PHP資料庫操作基底類別(單例模式)

自己練習寫的資料庫操作基類,包含最基本的CURD操作.可整合到框架內.

// 設定檔

$db = array(
 'host'=>'localhost',
 'user'=> 'root',
 'password'=>'',
 'database'=>'test',
)

?>
//php 類別
class db {
 public $conn;
 public static $sql;
 public static $instance=null;
 private function __construct(){
 require_once('db. config.php');
 $this->conn = mysql_connect($db['host'],$db['user'],$db['password']);
 if(!mysql_select_db( $db['database'],$this->conn)){
 echo "失敗";
 };
 mysql_query('set names utf8',$this->conn);
 }
 public static function getInstance(){
 if(is_null(self::$instance)){
 self::$instance = new db;
 }
 return self:: instance;
 }
 /**
 * 查詢資料庫
*/
 public function select($table,$condition=array(),$field = array()){
 $where='' ;
 if(!empty($condition)){

 foreach($condition as $k=>$v){
 $where.=$k."='".$v ."' 和 ";
 }
 $where='where '.$where .'1=1';
 }
 $fieldstr = '';
 if(!empty( $field)){

 foreach($field as $k=>$v){
 $fieldstr.= $v.',';
 }
 $fieldstr = rtrim( $fieldstr,',');
 }else{
 $fieldstr = '*';
 }
 self::$sql = "select {$fieldstr} from {$table} {$ where}";
 $result=mysql_query(self::$sql,$this->conn);
 $resuleRow = array();
 $i = 0;
 while($row =mysql_fetch_assoc($result)){
 foreach($row as $k=>$v){
 $resuleRow[$i][$k] = $v;
 }
 $i++ ;
 }
 return $resuleRow;
 }
 /**
 * 新增一筆記錄
*/
 public function insert($table,$data){
 $values = '';
 $datas = '';
 foreach($data as $k=>$v){
 $values.=$k.',';
 $datas.="'$v '".',';
 }
 $values = rtrim($values,',');
 $datas = rtrim($datas,',');
 self::$ sql = "INSERT INTO {$table} ({$values}) VALUES ({$datas})";
 if(mysql_query(self::$sql)){
 return mysql_insert_id();
 }else{
 return false;
 };
 }
 /**
 * 修改一筆記錄
*/
 public function update($table,$data,$condition=array()){
 $where='';
 if(!empty($condition)){

 foreach($condition as $k=>$v){
 $where.=$k ."='".$v."' 和 ";
 }
 $where='where '.$where .'1=1';
 }
 $updatastr = '';
 if(!empty($data)){
 foreach($data as $k=>$v){
 $updatastr.= $k."='".$v."', ";
 }
 $updatastr = 'set '.rtrim($updatastr,',');
 }
 self::$sql = "update {$table} {$updatastr} { $where}";
 return mysql_query(self::$sql);
 }
 /**
 * 刪除記錄
*/
 public function delete($table,$condition){
 $where='';
 if(!empty($condition)){

 foreach($condition as $k=>$v){
 $where.=$k."= '".$v."' and ";
 }
 $where='where '.$where .'1=1';
 }
 self::$sql = "delete from {$table} {$where}";
 return mysql_query(self::$sql);

 }

 public static function getLastSql(){
 echo self:: $sql;
 }



}

$db = array(
 'host'=>'localhost',
 'user'=>'root',
 'password'=>'',
 'database'=>'test',
)

?>

class db {
 public $conn;
 public static $sql;
 public staticic $ require_once('db.config.php');
 $this->conn = mysql_connect($db['host'],$db['user'],$db [ ' password']);
 if(!mysql_select_db($db['database'],$this->conn)){
 echo "失敗";
 };
 mysql_query( '設定名稱utf8',$this->conn);
 }
 public static function getInstance(){
 if(is_null(self::$instance)){
 self::$instance = new db;
 }
 return self ::$instance;
 }
 /**
 * 查詢資料庫
*/
 public function select($table,$condition=array(),$field = array()){
 $where ='';
 if(!empty($condition)){

 foreach($condition as $k=>$v){
 $where.=$k."=' " .$v."' 和";
 }
 $where='where '.$where .'1=1';
 }
 $fieldstr = '';
 if ( !empty($field)){

 foreach($field as $k=>$v){
 $fieldstr.= $v.',';
 }
 $fieldstr = rtrim($fieldstr,',');
 }else{
 $fieldstr = '*';
 }
 self::$sql = "從{ 選出{$fieldstr} $table } {$where}";
 $result=mysql_query(self::$sql,$this->conn);
 $resuleRow = array();
 $i = 0;
 while ($row=mysql_fetch_assoc($result)){
 foreach($row as $k=>$v){
 $resuleRow[$i][$k] = $v;
 }
 $i++;
 }
 return $resuleRow;
 }
 /**
 * 新增一筆記錄
*/
 public function insert($table,$data){
 $values = '';
 $datas = '';
 foreach($data as $k=>$v){
 $values.=$k.',';
 $datas.=" '$v'".',';
 }
 $values = rtrim($values,',');
 $datas = rtrim($datas,',') ;
 self ::$sql = "插入{$table} ({$values}) VALUES ({$datas})";
 if(mysql_query(self::$sql)){
 return mysql_insert_id();
 }else{
 return false;
 };
 }
 /**
 * 修改一筆記錄
*/
 public function update($table,$data, $condition=array() ){
 $where='';
 if(!empty($condition)){

 foreach($condition as $k=>$v){
 $where.= $k."='".$v."' 和";
 }
 $where='where '.$where .'1=1';
 }
 $updatastr = ' ';
 if(!empty($data)){
 foreach($data as $k=>$v){
 $updatastr.= $k." ='".$v." ',";
 }
 $updatastr = 'set '.rtrim($updatastr,',');
 }
 self::$sql = " update {$table} {$updatastr } {$where}";
 return mysql_query(self::$sql);
 }
 /**
 * 刪除記錄
*/
 public function delete( $table,$condition){
 $where='';
 if(!empty($condition)){

 foreach($condition as $k=>$v){
 $where.=$k. "='".$v."' 和";
 }
 $where='where '.$where .'1=1';
 }
 self::$sql = " From {$table} {$where} 中刪除";
 return mysql_query(self::$sql);

 }

 公用靜態函式getLastSql(){
 echo self::$sql;
 }



}

$db = db::getInstance();
 //$list = $db- >select('demo',array('name'=>'tom','password'=>'ds'),array('name','password')) ;
//echo $db-> insert('demo',array('name'=>'最近你啦','password'=>'123'));
//echo $db->update('demo',array("name "=>'xxx',"密碼"=>'123'),array('id'=>1));
echo $db->delete('demo',array('id'=>' 2'));
db::getLastSql();
echo "";
? >