PHP基于MySQL数据库实现对象持久层的方法

本文实例讲述了PHP基于MysqL 数据库实现对象持久层的方法。分享给大家供大家参考。具体如下：

心血来潮，做了一下PHP的对象到数据库的简单持久层。

不常用PHP，对PHP也不熟，关于PHP反射的大部分内容都是现学的。

目前功能比较弱，只是完成一些简单的工作，对象之间的关系还没法映射，并且对象的成员只能支持string或者integer两种类型的。

成员变量的值也没有转义一下。。。

下面就贴一下代码：

首先是数据库的相关定义，该文件定义了数据库的连接属性：

PHP;">

下面是数据库访问的简单封装：

PHP;"> PHP /* * Filename: database.PHP * Created on 2012-9-29 * Created by RobinTang * To change the template for this generated file go to * Window - Preferences - PHPeclipse - PHP - Code Templates */ include_once("config.PHP"); $debug = false; $g_out = false; function out($s){ global $g_out; $g_out .= $s; $g_out .= "\r\n"; } function db_openconnect(){ $con = MysqL_connect(DBHOST,DBUSER,DBPSWD);

if(!<a href="https://www.jb51.cc/tag/MysqL/" target="_blank" class="keywords">MysqL</a>_set_charset("utf8",$con)){ 
  out("set <a href="https://www.jb51.cc/tag/MysqL/" target="_blank" class="keywords">MysqL</a> encoding fail"); 
} 
if (!$con){ 
  out('Could not connect: ' . <a href="https://www.jb51.cc/tag/MysqL/" target="_blank" class="keywords">MysqL</a>_error()); 
} 
else{ 
  if(!<a href="https://www.jb51.cc/tag/MysqL/" target="_blank" class="keywords">MysqL</a>_select_db(DBNAME,$con)){ 
    $dbn = DBNAME; 
    out("Could select database '$dbn' : " . <a href="https://www.jb51.cc/tag/MysqL/" target="_blank" class="keywords">MysqL</a>_error());
  } 
  $<a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a> = "set time_zone = '+8:00';"; 
  if(!db_onlyquery($<a href="https://www.jb51.cc/tag/sql/" target="_blank" class="keywords">sql</a>,$con)){ 
    out("select timezone fail!" . <a href="https://www.jb51.cc/tag/MysqL/" target="_blank" class="keywords">MysqL</a>_error()); 
  } 
} 
return $con;

}
function db_colseconnect($con){
MysqL_close($con);
}
function db_onlyquery($sql,$con){
$r = MysqL_query($sql,$con);
if(!$r){
out("query '$sql' :fail");
return false;
}
else{
return $r;
}
}
function db_query($sql){
$con = db_openconnect();
$r = db_onlyquery($sql,$con);
$res = false;
if($r){
$res = true;
}
db_colseconnect($con);
return $r;
}
function db_query_effect_rows($sql){
$con = db_openconnect();
$r = db_onlyquery($sql,$con);
$res = false;
if($r){
$res = MysqL_affected_rows($con);
if($res==0){
$res = -1;
}
}
else{
$res = false;
}
db_colseconnect($con);
return $res;
}
function db_getresult($sql){
$con = db_openconnect();
$r = db_onlyquery($sql,$con);
$res = false;
if($r && $arr = MysqL_fetch_row($r)){
$res = $arr[0];
}
db_colseconnect($con);
return $res;
}
function db_getarray($sql){
$con = db_openconnect();
$r = db_onlyquery($sql,$con);
$ret = false;
if($r){
$row = false;
$len = 0;
$ret = Array();
$i = 0;
while($arr = MysqL_fetch_row($r)){
if($row == false || $len==0){
$row = Array();
$len = count($arr);
for($i=0;$i<$len;++$i){
$key = MysqL_field_name($r,$i);
array_push($row,$key);
}
}
$itm = Array();
for($i=0;$i<$len;++$i){
$itm[$row[$i]]=$arr[$i];
}
array_push($ret,$itm);
}
}
db_colseconnect($con);
return $ret;
}
?>

其实上面的两个文件都是之前写好的，持久层的东西是下面的：

PHP;"> function SinORM_ExecSql($sql) {
return db_query($sql);
}
function SinORM_ExecArray($sql) {
return db_getarray($sql);
}
function SinORM_ExecResult($sql){
return db_getresult($sql);
}
function SinORM_GetClassPropertys($class) {
$r = new ReflectionClass($class);
if (!$r->hasProperty('tablename')) {
throw new Exception("Class '$class' has no [tablename] property");
}
$table = $r->getStaticPropertyValue('tablename');
if (!$r->hasProperty('id')) {
throw new Exception("Class '$class' has no [id] property");
}
$mpts = Array ();
$pts = $r->getProperties(ReflectionProperty :: IS_PUBLIC);
foreach ($pts as $pt) {
if (!$pt->isStatic()) {
array_push($mpts,$pt);
}
}
return Array (
$table,$mpts
);
}
function SinORM_GetPropertyString($pts,$class,$obj = false,$noid = false) {
if (is_null($pts)) {
list ($tb,$pts) = SinORM_GetClassPropertys($class);
}
$s = false;
$v = false;
$l = false;
foreach ($pts as $pt) {
$name = $pt->name;
if ($noid == false || $name != 'id') {
if ($l) {
$s = $s . ',';
}
$s = $s . $name;

    if ($obj) { 
      if ($l) { 
        $v = $v . ','; 
      } 
      $val = $pt->getValue($obj); 
      if (is_null($val)) 
        $v = $v . 'null'; 
      if (is_string($val)) 
        $v = $v . "'$val'"; 
      else 
        $v = $v . $val; 
    } 
    $l = true; 
  } 
} 
return Array ( 
  $s,$v 
);

}
function SinORM_GetTableName($class){
$r = new ReflectionClass($class);
if (!$r->hasProperty('tablename')) {
throw new Exception("Class '$class' has no [tablename] property");
}
$table = $r->getStaticPropertyValue('tablename');
if (!$r->hasProperty('id')) {
throw new Exception("Class '$class' has no [id] property");
}
return $table;
}
function SinORM_ResetORM($class) {
list ($tb,$pts) = SinORM_GetClassPropertys($class);
$sql = "CREATE TABLE $tb (id int NOT NULL AUTO_INCREMENT";
$r = new ReflectionClass($class);
$obj = $r->newInstance();
foreach ($pts as $pt) {
$val = $pt->getValue($obj);
$name = $pt->name;
if ($name != 'id') {
$sql = $sql . ',';
} else {
continue;
}
if (is_null($val))
throw new Exception($class . '->' . "name must have a default value");
if (is_string($val))
$sql = $sql . "$name text NULL";
else
$sql = $sql . "$name int NULL";
}
$sql = $sql . ",PRIMARY KEY (id));";
$dsql = "DROP TABLE IF EXISTS $tb;";
return SinORM_Execsql($dsql) && SinORM_Execsql($sql);
}
function SinORM_SaveObject($obj) {
$class = get_class($obj);
list ($tb,$pts) = SinORM_GetClassPropertys($class);
list ($names,$vals) = SinORM_GetPropertyString($pts,$obj,true);
$sql = "INSERT INTO $tb($names) values($vals)";
if(SinORM_Execsql($sql)){
$q = "SELECT id FROM $tb ORDER BY id DESC LIMIT 1;";
$id = SinORM_ExecResult($q);
if($id){
$obj->id = $id;
}
}
return false;
}
function SinORM_GetObjects($class) {
list ($tb,$pts) = SinORM_GetClassPropertys($class);
$sql = "SELECT from $tb;";
$ary = SinORM_ExecArray($sql);
$res = false;
if (is_array($ary)) {
$res = Array ();
$ref = new ReflectionClass($class);
foreach ($ary as $a) {
$obj = $ref->newInstance();
foreach ($pts as $pt) {
$name = $pt->name;
$olv = $pt->getValue($obj);
$val = $a[$name];
if (is_string($olv))
$pt->setValue($obj,$val);
else
$pt->setValue($obj,intval($val));
}
array_push($res,$obj);
}
} else {
echo 'no';
}
return $res;
}
function SinORM_GetObject($class,$id) {
list ($tb,$pts) = SinORM_GetClassPropertys($class);
$sql = "SELECT from $tb where id=$id;";
$ary = SinORM_ExecArray($sql);
$res = null;
if (is_array($ary) && count($ary) > 0) {
$res = Array ();
$ref = new ReflectionClass($class);
$a = $ary[0];
$obj = $ref->newInstance();
foreach ($pts as $pt) {
$name = $pt->name;
$olv = $pt->getValue($obj);
$val = $a[$name];
if (is_string($olv))
$pt->setValue($obj,$val);
else
$pt->setValue($obj,intval($val));
}
return $obj;
}
return null;
}
function SinORM_Update($obj) {
$class = get_class($obj);
list ($tb,$pts) = SinORM_GetClassPropertys($class);
$sql = "UPDATE $tb SET ";
$l = false;
foreach ($pts as $pt) {
$name = $pt->name;
$val = $pt->getValue($obj);
if ($name == 'id')
continue;
if ($l)
$sql = $sql . ',';
if (is_string($val))
$sql = $sql . "$name='$val'";
else
$sql = $sql . "$name=$val";
$l = true;
}
$sql = $sql . " WHERE id=$obj->id;";
return SinORM_Execsql($sql);
}
function SinORM_SaveOrUpdate($obj) {
if (SinORM_GetObject(get_class($obj),$obj->id) == null) {
SinORM_SaveObject($obj);
} else {
SinORM_Update($obj);
}
}
function SinORM_DeleteObject($obj){
$class = get_class($obj);
$tb = SinORM_GetTableName($class);
$sql = "DELETE FROM $tb WHERE id=$obj->id;";
return SinORM_Execsql($sql);
}
function SinORM_DeleteAll($class){
$tb = SinORM_GetTableName($class);
$sql = "DELETE FROM $tb;";
return SinORM_Execsql($sql);
}
?>

下面是使用的例子：

PHP;">

public $name = ''; // 姓名，必须初始化 
public $age = 0; // 年龄，必须初始化 
public $email = ''; // 必须初始化

}

// 注意：下面的语句一定要在定义好类之后运行一下，修改了类也需要运行一下，它完成创建表的工作
// SinORM_ResetORM('User'); // 这一句只是一开始执行一次，执行之后就会自动在数据库中建立User对应的表

$user1 = new User(); // 创建一个对象
$user1->name = 'TRB';
$user1->age = 22;
$user1->email = 'trbbadboy@qq.com';
SinORM_SaveObject($user1); // 把对象保存到数据库中

// 保存之后会自动给id的
$id = $user1->id;
echo $id . '
';

$user2 = SinORM_GetObject('User',$id); // 通过ID从数据库创建一个对象
echo $user2->name . '
';

$user1->name = 'trb'; // 改变一下
SinORM_Update($user1); // 更新到数据库

$user3 = SinORM_GetObject('User',$id); // 重新读出
echo $user3->name . '
';
?>

希望本文所述对大家的PHP程序设计有所帮助。

原文链接：https://www.f2er.com/php/21770.html

PHP基于MySQL数据库实现对象持久层的方法

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