/** * 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; }
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(); }
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!
回复讨论(解决方案)
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] ...);
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,$dburi);?>
我这里有一个我自己写的PHP的PDO类,你可以直接用:
PHP code?123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778……
调用的时候,直接require包含这个类,然后$handler就是操作对象
谢谢楼上2位热心的朋友。

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PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

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PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

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PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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