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Home Backend Development PHP Tutorial php mysqli 预处理 怎么绑定参数

php mysqli 预处理 怎么绑定参数

Jun 23, 2016 pm 02:04 PM

	/**	 * php中预处理执行sql	 * $sql[String]	sql语句	 * $args[array]	参数	 */	public function exeSql($sql,$args){		$mysqli_stmt=$mysqli->prepare($sql);		//由于$sql由调用者传入,所以sql语句和参数个数都不确定		//疑问1:怎么获取参数类型呢?php中有没有相应的函数呢?		//如果没有我用如下方法:getParamTypeStr($arr)是否可行呢?有什么好的建议吗?		//疑问2:怎么绑定参数呢?如下为参数个数确定时的绑定方法。		//$mysqli_stmt->bind_param("ssi","xx","xx",20);		$mysqli_stmt->execute();		$mysqli->close();	}   private function getParamTypeStr($arr){		$count = count($arr);		$typestr = "";		for($i = 0; $i<$count; $i++){			$type = gettype($arr[$i]);			switch($type){				case "integer":					$typestr.= "i";					break;				case "float":				case "double":					$typestr.= "d";					break;				case "string":					$typestr.= "s";					break;			}		}		return $typestr;	}
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我知道java中是通过如下方式实现的:
    //java中预处理执行sql	public void exeSql(String sql,Object[] args){		PreparedStatement preparedStatement = connection.prepareStatement(sql);        for(int i =0;i<args.length;i++){        	preparedStatement.setObject(i+1, args[i]);        }        preparedStatement.executeUpdate();        connection.close();	}
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哪位朋友帮忙解答下上面2点疑问,本人刚转php,看了文档,中有提及反射,不是很懂,也有朋友说通过替换sql中的'?',还望朋友详细指点,最好能提供点核心代码。非常感谢!


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2.

$callback = array($mysqli_stmt, 'bind_param');// 将参数类型描述加入数组array_unshift($args, getParamTypeStr($args)); call_user_func_array($callback, $args);// 它的调用类似:$mysqli_stmt->bind_param(getParamTypeStr($args), $args[0], $args[1], $args[2] ...);
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推荐你用PDO,mysqli的这个功能挺不好用的,PDO的bindParam()方法要直观的多
http://www.php.net/manual/en/pdostatement.bindparam.php

我这里有一个我自己写的PHP的PDO类,你可以直接用:

<?php/* 连接数据库类 MysqlConnect */class MysqlConnect{	private $dbhost=null;	private $dbuser=null;	private $dbpwd=null;	private $dbname=null;	private $dbport=null;	private $ifpdo=null;	private $dburi=null;	private $handler=null;	function __construct($dbhost,$dbuser,$dbpwd,$dbname,$dbport,$ifpdo,$dburi){		$this->dbhost=$dbhost;		$this->dbuser=$dbuser;		$this->dbpwd=$dbpwd;		$this->dbname=$dbname;		$this->dbport=$dbport;		$this->ifpdo=$ifpdo;		$this->dburi=$dburi;//PDO的URI参数,可以查手册		if($this->ifpdo==1){//表示调用PDO来操作数据库			$this->handler=$this->CreatePdo();		}elseif($this->ifpdo==0){//这里可以写MYSQLI的方法			$this->handler=null;		}	}	/* ----------------这里是入口--------------------- */	//@param sql:外部调用时传递的完整SQL语句	//@param bindArray:绑定的参数数组,与sql语句有关,如果没有PDO占位符此处为空	//@param action:传递操作参数,"select"/"update"/"delete"/"insert"	public function exeSql($sql,$bindArray=array(),$action=""){			$stmt=$this->handler->prepare($sql);			$stmt->execute($bindArray);			switch($action){				case "select":					return $stmt->fetch(PDO::FETCH_ASSOC);					break;				case "selectAll":					return $stmt->fetchAll(PDO::FETCH_ASSOC);					break;				case "update":				case "delete":					return $stmt->rowCount();					break;				case "insert":					return $this->handler->lastInsertId();					break;				case "count":					return $stmt->rowCount();				default:					return "";			}	}	public function query($sql){		return $this->handler->query($sql);	}	private function CreatePdo(){		try{			$handler=new PDO($this->dburi,$this->dbuser,$this->dbpwd);			$handler->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);			return $handler;		}catch(PDOException $e){			$e->getMessage();			$this->handler=null;		}	}	private function __get($args){		if($args=='handler'){			return $this->handler;		}	}}require(NEO_A_P.'\data\sqlconfig.php');//这里是sql的连接文件,下面创建对象的时候需要的变量就是这个文件里要有的$handler=new MysqlConnect($dbhost,$dbuser,$dbpwd,$dbname,$dbport,$ifpdo,$dburi);?>
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我这里有一个我自己写的PHP的PDO类,你可以直接用:

PHP code?123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778……

调用的时候,直接require包含这个类,然后$handler就是操作对象

谢谢楼上2位热心的朋友。

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