PHP中使用匿名函数操作数据库的例子

这篇文章主要介绍了PHP中使用匿名函数操作数据库的例子,本文直接给出类的代码、使用例子、继承例子,需要的朋友可以参考下

复制代码 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.

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;
});
}
}