Ahoritica me encuentro trabajando en un proyecto para la web y dada mi poca experiencia en otros lenguajes opté por PHP ya que necesitaba actuar raoidamente en este proyecto.
No creo que sea para hacer "paginitas"... algunos ignorantes dirian que delphi solo es para hacer "programitas"... pero que le vamos a hacer... ahi quienes comen moco y se esconden debajo de la cama pa'que no les pidan.
esta clase la hice en estos dias... me sirve para abstraer a php una tabla y ejecutar las funciones mas básicas (insertar, actualizar, eliminar) <<depende de otras clases>>
Código PHP:
class tge_dbtable {
const CAN_GET_ALL = TRUE;
const CANT_GET_ALL = FALSE;
const SEPARATOR_DEFAULT = ",";
const SEPARATOR_AND = "and";
const ASSIGN = TRUE;
const NOT_ASSIGN = FALSE;
protected $db;
protected $table_name;
protected $table_alias;
protected $sql;
protected $fields;
protected $registros;
public $listado;
public $join;
public function __construct($table_name, $table_alias = "t0"){
$this->db = mysql_layer::getInstance(DB_LINK);
$this->registros = new mysql_recordset(false);
$this->listado = new mysql_recordset(false);
$this->table_name = $table_name;
$this->table_alias = $table_alias;
$result = $this->exec_query("SHOW COLUMNS FROM {$this->table_name}");
while ($field = mysql_fetch_object($result)){
$fieldname = $field->Field;
$this->fields[] = $this->table_alias.".".$fieldname;
$this->$fieldname = $field->Default;
}
}
protected function get_fields($fields, $cangetall = self::CAN_GET_ALL, $assign = self::NOT_ASSIGN, $separator = self::SEPARATOR_DEFAULT){
$sql = "";
if (is_string($fields)){
if (strlen($fields) > 0){
if (!$assign) $fields = explode(",", $fields);
else $sql .= $fields;
} else {
if ($cangetall) $sql .= "* ";
}
}
if (is_array($fields)){
$fieldcount = count($fields);
$i = 1;
if (!$assign){
foreach ($fields as $field) {
$sql .= trim($field);
if ($i < $fieldcount) $sql .= "{$separator} ";
$i++;
}
} else {
foreach ($fields as $field => $value) {
$field = trim($field);
$value = trim($value);
$sql .= "{$field} = '{$value}'";
if ($i < $fieldcount) $sql .= "{$separator} ";
$i++;
}
}
}
return $sql;
}
private function get_values($values, $separator = self::SEPARATOR_DEFAULT){
$sql = "";
if (is_string($values)){
if (strlen($values) > 0){
$values = explode(",", $values);
} else {
if ($cangetall) $sql .= "";
}
}
if (is_array($values)){
$pattern = "/'(.*?)'/";
$count = count($values);
$i = 1;
foreach ($values as $value) {
$value = trim($value);
$match = array(); $pm = preg_match($pattern, $value, $match);
if ($pm) $value = $match[1];
if(is_string($value)) $value = "'{$value}'";
$sql .= "{$value}";
if ($i < $count) $sql .= "{$separator} ";
$i++;
}
}
return $sql;
}
private function get_where($where, $operator = self::SEPARATOR_AND){
$sql = "";
if (is_string($where)){
if (strlen($where) > 0){
$sql .= " where ". $where . " ";
} else {
$sql .= " ";
}
}
if (is_array($where)){
$i = 0;
foreach ($where as $key => $value) {
$pattern = "/#(.*?)#/"; $condition = "";
if ($i == 0) $condition = " where ";
else {
$operator = $operator;
$matches = array(); $pm = preg_match($pattern, $key, $matches);
if ($pm) {
$key = str_replace($matches[0], "", $key);
$operator = $matches[1];
}
$condition = $operator . " ";
}
$matches = array(); $pm = preg_match($pattern, $value, $matches);
$operator = "=";
if ($pm) {
$value = str_replace($matches[0], "", $value);
$operator = $matches[1];
}
$condition .= "{$key} {$operator} '{$value}' ";
$sql .= $condition;
$this->$key = $value;
$i++;
}
}
return $sql;
}
private function get_join($joins = array()){
$sql = "";
foreach ($joins as $join) {
//$sql .= " {$type} join {$condition} ";
if (is_object($join) && get_class($join) == "tge_join_data"){
$join = new tge_join_data($join->type, $join->table, $join->alias, $join->conditions);
//get join fields
$result = $this->exec_query("SHOW COLUMNS FROM {$join->table}");
while ($field = mysql_fetch_object($result)){
$fieldname = $field->Field;
$this->fields[] = $join->alias .".". $fieldname;
}
$conditions = "";
if (is_string($join->conditions)) $conditions = $join->conditions;
else {
$i = 0;
foreach ($join->conditions as $condition) {
if ($i > 0) {
$pattern = "/#(.*?)#/"; $operator = "and";
$matches = array(); $pm = preg_match($pattern, $condition, $matches);
if ($pm) {
$condition = str_replace($matches[0], "", $condition);
$operator = $matches[1];
}
$conditions .= " {$operator} ";
}
$conditions .= $condition;
$i++;
}
}
$sql .= " {$join->type} join {$join->table} {$join->alias} on $conditions";
}
}
return $sql;
}
/**
* Obtener registros de una tabla.
* @param string / array $fields
* @param string / array $where
* @param string / array $limit
* <br/>
* <br/>
* <b>$fields [string]</b> ej. "field1, field2".<br/>
* <b>$fields [array()]</b> ej. array("field1", "field2")<br/>
* <b>$where [string]</b> ej. "field1 = value and field2 = value".<br/>
* <b>$where [array()]</b> ej. array("field1"=>"value", "field2"=>"value")<br/>
* <b>Filtro en $where:</b> array("<font color="red"><b>#or#</b></font>field1"=>"<font color="red"><b>#like#</b></font>value")<br/>
* <b>$limit [string]</b> ej. "0, 30".<br/>
*/
protected function get_registros($fields = "", $where = "", $extra = ""){
$sql = "select ";
//Get JOIN
$join = ""; if (is_array($this->join)) $join .= $this->get_join($this->join);
//Fields
$fields = $this->fields;
$sql .= $this->get_fields($fields);
//FROM
$sql .= " from {$this->table_name} {$this->table_alias} ";
//WHERE
$sql .= $this->get_where($where);
//ADD - JOIN
if ($join != "") $sql .= $join;
//EXTA (ORDER BY, LIMITS)
if (is_string($extra)) if (strlen($extra) > 0) $sql .= " {$extra} ";
$result = $this->exec_query($sql);
$this->registros = new mysql_recordset($result);
$this->listado = $this->registros;
return $this->registros;
}
public function get_listado(){ return $this->listado; }
protected function exec_query($query){
//CLEAN - TRIM
for ($j = 0; $j < 10; $j++) {
$query = str_replace(" ", " ", $query);
$query = str_replace("\n", " ", $query);
$query = str_replace("\t", " ", $query);
}
$this->sql = $query;
$result = $this->db->query($query);
return $result;
}
public function clean_alias($fieldname){
$fieldname = str_ireplace($this->table_alias.".", "", $fieldname);
return $fieldname;
}
protected function get_update($values, $where){
$query = "update {$this->table_name} set ";
$query .= $this->get_fields($values, self::CANT_GET_ALL, self::ASSIGN);
$query .= $this->get_where($where);
return $query;
}
public function update($values, $where){
$query = $this->get_update($values, $where);
$exec = $this->exec_query($query);
return $exec;
}
protected function get_insert($fields, $values){
$query = "insert into {$this->table_name} ";
$query .= "(". $this->get_fields($fields, self::CANT_GET_ALL) .") ";
$query .= "values (". $this->get_values($values) .") ";
return $query;
}
public function insert($fields, $values){
$query = $this->get_insert($fields, $values);
$exec = $this->exec_query($query);
return $exec;
}
protected function get_delete($where = ""){
$query = "delete from {$this->table_name} ";
$query .= $this->get_where($where);
return $query;
}
public function delete($where = ""){
$query = $this->get_delete($where);
$exec = $this->exec_query($query);
return $exec;
}
}
y su implementación a la hora de trabajar es bastante sencilla...
Código PHP:
class tge_clientes extends tge_dbtable {
public function __construct(){
parent::__construct("tgv_cli_clientes");
}
public function get_listado(){
parent::get_registros($this->fields);
return $this->listado;
}
}
no se no se... talvéz no aporte mucho pero PHP me ha dado buenos y excelentes resultados... nno conozco ni ruby ni pithon ni perl y no puedo opinar nada de ellos.. se que tienen buena pinta pero mientras logre conseguir lo que quiero con PHP para que aventurarme hasta aquellos lados.
El proyecto actual es para el control de distribución, manejo de clientes, mantenimientos etc de una marca de filtros de motor en todo el pais... no se no le veo nada de "paginita" (ya que estamos poco diplomaticos)
03-04-2011
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Modo Hilado