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database.class.php
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database.class.php
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<?php
class DataBase {
private $_mainTable;
private $_connection;
private $_orderBy;
private $_order;
private $_hasOne = array();
// private $_hasMany;
// private $_tVYPAV; // Tiene varios y pertenece a varios
private $_limit = PAGINATE_LIMIT;
private $_limited = null;
private $_page = 1;
private $_totalResults;
private $_search = array();
private $_returnFields = array();
private $_searchType;
private $_likeMode = "nonStrict";
public function __construct($modelName) {
// parent::__construct($modelName);
$this->_mainTable = $modelName;
}
public function crear() {
// INSERT INTO tabla keys VALUES (:values)
// INSERT INTO modelo $_POST[keys] VALUES (:$_POST[keys])
}
public function buscar() {
}
public function actualizar() {
// UPDATE tabla SET (keys) = (:values) WHERE id = :id
// UPDATE modelo set $_POST[keys] = (:$_POST[keys]) WHERE id = :$_GET[id] arg[0]
}
public function actualizarTodos() {
// UPDATE modelo SET $_pOST[keys] = (:$_POST[keys]) WHERE campo = :$_GET[id]
}
public function borrar() {
// DELETE FROM tabla WHERE key = :id
}
public function borrarTodos() {
// DELETE FROM model WHERE key = :id
}
// Funciones generales
public function setTable($table){
$this->_mainTable = $table;
}
public function returnFields() {
if(func_num_args() > 1) {
foreach(func_get_args() as $arrVal) {
array_push($this->_returnFields, $arrVal);
}
} else if (func_num_args() == 1) {
$arg = func_get_arg(0);
if(is_array($arg)) {
foreach($arg as $arrVal) {
array_push($this->_returnFields, $arrVal);
}
} else if (is_string($arg)) {
$stringArray = $this->splitWords($arg);
foreach($stringArray as $val) {
array_push($this->_returnFields, $val);
}
} else {
die("error en return fields");
}
} else {
die("argumentos de return fields no puede estar en blanco");
}
}
private function splitWords($palabras) {
$palabras = preg_replace('/[,\s]+$/', "", $palabras);
$palabras = preg_split('/[,\s]+/', $palabras);
return $palabras;
}
// Funciones para Busqueda
public function where($arg, $field = null) {
if($field === null && is_numeric($arg)) {
$this->_search['id'] = $arg;
} else if ($field != null) {
if(is_string($field) && is_string($arg)) {
$this->_search[$field] = $arg;
} else {
die("field can only be string");
}
} else {
// Error where;
die("error con where");
}
$this->_searchType = "where";
}
public function like($search, $field = null) {
if(!empty($search) && $field != null && !empty($field) ) {
$this->_search[$field] = $search;
$this->_searchType = "like";
} else {
die("error like");
}
}
public function all($table) {
$this->_mainTable = $table;
$this->_searchType = "all";
}
public function likeMode($mode) {
if($mode == "strict") {
$this->_likeMode = $mode;
} else {
$this->_likeMode = "nonStrict";
}
}
public function hasOne($table, $fields) {
$this->_hasOne[$table] = array();
if(is_array($fields)) {
$this->_hasOne[$table] = $fields;
} else {
$stringArray = $this->splitWords($fields);
foreach($stringArray as $val) {
array_push($this->_hasOne[$table], $val);
}
}
}
/*
public function belongsTo() {
}
public function hasMany() {
}
*/
public function setLimit($limit) {
$this->_limited = true;
$this->_limit = (int) $limit;
}
public function setPage($page) {
$this->_page = (int) $page;
}
public function orderBy($orderBy, $order = "ASC") {
$this->_orderBy = $orderBy;
$this->_order = ($order == "ASC")?$order:"DESC";
}
public function getTotalPages() {
return floor($this->_totalResults/$this->_limit);
}
private function getWhereStatement() {
$select = $this->getSelect();
$from = $this->getFrom();
switch ($this->_searchType) {
case "where":
$where = " WHERE ".$this->getWhere();
break;
case "like":
$where = " WHERE ".$this->getLike();
break;
case "all":
$where = "";
break;
default:
$where = "";
break;
}
$order = $this->getOrder();
$limit = $this->getLimit();
$this->_resultsQuery = "SELECT ".$select." FROM ".$from.$where.$order.$limit;
$this->_queryTotalPages = "SELECT ".$select." FROM ".$from.$where;
//$this->_bindValues;
}
public function getResults() {
if($this->_connection == null) {
$this->_connection = new Connection();
}
$this->getStatements();
$result = $this->_connection->prepare($this->_resultsQuery);
$result->setFetchMode(PDO::FETCH_ASSOC);
if($this->_searchType == "where") {
foreach($this->_search as $key => $val) {
$result->bindValue($key,$val);
}
} else if ($this->_searchType == "like") {
foreach($this->_search as $key => $val) {
$result->bindValue($key, "%".$val."%");
}
}
try{
$result->execute();
} catch (PDOException $e){
echo "ERROR: " . $e->getMessage();
}
$page = $this->_connection->prepare($this->_queryTotalPages);
$page->setFetchMode(PDO::FETCH_ASSOC);
foreach($this->_search as $key => $val) {
$page->bindValue($key,$val);
}
try{
$page->execute();
} catch (PDOException $e) {
echo $e->getMessage();
}
$qResult = $result->fetchAll();
$this->_totalResults = $page->rowCount();
// return array($qResult, $this->getTotalPages());
$this->restartValues();
return (count($qResult) == 1)?$qResult[0]:$qResult;
}
public function getSelect() {
$string = "";
$count = count($this->_returnFields);
if($count > 0) {
$string .= $this->joinFields($this->_returnFields, $this->_mainTable);
$stringExtraFields = $this->getExtraFields();
if(!empty($stringExtraFields)) {
$string .= ", ".$stringExtraFields;
}
} else {
$string = "*";
}
return $string;
}
private function getExtraFields() {
$string = "";
if(count($this->_hasOne) > 0) {
foreach($this->_hasOne as $key => $val) {
if(is_string($val)) {
$string .= ", ".$key.".".$val;
} else if (is_array($val)) {
$string .= $this->joinFields($val, $key);
} else {
die("error con getExtraFields");
}
}
}
return $string;
}
public function getFrom() {
$string = $this->_mainTable;
$string .= $this->getJoinOn();
return $string;
}
private function getJoinOn() {
$string = "";
if(count($this->_hasOne) > 0) {
foreach($this->_hasOne as $key => $val) {
$string .= " LEFT JOIN ".$key." ON ".$this->_mainTable.".id_".$key." = ".$key.".id";
}
}
return $string;
}
public function getWhere() {
$string = "";
$i = 0;
$searchCount = count($this->_search);
if($searchCount > 0) {
foreach($this->_search as $key => $val) {
$string .= $this->_mainTable.".".$key." = :".$key;
if($i < ($searchCount -1)) {
$string .= " AND ";
}
$i++;
}
} else {
die("getWhere error, no hay parametros");
}
return $string;
}
public function getLike() {
$string = "";
$i = 0;
$searchCount = count($this->_search);
if($searchCount > 0) {
foreach($this->_search as $key => $val) {
$string .= $this->_mainTable.".".$key." LIKE :".$key;
if($i < ($searchCount - 1)) {
$string .= ($this->_likeMode == "nonStrict")? " OR ": " AND ";
}
$i++;
}
} else {
die("getLike error");
}
return $string;
}
public function getOrder() {
$string = "";
if(is_string($this->_orderBy) && is_string($this->_order)) {
$string .= " ORDER BY ".$this->_mainTable.".".$this->_orderBy." ".$this->_order;
}
return $string;
}
public function getLimit() {
$string = "";
if($this->_limit > 0 && $this->_page > 0 && $this->_limited != null) {
$string .= " LIMIT ".(($this->_page - 1) * $this->_limit).",".$this->_limit;
}
return $string;
}
private function joinFields($val, $table) {
$string = "";
$count = count($val);
if($count > 0) {
foreach($val as $i => $field) {
$string .= $table.".".$field;
if($i < ($count -1)) {
$string .= ", ";
}
}
}
return $string;
}
private function restartValues() {
$this->_orderBy = null;
$this->_order = null;
$this->_limit = PAGINATE_LIMIT;
$this->_page = 1;
$this->_totalResults = null;
$this->_limited = null;
$this->_searchType = null;
$this->_likeMode = "nonStrict";
$this->_hasOne = array();
$this->_search = array();
$this->_returnFields = array();
}
}
// SELECT campos FROM tabla LEFT JOIN tabla.campo ON tabla2.campo2 WHERE campo = valor ORDER BY id ASC LIMIT x,y