


PHP’s method of implementing the object persistence layer based on the MySQL database, mysql database
This article describes the example of PHP’s method of implementing the object persistence layer based on the MySQL database. Share it with everyone for your reference. The details are as follows:
On a whim, I made a simple persistence layer from PHP objects to the database.
I don’t often use PHP, and I am not familiar with PHP. Most of the content about PHP reflection is learned now.
Currently, the function is relatively weak. It only completes some simple tasks. The relationship between objects cannot be mapped, and the members of the object can only support two types: string or integer.
The values of member variables are not escaped. . .
Post the code below:
The first is the relevant definition of the database. This file defines the connection properties of the database:
<?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 ?>
The following is a simple encapsulation of database access:
<?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 $ret; } ?>
In fact, the two files above were written before, and the persistence layer is as follows:
<?php /* * Filename: sinorm.php * Created on 2012-11-4 * Created by RobinTang * To change the template for this generated file go to * Window - Preferences - PHPeclipse - PHP - Code Templates */ include_once("database.php"); function SinORM_ExecSql($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($sql); } ?>
The following is an example of usage:
<?php /* * Filename: demo.php * Created on 2012-11-4 * Created by RobinTang * To change the template for this generated file go to * Window - Preferences - PHPeclipse - PHP - Code Templates */ include_once("sinorm.php"); // 下面是一个持久对象的类的定义 // 每个持久对象类都必须有一个叫做$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/>'; ?>
I hope this article will be helpful to everyone’s PHP programming design.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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