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| 107 | * |
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| 108 | */ |
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| 109 | const TYPE_VARCHAR = 'VARCHAR'; |
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| 110 | |||
| 111 | /** |
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| 112 | * Tipo de Dato Decimal |
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| 113 | * |
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| 114 | */ |
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| 115 | const TYPE_DECIMAL = 'DECIMAL'; |
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| 116 | |||
| 117 | /** |
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| 118 | * Tipo de Dato Datetime |
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| 119 | * |
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| 120 | */ |
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| 121 | const TYPE_DATETIME = 'DATETIME'; |
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| 122 | |||
| 123 | /** |
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| 124 | * Tipo de Dato Char |
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| 125 | * |
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| 126 | */ |
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| 127 | const TYPE_CHAR = 'CHAR'; |
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| 128 | |||
| 129 | /** |
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| 130 | * Hace una conexión a la base de datos de Informix |
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| 131 | * |
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| 132 | * @param array $config |
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| 133 | * @return bool |
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| 134 | */ |
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| 135 | public function connect($config) |
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| 136 | { |
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| 137 | if (!extension_loaded('informix')) { |
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| 138 | throw new KumbiaException('Debe cargar la extensión de PHP llamada php_ifx'); |
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| 139 | } |
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| 140 | |||
| 141 | if ($this->id_connection = ifx_connect("{$config['name']}@{$config['host']}", $config['username'], $config['password'])) { |
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| 142 | return true; |
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| 143 | } else { |
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| 144 | throw new KumbiaException($this->error()); |
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| 145 | } |
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| 146 | } |
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| 147 | |||
| 148 | /** |
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| 149 | * Efectua operaciones SQL sobre la base de datos |
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| 150 | * |
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| 151 | * @param string $sql_query |
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| 152 | * @return resource or false |
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| 153 | */ |
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| 154 | public function query($sql_query) |
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| 155 | { |
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| 156 | $this->debug($sql_query); |
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| 157 | if ($this->logger) { |
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| 158 | Logger::debug($sql_query); |
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| 159 | } |
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| 160 | |||
| 161 | $this->last_query = $sql_query; |
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| 162 | |||
| 163 | // Los resultados que devuelven filas usan cursores tipo SCROLL |
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| 164 | if ($this->return_rows) { |
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| 165 | $result_query = ifx_query($sql_query, $this->id_connection, IFX_HOLD); |
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| 166 | } else { |
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| 167 | $result_query = ifx_query($sql_query, $this->id_connection); |
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| 168 | } |
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| 169 | $this->set_return_rows(true); |
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| 170 | if ($result_query === false) { |
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| 171 | throw new KumbiaException($this->error(" al ejecutar <em>\"$sql_query\"</em>")); |
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| 172 | } |
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| 173 | $this->last_result_query = $result_query; |
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| 174 | return $result_query; |
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| 175 | } |
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| 176 | |||
| 177 | /** |
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| 178 | * Cierra la Conexión al Motor de Base de datos |
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| 179 | * |
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| 180 | */ |
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| 181 | public function close() |
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| 182 | { |
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| 183 | if ($this->id_connection) { |
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| 184 | return ifx_close($this->id_connection); |
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| 185 | } |
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| 186 | return false; |
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| 187 | } |
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| 188 | |||
| 189 | /** |
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| 190 | * Devuelve fila por fila el contenido de un select |
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| 191 | * |
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| 192 | * @param resource $result_query |
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| 193 | * @param int $opt |
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| 194 | * @return array |
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| 195 | */ |
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| 196 | public function fetch_array($result_query=NULL, $opt=2) |
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| 197 | { |
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| 198 | |||
| 199 | if (!$result_query) { |
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| 200 | $result_query = $this->last_result_query; |
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| 201 | if (!$result_query) { |
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| 202 | return false; |
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| 203 | } |
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| 204 | } |
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| 205 | $fetch = ifx_fetch_row($result_query, $opt); |
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| 206 | |||
| 207 | // Informix no soporta limit por eso hay que emularlo |
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| 208 | if ($this->limit != -1) { |
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| 209 | if ($this->actual_limit >= $this->limit) { |
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| 210 | $this->limit = -1; |
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| 211 | $this->actual_limit = 0; |
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| 212 | return false; |
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| 213 | } else { |
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| 214 | $this->actual_limit++; |
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| 215 | if ($this->actual_limit == $this->limit) { |
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| 216 | $this->limit = -1; |
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| 217 | $this->actual_limit = 0; |
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| 218 | } |
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| 219 | } |
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| 220 | } |
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| 221 | |||
| 222 | // Informix no soporta fetch numerico, solo asociativo |
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| 223 | if (!is_array($fetch) || ($opt == self::DB_ASSOC)) { |
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| 224 | return $fetch; |
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| 225 | } |
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| 226 | if ($opt == self::DB_BOTH) { |
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| 227 | $result = array(); |
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| 228 | $i = 0; |
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| 229 | foreach ($fetch as $key => $value) { |
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| 230 | $result[$key] = $value; |
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| 231 | $result[$i++] = $value; |
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| 232 | } |
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| 233 | return $result; |
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| 234 | } |
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| 235 | if ($opt == self::DB_NUM) { |
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| 236 | return array_values($fetch); |
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| 237 | } |
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| 238 | } |
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| 239 | |||
| 240 | /** |
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| 241 | * Constructor de la Clase |
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| 242 | * |
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| 243 | * @param array $config |
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| 244 | */ |
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| 245 | public function __construct($config) |
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| 246 | { |
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| 247 | $this->connect($config); |
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| 248 | } |
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| 249 | |||
| 250 | /** |
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| 251 | * Devuelve el numero de filas de un select |
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| 252 | * |
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| 253 | * @param resource $result_query |
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| 254 | * @return int |
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| 255 | */ |
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| 256 | public function num_rows($result_query=NULL) |
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| 257 | { |
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| 258 | |||
| 259 | if (!$result_query) { |
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| 260 | $result_query = $this->last_result_query; |
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| 261 | if (!$result_query) { |
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| 262 | return false; |
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| 263 | } |
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| 264 | } |
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| 265 | if (($number_rows = ifx_num_rows($result_query)) !== false) { |
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| 266 | |||
| 267 | // Emula un limit a nivel de adaptador |
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| 268 | if ($this->limit == -1) { |
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| 269 | return $number_rows; |
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| 270 | } else { |
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| 271 | return $this->limit < $number_rows ? $this->limit : $number_rows; |
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| 272 | } |
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| 273 | } else { |
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| 274 | throw new KumbiaException($this->error()); |
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| 275 | } |
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| 276 | } |
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| 277 | |||
| 278 | /** |
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| 279 | * Devuelve el nombre de un campo en el resultado de un select |
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| 280 | * |
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| 281 | * @param int $number |
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| 282 | * @param resource $result_query |
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| 283 | * @return string |
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| 284 | */ |
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| 285 | public function field_name($number, $result_query=NULL) |
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| 286 | { |
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| 287 | |||
| 288 | if (!$result_query) { |
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| 289 | $result_query = $this->last_result_query; |
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| 290 | if (!$result_query) { |
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| 291 | return false; |
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| 292 | } |
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| 293 | } |
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| 294 | $fields = ifx_fieldproperties($result_query); |
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| 295 | if (!is_array($fields)) { |
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| 296 | return false; |
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| 297 | } |
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| 298 | |||
| 299 | $fields = array_keys($fields); |
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| 300 | return $fields[$number]; |
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| 301 | } |
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| 302 | |||
| 303 | /** |
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| 304 | * Se Mueve al resultado indicado por $number en un select |
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| 305 | * Hay problemas con este metodo hay problemas con curesores IFX_SCROLL |
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| 306 | * |
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| 307 | * @param int $number |
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| 308 | * @param resource $result_query |
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| 309 | * @return boolean |
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| 310 | */ |
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| 311 | public function data_seek($number, $result_query=NULL) |
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| 312 | { |
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| 313 | if (!$result_query) { |
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| 314 | $result_query = $this->last_result_query; |
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| 315 | if (!$result_query) { |
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| 316 | return false; |
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| 317 | } |
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| 318 | } |
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| 319 | if (($success = ifx_fetch_row($result_query, $number)) !== false) { |
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| 320 | return $success; |
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| 321 | } else { |
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| 322 | throw new KumbiaException($this->error()); |
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| 323 | } |
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| 324 | } |
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| 325 | |||
| 326 | /** |
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| 327 | * Numero de Filas afectadas en un insert, update o delete |
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| 328 | * |
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| 329 | * @param resource $result_query |
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| 330 | * @return int |
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| 331 | */ |
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| 332 | public function affected_rows($result_query=NULL) |
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| 333 | { |
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| 334 | if (!$result_query) { |
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| 335 | $result_query = $this->last_result_query; |
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| 336 | if (!$result_query) { |
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| 337 | return false; |
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| 338 | } |
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| 339 | } |
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| 340 | if (($numberRows = ifx_affected_rows($result_query)) !== false) { |
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| 341 | return $numberRows; |
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| 342 | } else { |
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| 343 | throw new KumbiaException($this->error()); |
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| 344 | } |
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| 345 | } |
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| 346 | |||
| 347 | /** |
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| 348 | * Devuelve el error de Informix |
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| 349 | * |
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| 350 | * @return string |
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| 351 | */ |
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| 352 | public function error($err='') |
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| 353 | { |
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| 354 | if (!$this->id_connection) { |
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| 355 | $this->last_error = ifx_errormsg() ? ifx_errormsg() : "[Error Desconocido en Informix: $err]"; |
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| 356 | if ($this->logger) { |
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| 357 | Logger::error($this->last_error); |
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| 358 | } |
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| 359 | return $this->last_error; |
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| 360 | } |
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| 361 | $this->last_error = ifx_errormsg($this->id_connection) ? ifx_errormsg($this->id_connection) : "[Error Desconocido en Informix: $err]"; |
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| 362 | $this->last_error.= $err; |
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| 363 | if ($this->logger) { |
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| 364 | Logger::error($this->last_error); |
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| 365 | } |
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| 366 | return $this->last_error; |
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| 367 | } |
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| 368 | |||
| 369 | /** |
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| 370 | * Devuelve el no error de Informix |
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| 371 | * |
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| 372 | * @return int |
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| 373 | */ |
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| 374 | public function no_error() |
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| 375 | { |
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| 376 | return ifx_error(); |
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| 377 | } |
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| 378 | |||
| 379 | /** |
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| 380 | * Devuelve el ultimo id autonumerico generado en la BD |
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| 381 | * |
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| 382 | * @return int |
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| 383 | */ |
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| 384 | public function last_insert_id($table='', $primary_key='') |
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| 385 | { |
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| 386 | $sqlca = ifx_getsqlca($this->last_result_query); |
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| 387 | return $sqlca["sqlerrd1"]; |
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| 388 | } |
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| 389 | |||
| 390 | /** |
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| 391 | * Verifica si una tabla existe o no |
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| 392 | * |
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| 393 | * @param string $table |
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| 394 | * @return integer |
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| 395 | */ |
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| 396 | public function table_exists($table, $schema='') |
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| 397 | { |
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| 398 | // Informix no soporta schemas |
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| 399 | $table = addslashes("$table"); |
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| 400 | $num = $this->fetch_one("SELECT COUNT(*) FROM systables WHERE tabname = '$table'"); |
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| 401 | return (int) $num[0]; |
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| 402 | } |
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| 403 | |||
| 404 | /** |
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| 405 | * Devuelve un LIMIT valido para un SELECT del RBDM |
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| 406 | * |
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| 407 | * @param string $sql |
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| 408 | * @return string |
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| 409 | */ |
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| 410 | public function limit($sql){ |
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| 411 | /** |
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| 412 | * No esta soportado por Informix |
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| 413 | */ |
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| 414 | return "$sql \n"; |
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| 415 | } |
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| 416 | |||
| 417 | |||
| 418 | /** |
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| 419 | * Borra una tabla de la base de datos |
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| 420 | * |
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| 421 | * @param string $table |
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| 422 | * @return boolean |
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| 423 | */ |
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| 424 | public function drop_table($table, $if_exists=true) |
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| 425 | { |
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| 426 | if ($if_exists) { |
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| 427 | if ($this->table_exists($table)) { |
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| 428 | $this->set_return_rows(false); |
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| 429 | return $this->query("DROP TABLE $table"); |
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| 430 | } else { |
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| 431 | return true; |
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| 432 | } |
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| 433 | } else { |
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| 434 | $this->set_return_rows(false); |
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| 435 | return $this->query("DROP TABLE $table"); |
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| 436 | } |
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| 437 | } |
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| 438 | |||
| 439 | /** |
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| 440 | * Crea una tabla utilizando SQL nativo del RDBM |
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| 441 | * |
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| 442 | * TODO: |
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| 443 | * - Falta que el parametro index funcione. Este debe listar indices compuestos multipes y unicos |
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| 444 | * - Agregar el tipo de tabla que debe usarse (Informix) |
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| 445 | * - Soporte para campos autonumericos |
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| 446 | * - Soporte para llaves foraneas |
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| 447 | * |
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| 448 | * @param string $table |
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| 449 | * @param array $definition |
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| 450 | * @return resource |
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| 451 | */ |
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| 452 | public function create_table($table, $definition, $index=array()) |
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| 453 | { |
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| 454 | $create_sql = "CREATE TABLE $table ("; |
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| 455 | if (!is_array($definition)) { |
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| 456 | throw new KumbiaException("Definición invalida para crear la tabla '$table'"); |
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| 457 | } |
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| 458 | $create_lines = array(); |
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| 459 | $index = array(); |
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| 460 | $unique_index = array(); |
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| 461 | $primary = array(); |
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| 462 | //$not_null = ""; |
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| 463 | //$size = ""; |
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| 464 | foreach ($definition as $field => $field_def) { |
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| 465 | if (isset($field_def['not_null'])) { |
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| 466 | $not_null = $field_def['not_null'] ? 'NOT NULL' : ''; |
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| 467 | } else { |
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| 468 | $not_null = ""; |
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| 469 | } |
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| 470 | if (isset($field_def['size'])) { |
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| 471 | $size = $field_def['size'] ? '(' . $field_def['size'] . ')' : ''; |
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| 472 | } else { |
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| 473 | $size = ""; |
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| 474 | } |
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| 475 | if (isset($field_def['index'])) { |
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| 476 | if ($field_def['index']) { |
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| 477 | $index[] = "INDEX($field)"; |
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| 478 | } |
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| 479 | } |
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| 480 | if (isset($field_def['unique_index'])) { |
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| 481 | if ($field_def['unique_index']) { |
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| 482 | $index[] = "UNIQUE($field)"; |
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| 483 | } |
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| 484 | } |
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| 485 | if (isset($field_def['primary'])) { |
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| 486 | if ($field_def['primary']) { |
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| 487 | $primary[] = "$field"; |
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| 488 | } |
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| 489 | } |
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| 490 | if (isset($field_def['auto'])) { |
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| 491 | if ($field_def['auto']) { |
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| 492 | $field_def['type'] = "SERIAL"; |
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| 493 | } |
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| 494 | } |
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| 495 | if (isset($field_def['extra'])) { |
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| 496 | $extra = $field_def['extra']; |
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| 497 | } else { |
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| 498 | $extra = ""; |
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| 499 | } |
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| 500 | $create_lines[] = "$field " . $field_def['type'] . $size . ' ' . $not_null . ' ' . $extra; |
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| 501 | } |
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| 502 | $create_sql.= join(',', $create_lines); |
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| 503 | $last_lines = array(); |
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| 504 | if (count($primary)) { |
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| 505 | $last_lines[] = 'PRIMARY KEY(' . join(",", $primary) . ')'; |
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| 506 | } |
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| 507 | if (count($index)) { |
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| 508 | $last_lines[] = join(',', $index); |
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| 509 | } |
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| 510 | if (count($unique_index)) { |
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| 511 | $last_lines[] = join(',', $unique_index); |
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| 512 | } |
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| 513 | if (count($last_lines)) { |
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| 514 | $create_sql.= ',' . join(',', $last_lines) . ')'; |
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| 515 | } |
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| 516 | $this->set_return_rows(false); |
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| 517 | return $this->query($create_sql); |
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| 518 | } |
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| 519 | |||
| 520 | /** |
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| 521 | * Listar las tablas en la base de datos |
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| 522 | * |
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| 523 | * @return array |
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| 524 | */ |
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| 525 | public function list_tables() |
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| 526 | { |
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| 527 | return $this->fetch_all("SELECT tabname FROM systables WHERE tabtype = 'T' AND version <> 65537"); |
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| 528 | } |
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| 529 | |||
| 530 | /** |
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| 531 | * Listar los campos de una tabla |
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| 532 | * |
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| 533 | * @param string $table |
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| 534 | * @return array |
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| 535 | */ |
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| 536 | public function describe_table($table, $schema='') |
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| 537 | { |
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| 538 | |||
| 539 | // Informix no soporta schemas |
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| 540 | // TODO: No hay un metodo identificable para obtener llaves primarias |
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| 541 | // no nulos y tamaños reales de campos |
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| 542 | // Primary Key, Null |
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| 543 | $describe = $this->fetch_all("SELECT c.colname AS Field, c.coltype AS Type, |
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| 544 | 'YES' AS NULL FROM systables t, syscolumns c WHERE |
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| 545 | c.tabid = t.tabid AND t.tabname = '$table' ORDER BY c.colno"); |
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| 546 | $final_describe = array(); |
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| 547 | foreach ($describe as $field) { |
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| 548 | //Serial |
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| 549 | if ($field['field'] == 'id') { |
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| 550 | $field["key"] = 'PRI'; |
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| 551 | $field["null"] = 'NO'; |
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| 552 | } else { |
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| 553 | $field["key"] = ''; |
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| 554 | } |
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| 555 | if (substr($field['field'], -3) == '_id') { |
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| 556 | $field["null"] = 'NO'; |
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| 557 | } |
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| 558 | if ($field['type'] == 262) { |
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| 559 | $field['type'] = "serial"; |
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| 560 | } |
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| 561 | if ($field['type'] == 13) { |
||
| 562 | $field['type'] = "varchar"; |
||
| 563 | } |
||
| 564 | if ($field['type'] == 7) { |
||
| 565 | $field['type'] = "date"; |
||
| 566 | } |
||
| 567 | $final_describe[] = array( |
||
| 568 | "Field" => $field["field"], |
||
| 569 | "Type" => $field["type"], |
||
| 570 | "Null" => $field["null"], |
||
| 571 | "Key" => $field["key"] |
||
| 572 | ); |
||
| 573 | } |
||
| 574 | return $final_describe; |
||
| 575 | } |
||
| 576 | |||
| 577 | /** |
||
| 578 | * Realiza una inserción (Sobreescrito para indicar que no devuelve registros) |
||
| 579 | * |
||
| 580 | * @param string $table |
||
| 581 | * @param array $values |
||
| 582 | * @param array $fields |
||
| 583 | * @return boolean |
||
| 584 | */ |
||
| 585 | public function insert($table, $values, $fields=null) |
||
| 586 | { |
||
| 587 | $this->set_return_rows(false); |
||
| 588 | return parent::insert($table, $values, $fields); |
||
| 589 | } |
||
| 590 | |||
| 591 | /** |
||
| 592 | * Actualiza registros en una tabla |
||
| 593 | * |
||
| 594 | * @param string $table |
||
| 595 | * @param array $fields |
||
| 596 | * @param array $values |
||
| 597 | * @param string $where_condition |
||
| 598 | * @return boolean |
||
| 599 | */ |
||
| 600 | public function update($table, $fields, $values, $where_condition=null) |
||
| 601 | { |
||
| 602 | $this->set_return_rows(false); |
||
| 603 | return parent::update($table, $fields, $values, $where_condition); |
||
| 604 | } |
||
| 605 | |||
| 606 | /** |
||
| 607 | * Borra registros de una tabla! |
||
| 608 | * |
||
| 609 | * @param string $table |
||
| 610 | * @param string $where_condition |
||
| 611 | */ |
||
| 612 | public function delete($table, $where_condition) |
||
| 613 | { |
||
| 614 | $this->set_return_rows(false); |
||
| 615 | return parent::delete($table, $where_condition); |
||
| 616 | } |
||
| 617 | |||
| 618 | /** |
||
| 619 | * Indica internamente si el resultado obtenido es devuelve registros o no |
||
| 620 | * |
||
| 621 | * @param boolean $value |
||
| 622 | */ |
||
| 623 | public function set_return_rows($value=true) |
||
| 624 | { |
||
| 625 | $this->return_rows = $value; |
||
| 626 | } |
||
| 627 | |||
| 628 | /** |
||
| 629 | * Inicia una transacción si es posible |
||
| 630 | * |
||
| 631 | */ |
||
| 632 | public function begin() |
||
| 633 | { |
||
| 634 | $this->set_return_rows(false); |
||
| 635 | return $this->query("BEGIN WORK"); |
||
| 636 | } |
||
| 637 | |||
| 638 | /** |
||
| 639 | * Cancela una transacción si es posible |
||
| 640 | * |
||
| 641 | */ |
||
| 642 | public function rollback() |
||
| 643 | { |
||
| 644 | $this->set_return_rows(false); |
||
| 645 | return $this->query("ROLLBACK"); |
||
| 646 | } |
||
| 647 | |||
| 648 | /** |
||
| 649 | * Hace commit sobre una transacción si es posible |
||
| 650 | * |
||
| 651 | */ |
||
| 652 | public function commit() |
||
| 653 | { |
||
| 654 | $this->set_return_rows(false); |
||
| 655 | return $this->query("COMMIT"); |
||
| 656 | } |
||
| 657 | |||
| 658 | /** |
||
| 659 | * Devuelve la ultima sentencia sql ejecutada por el Adaptador |
||
| 660 | * |
||
| 661 | * @return string |
||
| 662 | */ |
||
| 663 | public function last_sql_query() |
||
| 664 | { |
||
| 665 | return $this->last_query; |
||
| 666 | } |
||
| 667 | |||
| 668 | } |
||
| 669 |