Datasource Abstraktion
Hier eine Abstraktionsklasse für Datenbanken.Die Klasse kann so erweitert werden, dass auch Abfragen auf CSV-Dateien, auf Prop-Dateien oder auf das Dateisystem möglich sind.
Für Datenbanken verwendet die Klasse über PDO 'Prepared Statements'. Sie speichert alle Abfragen in einem kleinen Cache. So müssen sich wiederholende Abfragen von der Datenbank nicht erneut geparsed werden. Dies ist besonders hilfreich, wenn viele gleiche Abfragen (mit unterschiedlichen Werten natürlich) hintereinander ausgeführt werden. Allerdings muss man natürlich sagen, dass dies zu Lasten von PHP geht und es letzten Endes fraglich ist, ob das wirklich schneller ist. Ich werde dies bei Zeiten einmal untersuchen und Tests dazu machen.
Beispiele für die Anwendung siehe hier: Datasource Anwendung
ddatasource.inc
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<?php
define('TYP_INT', 'INT');
define('TYP_VARCHAR', 'VARCHAR');
define('TYP_TEXT', 'TEXT');
define('NOT_NULL', 'NOT_NULL');
define('ALLOW_NULL', 'NULL');
define('AUTO', 'AUTO_INCREMENT');
define('PK', 'PRIMARY KEY');
define('FETCH_ASSOC', PDO::FETCH_ASSOC);
define('FETCH_NUM', PDO::FETCH_NUM);
define('FETCH_BOTH', PDO::FETCH_BOTH);
//define('FETCH_ASSOC', MYSQL_ASSOC);
//define('FETCH_NUM', MYSQL_NUM);
//define('FETCH_BOTH', MYSQL_BOTH);
if(!function_exists('debug')) { function debug($str) { global $debugStr;$debugStr .= $str . "<br>\n";} }
interface result {
function fetch($f=FETCH_BOTH);
function execute($d=null);
function rowCount();
function toArray();
}
interface datasource {
function select($fields, $tab, $con, $join, $group, $order, $limit);
function insert($data, $tab);
function update($data, $tab, $con);
function delete($tab, $con);
function addTable($tab, $fields);
function delTable($tab);
function getTables();
function getFields($tab);
function save();
function rollback();
}
class sqlHelper {
var $fields = '*';
var $tab = '';
var $con = '';
var $join = '';
var $order = '';
var $group = '';
var $limit = '';
function resetHelper() {$this->fields = '*';$this->tab = '';$this->con = '';$this->join = '';$this->order = '';$this->group = '';$this->limit = ''; }
function SELECT($fields) { $this->fields = $fields; return $this; }
function FROM($tab){ $this->tab = $tab; return $this; }
function WHERE($con) { $this->con = $con; return $this; }
function JOIN($join) {$this->join = $join; return $this; }
function ORDERBY($order) {$this->order = $order; return $this; }
function GROUPBY($group) {$this->group = $group; return $this; }
function LIMIT($limit) {$this->limit = $limit; return $this; }
function execute() { $f=$this->fields; $t=$this->tab; $c=$this->con; $j=$this->join; $g=$this->group;$o=$this->order;$l=$this->limit; $this->resetHelper(); return $this->select($f, $t, $c, $j, $g, $o, $l); }
}
class resultDB {
var $stmt;
function resultDB($stmt) { $this->__construct($stmt); }
function __construct($stmt) { $this->stmt = $stmt; }
function fetch($f=FETCH_BOTH) { return $this->stmt->fetch($f); }
function execute($d=null) { return $this->stmt->execute($d); }
function rowCount() { return $this->stmt->rowCount(); }
function toArray($id='', $f=FETCH_ASSOC) { $ret=array(); while($row = $this->stmt->fetch($f)) if(empty($id)) $ret[] = $row; else $ret[$row[$id]] = $row; return $ret; }
function toHtmlTable() {
$out = '<table class="display"><thead><tr>';
$row = $this->stmt->fetch(FETCH_ASSOC);
foreach($row as $k=>$v)
$out .='<th>'.$k.'</th>';
$out .= '</tr></thead><tbody>';
do {
$out .= '<tr>';
foreach($row as $k=>$v)
$out .='<td>'.$v.' </td>';
$out .= '</tr>';
}while($row = $this->stmt->fetch(FETCH_ASSOC));
return $out.'</tbody></table>';
}
}
class database extends sqlHelper {
var $ds;
var $last = array();
function database($config) { $this->__construct($config); }
function __construct($config) { $this->ds = new PDO($config['driver'].':host='.$config['host'].(empty($config['port']) ? '' : ';port='.$config['port']).';dbname='.$config['db'], $config['user'], $config['password']);
$this->ds->query("SET NAMES 'utf8';");
}
function getCon($con, &$values=array()) {
if(empty($con)) {
return '';
} else if(is_array($con)) {
$ret='';
foreach($con as $k=>$v) {
$tl = substr($v,0,2);
if(substr($v,0,4)=='like') {
$ret .= $k.' like ? AND ';
$values[] = substr($v,4);
}elseif($tl=='<=' || $tl=='>=' || $tl=='<>') {
$ret .= $k.$tl.'? AND ';
$values[] = substr($v,2);
} elseif($v[0]=='='||$v[0]=='<'||$v[0]=='>') {
$ret .= $k.$v[0].'? AND ';
$values[] = substr($v,1);
} else {
$ret .= $k.'=? AND ';
$values[] = $v;
}
}
return " WHERE ".substr($ret,0,-5);
} else if(!strstr($con,'=') && !strstr($con,'<') && !strstr($con,'>')) {
$values = array($con);
return ' WHERE id=?';
} else {
return ' WHERE '.$con;
}
}
function select($fields, $tab='', $con='', $join='', $group='', $order='', $limit='') {
if(func_num_args()==1) {
$this->fields = $fields;
return $this;
}
$conValues = array();
if(!empty($join)) {
$sql = "SELECT $fields FROM `$tab` ".$join[0]." ".$join[1]." ON ".$join[2]." = ".$join[3]." ".$this->getCon($con, $conValues);
} else {
$sql = "SELECT $fields FROM `$tab` ".$this->getCon($con, $conValues);
}
if(!empty($group))
$sql .= ' GROUP BY '.$group;
if(!empty($order))
$sql .= ' ORDER BY '.$order;
if(!empty($limit))
$sql .= ' LIMIT '.$limit;
$id = md5($sql);
if(!array_key_exists($id, $this->last)) {
debug('new Statement:'.$sql.' '.print_r($conValues, true));
$this->last[$id] = $this->ds->prepare($sql);
} else
debug('old Statement:'.$sql.' '.print_r($conValues, true));
$this->last[$id]->execute($conValues);
return new resultDB($this->last[$id]);
}
function insert($data, $tab) {
if(!is_array($data[0]))
$data = array($data);
$ids = array();
foreach($data as $d) {
$sql = "INSERT INTO `$tab` ".(isset($d[0])?'':("(".implode(',',array_keys($d)).")"))." VALUES (".(count($d)>0 ? (str_repeat('?,',count($d)-1)."?"):'').")";
$id = md5($sql);
if(!array_key_exists($id, $this->last)) {
debug('new Statement:'.$sql.' '.print_r(array_values($d), true));
$this->last[$id] = $this->ds->prepare($sql);
} else
debug('old Statement:'.$sql.' '.print_r(array_values($d), true));
$this->last[$id]->execute(array_values($d));
$ids[] = $this->ds->lastInsertId();
}
return (count($ids)==1 ? $ids[0] : $ids);
}
function update($data, $tab, $con) {
if(!is_array($data) || !isset($data[0]) ) {
$data = array($data);
$con = array($con);
}
foreach($data as $nr=>$d) {
$conValues = array();
if(is_array($d)) {
$sql = "UPDATE `$tab` SET `".implode('` = ?,`',array_keys($d))."` = ? ".$this->getCon($con[$nr], $conValues);
$id = md5($sql);
if(!array_key_exists($id, $this->last)) {
debug('new Statement:'.$sql.' '.print_r(array_merge(array_values($d),$conValues), true));
$this->last[$id] = $this->ds->prepare($sql);
} else
debug('old Statement:'.$sql.' '.print_r(array_merge(array_values($d),$conValues), true));
$this->last[$id]->execute(array_merge(array_values($d),$conValues) );
} else {
$sql = "UPDATE `$tab` SET ".$d." ".$this->getCon($con[$nr], $conValues);
$id = md5($sql);
if(!array_key_exists($id, $this->last)) {
debug('new Statement:'.$sql.' '.print_r($conValues, true));
$this->last[$id] = $this->ds->prepare($sql);
} else
debug('old Statement:'.$sql.' '.print_r($conValues, true));
$this->last[$id]->execute($conValues);
}
}
return;
}
function delete($tab, $con) {
$conValues = array();
$sql = "DELETE FROM `$tab` ".$this->getCon($con, $conValues);
$id = md5($sql);
if(!array_key_exists($id, $this->last)) {
debug('new Statement:'.$sql.' '.print_r($conValues, true));
$this->last[$id] = $this->ds->prepare($sql);
} else
debug('old Statement:'.$sql.' '.print_r($conValues, true));
$this->last[$id]->execute($conValues);
return;
}
function getFields($tab) {
$stmt = $this->ds->prepare("SHOW COLUMNS FROM `".$tab."`");
$stmt->execute();
return new resultDB($stmt);
}
function getTables() {
$stmt = $this->ds->prepare("SHOW TABLES");
$stmt->execute();
return new resultDB($stmt);
}
function addTable($tab, $fields) {
$options[TYP_INT] = 'INT';
$options[TYP_VARCHAR] = 'VARCHAR';
$options[TYP_TEXT] = 'TEXT';
$options[NOT_NULL] = 'NOT NULL';
$options[ALLOW_NULL] = 'NULL';
$options[AUTO] = 'AUTO_INCREMENT';
$options[PK] = 'PRIMARY KEY';
$sql = "CREATE TABLE `".$tab."` ( ";
if(is_array($fields)) {
foreach($fields as $k=>$o) {
if(!is_numeric($k)) {
$sql .= "`".$k."` ";
if(is_array($o))
foreach($o as $v)
if(is_numeric($v))
$sql .= '('.$v.') ';
else
$sql .= $options[$v].' ';
else
$sql .= $o;
$sql .= ', ';
} else
$sql .= "`".$o."` , ";
}
$sql = substr($sql,0,-2);
} else
$sql .= $fields;
$sql .= " )";
debug($sql);
$stmt = $this->ds->prepare($sql);
$stmt->execute();
}
function delTable($tab) {
$sql = "DROP TABLE `".$tab."`";
debug($sql);
$stmt = $this->ds->prepare($sql);
$stmt->execute();
return;
}
/*
CREATE TABLE `db10478474-blf`.`test` (
`id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`title` VARCHAR( 255 ) NOT NULL ,
`text` TEXT NOT NULL
) ENGINE = MYISAM
*/
function save() {}
function rollback() {}
}
define('CSV_DEL', ';');
define('CSV_MAX_LINE', 1000);
class resultArray {
var $data;
var $i=0;
function __construct($data) { $this->data = $data; }
function fetch($f=FETCH_BOTH) { if($this->i>=count($this->data)) return false; else return $this->data[$this->i++]; }
function execute($d=null) { die('not implemented yet'); }
function rowCount() { return count($this->data); }
function toArray() { return $this->data; }
}
/*class File {
static function getFileObject($config) {
switch($config['driver']) {
case 'csv':
return new csvFile($config);
case 'prop':
return new propFile($config);
default:
die('not implemented driver for file');
}
}
}*/
class csvFile {
var $config;
function __construct($config) { $this->config = $config; }
function getFile($tab) {
global $inc_root;
return $inc_root.'data/ds/'.$this->config['db'].'/'.$tab.".csv";
}
function loadFields($tab) {
$handle = fopen($this->getFile($tab),"r");
$data = fgetcsv($handle, CSV_MAX_LINE, CSV_DEL);
fclose($handle);
return $data;
}
function select($fields, $tab, $con='') {
$handle = fopen($this->getFile($tab),"r");
$header = fgetcsv($handle, CSV_MAX_LINE, CSV_DEL);
while( ($data = fgetcsv ($handle, CSV_MAX_LINE, CSV_DEL)) !== FALSE ) {
$ret[] = array_combine($header, $data);
}
fclose($handle);
return new resultArray($ret);
}
function insert($data, $tab) { die('not implemented yet');
}
function update($data, $tab, $con) { die('not implemented yet');
}
function delete($tab, $con) { die('not implemented yet');
}
function getFields($tab) {
$data = $this->loadFields($tab);
$ret=array();
foreach($data as $v)
$ret[] = array('Field'=>$v, 'Type'=>'text');
return new resultArray($ret);
}
function getTables() {
global $inc_root;
$data = getFilesFromDir($inc_root.'data/ds/'.$this->config['db']);
$ret=array();
foreach($data as $v)
$ret[] = array(str_replace('.csv','',$v));
return new resultArray($ret);
}
function save() {}
function rollback() {}
}
class propFile {
var $config;
function __construct($config) { $this->config = $config; }
function getFile($tab) {
global $inc_root;
return $inc_root.'data/ds/'.$this->config['db'].'/'.$tab.".csv";
}
function select($fields, $tab, $con='') {
$prop=array();
$handle = fopen($this->getFile($tab),"r");
while(!feof($handle)) {
$buffer = fgets($handle, 4096);
$s = substr(strstr($buffer, '='),1);
if($s[0]==" ") $s = substr($s,1);
$s = str_replace("\n","",$s);
$prop[] = array('id'=> trim(strstr($buffer, '=', true)), 'value'=>$s);
}
fclose($handle);
return new resultArray($ret);
}
function insert($data, $tab) { die('not implemented yet');
}
function update($data, $tab, $con) { die('not implemented yet');
}
function delete($tab, $con) { die('not implemented yet');
}
function getFields($tab) {
$ret=array( array('Field'=>'key', 'Type'=>'text'),
array('Field'=>'value', 'Type'=>'text'));
return new resultArray($ret);
}
function getTables() {
global $inc_root;
$data = getFilesFromDir($inc_root.'data/ds/'.$this->config['db']);
$ret=array();
foreach($data as $v)
$ret[] = array(str_replace('.properties','',$v));
return new resultArray($ret);
}
function save() {}
function rollback() {}
}