New operation of pdo in php

* PDO preprocessing mainly uses the PDOStatement object

* This object is created through: $pdo->prepare() method

* Both read and write operations can be done through: $pdoStmt- >execute() method

* In addition to using the ? symbol, placeholders in preprocessed SQL statements can also use named parameters, such as: name:email...

* The following is an example of adding new data for demonstration. It is divided into 6 steps:

* 1. Connect to the database and create a PDO object

* 2. Prepare preprocessed SQL statements and placeholders Use named parameter format:

* 3. Create PDO preprocessing object: instance of PDOStatement

* 4. Bind parameters to SQL statement object, preprocessing object

* 5. Perform new operations (in PDO, use execute() for reading and writing)

* 6. Destroy PDO objects (optional)

//1. Connect to the database and create PDO Object

$pdo = new PDO('mysql:dbname=php', 'root', 'root');

//2. Prepare the preprocessing SQL statement. The placeholder uses the named parameter format:

$sql = "INSERT `user` SET `user_name`=:name, `email`=:email,`password`=sha1(:password)";

//3. Create the PDO preprocessing object

$stmt = $pdo->prepare($sql);

/ /View the generated SQL statement, which can be copied to the SQL command window and run to ensure the correctness of the statement

echo $stmt->queryString;exit();

//4. Bind parameters to the preprocessing object

$data = ['name'=>'杨过','email'=>'yg@php.cn', 'password'=>'123'];
$stmt->bindParam(':name',$data['name'],PDO::PARAM_STR);
$stmt->bindParam(':email',$data['email'],PDO::PARAM_STR);
$stmt->bindParam(':password',$data['password'],PDO::PARAM_STR);

//5. Perform new operations

if($stmt->execute()){
    //rowCount():返回上一个SQL语句影响的行数
    echo &#39;<h3 id="成功添加了-stmt-rowCount-条记录">成功添加了&#39;.$stmt->rowCount().&#39;条记录</h3>&#39;;
} else {
    echo &#39;<h3 id="添加失败">添加失败</h3>&#39;;
    print_r($stmt->errorInfo());
    exit();
}

//6. Destroy PDO objects

$pdo = null;