PHP利用匿名函数操作数据库的解决办法

这篇文章主要为大家详细介绍了PHP利用匿名函数操作数据库的简单示例，具有一定的参考价值，可以用来参考一下。

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代码如下:

Base dao class illustrating the usefulness of closures.

* Handles opening and closing of connections.

* Adds slashes sql

* Type checking of sql parameters and casts as appropriate

* Provides hook for processing of result set and emitting one or more objects.

* Provides hook for accessing underlying link and result objects.

<?php

define("userName","root");define("password","root");define("dbName","ahcdb");define("hostName","localhost");

class BaseDao {

function getConnection() { $link = mysql_connect(hostName, userName, password); if (!$link) die("Could not connect: " . mysql_error()); if (!mysql_select_db(dbName)) die("Could not select database: " . mysql_error()); return $link; } function setParams(& $sql, $params) { if($params != null) $sql = vsprintf($sql, array_map(function($n) { if(is_int($n)) return (int)$n; if(is_float($n)) return (float)$n; if(is_string($n)) return "'".mysql_real_escape_string($n)."'"; return mysql_real_escape_string($n); }, $params)); }

function executeQuery($sql, $params, $callback = null) { $link = $this->getConnection(); $this->setParams($sql, $params); $return = null; if(($result = mysql_query($sql, $link)) != null) if($callback != null) $return = $callback($result, $link); if($link != null) mysql_close($link); if(!$result) die("Fatal Error: Invalid query '$sql' : " . mysql_error()); return $return; } function getList($sql, $params, $callback) { return $this->executeQuery($sql, $params, function($result, $link) use ($callback) { $idx = 0; $list = array(); while ($row = mysql_fetch_assoc($result)) if($callback != null) $list[$idx] = $callback($idx++, $row); return $list; }); } function getSingle($sql, $params, $callback) { return $this->executeQuery($sql, $params, function($result, $link) use ($callback) { if ($row = mysql_fetch_assoc($result)) $obj = $callback($row); return $obj; }); }}

class Example { var $id; var $name; function Example($id, $name){ $this->id = $id; $this->name = $name; } function setId($id){ $this->id = $id; }}

class ExampleDao extends BaseDao { function getAll(){ return parent::getList("select * from nodes", null, function($idx, $row) { return new Example($row["id"], $row["name"]); }); } function load($id){ return parent::getSingle("select * from nodes where id = %1\$s", array($id), function($row) { return new Example($row["id"], $row["name"]); }); } function update($example){ return parent::executeQuery("update nodes set name = '' where id = -1", null, function($result, $link){ return $result; }); } function insert(& $example){ return parent::executeQuery("insert into nodes", null, function($result, $link) use ($example){ $id = mysql_insert_id($link); $example->setId($id); return $result; }); }}

$exampleDao = new ExampleDao();

$list = $exampleDao->getAll());

$exampleObject = $exampleDao->load(1));

$exampleDao->update($exampleObject);

?>

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