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:
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<?php
/*
* Filename: config.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
*/
// About database
define( 'DBHOST' , 'localhost' ); // 数据库服务器
define( 'DBNAME' , 'db_wdid' ); // 数据库名称
define( 'DBUSER' , 'root' ); // 登陆用户名
define( 'DBPSWD' , 'trb' ); // 登录密码
?>
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下面是数据库访问的简单封装:
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<?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 (!mysql_set_charset( "utf8" , $con )){
out( "set mysql encoding fail" );
}
if (! $con ){
out( 'Could not connect: ' . mysql_error());
}
else {
if (!mysql_select_db(DBNAME, $con )){
$dbn = DBNAME;
out( "Could select database '$dbn' : " . mysql_error());
}
$sql = "set time_zone = '+8:00';" ;
if (!db_onlyquery( $sql , $con )){
out( "select timezone fail!" . mysql_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 ;
}
?>
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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:
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<?php
/*
* Filename: sinorm.php
* Created on 2012-11-4
* Created by RobinTang
* To change the template for this generated file go to
* Window - Preferences - PHPeclipse - PHP - Code Templates
*/
include_once ( "database.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 , $class , $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( $sql );
}
?>
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下面是使用的例子:
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<?php
/*
* Filename: demo.php
* Created on 2012-11-4
* Created by RobinTang
* To change the template for this generated file go to
* Window - Preferences - PHPeclipse - PHP - Code Templates
*/
include_once ( "sinorm.php" );
// 下面是一个持久对象的类的定义
// 每个持久对象类都必须有一个叫做$tablename静态成员,它表示数据库中存储对象的表名
// 类的每个成员都必须初始化,也就是必须给它一个初始值
// 成员变量只能为字符串或者整型,而且请定义成public的,只有public的成员变量会被映射
class User{
public static $tablename = 't_user' ; // 静态变量,对象的表名,必须的
public $id = 0; // 对象ID,对应表中的主键,必须的,而且必须初始化为0
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 . '<br/>' ;
$user2 = SinORM_GetObject( 'User' , $id ); // 通过ID从数据库创建一个对象
echo $user2 ->name . '<br/>' ;
$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 . '<br/>' ;
?>
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希望本文所述对大家的php程序设计有所帮助。